CN101667008B - Electronic timepiece and time difference correction method for an electronic timepiece - Google Patents

Electronic timepiece and time difference correction method for an electronic timepiece Download PDF

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Publication number
CN101667008B
CN101667008B CN2009101684962A CN200910168496A CN101667008B CN 101667008 B CN101667008 B CN 101667008B CN 2009101684962 A CN2009101684962 A CN 2009101684962A CN 200910168496 A CN200910168496 A CN 200910168496A CN 101667008 B CN101667008 B CN 101667008B
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time difference
satellite
information
zone
imaginary
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CN101667008A (en
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秋山利一
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Seiko Epson Corp
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Seiko Epson Corp
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Abstract

The present invention provides an electronic timepiece and a method of correcting time difference of the electronic timepiece. A GPS device (70) carries out position calculation based on satellite information obtained by satellite signals received by specific number of positioning information satellites selected in the captured position information, and generates positioning information. The base band part (60) calculates an assumed positioning region according to the position information, and judges whether the assumed positioning region comprises the time difference boundary or not according to the time difference information stored in a flash memory (66). And, under the condition that the assumed positioning region does not comprises the time difference boundary, a control part (40) corrects the internal time information based on the time difference in the assumed positioning region, and the GPS device (70) ends up the receiving action. The positioning calculation is continued when the time difference evaluation unit determines that the assumed positioning region contains a time difference boundary.

Description

The time difference correction method of electronic watch and electronic watch
In this application, the content that comprises Japanese patent application 2008-227058 that applied on September 4th, 2008 and the Japanese patent application 2008-249943 that applied on September 29th, 2008.
Technical field
The present invention relates to carry out the electronic watch of time difference correction and the time difference correction method of electronic watch according to satellite-signal from position information satellite transmissions such as gps satellites.
Background technology
Well-known has following GPS (Global Positioning System) system: send the electric wave of superposeed time information and orbit information around the moonlet (gps satellite) of the track in the earth sky, receiver (GPS receiver) on the ground receives this electric wave and self-position is carried out location.As one of GPS receiver, in recent years, developed from gps satellite and obtained the correct moment (GPS constantly) and current time is revised as the electronic watch in the correct moment.
GPS is the moment with respect to coordinated universal time (UTC) hysteresis UTC deviation (current is 14 seconds) constantly.Therefore, in utilizing the electronic watch of gps system, under the situation that shows local (constantly local) constantly, need add constantly obtained GPS and be revised as constantly locally with the time difference of UTC, need obtain information with time difference of UTC.
This electronic watch carries out location for the information that obtains this time difference to self-position.But, when the incoming level of electric wave is crossed when low, accurate demodulation orbit information, thereby can't carry out location calculating.Therefore, usually, only under the incoming level of the electric wave situation higher, carry out location and calculate than defined threshold.On the other hand, when location calculated the configuration difference of employed gps satellite, the error that location calculates was excessive, can't determine correct position.Therefore, usually, only in expression owing under the index of the deterioration of the location computational accuracy that the configuration of gps satellite the causes situation lower, carry out location calculating than defined threshold.Therefore, when fixing these threshold values,, promptly allow to carry out location and calculate and also can't carry out location and calculate under the incoming level situation lower or under the deterioration index calculated of the location situation higher than threshold value than threshold value.
Therefore, following method has been proposed: when initial location calculates, these threshold settings are got higherly, can't carry out under the situation that location calculates, slowly cushion these threshold values, thus, can improve and carry out the possibility that location calculates, improve the location computational accuracy simultaneously as much as possible.
But in the method that TOHKEMY 2006-138682 communique is put down in writing, in order to keep high as far as possible location computational accuracy, location calculates convergence sometimes needs the time.When location calculates spended time, consume electric power and increase, therefore, in this electronic watch of battery-driven wrist-watch, be difficult to use this method.
Summary of the invention
The electronic watch of the present invention's the 1st mode has the function of reception from the satellite-signal of positional information satellite transmission, this electronic watch is characterised in that, this electronic watch comprises: acceptance division, and it receives described satellite-signal, obtains satellite information from the described satellite-signal that is received; The satellite search part, it carries out following processing: retrieve the described positional information satellite that can catch according to the described satellite-signal that is received, and catch the described positional information satellite that retrieves; The location calculating part, it selects the described positional information satellite of stated number from the described positional information satellite that described satellite search part is caught, calculate according to carry out location at the described satellite information that from the described satellite-signal of selected described positional information satellite transmission, comprises, generate positional information; Time information modification portion, it revises inner time information according to described satellite information; The time information display part, it shows described inner time information; Storage part, its storage defines the time difference information that obtains to each time difference in a plurality of zones, and described a plurality of zones are cut apart geography information and are obtained; And time difference detection unit, it is according to described positional information calculation imaginary positions zone, judge according to described time difference information whether described imaginary positions zone comprises time difference boundary, do not comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, described inner time information is revised according to the time difference in described imaginary positions zone by described time information modification portion, comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, described location calculating part is reselected the described positional information satellite of described stated number, proceeding described location calculates, do not comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, described acceptance division finishes the reception of described satellite-signal.
In the time difference correction method of the electronic watch of the present invention's the 2nd mode, this electronic watch has: acceptance division, and it receives the satellite-signal from the positional information satellite transmission, obtains satellite information from the described satellite-signal that is received; Display part, it shows inner time information; And storage part, its storage defines the time difference information that obtains to each time difference in a plurality of zones, described a plurality of zone is cut apart geography information and is obtained, the time difference correction method of this electronic watch is characterised in that the time difference correction method of this electronic watch comprises: the step that obtains described satellite information by described acceptance division; The satellite searching step carries out following processing: retrieve the described positional information satellite that can catch according to the described satellite-signal that is received, and catch the described positional information satellite that retrieves; The location calculation procedure, from the described positional information satellite of described satellite searching step, catching, select the described positional information satellite of stated number, calculate according to carry out location at the described satellite information that from the described satellite-signal of selected described positional information satellite transmission, comprises, generate positional information; Step according to described positional information calculation imaginary positions zone; Time difference determination step judges according to described time difference information whether described imaginary positions zone comprises time difference boundary; And the step of carrying out following processing: do not comprise under the situation of time difference boundary being judged to be described imaginary positions zone, revise described inner time information according to the time difference in described imaginary positions zone, described acceptance division finishes the reception of described satellite-signal, in described location calculation procedure, comprise under the situation of time difference boundary being judged to be described imaginary positions zone, reselect the described positional information satellite of described stated number, proceed described location and calculate.
Description of drawings
Fig. 1 is the figure that is used to illustrate the summary of gps system.
Fig. 2 A～Fig. 2 C is the figure that is used to illustrate the structure of navigation message.
Fig. 3 A and Fig. 3 B are the figure of structure of wrist-watch that is used to illustrate the band GPS of the 1st embodiment.
Fig. 4 is the figure of circuit structure of wrist-watch that is used to illustrate the band GPS of present embodiment.
Fig. 5 is the figure of the structure of the control part that is used to illustrate present embodiment, base band part.
Fig. 6 is the process flow diagram of an example that the time difference correction treatment step of the 1st embodiment is shown.
Fig. 7 is the figure of an example that is used to illustrate the time difference correction treatment step of the 1st embodiment.
Fig. 8 A, Fig. 8 B are the figure of an example that is used to illustrate the time difference correction treatment step of the 1st embodiment.
Fig. 9 is the figure of an example that the geography information of the 2nd embodiment is shown.
Figure 10 is the figure of an example that the time difference information of the 2nd embodiment is shown.
Figure 11 is the figure of an example that the time difference information of the 2nd embodiment is shown.
Figure 12 is illustrated in to judge in the 2nd embodiment whether the imaginary positions zone comprises the process flow diagram of the treatment step of time difference boundary.
Figure 13 is used for illustrating that the 2nd embodiment obtains the figure of an example of treatment step of the time difference in imaginary positions zone.
Figure 14 A, Figure 14 B are used for illustrating that the 2nd embodiment obtains the figure of an example of treatment step of the time difference in imaginary positions zone.
Figure 15 is the process flow diagram of an example that the time difference correction treatment step of the 3rd embodiment is shown.
Figure 16 is the skeleton diagram of appearance of wrist-watch that the band GPS of the 3rd embodiment is shown.
Figure 17 is the process flow diagram of an example that the time difference correction treatment step of the 4th embodiment is shown.
Figure 18 is the process flow diagram of an example that the time difference correction treatment step of the 5th embodiment is shown.
Embodiment
The present invention can provide the following electronic watch and the time difference correction method of electronic watch: optimize consumption electric power and with the MIN consumption electric power of necessity, carry out time difference correction according to the satellite-signal from the positional information satellite transmission.
(1) an embodiment of the invention are a kind of electronic watches, this electronic watch has the function of reception from the satellite-signal of positional information satellite transmission, this electronic watch is characterised in that, this electronic watch comprises: acceptance division, it receives described satellite-signal, obtains satellite information from the described satellite-signal that is received; The satellite search part, it carries out following processing: retrieve the described positional information satellite that can catch according to the described satellite-signal that is received, and catch the described positional information satellite that retrieves; The location calculating part, it selects the described positional information satellite of stated number from the described positional information satellite that described satellite search part is caught, calculate according to carry out location at the described satellite information that from the described satellite-signal of selected described positional information satellite transmission, comprises, generate positional information; Time information modification portion, it revises inner time information according to described satellite information; The time information display part, it shows described inner time information; Storage part, its storage defines the time difference information that obtains to each time difference in a plurality of zones, and described a plurality of zones are cut apart geography information and are obtained; And time difference detection unit, it is according to described positional information calculation imaginary positions zone, judge according to described time difference information whether described imaginary positions zone comprises time difference boundary, do not comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, described inner time information is revised according to the time difference in described imaginary positions zone by described time information modification portion, comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, described location calculating part is reselected the described positional information satellite of described stated number, proceeding described location calculates, do not comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, described acceptance division finishes the reception of described satellite-signal.
Satellite information is the time information possessed of positional information satellite and orbit information of positional information satellite etc.
Inner time information is the information in the moment of the internal clocking of electronic watch.
The imaginary positions zone is the zone that electronic watch may exist.For example, can be the center with the position shown in the positional information (for example latitude and longitude) of the electronic watch that obtains with the location result calculated, the error calculated with location is that the interior zone of circle of radius is as the imaginary positions zone.
In the electronic watch of present embodiment,, can guarantee that then electronic watch must be positioned at the arbitrary site in the zone of the same time difference if the imaginary positions zone that is calculated does not comprise time difference boundary.Therefore, whether the judgment standard that can time adjustment (time difference correction) processing not finished is set on the precision of location calculating, comprise on the time difference boundary but be set in the imaginary positions zone.
For example, cause the imaginary positions zone that calculated quite big (for example radius is the interior zone of the circle of hundreds of km) even the precision of calculating owing to location is low, under the imaginary positions zone all is included in situation in China or the marine this extremely broad same time difference zone, also can obtains the time difference and carry out time adjustment.That is,, can't determine under the situation of correct position,, finish to receive action, also can carry out time adjustment according to the position of electronic watch even the precision of calculating at location is low according to the present invention.Therefore, according to electronic watch of the present invention, can optimize location and calculate needed consumption electric power and revise (time difference correction) finish time with as far as possible little consumption electric power.
And, in the electronic watch of present embodiment, comprise under the situation of time difference boundary in the imaginary positions zone that is calculated, reselect the positional information satellite, proceed location and calculate.Therefore, can improve the precision that location calculates, so calculating does not comprise the little imaginary positions zone of time difference boundary easily.Therefore,, also determine the time difference easily, can optimize location and calculate needed consumption electric power and revise (time difference correction) finish time with as far as possible little consumption electric power even be positioned under the situation of comparison near the place of time difference boundary at electronic watch.
(2) in above-mentioned electronic watch, described satellite search part is proceeded the processing of the described positional information satellite that can catch of retrieving novel, till the described positional information satellite that captures the maximum number that to catch, when capturing the described positional information satellite of the maximum number that can catch, comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, stop the seizure of at least one described positional information satellite, carry out the processing of the described positional information satellite that can catch of retrieving novel.
Carrying out the location result calculated in the combination that utilizes at least one positional information satellite is to be judged to be the imaginary positions zone to comprise under the situation of time difference boundary, seizure that also can stop position information satellite.And, be to be judged to be the imaginary positions zone that calculates according to whole result of calculations to comprise under the situation of time difference boundary utilizing all combinations to carry out the location result calculated, also can stop the seizure of at least one described positional information satellite.Promptly, can not comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit yet, described location calculating part carries out described location according to the combination of whole described satellite informations and calculates, comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, described satellite search part is according to whole described location result calculated, stop the seizure of at least one described positional information satellite, carry out the processing of the described positional information satellite that can catch of retrieving novel.The described positional information satellite of the object that stops as seizure is preferably the described positional information satellite that becomes the main cause that makes the deterioration of location precision that described location calculates.
In the electronic watch of present embodiment, when capturing the described positional information satellite of the maximum number that can catch, comprise under the situation of time difference boundary in the imaginary positions zone that is calculated, replace at least one positional information satellite, use the satellite information of the positional information satellite that newly captures to carry out location calculating.Therefore, can improve the precision that location calculates, so calculating does not comprise the little imaginary positions zone of time difference boundary easily.Therefore, in the electronic watch of present embodiment, even be positioned under the situation of comparison near the place of time difference boundary, also determine the time difference easily, can optimize location and calculate needed consumption electric power and revise (time difference correction) finish time with as far as possible little consumption electric power.
(3) in above-mentioned electronic watch,, be judged to be described imaginary positions zone by described time difference detection unit and do not comprising in the absence of time difference boundary before the time through predetermined restricted, described acceptance division finishes the reception of described satellite-signal.
(4) in above-mentioned electronic watch, described location calculating part calculates described error of position information according to the DOP value, and described time difference detection unit calculates described imaginary positions zone according to described error.
For example, value after will multiplying each other to the sum of errors DOP value of the positional information satellite that calculates in location calculates and the distance between the electronic watch is as the location error, will be the center with the position shown in the positional information, be that the interior zone of the circle of radius calculates as the imaginary positions zone with the error of location calculating.
(5) in above-mentioned electronic watch, this electronic watch comprises the positional information display part that shows described positional information, do not comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, described positional information display part upgrades the demonstration of described positional information.
(6) in above-mentioned electronic watch, described time difference information comprises to be used for determining comprising cuts apart the information of position of imaginary area that a plurality of described zone that obtains has defined a plurality of described zones of the different time differences to described geography information, described time difference detection unit judges according to described time difference information whether described imaginary positions zone comprises at least a portion of described imaginary area, comprise under the situation of described imaginary area in described imaginary positions zone, according to the position in the described zone that described imaginary area comprised, judge whether described imaginary positions zone comprises time difference boundary.
According to present embodiment, judge whether the imaginary positions zone calculated comprises part or all of imaginary area, under situation about comprising, judge with reference to the position of the interior zone of this imaginary area to have or not time difference boundary.Therefore, if the regions that a plurality of little time difference zones are intensive are as imaginary area, then do not comprise under the situation of imaginary area, do not need to judge separately whether the imaginary positions zone comprises part or all of these a plurality of little time difference zones in the imaginary positions zone that is calculated.Therefore, according to present embodiment, can optimize the time whether the imaginary positions zone comprises the determination processing of time difference boundary.
And, according to present embodiment, comprise under the situation of imaginary area in the imaginary positions zone that is calculated, judge according to the position in a plurality of zones that imaginary area comprised whether the imaginary positions zone comprises time difference boundary, so, can guarantee the high precision of judging.
(7) in above-mentioned electronic watch, described zone is classified as the zone of the 1st layer～N (N 〉=2) layer, described time difference information comprises the time difference information of the 1st layer～N layer of the time difference in the described zone that has defined the 1st layer～N layer respectively, (the described imaginary area in the described time difference information of the layer of 1≤k＜N) comprises the following described zone of k+1 layer to k, described time difference detection unit judges according to the described time difference information of k layer whether described imaginary positions zone comprises at least a portion of described imaginary area, comprise in described imaginary positions zone under the situation of at least a portion of described imaginary area, judge according to the described time difference information of k+1 layer whether described imaginary positions zone comprises at least a portion of described imaginary area.
According to present embodiment, at first,, judge whether the imaginary positions zone comprises part or all of the 1st layer imaginary area (having defined the imaginary area of the information that is used for definite its position in the 1st layer time difference information) with reference to the 1st layer time difference information.Comprise in the imaginary positions zone under the 1st layer part or all the situation of imaginary area, then, with reference to the 2nd layer time difference information, judge whether the imaginary positions zone comprises part or all of the 2nd layer imaginary area (having defined the imaginary area of the information that is used for definite its position in the 2nd layer time difference information).Equally, comprise in the imaginary positions zone under part or all the situation of imaginary area of k layer, with reference to the time difference information of k+1 layer, judge whether the imaginary positions zone comprises part or all of the imaginary area of k+1 layer (having defined the imaginary area of the information that is used for definite its position in the time difference information of k+1 layer).Then, do not comprise in the imaginary positions zone under part or all the situation of imaginary area of k layer,, judge whether the imaginary positions zone comprises time difference boundary according to the position in the zone of the time difference that has defined the k layer.That is, according to present embodiment, can be successively with reference to according to the size in the zone that has defined the time difference and the suitable time difference information of stratification, carry out determination processing simultaneously, so, can optimize time of determination processing.
(8) in above-mentioned electronic watch, described zone and described imaginary area are divided into rectangular shape.
According to present embodiment, defined the rectangular shape that is shaped as of the zone of the time difference and imaginary area, so in order to determine the zone, only cornerwise 2 point coordinate data of storage rectangle get final product.Therefore, compare, can significantly cut down the data volume of time difference information with careful each data conditions of cutting apart the short lines of time difference boundary line of storage.
And according to present embodiment, under the situation of the size of the rectangular shape of this zone that time difference information comprised of having fixed each layer and imaginary area, coordinate data is only stored at 1 and is got final product, so, the data volume that can further cut down time difference information.
And then according to present embodiment, each zone is a rectangular shape, so whether the imaginary positions zone that can carry out being calculated very simply comprises the determination processing of time difference boundary.
(9) an embodiment of the invention are time difference correction methods of a kind of electronic watch, and this electronic watch has: acceptance division, and it receives the satellite-signal from the positional information satellite transmission, obtains satellite information from the described satellite-signal that is received; Display part, it shows inner time information; And storage part, its storage defines the time difference information that obtains to each time difference in a plurality of zones, described a plurality of zone is cut apart geography information and is obtained, the time difference correction method of this electronic watch is characterised in that the time difference correction method of this electronic watch comprises: the step that obtains described satellite information by described acceptance division; The satellite searching step carries out following processing: retrieve the described positional information satellite that can catch according to the described satellite-signal that is received, and catch the described positional information satellite that retrieves; The location calculation procedure, from the described positional information satellite of described satellite searching step, catching, select the described positional information satellite of stated number, calculate according to carry out location at the described satellite information that from the described satellite-signal of selected described positional information satellite transmission, comprises, generate positional information; Step according to described positional information calculation imaginary positions zone; Time difference determination step judges according to described time difference information whether described imaginary positions zone comprises time difference boundary; And the step of carrying out following processing: do not comprise under the situation of time difference boundary being judged to be described imaginary positions zone, revise described inner time information according to the time difference in described imaginary positions zone, described acceptance division finishes the reception of described satellite-signal, in described location calculation procedure, comprise under the situation of time difference boundary being judged to be described imaginary positions zone, reselect the described positional information satellite of described stated number, proceed described location and calculate.
Below, use accompanying drawing to describe preferred implementation of the present invention in detail.In addition, below the embodiment of explanation does not limit the content of the present invention that the claim scope is put down in writing undeservedly.And below Shuo Ming structure is not necessary structure important document of the present invention entirely.
1.GPS system
1-1. summary
Fig. 1 is the figure that is used to illustrate the summary of gps system.
On the empty on earth regulation track of gps satellite 10 around, stack navigation message and transmission earthward in the electric wave (L1 ripple) of 1.57542GHz.Here, gps satellite 10 is examples of the positional information satellite of an embodiment of the invention, and the electric wave (hereinafter referred to as " satellite-signal ") that is superimposed with the 1.57542GHz of navigation message is an example of the satellite-signal of an embodiment of the invention.
At present, there are about 30 gps satellites 10, sent satellite-signal in order to discern, in satellite-signal, the superpose natural mode of the 1023chip (1ms cycle) that is called as C/A sign indicating number (Coarse/Acquisition Code) of each gps satellite 10 from which gps satellite 10.The C/A sign indicating number can be considered as the either party's of each chip+1 or-1 random pattern.Therefore, the degree of correlation of the pattern by getting satellite-signal and each C/A sign indicating number can detect the C/A sign indicating number that is superimposed upon in the satellite-signal.
Gps satellite 10 has carried the atom clock and watch, comprises the extremely correct time information (hereinafter referred to as " GPS time information ") that utilizes the timing of atom clock and watch in satellite-signal.And, measure the small moment error of the atom clock and watch of lift-launch in each gps satellite 10 by the control section on ground, in satellite-signal, also comprise the time correction parameter that is used to proofread and correct this moment error.Therefore, GPS receiver 1 receives the satellite-signal that sends from a gps satellite 10, uses the GPS time information and the time correction parameter that are wherein comprised, can be the correct moment with inner time adjustment.
The orbit information that in satellite-signal, also comprises expression gps satellite 10 position in orbit.GPS receiver 1 uses GPS time information and orbit information, can carry out location and calculate.The error that comprises constantly to a certain degree with the inside of GPS receiver 1 is a prerequisite, carries out location and calculates.That is, except x, the y of the three-dimensional position that is used for determining GPS receiver 1, z parameter, error also is a unknown number constantly.Therefore, the GPS receiver 1 general satellite-signal that sends from the gps satellite more than 4 respectively that receives uses the GPS time information and the orbit information that are wherein comprised, carries out location and calculates.
The precision that location calculates is different owing to the geometric configuration of gps satellite 10 and GPS receiver 1.Therefore, general use be called as DOP (Dilution Of Precision), expression is because the index of the degree of the precision deterioration of the location calculating that the configuration of gps satellite 10 causes.That is, distance accuracy (the Determination of distance precision between gps satellite 10 and the GPS receiver 1) be multiply by the DOP value, estimate the precision that location calculates, the DOP value is more little, and the precision that location calculates is high more.In addition, exist in DOP: the overall target of position and decision precision constantly is that the index of the decision precision of GDOP (Geometric DOP), position is that the index of decision precision of the position of PDOP (Positional DOP), horizontal direction is that the index of decision precision of the position of HDOP (Horizontal DOP), vertical direction is that the index of VDOP (Vertical DOP), decision precision constantly is TDOP (Time DOP) etc.
1-2. navigation message
Fig. 2 A～Fig. 2 C is the figure that is used to illustrate the structure of navigation message.
Shown in Fig. 2 A, the prime frame that navigation message constitutes with whole bit number 1500 bits is the data of 1 unit.Prime frame is split into 5 subframes 1～5 that are respectively 300 bits.1 sub-frame data sent from each gps satellite 10 with 6 seconds.Therefore, 1 prime frame data sent from each gps satellite 10 with 30 seconds.
In subframe 1, comprise satellite correction datas such as week number data.The week number data are the information that expression comprises the week of current GPS time information.The starting point of GPS time information is the 00:00:00 in 6 days January in 1980 among the UTC (coordinated universal time), and the week number in the week of this day beginning is 0.The week number data are upgraded with 1 all units.
In subframe 2,3, comprise ephemeris parameter (the detailed orbit information of each gps satellite 10).And, in subframe 4,5, comprise year calendar parameter (the summary orbit informations of all gps satellites 10).
And then, in subframe 1～5, from the HOW word of HOW (handover word) data of initial TLM (Telemetry) word that includes TLM (Telemetry word) data of having stored 30 bits and 30 bits.
Therefore, TLM word and HOW word sent from gps satellite 10 at interval with 6 seconds, and be relative therewith, and satellite correction datas such as week number data, ephemeris parameter, year calendar parameter sent at interval with 30 seconds.
Shown in Fig. 2 B, in the TLM word, comprise header data, TLM message, Reserved bit, odd and even data.
Shown in Fig. 2 C, in the HOW word, comprise the such time information of TOW (Time of week is also referred to as " Z counting ").The Z enumeration data is with showing that be returned as 0 in next week from 0 elapsed time of lighting on Sun. weekly second at 0 of Sun..That is, the Z enumeration data is the information according to represented second unit of each week since a week, is the number with 1.5 seconds unit representation elapsed time.Here, the Z enumeration data represents to send the time information of the initial bits of next son frame data.For example, the Z enumeration data of subframe 1 represents to send the time information of the initial bits of subframe 2.And, in the HOW word, also comprise the data (ID sign indicating number) of 3 bits of expression subframe ID.That is, in the HOW of the subframe shown in Fig. 2 A 1～5 word, comprise the ID sign indicating number of " 001 ", " 010 ", " 011 ", " 100 ", " 101 " respectively.
GPS receiver 1 is obtained the HOW word (Z enumeration data) that week number data that subframe 1 comprised and subframe 1～5 are comprised, and thus, can obtain the GPS time information.Wherein, under the situation that obtains the week number data before the GPS receiver 1 and the elapsed time of rising the period of having obtained the week number data is counted in inside,, also can access the present week number data of gps satellite even do not obtain the week number data.Therefore, as long as GPS receiver 1 is obtained the Z enumeration data, just can estimate present GPS time information.Therefore, GPS receiver 1 is only obtained the Z enumeration data usually as time information.
In addition, TLM word, HOW word (Z enumeration data), satellite correction data, ephemeris parameter, year calendar parameter etc. are examples of the satellite information of an embodiment of the invention.
As GPS receiver 1, for example can consider wrist-watch (hereinafter referred to as " wrist-watch of band GPS ") with the GPS device.The wrist-watch of band GPS is an example of the electronic watch of an embodiment of the invention, the following describes the wrist-watch of the band GPS of present embodiment.
2. be with the wrist-watch of GPS
2-1. the 1st embodiment
[structure of the wrist-watch of band GPS]
Fig. 3 A and Fig. 3 B are the figure of structure of wrist-watch that is used to illustrate the band GPS of present embodiment.Fig. 3 A is the general view of wrist-watch of band GPS, and Fig. 3 B is the summary section of wrist-watch of the band GPS of Fig. 3 A.
As shown in Figure 3A, the wrist-watch 1 of band GPS has dial plate 11 and pointer 12.On the peristome of a part that is formed at dial plate 11, be assembled with display 13.Display 13 shows the information and the various informations such as city title of current longitude and latitude, locality by formations such as LCD (LiquidCrystal Display) display panels.Pointer 12 is made of second hand, minute hand, hour hands etc., drives by stepping motor via gear.
Dial plate 11 and pointer 12 are as the time information display part performance function of an embodiment of the invention.And display 13 is as the positional information display part performance function of an embodiment of the invention.
The wrist-watch 1 of band GPS constitutes and can be set at following two patterns: receives from the satellite-signal of at least 1 gps satellite 10 by manual operation table hat 14 and button 15,16 and carry out the pattern (pattern during survey) of the modification of inner time information and receive satellite-signal from a plurality of gps satellites 10 carrying out location calculating and revising the pattern (location pattern) of the time difference of inner time information.And the wrist-watch 1 of band GPS regularly (automatically) is carried out pattern and location pattern when surveying.
Shown in Fig. 3 B, the wrist-watch 1 of band GPS has the shell 17 by the metal formation of stainless steel (SUS), titanium etc.
Shell 17 forms roughly cylindric, via table circle (bezel) 18 watch crystal 19 is installed at the opening of face side.And, at the opening of the rear side of shell 17 back of the body is installed and covers 26.The back of the body covers 26 and forms ring-type by metal, and opening is equipped with back side glass 23 in the central.
In the internal configurations of shell 17 stepping motor that drives pointer 12, gps antenna 27, battery 24 etc. are arranged.
Stepping motor is made of motor winding 20, stator, rotor etc., via gear drive pointer 12.
Gps antenna 27 is the antennas that receive from the satellite-signal of a plurality of gps satellites 10, by realizations such as paster antenna, helical antenna, antenna components.Gps antenna 27 is configured in the face (rear side) of opposition side of the moment display surface of dial plate 11, receives the satellite-signal that has passed through watch crystal 19 and dial plate 11.Therefore, the material, for example plastics that are passed through by the electric wave that makes the 1.5GHz frequency band of dial plate 11 and watch crystal 19 constitute.And in order to improve the receptivity of satellite-signal, table circle 18 is made of pottery etc.
Dispose circuit substrate 25 in the back of the body of gps antenna 27 lid side, dispose battery 24 in the back of the body lid side of circuit substrate 25.
On circuit substrate 25, be equipped with the reception that comprises the receiving circuit that the satellite-signal that is received by gps antenna 27 is handled with IC 30, carry out the control usefulness IC 40 etc. of the drive controlling etc. of stepping motor.Receive with IC 30 and control and drive by the electric power that provides from battery 24 with IC 40.
Battery 24 is chargeable secondary cells of lithium ion battery etc., disposes magnetic piece 21 at the downside (back of the body covers side) of battery 24.Dispose charging coil 22 across magnetic piece 21, battery 24 can utilize electromagnetic induction to charge from external charger.
And magnetic piece 21 can make magnetic field circuitous.Therefore, magnetic piece 21 can reduce the influence of battery 24 and carry out energy effectively and transmit.Pass in order to carry out electric power, cover 26 central portion at the back of the body and dispose back side glass 23.
In addition, in the present embodiment,, use the secondary cell of lithium ion battery etc., still, also can use the one-shot battery of lithium battery etc. as battery 24.And, charging method when secondary cell is set, be not limited to present embodiment and charging is set like that utilizes way of electromagnetic induction to charge, for example, also can be with power facilities such as solar cell is set on the wrist-watch 1 of GPS to charge from external charger with coil 22.
[circuit structure of the wrist-watch of band GPS]
Fig. 4 is the figure of circuit structure of wrist-watch that is used to illustrate the band GPS of present embodiment.
The wrist-watch 1 of band GPS constitutes and comprises GPS device 70 and display device 80.GPS device 70 comprises acceptance division, satellite search part, location calculating part, time difference detection unit, the storage part of an embodiment of the invention, and retrieval and seizure, the location that carries out the obtaining of the reception of satellite-signal and satellite information, gps satellite 10 calculates, the calculating in imaginary positions zone and the processing of the judgement of time difference boundary, the storage of time difference information etc.Display device 80 comprises the time information modification portion and the time information display part of an embodiment of the invention, carries out the processing of the modification of inner time information and the demonstration of inner time information etc.
Charging is charged by 28 pairs of batteries 24 of charging control circuit with coil 22.Battery 24 provides driving electric via regulator 29 to GPS device 70 and display device 80 etc.
[structure of GPS device]
GPS device 70 comprises gps antenna 27 and SAW, and (Surface Acoustic Wave: surface acoustic wave) wave filter 31.As illustrating among Fig. 3 B, gps antenna 27 is the antennas that receive from the satellite-signal of a plurality of gps satellites 10.Wherein, gps antenna 27 also receives the unwanted electric wave beyond some satellite-signals, so SAW wave filter 31 carries out the processing of extraction satellite-signal from the signal that gps antenna 27 receives.That is, SAW wave filter 31 constitutes the bandpass filter that the signal that makes the 1.5GHz frequency band passes through.
And GPS device 70 comprises to receive uses IC (receiving circuit) 30.Receiving circuit 30 constitutes and comprises RF (Radio Frequency: wireless frequency) portion 50 and base band part 60.As described below, receiving circuit 30 carries out following processing: the satellite-signal of the 1.5GHz frequency band that is extracted from SAW wave filter 31, obtain the satellite information of orbit information that navigation message comprises and GPS time information etc.
RF portion 50 constitutes and comprises: LNA (Low Noise Amplifier) 51, frequency mixer 52, VCO (Voltage Controlled Oscillator) 53, PLL (Phase Locked Loop) circuit 54, IF amplifier 55, IF (Intermediate Frequency: intermediate frequency) wave filter 56, ADC (A/D converter) 57 etc.
The satellite-signal that SAW wave filter 31 is extracted utilizes LNA 51 to amplify.The satellite-signal that utilizes LNA 51 to amplify utilizes frequency mixer 52 to mix with the clock signal of VCO 53 outputs, and frequency reducing is the signal of intermediate frequency band.54 pairs in PLL circuit carries out bit comparison mutually with the clock signal behind the clock signal frequency division of VCO 53 with reference clock signal, makes the clock signal of VCO 53 and reference clock signal synchronous.Its result, VCO 53 can the output reference clock signal the stable clock signal of frequency accuracy.In addition, as intermediate frequency, for example can select several MHz.
The signal that utilizes frequency mixer 52 to mix utilizes IF amplifier 55 to amplify.Here, by the mixing of frequency mixer 52, generate the signal of intermediate frequency band and the high-frequency signal of several GHz.Therefore, the signal of 55 pairs of middle frequency bands of IF amplifier and the high-frequency signal of several GHz amplify.IF wave filter 56 passes through the signal of intermediate frequency band, and removes the high-frequency signal (saying that correctly the level that decays to regulation is following) of these several GHz.The signal of the intermediate frequency band by IF wave filter 56 utilizes ADC (A/D converter) 57 to be converted to digital signal.
Base band part 60 constitutes and comprises: DSP (Digital Signal Processor) 61, CPU (CentralProcessing Unit) 62, SRAM (Static Random Access Memory) 63, RTC (real-time clock) 64.And, on base band part 60, be connected with band crystal oscillation circuit (TCXO:Temperature Compensated Crystal Oscillator) 65 of temperature-compensation circuit and flash memory 66 etc.
The crystal oscillation circuit (TCXO) 65 of band temperature-compensation circuit generates the roughly reference clock signal of certain frequency temperature independently.
In flash memory 66, store time difference information.Time difference information is to have defined the information of geography information being cut apart each time difference in a plurality of zones that obtain.That is, flash memory 66 is as the storage part performance function of an embodiment of the invention.
When being set at when surveying pattern or location pattern, base band part 60 is carried out the processing according to digital signal (signal of the intermediate frequency band) demodulated base band signal of ADC 57 conversions of RF portion 50.
And when being set at when surveying pattern or location pattern, base band part 60 is carried out following processing in satellite searching step described later: produce the local code with each C/A sign indicating number model identical, obtain each the C/A sign indicating number that baseband signal comprises and the degree of correlation of local code.Then, the generation that base band part 60 is adjusted local codes is regularly so that be peak value at the correlation of each local code, under correlation is situation more than the threshold value, is judged as the gps satellite 10 synchronous (promptly having caught gps satellite 10) with this local code.That is, base band part 60 is as the satellite search part performance function of an embodiment of the invention.Here, in gps system, adopt all gps satellites 10 to use different C/A sign indicating numbers to send CDMA (the Code Division Multiple Access) mode of the satellite-signal of same frequency.Therefore, by differentiating the C/A sign indicating number that satellite-signal comprised that is received, can retrieve the gps satellite 10 that to catch.
And base band part 60 is carried out following processing in pattern or the location pattern when surveying: the satellite information of the gps satellite 10 of catching in order to obtain, and to mixing with the local code and the baseband signal of the C/A sign indicating number model identical of this gps satellite 10.In mixed signal, the satellite information of the gps satellite 10 of catching comprising carries out demodulation in interior navigation message.And, base band part 60 is carried out following processing in pattern or the location pattern when surveying: detect the TLM word (header data) of each subframe of navigation message, obtain the satellite information (for example being stored among the SRAM 63) of orbit information that each subframe comprises and GPS time information etc.
And, when being set at the location pattern, base band part 60 is carried out location calculating according to GPS time information and orbit information, obtain positional information (more specifically, the latitude and the longitude in the wrist-watch 1 residing place of band GPS when receiving) and location error (more specifically, for the wrist-watch 1 actual residing place of band GPS with by the ultimate range in the definite place of positional information).That is, base band part 60 is as the location calculating part performance function of an embodiment of the invention.
And then when being set at the location pattern, base band part 60 is carried out following processing: according to positional information and the location error that location calculates, and the zone (imaginary positions zone) that the wrist-watch 1 of calculating band GPS may exist.Then, base band part 60 judges with reference to the time difference information that is stored in the flash memory 66 whether the imaginary positions zone comprises time difference boundary.Then, be judged to be the imaginary positions zone in base band part 60 and do not comprise under the situation of time difference boundary, in the time difference information from be stored in flash memory 66, obtain the time difference data in imaginary positions zone.That is, base band part 60 is as the time difference detection unit performance function of an embodiment of the invention.
In addition, the action of base band part 60 is synchronous with the reference clock signal of crystal oscillation circuit (TCXO) 65 outputs of band temperature-compensation circuit.RTC 64 generates and is used for timing that satellite-signal is handled.This RTC 64 utilizes from the reference clock signal of TCXO 65 outputs and upwards counts.
In addition, GPS device 70 is as the acceptance division performance function of an embodiment of the invention.
[structure of display device]
Display device 80 constitutes and comprises: control IC (control part) 40, driving circuit 44, LCD driving circuit 45 and quartz vibrator 43.
Control part 40 has storage part 41 and oscillatory circuit 42, carries out various controls.
Control part 40 control GPS devices 70.That is, control part 40 transmits control signal to receiving circuit 30, the reception action of control GPS device 70.
And control part 40 is via the driving of driving circuit 44 steering needles 12.And then control part 40 is via the driving of LCD driving circuit 45 control displays 13.For example, control part 40 also can carry out following control: in the location pattern, and the demonstration in display 13 enterprising trade front positions.
In storage part 41, store inner time information.Inner time information is the information in the moment of wrist-watch 1 internal clocking of band GPS.Inner time information upgrades by the reference clock signal that is generated by quartz vibrator 43 and oscillatory circuit 42.Therefore,, also can upgrade inner time information, continue taking the needle of pointer 12 even stop to provide electric power to receiving circuit 30.
When being set at when surveying pattern, the action of control part 40 control GPS devices 70 according to the GPS time information, is revised inner time information and is stored in the storage part 41.More specifically, inner time information is modified to, and obtained GPS time information is added UTC deviation (current be+14 seconds) and the UTC (coordinated universal time) that obtains.
And when being set at the location pattern, the action of control part 40 control GPS devices 70 according to GPS time information and time difference data, is revised the time difference of inner time information and is stored in the storage part 41.That is, control part 40 is as the time information modification portion performance function of an embodiment of the invention.
Below, illustrate that the time difference correction of the 1st embodiment handles the step of (location pattern).Control part 40 and base band part 60 are realized by special circuit, can carry out the various controls of these processing, but, the CPU that is assembled in the wrist-watch 1 of being with GPS is stored in the control program among storage part 41 and the SRAM 63 etc. respectively and as computing machine performance function, also can carries out the various controls of these processing by carrying out.Control program can be installed via communication units such as the Internet or recording mediums such as CD-ROM, storage card.Promptly, as shown in Figure 5, pass through control program, control part 40 is as receiving control module 40-1, time information modification unit 40-2 and driving control unit 40-3 performance function, base band part 60 obtains unit 60-2, location computing unit 60-3 and time difference identifying unit 60-4 performance function as satellite retrieval unit 60-1, satellite information, carries out time difference correction thus and handles.
[time difference correction processing]
Fig. 6 is the process flow diagram of an example that the time difference correction treatment step of the 1st embodiment is shown.
Under the situation that is set at the location pattern, the wrist-watch 1 of band GPS is carried out time difference correction shown in Figure 6 and is handled.
After time difference correction was handled beginning, at first, the wrist-watch 1 of band GPS received processing by control part 40 (receiving control module 40-1) control GPS device 70.That is, control part 40 (receiving control module 40-1) starting GPS device 70, GPS device 70 begins to receive the satellite-signal (step S10) that sends from gps satellite 10.
Then, base band part 60 (satellite retrieval unit 60-1) beginning satellite searching step (satellite acquisition step) (step S12).In the satellite searching step, GPS device 70 is retrieved the processing of the gps satellite 10 that can catch.
Particularly, for example under the situation that has 30 gps satellites 10, at first, asterisk SV is defended on base band part 60 (satellite retrieval unit 60-1) one side from 1 to 30 change successively, produce and the local code of defending the C/A sign indicating number model identical of asterisk SV on one side.Then, base band part 60 (satellite retrieval unit 60-1) the calculating C/A sign indicating number that baseband signal comprised and the correlation of local code.If the C/A sign indicating number that baseband signal comprised is identical sign indicating number with local code, then correlation regularly has peak value in regulation, and still, if be different sign indicating numbers, then correlation does not have peak value, is roughly zero all the time.
The generation that base band part 60 (satellite retrieval unit 60-1) is adjusted local code is regularly so that the correlation maximum of C/A sign indicating number that baseband signal comprised and local code, under correlation is situation more than the defined threshold, is judged as and has caught the gps satellite 10 of defending asterisk SV.Then, base band part 60 (the satellite retrieval unit 60-1) information (for example defending asterisk) of in SRAM 63 storage parts such as grade, storing each gps satellite 10 of being caught.
In addition, base band part 60 (satellite retrieval unit 60-1) is proceeded the satellite searching step, till the gps satellite 10 that captures the maximum number (for example 12) that can catch.Here, the maximum number that can catch is the maximum number of the gps satellite 10 that once can catch.
(step S14: the situation of "Yes"), force to finish the reception action (step S42) of GPS device 70 under the situation of having passed through time-out time at least before 1 gps satellite of base band part 60 (satellite retrieval unit 60-1) seizure 10.Wrist-watch 1 at band GPS is under the situation of the environment that can't receive, and for example under indoor situation, even carry out the search of all gps satellites 10, does not also have the gps satellite 10 that can catch.Even the wrist-watch 1 of band GPS also can't detect under the situation of the gps satellite 10 that can catch through time-out time, force to finish the search of gps satellite 10, thus, can the less situation that consumes electric power in vain.In addition, time-out time is to begin to receive from GPS device 70 to move to the binding hours that finishes, and sets before receiving beginning.
On the other hand, under through the situation that can catch gps satellite 10 before the time-out time (step S16: the situation of "Yes"), the obtaining of the satellite information (particularly GPS time information and orbit information) of the gps satellite 10 that base band part 60 (satellite information is obtained unit 60-2) beginning is caught (step S18).Particularly, base band part 60 (satellite information is obtained unit 60-2) is carried out following processing: to carrying out demodulation from the navigation message of each gps satellite 10 of being caught, obtain Z enumeration data and ephemeris parameter respectively.Then, base band part 60 (satellite information is obtained unit 60-2) is stored in obtained GPS time information and orbit information among SRAM 63 etc.In addition, handle parallelly with obtaining of satellite information, base band part 60 (satellite retrieval unit 60-1) is proceeded described satellite searching step, till the gps satellite 10 that captures the maximum number (for example 12) that can catch.Then, base band part 60 (satellite information is obtained unit 60-2) carry out successively the gps satellite 10 of being caught satellite information obtain processing.
Base band part 60 (satellite information is obtained unit 60-2) is (step S20: the situation of "Yes"), force to finish the reception action (step S42) of GPS device 70 under the situation of having passed through time-out time before the satellite information of obtaining the gps satellite 10 more than N (for example 3 or 4).For example, can't catch in base band part 60 (satellite retrieval unit 60-1) under the situation of the gps satellite 10 more than the N (for example 3 or 4) or under the little situation of the incoming level of the satellite-signal of the gps satellite 10 of being caught, think the satellite information of the gps satellite 10 that accurate demodulation N (for example 3 or 4) are above, and passed through time-out time.
On the other hand, (step S22: the situation of "Yes"), base band part 60 (location computing unit 60-3) is selected individual (for example 3 or the 4) gps satellite 10 (step S24) of N from the gps satellite 10 of being caught under the situation through the satellite information that can obtain N (for example 3 or 4) above gps satellite 10 before the time-out time.
Here, (z), x, y, z are 3 unknown numbers for x, y for the three-dimensional position of the wrist-watch 1 of determining band GPS.Therefore, (x, y z), need the GPS time information and the orbit information of the gps satellite 10 more than 3 for the three-dimensional position of the wrist-watch 1 that calculates band GPS.And then, in order to improve the location precision, when the inside time information of the wrist-watch 1 of consideration band GPS and the moment error of GPS time information also are unknown number, need the GPS time information and the orbit information of the gps satellite 10 more than 4.
Then, base band part 60 (location computing unit 60-3) is read the satellite information (GPS time information and orbit information) of selected N (for example 3 or 4) gps satellite 10 from SRAM 63 grades, carry out location and calculate, generate positional information (latitude and the longitude in the wrist-watch 1 residing place of band GPS during reception) (step S26).As mentioned above, the GPS time information represents that gps satellite 10 sends moment of initial bits of the subframe of navigation message.Therefore, inside time information when base band part 60 (location computing unit 60-3) can be according to the initial bits that receives subframe and the difference and the time correction data of GPS time information are calculated the pseudo range of the wrist-watch 1 of N (for example 3 or 4) gps satellite 10 and band GPS respectively.And base band part 60 (location computing unit 60-3) can be calculated the position of N (for example 3 or 4) gps satellite 10 respectively according to orbit information.Then, base band part 60 (location computing unit 60-3) can generate the positional information of the wrist-watch 1 of band GPS according to the pseudo range of N (for example 3 or 4) gps satellite 10 and the wrist-watch 1 of band GPS and the position of individual (for example 3 or the 4) gps satellite 10 of N.
And base band part 60 (location computing unit 60-3) is calculated location error (ultimate range in the wrist-watch 1 actual residing place of band GPS and the place determined by positional information).For example, base band part 60 (location computing unit 60-3) is calculated range error (the Determination of distance error between the wrist-watch 1 of gps satellite 10 and band GPS) be multiply by value after the DOP value as the location error.As the DOP value, can use PDOP value or HDOP value etc.
In addition, calculate parallelly, proceed the processing that obtains of the satellite searching step of satellite retrieval unit 60-1 and satellite information that satellite information is obtained unit 60-2 with the location of location computing unit 60-3.Promptly, in the location of location computing unit 60-3 calculates, satellite retrieval unit 60-1 retrieves the processing of gps satellite 10, arrive till the maximum number that can catch up to the quantity of the current gps satellite of catching 10, satellite information obtain the gps satellite 10 that unit 60-2 newly catches successively satellite information obtain processing.Therefore, Yi Bian location computing unit 60-3 can select to comprise N (for example 3 or 4) gps satellite 10 of the gps satellite 10 of new seizure successively, use the satellite information of new gps satellite 10 of catching to proceed location calculating on one side.
Then, base band part 60 (time difference identifying unit 60-4) is calculated imaginary positions zone (zone that the wrist-watch 1 of band GPS may exist) (step S28) according to positional information and location error.Particularly, base band part 60 (time difference identifying unit 60-4) is calculated with the position determined by positional information and is the center, is that the medial region of circle of radius is as the imaginary positions zone with the location error.
Then, base band part 60 (time difference identifying unit 60-4) judges with reference to the time difference information that is stored in the flash memory 66 whether the imaginary positions zone comprises time difference boundary (step S30).
Comprise in the imaginary positions zone that (step S32: the situation of "Yes"), base band part 60 (location computing unit 60-3) judges whether to select all combinations of N (for example 3 or 4) gps satellite 10 to carry out location calculating (step S34) under the situation of time difference boundary from the gps satellite 10 of being caught.
Also the part of all combinations of N (for example 3 or 4) gps satellite 10 is not being carried out (step S34: the situation of "No") under the situation that location calculates, N (for example 3 or 4) gps satellite 10 (step S24) of the combination that wrist-watch 1 selection also the not carrying out location of band GPS calculates carries out location once more and calculates later processing (processing of step S26～S32).Like this, carry out location by other combinations of selecting N (for example 3 or 4) gps satellite 10 and calculate, thereby can reduce the imaginary positions zone, make it not comprise time difference boundary.
(step S34: the situation of "Yes"), the wrist-watch 1 of band GPS carries out the later processing of satellite searching step (processing of step S12～S32) once more under the situation of all combinations of N (for example 3 or 4) gps satellite 10 having been carried out location calculating.Perhaps, the wrist-watch 1 of band GPS can also carry out the later processing of obtaining of satellite information (processing of step S18～S32) once more.
On the other hand, do not comprise (step S32: the situation of "No") under the situation of time difference boundary in the imaginary positions zone, base band part 60 (time difference identifying unit 60-4) is with reference to flash memory 66, from time difference information, obtain the time difference data in imaginary positions zone, control part 40 (time information is revised unit 40-2) uses this time difference data, revises the inside time information (step S36) that is stored in the storage part 41.
Then, the reception release (step S38) of GPS device 70.
At last, control part 40 (driving control unit 40-3) is revised demonstration (time difference) (step S40) constantly according to amended inner time information control Driver Circuit 44 or LCD driving circuit 45.
In addition, under the situation of the reception action of forcing end GPS device 70 (step S42), control part 40 (driving control unit 40-3) control Driver Circuit 44 or LCD driving circuit 45, the demonstration that takes defeat (step S44).
Fig. 7 is used for illustrating that imaginary positions zone that the time difference correction treatment step at Fig. 6 calculates for the 1st time does not comprise the figure of the situation of time difference boundary.
Geography information 100 is the cartographic informations with time zone (time difference zone), comprises a plurality of regional A, B by being cut apart by the boundary line shown in the solid line, C etc.That is, the time difference difference of adjacent area, each regional boundary line is the time difference boundary line.For example, regional A, B, C be respectively at time difference of UTC for+7 ,+8 ,+9 time difference zone.In the flash memory 66 of the wrist-watch 1 of the band GPS of present embodiment,, store boundary line data and the time difference data of each zone (A, B, C etc.) as the time difference information corresponding with geography information 100.The boundary line data for example are divided into a plurality of short lines with each boundary line, store as the vector data (coordinate datas at the two ends of each straight line) of each straight line.
The time difference correction step of wrist-watch 1 beginning Fig. 6 of the band GPS of present embodiment, in step S28, base band part 60 (time difference identifying unit 60-4) is calculated imaginary positions zone P1 shown in Figure 7.In step S30, at first, base band part 60 (time difference identifying unit 60-4) is read the boundary line data of the near zone of imaginary positions zone P1 from flash memory 66, and all parts that detect imaginary positions zone P1 are included in the area B.Then, base band part 60 (time difference identifying unit 60-4) is read the time difference data of area B from flash memory 66, and the time difference of area B only is UTC+8, so, be judged to be imaginary positions zone P1 and do not comprise time difference boundary.Then, in step S36, base band part 60 (time difference identifying unit 60-4) obtains the time difference (UTC+8) of imaginary positions zone P1, and control part 40 (time information is revised unit 40-2) is revised inner time information.Then, the reception of GPS device 70 finishes (step S38), is modified in the moment that shows on the display part, and the time difference correction processing finishes (step S40).
Fig. 8 A and Fig. 8 B are used for illustrating that imaginary positions zone that the time difference correction treatment step at Fig. 6 calculates for the 1st time comprises the figure of the situation of time difference boundary.
Geography information 100 is identical with the geography information 100 of Fig. 7, thus the mark same numeral, and omit its explanation.
The time difference correction step of wrist-watch 1 beginning Fig. 6 of the band GPS of present embodiment, in step S28, the imaginary positions zone P1 shown in base band part 60 (time difference identifying unit 60-4) the calculating chart 8A.In step S30, at first, base band part 60 (time difference identifying unit 60-4) is read the boundary line data of the near zone of imaginary positions zone P1 from flash memory 66, and a part that detects imaginary positions zone P1 is included among regional A, B, the C.Then, base band part 60 (time difference identifying unit 60-4) is read the time difference data of regional A, B, C from flash memory 66, the time difference difference of regional A, B, C, so, be judged to be imaginary positions zone P1 and comprise time difference boundary.
Therefore, in step S24, base band part 60 (location computing unit 60-3) is selected the new combination of N (for example 3 or 4) gps satellite 10, carrying out location once more calculates, in step S28, base band part 60 (time difference identifying unit 60-4) is according to new positional information, the imaginary positions zone P2 shown in the calculating chart 8B.In step S30, base band part 60 (time difference identifying unit 60-4) is read the boundary line data of the near zone of imaginary positions zone P2 from flash memory 66, all parts that detect imaginary positions zone P2 are included in the area B, so, be judged to be imaginary positions zone P2 and do not comprise time difference boundary.Then, in step S36, base band part 60 (time difference identifying unit 60-4) obtains the time difference (UTC+8) of imaginary positions zone P2, and control part 40 (time information is revised unit 40-2) is revised inner time information.Then, the reception of GPS device 70 finishes (step S38), is modified in the moment that shows on the display part, and the time difference correction processing finishes (step S40).
In the wrist-watch of the band GPS of the 1st embodiment, as shown in Figure 6, from the gps satellite 10 of being caught, select N gps satellite 10 to carry out location and calculate, according to positional information that calculates by location and location error, calculating imaginary positions zone.Then, the time difference information with reference to being stored in the flash memory 66 does not comprise under the situation of time difference boundary in the imaginary positions zone that is calculated, and finishes to receive action and revise constantly to show.Here, if the imaginary positions zone that is calculated does not comprise time difference boundary, then can guarantee to be positioned at the regional arbitrary site of the same time difference.Therefore, if the purpose of time adjustment (time difference correction), the judgment standard that then receives release is not the precision that location calculates, but whether the imaginary positions zone comprises time difference boundary.
For example, in the situation of Fig. 7, imaginary positions zone P1 is zone (for example radius is the inside of the circle of hundreds of km) quite widely, and still, the wrist-watch 1 of band GPS must be positioned at the arbitrary site in the time difference zone of UTC+8.That is,, also can carry out time difference correction even under the quite low situation of location precision.As the low situation of location precision, for example, consider to reduce the configuration status difference of the situation of distance accuracy, the gps satellite 10 in location calculates, selected and make the sizable situation of DOP value in order stagger constantly in the inside of the wrist-watch 1 of the moment that makes gps satellite 10 and band GPS.In the past, proceeding location calculates till the imaginary positions zone becomes the zonule that does not comprise time difference boundary, so the time difference correction spended time can't carry out time difference correction sometimes.
But, wrist-watch according to the band GPS of the 1st embodiment, even the imaginary positions zone is quite extensive, as long as be included in 1 time difference zone, so, can't determine under the situation of correct position even the precision of calculating at location is low, also can finish location and calculate and carry out time adjustment according to the position.
That is, according to the wrist-watch of the band GPS of the 1st embodiment, if the imaginary positions zone that is calculated does not comprise time difference boundary, further do not reduce the scope even then the precision of location calculating is low yet, but finish to receive action and carry out the time difference correction processing, so, can reduce power consumption.
On the other hand, in the situation of Fig. 8 A and Fig. 8 B, the imaginary positions zone P1 that calculates for the 1st time is zone (for example radius is the inside of the circle of hundreds of km) quite widely, and the wrist-watch 1 of band GPS may be arranged in the time difference zone of UTC+7, UTC+8, UTC+9.Therefore, the wrist-watch 1 of band GPS does not carry out time difference correction according to imaginary positions zone P1.Like this, in the wrist-watch of the band GPS of the 1st embodiment, under the candidate's who has a plurality of time differences situation, do not carry out time difference correction, thereby prevent to carry out wrong time difference correction.
And then, in the wrist-watch of the band GPS of the 1st embodiment, comprise under the situation of time difference boundary in the imaginary positions zone that is calculated, carrying out new location in binding hours repeatedly calculates, till the imaginary positions zone does not comprise time difference boundary, the time point that does not comprise time difference boundary in the imaginary positions zone finishes to receive action and carry out time difference correction and handle immediately.Promptly, wrist-watch according to the band GPS of the 1st embodiment, comprise under the situation of time difference boundary in the imaginary positions zone that is calculated, consider that on one side carry out time difference correction in binding hours handles as far as possible, optimize the time that consumes the big reception action of electric power on one side, can be with the MIN consumption electric power of necessity modification finish time (time difference correction).
And, according to the wrist-watch of the band GPS of the 1st embodiment, in time difference correction is handled,, finish to receive action even also can't determine under the situation of the time difference through binding hours, so, can prevent to consume in vain electric power.
2-2. the 2nd embodiment
Shown in Fig. 7 and Fig. 8 A, Fig. 8 B, in the 1st embodiment, utilize the time difference boundary line to cut apart geography information 100, so each zone after cutting apart is complicated shape.Therefore, in the 1st embodiment, the data volume of boundary line data is big, so, need very big memory storage, may cause the size of wrist-watch to become big.And then whether the imaginary positions zone comprises the judgement complexity of time difference boundary, so judging needs the time, reckons with that also power consumption increases.
Therefore, in the wrist-watch of the band GPS of the 2nd embodiment, in order to cut down the data volume of time difference information (boundary line data), not to utilize the time difference boundary line to cut apart geography information 100, but geography information 100 is divided into a plurality of zones of definite shape, coordinate data and time difference data that each is regional are stored in the flash memory 66 as time difference information.In addition, the basic structure of the wrist-watch of the band GPS of the 2nd embodiment is identical with the structure of the wrist-watch of the band GPS of the 1st embodiment, so omit its explanation.
Fig. 9 is the figure of an example that the geography information in a plurality of zones that are split into rectangular shape is shown.
Geography information 100 is split into 16 rectangular areas that imaginary area 101 comprises, 16 rectangular areas that imaginary area 102 comprised, imaginary area 103 comprised 16 rectangular areas and rectangular area 104 etc. defined the value at the time difference of UTC respectively in each zone.Below, these zones that defined the value of the time difference are called " time difference defined range ".For example, in time difference defined range 104, defined the time difference of "+8 ".And, in time difference defined range 102A that imaginary area 102 is comprised and 102E, defined the time difference of "+7 ", in time difference defined range 102I, 102J, 102M, 102N and 102P, define the time difference of "+8 ", in time difference defined range 102B, 102C, 102D, 102F, 102G, 102H, 102K, 102L and 102O, defined the time difference of "+9 ".
Like this, at each defined range 1 time difference of definition time difference.And, in the wrist-watch of the band GPS of the 2nd embodiment, as described later, time difference defined range is carried out the judgement whether the imaginary positions zone comprises time difference boundary as least unit.Therefore,, then can improve the judgement precision of time difference boundary if make each time difference defined range not comprise real time difference boundary line as far as possible, so, for example, can make near the time difference defined range of time difference boundary line very little.But, make under the situation that is shaped as rectangle of time difference defined range, even supposed the very little situation that also comprises the time difference boundary line of reality of time difference defined range.In fact, if little time difference defined range increases, then the data volume of time difference information also increases, so, need the big memory storage of memory capacity, so, consider the compromise proposal of the judgement precision of the data volume of time difference information and time difference boundary, decide the size of each time difference defined range.Therefore, suppose that time difference defined range comprises the situation of the time difference boundary line of reality.
Like this, comprise at time difference defined range under the situation of real time difference boundary line, for example, also the occupied area of the region with each time difference that can be comprised 1 time difference defined range compares, time difference of the region of occupied area maximum is defined as the time difference of this time difference defined range, in 1 time difference defined range, include under the metropolitan situation, also can be defined as the time difference of this time difference defined range this metropolitan time difference.In Fig. 9, for example, the time difference, defined range 102E comprised the time difference boundary of UTC+7 and UTC+8.That is, time difference defined range 102E comprises the region of the time difference of the region of the time difference of UTC+7 and UTC+8, and still, the occupied area of the region of UTC+7 is bigger than the occupied area of the region of UTC+8, so, in time difference defined range 102E, defined time difference of "+7 ".
In addition, in Fig. 9, imaginary area 101,102,103 comprises a plurality of time difference defined ranges that defined the different time differences, so, do not define value at the time difference of UTC.For example, imaginary area 102 comprises the time difference defined range of "+7 ", "+8 ", "+9 ", so, do not define the value of the time difference.
Figure 10 and Figure 11 are illustrated in the figure that is stored in an example of the time difference information in the flash memory 66 in the wrist-watch of band GPS of the 2nd embodiment.
Zone shown in Figure 10-time difference corresponding tables 200 comprises each regional position data 200-1 and time difference data 200-2 such as imaginary area shown in Figure 9 101,102,103, time difference defined range 104.
Imaginary area 101,102,103 shown in Figure 9, time difference defined range 104 etc. for example are that each length of thing and North and South direction is the zone of the rectangular shape about 1000～2000km.Therefore, imaginary area 101,102,103, time difference defined range 104 etc. for example can be determined the position by the top-left coordinates (longitude, latitude) of rectangular area and the bottom right coordinate (longitude, latitude) in zone.Therefore, in flash memory 66,, store this coordinate data of 2 as the position data 200-1 of zone-time difference corresponding tables 200.
Here, time difference defined range 104 has defined the value "+8 " of the time difference, so in flash memory 66, the time difference data 200-2 as time difference defined range 104 stores "+8 ".
On the other hand, imaginary area 101,102,103 does not define the value of the time difference, so, in flash memory 66, as the time difference data 200-2 of imaginary area 101,102,103, store reference link " Link1 ", " Link2 ", " Link13 " respectively at other zones-time difference corresponding tables.
Zone shown in Figure 11-time difference corresponding tables 202 comprises position data 202-1 and the time difference data 202-2 of time difference defined range 102A～102P that imaginary area shown in Figure 9 102 comprised.Zone-time difference corresponding tables 202 can promptly be carried out reference with reference to link Link2 by the time difference data of imaginary area 102 in zone-time difference corresponding tables 200 of Figure 10.
In the present embodiment, as shown in Figure 9, time difference defined range 102A～102P carries out 16 divided area to imaginary area 102, so time difference defined range 102A～102P for example is the zone of rectangular shape in the four directions of 250～500km.Therefore, for example can determine the position by the top-left coordinates (longitude, latitude) in zone and the bottom right coordinate (longitude, latitude) in zone.Therefore, in flash memory 66,, store this coordinate data of 2 as the position data 202-1 of zone-time difference corresponding tables 202.
And the time difference, defined range 102A～102P defined the value of the time difference shown in Figure 9 respectively, so, in flash memory 66,, store the value of each time difference as the time difference data 200-2 of time difference defined range 102A～102P.
In addition, time difference defined range 104 is corresponding to the 1st layer the zone of an embodiment of the invention, and time difference defined range 102A～102P is corresponding to the 2nd layer the zone of an embodiment of the invention.And zone-time difference corresponding tables 200 is corresponding to the 1st layer the time difference information of an embodiment of the invention, and zone-time difference corresponding tables 202 is corresponding to the 2nd layer the time difference information of an embodiment of the invention.
As mentioned above, do not have the imaginary area that comprises time difference defined range 104, still, the time difference, defined range 102A～102P was included in the imaginary area 102.Therefore, the data of time difference defined range 104 are included in zone-time difference corresponding tables 200, relative therewith, each data of time difference defined range 102A～102P are included in by reference link Link2 from the zone-time difference corresponding tables 202 of zone-time difference corresponding tables 200 references.Therefore, can think that time difference defined range passes through imaginary area and stratification.That is, time difference defined range 104 is corresponding to the 1st layer the zone of an embodiment of the invention, and time difference defined range 102A～102P is corresponding to the 2nd layer the zone of an embodiment of the invention.And zone-time difference corresponding tables 200 is corresponding to the 1st layer the time difference information of an embodiment of the invention, and zone-time difference corresponding tables 202 is corresponding to the 2nd layer the time difference information of an embodiment of the invention.
In addition, imaginary area also can further comprise imaginary area.For example, when definition comprised the imaginary area of time difference defined range 102A, 102B, 102E, 102F, imaginary area 102 comprised this imaginary area.Under this situation, time difference defined range 102A, 102B, 102E, 102F comprise the position data of time difference defined range 102A, 102B, 102E, 102F and the zone of time difference data-time difference corresponding tables the 3rd layer time difference information corresponding to an embodiment of the invention corresponding to the 3rd layer the zone of an embodiment of the invention.Equally, also time difference defined range can be categorized as the zone of the 1st layer～N layer, the time difference information that will comprise the zone-time difference corresponding tables of the 1st layer～N layer is stored in the flash memory 66.
Figure 12 is illustrated in the wrist-watch of band GPS of the 2nd embodiment to judge whether the imaginary positions zone comprises the process flow diagram of the treatment step of time difference boundary.In addition, the treatment step of Figure 12 is equivalent to an example of the concrete treatment step of step S30 in the time difference correction treatment step of Fig. 6.
At first, base band part 60 (time difference identifying unit 60-4) detects imaginary area and time difference defined range (the 1st zone) (step S30-1) that the imaginary positions zone is comprised according to the 1st layer time difference information (the 1st time difference information).Particularly, base band part 60 (time difference identifying unit 60-4) is determined the position in the 1st zone with reference to the position data (coordinate data) of the 1st time difference information, detects the 1st zone in the medial region that at least a portion is included in the circle corresponding with the imaginary positions zone.
Then, base band part 60 (time difference identifying unit 60-4) obtains the time difference data (value of the time difference and reference link) (step S30-2) in all the 1st zones of being detected.
Then, base band part 60 (time difference identifying unit 60-4) is judged the value whether consistent (step S30-3) of the time difference of this or all time difference defined ranges of obtaining in the past.
(step S30-4: the situation of "No"), base band part 60 (time difference identifying unit 60-4) is judged to be the imaginary positions zone and comprises time difference boundary (step S30-9) under the inconsistent situation of at least a portion of the value of this or time difference of obtaining in the past.
On the other hand, (step S30-4: the situation of "Yes"), base band part 60 (time difference identifying unit 60-4) judges whether the processing with reference to link of this or all imaginary area of obtaining in the past finishes (step S30-5) under the situation of the value unanimity of time difference of this or all time difference defined ranges of obtaining in the past.
(step S30-6: the situation of "Yes") under the situation that has untreated reference link, base band part 60 (time difference identifying unit 60-4) detects the k zone (step S30-7) that the imaginary positions zone is comprised according to the time difference information (k time difference information) with reference to the link destination.Then, base band part 60 (time difference identifying unit 60-4) is carried out the processing of step S30-2～S30-7 repeatedly, till not existing untreated at least a portion with reference to link or this or all time difference value of obtaining in the past inconsistent.
(step S30-6: the situation of "No"), base band part 60 (time difference identifying unit 60-4) is judged to be the imaginary positions zone and does not comprise time difference boundary (step S30-8) under the untreated situation with reference to link not existing.
Figure 13 is used for illustrating the figure that does not comprise the situation of time difference boundary in the imaginary positions zone that treatment step calculated of Figure 12.In addition, in the situation of Figure 13, in flash memory 66, store each data of Figure 10 and zone-time difference corresponding tables shown in Figure 11, calculate the imaginary positions zone identical with the situation of Fig. 7.
According to the position data of zone shown in Figure 10-time difference corresponding tables 200, be judged to be imaginary positions zone P1 shown in Figure 13 and only comprise time difference defined range 104 as the 1st zone.And the time difference data of the time difference defined range 104 of zone shown in Figure 10-time difference corresponding tables 200 is "+8 ".Therefore, be judged to be imaginary positions zone P1 and do not comprise time difference boundary,, obtain "+8 " as the time difference of imaginary positions zone P1.
Figure 14 A and Figure 14 B are used for illustrating the figure that comprises the situation of time difference boundary in the imaginary positions zone that treatment step calculated of Figure 12.In addition, in the situation of Figure 14 A and Figure 14 B, in flash memory 66, store each data of Figure 10 and zone-time difference corresponding tables shown in Figure 11, calculate the imaginary positions zone identical with the situation of Fig. 8 A and Fig. 8 B.
According to the position data of zone shown in Figure 10-time difference corresponding tables 200, be judged to be the imaginary positions zone P1 shown in Figure 14 A and comprise imaginary area 101,102,103, time difference defined range 104 as the 1st zone.And the time difference data of the imaginary area 101,102,103 of zone-time difference corresponding tables 200 is that the time difference data of time difference defined range 104 is "+8 " with reference to link " Link1 ", " Link2 ", " Link13 ".
And then, according to the position data of the zone shown in Figure 11-time difference corresponding tables 202 by the Link2 reference, be judged to be imaginary positions zone P1 and comprise time difference defined range 102E, 102F, 102I, 102J, 102K, 102M, 102N and 102O as the 2nd zone.And the time difference data of time difference defined range 102E, 102F, 102I, 102J, 102K, 102M, 102N and the 102O of zone-time difference corresponding tables 202 is respectively time difference value "+7 ", "+9 ", "+8 ", "+8 ", "+9 ", "+8 ", "+8 ", "+9 ".Therefore, be judged to be imaginary positions zone P1 and comprise time difference boundary.Follow the imaginary positions zone P2 shown in the calculating chart 14B.
According to the position data of zone shown in Figure 10-time difference corresponding tables 200, be judged to be the imaginary positions zone P2 shown in Figure 14 B and only comprise imaginary area 102 as the 1st zone.The time difference data of the imaginary area 102 of zone shown in Figure 10-time difference corresponding tables 200 is " Link2 ".
And then, according to the position data of the zone shown in Figure 11-time difference corresponding tables 202 by the Link2 reference, be judged to be imaginary positions zone P1 and comprise time difference defined range 102I, 102M and 102N as the 2nd zone.And time difference defined range 102I, the 102M of zone-time difference corresponding tables 202 and the time difference data of 102N all are "+8 ".Therefore, be judged to be imaginary positions zone P2 and do not comprise time difference boundary,, obtain "+8 " as the time difference of imaginary positions zone P2.
According to the wrist-watch of the band GPS of the 2nd embodiment, except the effect identical, also obtain following effect with the wrist-watch of the band GPS of the 1st embodiment.
According to the wrist-watch of the band GPS of the 2nd embodiment, judge whether the imaginary positions zone that is calculated comprises part or all of imaginary area, under situation about comprising, judge with reference to the position of the time difference defined range of this imaginary area inside to have or not time difference boundary.Therefore, if the regions that a plurality of little time difference zones are intensive are as imaginary area, then do not comprise under the situation of imaginary area, do not need to judge separately whether the imaginary positions zone comprises part or all of these a plurality of little time difference zones in the imaginary positions zone that is calculated.Therefore, according to the wrist-watch of the band GPS of the 2nd embodiment, can optimize the time whether the imaginary positions zone comprises the determination processing of time difference boundary.
And, wrist-watch according to the band GPS of the 2nd embodiment, comprise under the situation of imaginary area in the imaginary positions zone that is calculated, judge according to the position of a plurality of time difference defined ranges that imaginary area comprised whether the imaginary positions zone comprises time difference boundary, so, can guarantee the high precision of judging.
And,, at first,, judge whether the imaginary positions zone comprises the 1st layer part or all of imaginary area with reference to the 1st layer time difference information according to the wrist-watch of the band GPS of the 2nd embodiment.Comprise in the imaginary positions zone under the 1st layer part or all the situation of imaginary area, then,, judge whether the imaginary positions zone comprises the 2nd layer part or all of imaginary area with reference to the 2nd layer time difference information.Equally, comprise in the imaginary positions zone under part or all the situation of imaginary area of k layer,, judge whether the imaginary positions zone comprises part or all of imaginary area of k+1 layer with reference to the time difference information of k+1 layer.Then, do not comprise in the imaginary positions zone under part or all the situation of imaginary area of k layer,, judge whether the imaginary positions zone comprises time difference boundary according to the position of the time difference defined range of k layer.That is, according to the wrist-watch of the band GPS of the 2nd embodiment, can be successively with reference to according to the size in the zone that has defined the time difference and the suitable time difference information of stratification, carry out determination processing simultaneously, so, can optimize time of determination processing.
And, according to the wrist-watch of the band GPS of the 2nd embodiment, time difference defined range and imaginary area be shaped as rectangular shape, so in order to determine the zone, only cornerwise 2 point coordinate data of storage rectangle get final product.Therefore, compare, can significantly cut down the data volume of time difference information with careful each data conditions of cutting apart the short lines of time difference boundary line of storage.
And, according to the wrist-watch of the band GPS of the 2nd embodiment, under the situation of the size of the rectangular shape of the time difference defined range that time difference information comprised of having fixed each layer and imaginary area, coordinate data is only stored at 1 and is got final product, so, the data volume that can further cut down time difference information.
And then according to the wrist-watch of the band GPS of the 2nd embodiment, time difference defined range and imaginary area are rectangular shape, so whether the imaginary positions zone that can carry out being calculated very simply comprises the determination processing of time difference boundary.
2-3. the 3rd embodiment
Figure 15 is the process flow diagram of an example of time difference correction treatment step of wrist-watch that the band GPS of the 3rd embodiment is shown.
Time difference correction treatment step shown in Figure 15 time difference correction treatment step with shown in Figure 6 basically is identical.That is, the processing of the step S10～S44 of time difference correction treatment step shown in Figure 15 is identical with the processing of the step S10～S44 of time difference correction treatment step shown in Figure 6, so, mark identical mark and omit its explanation.
In time difference correction treatment step shown in Figure 15,, increased the processing (processing of step S46) that shows the imaginary positions zone with respect to time difference correction treatment step shown in Figure 6.In addition, the processing (processing of step S46) that shows the imaginary positions zone also can be carried out before in the processing (processing of step S40) of revising demonstration constantly.
Figure 16 is the figure of an example of demonstration in imaginary positions zone that is used for illustrating the step 46 of time difference correction treatment step shown in Figure 15, is the skeleton diagram of appearance of wrist-watch that the band GPS of the 3rd embodiment is shown.In addition, the basic structure of the wrist-watch of the band GPS of the 3rd embodiment is identical with the structure of the wrist-watch of the band GPS of the 1st embodiment, so, same structure is marked same No. and omits its explanation.
Surface at the wrist-watch 3 of being with GPS is formed with map 300, disposes the pointer 301,302 of rotary type along its upper limb.Map 300 is a world map, during arbitrary site in moving to the world, shows its current locations by pointer 301,302.As world map, can suitably utilize existing map, being not limited to Japan is the minute surface map at center, also can use other maps.
Map 300 fixedly is formed on the surface of dial plate 11 by means such as engraving or printings.As dial plate 11, use transparent material, also can be at its back side towards the figure of the inside mint-mark or printed map 300.Perhaps, also can be on film printed map 300, this film is attached to the back side of transparent dial plate 11 etc.That is, as long as can be that the face side of dial plate 11 is with normal state visuognosis map 300 from display board.
Pointer 301,302 has turning axle 303,304, can serve as that axle rotates along the surface of dial plate 11 with them.The driving of pointer 301,302 is controlled by control part 40 (driving control unit 40-3) via driving circuit 44.
The motion track 305,306 of pointer 301,302 of following rotation is shown in double dot dash line.Map 300 forms in the overlapping scope of the motion track 305,306 that is accommodated in 2 root pointers 301,302.In this scope, 2 root pointers 301,302 can intersect at an arbitrary position mutually.Therefore, by the intersection point of 2 root pointers 301,302, can indicate the ad-hoc location on the map 300.
Turning axle 303,304 upper edge portion across map 300 are configured in both sides.The line segment in the axle center of connection turning axle 303,304 is for keeping out of the way line 307, and this keeps out of the way line 307 shown in the single-point line, is configured in the outside of the upper limb of map 300.In addition, strictly, the part of the pattern of map 300 surpasses and keeps out of the way line 307, and still, the part that allows not utilize when pointer 301,302 indication current locations is above keeping out of the way line 307.
Pointer 301,302 is along keeping out of the way line 307 configurations, and promptly each front end thus, can be kept out of the way the substantial outside of map 300 towards another turning axle 303,304.
Under the situation that is set at the location pattern, after the time difference revises processing and finishes,, indicate the position on the map 300 that is equivalent to positional information by the intersection point of pointer 301,302 by the drive controlling of control part 40 (driving control unit 40-3).Like this, the wrist-watch 3 of band GPS is not digital display position information, but shows by the intersection point of pointer 301,302, so, do not require high-precision position information.That is, the time difference correction by present embodiment is handled, even calculating under the situation in imaginary positions zone more widely, is with the wrist-watch 3 of GPS also can show the position of summary.In addition, calculating under the situation of imaginary positions zone (for example radius is the zone of hundreds of km) quite widely, for example, also can make the scope internal vibration of pointer 301,302, so that can discern the area in imaginary positions zone in the imaginary positions zone.
According to the wrist-watch of the band GPS of the 3rd embodiment, except the effect identical, also obtain following effect with the wrist-watch of the band GPS of the 1st embodiment.
According to the wrist-watch of the band GPS of the 3rd embodiment, use the intersection point of 2 root pointers 301,302, can indicate clearly on the map 300 a bit.The pointer 301,302 that intersects extends towards periphery, so the position of following the trail of intersection point easily is suitable for holding sensuously current location.
And, according to the wrist-watch of the band GPS of the 3rd embodiment, be to form map 300 on the dial plate 11 at display board, thereby do not need to use display panels etc., can keep good texture as wrist-watch 1.
2-4. the 4th embodiment
Figure 17 is the process flow diagram of an example of time difference correction treatment step of wrist-watch that the band GPS of the 4th embodiment is shown.In addition, the basic structure of the wrist-watch of the band GPS of the 4th embodiment is identical with the structure of the wrist-watch of the band GPS of the 1st embodiment, so omit its explanation.
Time difference correction treatment step shown in Figure 17 time difference correction treatment step with shown in Figure 6 basically is identical.That is, the processing of the step S10～S44 of time difference correction treatment step shown in Figure 17 is identical with the processing of the step S10～S44 of time difference correction treatment step shown in Figure 6, so, mark identical mark and omit its explanation.
In time difference correction treatment step shown in Figure 17, different with time difference correction treatment step shown in Figure 6, comprise (step S32: the situation of "Yes"), carry out the satellite searching step once more under the situation of time difference boundary in the imaginary positions zone of all combinations of N (for example 3 or 4) gps satellite 10 having been carried out calculate.And base band part 60 (satellite retrieval unit 60-1) judged whether the quantity of the gps satellite 10 of current seizure arrives the maximum number (for example 12) (step S48) that can catch before beginning satellite searching step.
(step S48: the situation of "Yes") under the situation of the gps satellite 10 of having caught the maximum number that to catch (for example 12), base band part 60 (satellite retrieval unit 60-1) stops to become the seizure of M (for example 1) gps satellite 10 of the main cause that makes the deterioration of location precision, is set the object outer (step S50) into next satellite acquisition.Here, base band part 60 (location computing unit 60-3) is carried out location to all combinations of N (for example 3 or 4) gps satellite 10 and is calculated, so base band part 60 (satellite retrieval unit 60-1) is known under the situation that comprises which gps satellite 10 location precision deterioration.
Then, the wrist-watch 1 of band GPS carries out the later processing of satellite searching step (processing of step S12～S34) once more.Thus, can replace making the gps satellite 10 of location precision deterioration, select new gps satellite 10 of catching to carry out location and calculate, so, can reduce the imaginary positions zone, make it not comprise time difference boundary.
On the other hand, (step S48: the situation of "No"), the wrist-watch 1 of band GPS carries out the later processing of satellite searching step (processing of step S12～S34) once more under the situation of the gps satellite 10 that does not have to catch the maximum number (for example 12) that can catch.
In addition, in time difference correction treatment step shown in Figure 17, comprise (step S32: the situation of "Yes") under the situation of time difference boundary in the imaginary positions zone, carried out (step S34: the situation of "Yes"), carry out the satellite searching step once more under the situation of location calculating in all combinations of from the gps satellite 10 of being caught, selecting N gps satellite 10.
According to the wrist-watch of the band GPS of the 4th embodiment, except the effect identical, also obtain following effect with the wrist-watch of the band GPS of the 1st embodiment.
In the wrist-watch of the band GPS of the 4th embodiment, even from the gps satellite 10 of being caught, select which combination of N gps satellite 10, comprise in the imaginary positions zone under the situation of time difference boundary, also catch new gps satellite 10, use its satellite information to carry out location and calculate.And then, be under the situation of the maximum number that can catch in the quantity of the gps satellite 10 of current seizure, replace becoming M (for example 1) gps satellite 10 of the main cause that makes the deterioration of location precision, use the satellite information of new gps satellite 10 of catching to carry out location and calculate.Therefore, can improve the precision that location calculates, so calculating does not comprise the little imaginary positions zone of time difference boundary easily.Therefore, wrist-watch according to the band GPS of the 4th embodiment, even be positioned under the situation of comparison near the place of time difference boundary, also determine the time difference easily, can optimize location and calculate needed consumption electric power and revise (time difference correction) finish time with as far as possible little consumption electric power.
2-5. the 5th embodiment
Figure 18 is the process flow diagram of an example of time difference correction treatment step of wrist-watch that the band GPS of the 5th embodiment is shown.
Time difference correction treatment step shown in Figure 180 time difference correction treatment step with shown in Figure 17 basically is identical.That is, the processing of the step S10～S44 of time difference correction treatment step shown in Figure 180 is identical with the processing of the step S10～S44 of time difference correction treatment step shown in Figure 17, so, mark identical mark and omit its explanation.
In time difference correction treatment step shown in Figure 180,, increased the processing (processing of step S46) that shows the imaginary positions zone with respect to time difference correction treatment step shown in Figure 17.In addition, the processing (processing of step S46) that shows the imaginary positions zone also can be carried out before in the processing (processing of step S40) of revising demonstration constantly.
The demonstration in the imaginary positions zone of the step 46 of time difference correction treatment step shown in Figure 180 for example can use the wrist-watch at band GPS illustrated in fig. 16 to carry out.
According to the wrist-watch of the band GPS of the 5th embodiment, except the effect identical, also obtain following effect with the wrist-watch of the band GPS of the 4th embodiment.
According to the wrist-watch of the band GPS of the 5th embodiment, use the intersection point of 2 root pointers 301,302, can indicate clearly on the map 300 a bit.The pointer 301,302 that intersects extends towards periphery, so the position of following the trail of intersection point easily is suitable for holding sensuously current location.
And, according to the wrist-watch of the band GPS of the 5th embodiment, be to form map 300 on the dial plate 11 at display board, thereby do not need to use display panels etc., can keep good texture as wrist-watch 1.
In addition, the invention is not restricted to present embodiment, in the scope of purport of the present invention, can carry out various distortion and implement.
The present invention comprises the structure identical in fact with the structure that illustrates (for example, function, method and the structure that comes to the same thing or the purpose structure identical with effect) in embodiment.And the present invention comprises the structure after the structure non-intrinsically safe that illustrates partly replaced in embodiment.And the present invention comprises the structure that can bring into play the action effect identical with the structure that illustrates in embodiment or the structure of reaching identical purpose.And the present invention is included in the structure of additional known technology in the structure that illustrates in the embodiment.
As mentioned above, describe embodiments of the present invention in detail, still, for a person skilled in the art, can easily understand the various deformation that substantially not to break away from novel item of the present invention and effect.Therefore, this variation also all is included in the scope of the present invention.

Claims (9)

1. electronic watch, this electronic watch has the function of reception from the satellite-signal of positional information satellite transmission, and this electronic watch is characterised in that this electronic watch comprises:
Acceptance division, it receives described satellite-signal, obtains satellite information from the described satellite-signal that is received;
The satellite search part, it carries out following processing: retrieve the described positional information satellite that can catch according to the described satellite-signal that is received, and catch the described positional information satellite that retrieves;
The location calculating part, it selects the described positional information satellite of stated number from the described positional information satellite that described satellite search part is caught, calculate according to carry out location at the described satellite information that from the described satellite-signal of selected described positional information satellite transmission, comprises, generate positional information;
Time information modification portion, it revises inner time information according to described satellite information;
The time information display part, it shows described inner time information;
Storage part, its storage defines the time difference information that obtains to each time difference in a plurality of zones, and described a plurality of zones are cut apart geography information and are obtained; And
Time difference detection unit, it judges according to described time difference information whether described imaginary positions zone comprises time difference boundary according to described positional information calculation imaginary positions zone,
Do not comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, described inner time information is revised according to the time difference in described imaginary positions zone by described time information modification portion,
Comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, described location calculating part is reselected the described positional information satellite of described stated number, and proceed described location and calculate,
Do not comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, described acceptance division finishes the reception of described satellite-signal.
2. electronic watch according to claim 1 is characterized in that,
Described satellite search part is proceeded the processing of the described positional information satellite that can catch of retrieving novel, till the described positional information satellite that captures the maximum number that to catch, when capturing the described positional information satellite of the maximum number that can catch, comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, stop the seizure of at least one described positional information satellite, carry out the processing of the described positional information satellite that can catch of retrieving novel.
3. electronic watch according to claim 1 and 2 is characterized in that,
, be judged to be described imaginary positions zone by described time difference detection unit and do not comprising in the absence of time difference boundary before the time through predetermined restricted, described acceptance division finishes the reception of described satellite-signal.
4. electronic watch according to claim 1 and 2 is characterized in that,
Described location calculating part calculates described error of position information according to the DOP value,
Described time difference detection unit calculates described imaginary positions zone according to described error.
5. electronic watch according to claim 1 and 2 is characterized in that,
This electronic watch comprises the positional information display part that shows described positional information,
Do not comprise under the situation of time difference boundary being judged to be described imaginary positions zone by described time difference detection unit, described positional information display part upgrades the demonstration of described positional information.
6. electronic watch according to claim 1 and 2 is characterized in that,
Described time difference information comprises the information of the position that is used for definite imaginary area, and this imaginary area comprises cuts apart a plurality of described zone that has defined the different time differences in a plurality of described zone that obtains to described geography information,
Described time difference detection unit judges according to described time difference information whether described imaginary positions zone comprises at least a portion of described imaginary area, comprise under the situation of described imaginary area in described imaginary positions zone, according to the position in the described zone that described imaginary area comprised, judge whether described imaginary positions zone comprises time difference boundary.
7. electronic watch according to claim 6 is characterized in that,
Described zone is classified as the zone of the 1st layer～N layer, wherein, and N 〉=2,
Described time difference information comprises the time difference information of the 1st layer～N layer of the time difference in the described zone that has defined the 1st layer～N layer respectively,
Described imaginary area in the described time difference information of k layer comprises the following described zone of k+1 layer, wherein, and 1≤k＜N,
Described time difference detection unit judges according to the described time difference information of k layer whether described imaginary positions zone comprises at least a portion of described imaginary area, comprise in described imaginary positions zone under the situation of at least a portion of described imaginary area, judge according to the described time difference information of k+1 layer whether described imaginary positions zone comprises at least a portion of described imaginary area.
8. electronic watch according to claim 7 is characterized in that,
Described zone and described imaginary area are divided into rectangular shape.
9. the time difference correction method of an electronic watch, this electronic watch has: acceptance division, it receives the satellite-signal from the positional information satellite transmission, obtains satellite information from the described satellite-signal that is received; Display part, it shows inner time information; And storage part, its storage defines the time difference information that obtains to each time difference in a plurality of zones, described a plurality of zone is cut apart geography information and is obtained, and the time difference correction method of this electronic watch is characterised in that the time difference correction method of this electronic watch comprises:
Obtain the step of described satellite information by described acceptance division;
The satellite searching step carries out following processing: retrieve the described positional information satellite that can catch according to the described satellite-signal that is received, and catch the described positional information satellite that retrieves;
The location calculation procedure, from the described positional information satellite of described satellite searching step, catching, select the described positional information satellite of stated number, calculate according to carry out location at the described satellite information that from the described satellite-signal of selected described positional information satellite transmission, comprises, generate positional information;
Step according to described positional information calculation imaginary positions zone;
Time difference determination step judges according to described time difference information whether described imaginary positions zone comprises time difference boundary; And
Carry out the step of following processing: do not comprise under the situation of time difference boundary being judged to be described imaginary positions zone, revise described inner time information according to the time difference in described imaginary positions zone, described acceptance division finishes the reception of described satellite-signal,
In described location calculation procedure, comprise under the situation of time difference boundary being judged to be described imaginary positions zone, reselect the described positional information satellite of described stated number, proceed described location and calculate.
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