CN105739297A

CN105739297A - Wavecepter and date and time information acquisition method

Info

Publication number: CN105739297A
Application number: CN201510984596.8A
Authority: CN
Inventors: 松江刚志; 阿部英雄; 阿部和明
Original assignee: Casio Computer Co Ltd
Current assignee: Casio Computer Co Ltd
Priority date: 2014-12-24
Filing date: 2015-12-24
Publication date: 2016-07-06
Anticipated expiration: 2035-12-24
Also published as: JP2016121984A; CN105739297B; JP6610010B2

Abstract

The invention provides a wavecepter and a date and time information acquisition method. The wavecepter comprises a radio wave receiving unit for receiving satellite radio waves, and sequentially identifying codes encoded in a format corresponding to the received satellite radio waves; and a processing unit for generating a hypothetical code string for received code strings that is pre-imagined as one part of to-be-identified codes. The codes of the hypothetical code string are compared with the codes of received code strings, so that one received code string with the matching degree thereof with the hypothetical code string to meet a predetermined reference condition can be detected. Meanwhile, the date and the time can be obtained based on the matching time of the codes of the received code string that meets the predetermined reference condition.

Description

Wave timepiece and date-time information acquisition method

Technical field

The present invention relates to a kind of Wave timepiece and date-time information acquisition method.

Background technology

At present, there is the electronic watch (Wave timepiece) of following function: by receiving from GNSS (GlobalNavigationSatelliteSystem, Global Navigation System) involved by the electric wave of aeronautical satellite (location satellite) carry out date of acquisition temporal information, thus keeping the date-time of counting exactly.In this Wave timepiece, it is not necessary to the manual operation of user, additionally, the date-time of counting, display can both be kept exactly all over the world.

But, satellite waves receive the load that involved load is involved with the counting of the date-time in electronic watch or display compared with very big, the reception of satellite waves corresponding is existed the maximization causing battery and the maximization of size of electronic watch together with it, weight increases relevant problem.Therefore, the various technology for reducing power consumption it are currently being deployed.

As such for one of technology reducing power consumption, there is the shortening electric wave reception time.Such as, following technology disclosed in the Japanese documentation and Japanese Unexamined Patent Publication 2009-36748 publication: receive the predetermined portions comprising date-time information according to the signal format (navigation message) sent from gps satellite, suspends in the period sending unwanted information and receives.Now, in order to avoid distinguishing of date-time by mistake, obtain and the odd and even data corresponding to the brick comprising above-mentioned predetermined portions the integration confirming to receive data.

But, when electric wave reception intensity reception environment such as low grade is bad, sometimes partially produce by mistake distinguishing of coding.In this case, needs are avoided obtaining inaccurate date-time, on the other hand, if proceeding to receive until judging that all sequence obtained are correct, then there are the following problems: receives the time elongated, and the acquirement efficiency of date-time information reduces and increases unwanted power consumption.

Summary of the invention

The present invention relates to and a kind of can more effectively obtain the Wave timepiece of date-time information, date-time information acquisition method and program accurately.

To achieve these goals, the present invention provides a kind of Wave timepiece, possesses:

Electric wave reception portion, it receives satellite waves, distinguishes each coding with being encoded of form corresponding to this satellite waves received successively；And

Process portion, it generates the imaginary sequence of the reception sequence that the part in the arrangement being assumed to be the coding distinguished described in carrying out in advance is constituted, compare each coding of described imagination sequence and each coding of described reception sequence, the matching degree of detection and described imagination sequence meets the described reception sequence of predetermined base condition, and according to receiving the match time of the described coding forming the described reception sequence meeting described predetermined base condition, date of acquisition time.

Accompanying drawing explanation

Fig. 1 indicates that the block diagram of the electronic watch of embodiments of the present invention.

Fig. 2 is the figure that the navigation message format sent from gps satellite is illustrated.

Fig. 3 is the figure of the evolution of the inconsistent number schematically showing imagination sequence and reception sequence.

Fig. 4 indicates that the flow chart of the control process that date-time acquirement processes.

Fig. 5 indicates that the flow chart of the control process that date-time information reception processes.

Fig. 6 indicates that the flow chart of the variation 1 of the control process that date-time information reception processes.

Fig. 7 indicates that the flow chart of the variation 2 of the control process that date-time information reception processes.

Fig. 8 indicates that the flow chart of the control process that intermittent reception processes.

Fig. 9 indicate that the date-time information reception process of variation 2 and intermittent reception process in the figure of example of reception period.

Detailed description of the invention

Hereinafter, with reference to the accompanying drawings embodiments of the present invention are illustrated.

Fig. 1 indicates that the block diagram of the functional structure of the positioning apparatus of the present invention and the embodiment of Wave timepiece and electronic watch 1.

This electronic watch 1 is at least enough to receive the GPS (GlobalPositioningSystem from the U.S., global positioning system) involved by the electric wave (satellite waves) of location satellite (hereinafter referred to as gps satellite) carry out the Wave timepiece of date of acquisition temporal information.

Wave timepiece 1 possesses host CPU (CentralProcessingUnit, CPU) 41, ROM (ReadOnlyMemory, read only memory) 42, RAM (RandomAccessMemory, random access memory) 43, oscillating circuit 44, frequency dividing circuit 45, as the timing circuit 46 of timing unit, display part 47, display driver 48, operating portion 49, power supply unit 50, satellite waves reception processing unit 60 and antenna AN etc..

Host CPU 41 carries out various calculation process, is uniformly controlled the molar behavior of Wave timepiece 1.Host CPU 41 reads control program from ROM42, and is loaded in RAM43, carries out the display of date-time, the various actions such as operation control that various function relates to or display process.Additionally, host CPU 41 makes satellite waves reception processing unit 60 action receive the electric wave from location satellite, obtain according to receiving date-time information, the positional information that content is obtained.

ROM42 is the MaskROM nonvolatile memory etc. maybe can rewritten, storing control program or initially setting data.Control program includes the program 421 involved by control of the various process for obtaining various information from location satellite.

RAM43 is the volatile memory such as SRAM or DRAM, provides operation memory space to store ephemeral data to host CPU 41, and stores various setting data.Various setting datas include the city, place of electronic watch 1 and set, whether apply the setting of daylight-saving time in the counting of date-time, display.Part or all of the various setting datas in RAM43 can also be will be stored in store in the nonvolatile memory.

Oscillating circuit 44 generates and exports the predetermined frequency signal predetermined.Such as, this oscillating circuit 44 uses crystal oscillator.

Output after the frequency signal that the frequency signal inputted from oscillating circuit 44 frequency dividing is utilized for timing circuit 46, host CPU 41 by frequency dividing circuit 45.Can also according to the frequency setting this output signal of change of host CPU 41.

Timing circuit 46 counts the input number of times of the predetermined frequency signal (clock signal) from frequency dividing circuit 45 input and is added to initial value to count current date-time.Both the circuit of the value change that software makes RAM store had been can be through as timing circuit 46, or, it is also possible to possess special timing circuit.The date-time of timing circuit 46 counting is not limited especially, be any one in the date-time (local time) etc. in the accumulated time started the scheduled time or UTC date-time (world concordant time) or city, place set in advance.Additionally, not necessarily need to preserve the date-time of this timing circuit 46 counting itself with the form of date, Hour Minute Second.The clock signal being input to timing circuit 46 from frequency dividing circuit 45 has some deviations compared with correct time process, and the inclined extent (step number) of every day is according to operating environment, for instance change according to temperature, generally within ± 0.5 second.

Display part 47 such as possesses liquid crystal display (LCD) or organic EL (Electro-Luminescent, electroluminescent) the display picture such as display, carry out the numerical monitor action involved by date-time, various function by certain in dot matrix way and segment encode (segment) mode or their combination.

The driving signal corresponding with the kind of display picture is exported display part 47 according to the control signal from host CPU 41 by display driver 48, displays on display picture.

Operating portion 49 accepts the input operation from user, and as input signal, the signal of telecommunication corresponding with this input operation is exported host CPU 41.Such as, this operating portion 49 includes press button or table hat switch.

Or, touch sensor it is provided with overlappingly with the display picture of display part 47, can also pass through to make display picture as touch panel function to the corresponding operation signal of the detection of the contact position involved by the contact action of this touch sensor or the way of contact of output and user, display part 47 and operating portion 49 are set to one.

Power supply unit 50 possesses battery, with predetermined voltage to each portion supply Wave timepiece 1 action involved by electric power.As the battery of power supply unit 50, use solar panel and secondary cell at this.Solar panel produces electromotive force by incident light and carries out power supply to each portions such as host CPUs 41, and when creating dump power, by this electric power electric power storage to secondary cell.On the other hand, when because causing the electric power that can generate electricity relative to power consumption deficiency externally to the incident light quantity of solar panel, electric power is supplied from secondary cell.Or, the one-shot battery of coin shape etc. can also be used as battery.

Satellite waves reception processing unit 60 receives this electric wave via antenna AN with the C/A code (pseudo noise) distinguished with tune from the electric wave of location satellite, catch each location satellite intrinsic, and the navigation message that location satellite is sent is demodulated, decode and obtain necessary information.Satellite waves reception processing unit 60 possesses module CPU61 (imagination sequence generating unit 611, matching detection portion 612, date-time obtaining section 613), memorizer 62, storage part 63, RF portion 64, baseband conversion portion 65 and catches tracking portion 66 etc..Module CPU61 includes imagination sequence generating unit 611, matching detection portion 612, date-time obtaining section 613.These imagination sequence generating unit 611, matching detection portion 612, date-time obtaining sections 613 both can be single CPU, it is also possible to be each respectively provided with CPU to carry out each action, it is also possible to carry out each action by host CPU 41.

Module CPU61 is according to the action controlling satellite waves reception processing unit 60 from the control signal of host CPU 41 or the input of setting data.Module CPU61 reads program or the setting data of necessity from storage part 63, makes RF portion 64, baseband conversion portion 65 and catches tracking portion 66 action, receives and demodulates the received electric wave from each location satellite and carry out date of acquisition temporal information.This module CPU61, except the electric wave received is decoded date of acquisition temporal information, is not decoded and is compared to carry out matching detection to the reception sequence after demodulating, distinguishing and comparative control sequence set in advance (comparison sequence).

Memorizer 62 is the RAM providing operation storage space to the module CPU61 in satellite waves reception processing unit 60.Additionally, keep in the sequence data being generated as the comparative control with received sequence in memorizer 62.

Storage part 63 stores the various setting datas involved by GPS location or location history.Storage part 63 uses the various nonvolatile memories such as flash memories or EEPROM (ElectricallyErasableandProgrammableReadOnlyMemory, Electrically Erasable Read Only Memory).The data being stored in storage part 63 include the orbit information (ephemeris) of each location satellite, predicted orbit information (almanac) or the location date-time of last time and position.Additionally, in storage part 63, the data involved by the implementation information of time zone all over the world or daylight-saving time are stored as time chart.When carrying out location, with reference to this time chart, it is determined that local time information such as the time difference of the standard time of the current location got and world concordant time (UTC) or daylight-saving time implementation informations.

Additionally, the data being stored in storage part 63 include program 631, historical store 632 and code storage portion 633.These programs 631, historical store 632 and code storage portion 633 both can be single storage parts, can also each be respectively provided with storage part, program 631 can also be comprised in the data in being stored in ROM42, the data in being stored in RAM43 comprise historical store 632 and code storage portion 633.When carrying out acquirement or the location of date-time information, this program 631 performs after being read by module CPU61.The code storage portion 633 distinguishing sequence (history sequence) data additionally, when performing this program 631, described with reference to the historical store 632 of the nearest reception history of storage and when storing this nearest reception.

RF portion 64 receives the satellite waves of L1 section (in gps satellite for 1.57542GHz), make from location satellite signal-selectivity by, amplify after be transformed to intermediate frequency signal.RF portion 64 includes LNA (low noise amplifier), BPF (band filter), local oscillator or blender etc..

The baseband conversion portion 65 intermediate frequency signal to being obtained by RF portion 64 is applied the C/A code of each location satellite and is obtained baseband signal, i.e. sequence (reception sequence) involved by navigation message (predetermined format).

Catch tracking portion 66 for the intermediate frequency signal obtained by RF portion 64, calculate correlation between the C/A code in each phase place of each location satellite respectively to determine its peak value, thus distinguish the signal from location satellite and its phase place that receive.Additionally, the C/A code catching the location satellite that tracking portion 66 picks out for basis continues to obtain the sequence from involved by the navigation message of this location satellite with its phase place, and baseband conversion portion 65 is carried out the feedback etc. of phase information.

Electric wave reception portion is constituted by these RF portions 64, baseband conversion portion 65 and seizure tracking portion 66.

This satellite waves reception processing unit 60 is directly supplied electric power from power supply unit 50, switches it by the control signal of host CPU 41 and opens and closes.That is, satellite waves reception processing unit 60 is beyond the period of the calculating action carrying out obtaining from the electric wave reception of location satellite and date-time or involved by location, closes power supply dividually with host CPU 41 grade of action all the time.In addition, in the satellite waves reception processing unit 60 of present embodiment, according to the offline mode that the electric wave in during the input operation of operating portion 49 can switch to the flight for limiting aircraft utilizes, in this offline mode, forbidden the power on of satellite waves reception processing unit 60 by host CPU 41.Or, in offline mode, it is also possible to only forbid the electric wave reception action of satellite waves reception processing unit 60.

Then, the form of the navigation message sent from gps satellite is illustrated.

In GNSS, by multiple location satellites are distributed on multiple tracks, it is set as the transmission electric wave being simultaneously able to receive that multiple different location satellite from ground each place, obtain from the information involved by the current location of this location satellite of this location satellite being able to receive that transmission or date-time information from the location satellites of more than 4 (during surface being hypothetically 3), thus obtaining data according to these, obtain time deviation namely from the difference in the propagation time (distance) of each location satellite, the position coordinates in three dimensions and date-time can be determined.

Status information being encoded in a predetermined format such as the information involved by date-time, the information involved by satellite position, satellite health status, sequence carries out spread spectrum by C/A code (pseudo noise) and is sent from location satellite.Each location system is determined, and these send form (navigation message format).

In GPS, send the frame data of the 30 seconds units adding up to 25 pages respectively from each gps satellite, thus export total data with the cycle of the amount of 12.5.In GPS, each gps satellite is used intrinsic C/A code, about this C/A code, under 1.023MHz, arrange 1023 codings (chip) and sent with the 1ms cycle.The internal clocking of the leading and gps satellite of this chip is Tong Bu, therefore by each gps satellite detects this phase offset, detects the delivery time.

Each frame data are made up of 5 subframes (6 seconds), and each subframe is sent the date-time information of this 6 seconds units with 6 second cycle (sending the cycle) and is independent of certain fixing sequence in transmission cycle.Each subframe is made up of 10 words (Word) (each 0.6 second, be followed successively by word 1～word 10).In all of subframe, word 1 is identical with the data form of word 2.In word 1, and then the fixing sequence of 8 bits and leading (Preamble) include the telemetry message (TLMMessage) of 14 bits, are configured with 6 bit odd and even datas across the integrity state mark (Integritystatusflag) of 1 bit and the reserved bits of 1 bit afterwards.In word 2, including the TOW-Count (also referred to as Z-count) of 17 bits in elapsed time and the and then caution sign of their each 1 bit and anti-false sign in the date-time information i.e. week representing above-mentioned 6 seconds units.Then, in word 2, it is shown that represent the subframe ID of 3 bits of subframe number (cycle numbering), 2 bit arrangement across odd and even data integration have the odd and even data of 6 bits.Subframe ID is similarly with the sequence (corresponding sequence part) that 6 second cycle (according to predetermined corresponding relation) changes with TOW-Count, therefore can utilize the conformability of these subframes ID and the TOW-Count as moment corresponding informance in the confirmation of date-time.

The later data of word 3 are different because of subframe.In the word 3 of subframe 1, include WN (week numbering) leading.Subframe 2,3 mainly includes ephemeris (Precise Orbit information), the part and subframe 5 of subframe 4 send almanac (predicted orbit information).

Then, the acquirement action of the date-time information in the electronic watch 1 of present embodiment is illustrated.

In the electronic watch 1 of present embodiment, generate, according to the sequence etc. of the date-time of timing circuit 46 counting or acquirement recently, the imaginary sequence being assumed to be reception in advance.Then, compare this sequence and receive successively and identified sequence (reception sequence), when individually detection matching degree meets the part of base condition, according to the reception time (match time) of the reception sequence of this detection, the time obtaining imagination date-time of this imagination sequence is distinguished.At this, base condition is determined as the inconsistent number of the coding that results of comparison comprises with in the time being different from the imaginary reception time, the inconsistent coding permutations with this inconsistent number occur and be obtained, compared with the probability that compares, become and the corresponding substantially low value such as the access times of electronic watch 1, frequency.

Receive sequence and distinguishing after the coding of the leading coded number to end (bit number) of imagination sequence, when often distinguishing the numbering of 1 bit, 1 the oldest bit replaced to this 1 bit and determines the coding that leading position has been offset, it is possible to gradually compareing with imagination sequence.Comparison can be undertaken by module CPU61 but it also may uses the hardware configuration of the matched filter catching tracking portion 66.Additionally, in advance longer sequence is distinguished, can carry out while the scope receiving sequence being offset in this sequence and imagination the compareing of sequence.In this case, it is also possible to store the leading reception time of this sequence, the consistent coding site according to detection with imagination sequence makes this reception time migration determine match time.

As the coding that can be used in imagination sequence, if schematically illustrating as leading or reserved bits fixing all the time coding, the coding of inverse operation can being carried out according to date-time, generally do not change as the flag bit such as caution sign or anti-false sign but changes as TOW-Count, WN or subframe ID, be likely in data use the coding that comes into question and after obtaining the up-to-date information such as telemetry message or predicted orbit information (almanac), in the short elapsed time, the coding of not imaginary renewal etc. respectively encodes part or all.In this case, imagination sequence needs not be the coding being all continuously transmitted, it is also possible to the coding skipping imagination difficulty is divided into multiple position and is set.For example, it is also possible in the 22nd bit (the lowermost position bit of subframe ID) from the 1st bit of word 1 to word 2, generate imagination sequence except last 6 bits (odd even) of word 1.

The reception state of last time can also be independent of or receive the fixing sequence of ground use or the flag bits such as interval.

Assume the maximum skew that can produce 0.5 second/day degree of timing circuit 46 described above, then within revising 6 days after date-time, the skew of date-time is assumed to be corresponding with the length of 1 sub-frame amount ± within 3 seconds.Therefore, in such scope, it is possible to TOW-Count that the subframe that imagination receives according to the date-time of timing circuit 46 comprises or the sequence of subframe ID.

Change if between the sequence short-term such as telemetry message or predicted orbit information (such as, less than 1 day), then typically not.Therefore, these sequence picked out when most recently received are stored in code storage portion 633 as history sequence, the comparison of the date-time of reception history according to the last time being stored in historical store 632 and timing circuit 46 counting and the kind judgement of each information can be utilized by elapsed time after the reception of last time that obtain etc., and can be suitably with.

Imagination sequence is more short more terminates at short notice to receive, in addition, distinguishing of the coding unrelated with date-time information counts minimizing, but in order to avoid distinguishing by mistake, namely in order to avoid the place different in the position occurring imagination sequence from imagination occurs that same or similar sequence is judged to consistent with imagination sequence, it is unsatisfactory for above-mentioned primary condition, it is desirable to length more than necessary length.At this, when each binary code probability random alignment with each 1/2 is for " 0 " or " 1 ", the probability (probability of appearance) by mistake distinguished corresponding to inconsistent number of each coding setting imagination sequence and each coding receiving sequence necessitates the upper limit (the inconsistent number of benchmark) of value (the 2nd reference value) inconsistent number below and the length of imaginary sequence in electronic watch 1.

Such as, it is 44C3/244=7.53 × 10-10 for the imaginary sequence of 44 bit lengths with the occurrence rate of the inconsistent coding permutations of 3 bits.Additionally, be 28C1/228=1.04 × 10-7 for the imaginary sequence of 28 bit lengths with the occurrence rate of the inconsistent coding permutations of 1 bit.

In the sequence of navigation message, dependency relation between different coding is absent from for multiple codings, therefore, when out of phase (the relative skew of coding site) compares imagination sequence and receives sequence, generally, expect that the coding of half degree is inconsistent.On the other hand, in the time that imagination sequence is consistent with receiving sequence, inconsistent several E of coding sharply reduce to " 0 " or minimum number, and the time tm therefore becoming below reference value Em by detecting inconsistent several E obtains the candidate of match time.This reference value Em is determined according to the occurrence rate with above-mentioned inconsistent coding permutations.Such as, the rate of will appear from is set to below 10-9, therefore as mentioned above, it is possible to the imaginary sequence for 44 bit lengths sets reference value Em=3.

Further, it is also possible to the estimation reception frequency according to life of product and satellite waves determines this occurrence rate, and determine length or the reference value Em of imagination sequence.

At this, when TOW-Count is near 0 (the whole of TOW-Count are encoded to " 0 ") or maximum (the whole of TOW-Count are encoded to " 1 "), if these sequence being used as part or all of imagination sequence, even if then when imagination sequence and reception sequence somewhat misplace, the repeating part at them encodes also consistent.Additionally, when TOW-Count etc. is periodic sequence (such as, the situation etc. that " 0 " and " 1 " alternatively arranges), in the dislocation of this periodic quantity, coding is consistent.Therefore, in this case, compared with common misaligned state, inconsistent number diminishes.Its result, the determining method according to imagination sequence, when there is dislocation, inconsistent number becomes less than reference value Em, it is possible to distinguish by mistake.

In the electronic watch 1 of present embodiment, start with after the compareing of imaginary sequence, after obtaining the candidate of match time, obtain predetermined number of bits further, in figure 3, during time Tr, distinguishing the period (comparing amplitude) of the coding of 5 bits two, specially offseting the leading position receiving sequence while obtaining inconsistent number from the leading position of imagination sequence ratio one by one.Then, the occurrence rate (the 1st probability of occurrence) of the inconsistent number (the 1st inconsistent number) in the alternate times of match time is calculated as, with at the ratio comparing the and then occurrence rate (the 2nd probability of occurrence) of the inconsistent number (the 2nd inconsistent number) of the 1st inconsistent number little (that is, by rear for leading position skew more than 1 minimum) in width, the risk factor by mistake distinguished.Then, when this risk factor when predetermined benchmark risk factor (the 1st reference value) below, it is judged that for correctly having detected match time, carry out the correction of date-time.

In this case, as mentioned above, even if can not when correct match time obtains with imagination encoding rate on all four reception sequence (inconsistent number is " 0 ") by imagination sequence, it is also possible to produce to be judged to the situation of match time.Therefore, when inconsistent number is " 0 ", after this occurrence rate is set to " 0 ", calculate risk factor, thus enable that risk factor becomes below benchmark risk factor.

Fig. 4 indicates that the flow chart of the control process of the host CPU 41 of the date-time acquirement process in the electronic watch 1 of present embodiment.

When detecting the user's exectorial input operation to operating portion 49 or meeting the conditions such as the time of reception predetermined or reception time, start this date-time acquirement process.

If the acquirement process of time Start Date, then host CPU 41 starts satellite waves reception processing unit 60 (step S101).Additionally, satellite waves reception processing unit 60 is sent expression by host CPU 41 obtains date-time information that object is the setting of date-time information and timing circuit 46 counting as primary data (step S102).Then, the data from satellite waves reception processing unit 60 to be received are waited to export.It addition, such to be received in, host CPU 41 can also make display part 47 display represent receive in objective.

The signals from satellite waves reception processing unit 60 to be received such as host CPU 41, date of acquisition time data (step S103).Afterwards, host CPU 41 makes satellite waves reception processing unit 60 stop (step S104), and the date-time of timing circuit 46 counting is modified (step S105).Additionally, host CPU 41 is more newly stored in the reception history (step S106) in RAM43.Then, host CPU 41 time Close Date acquirement process.

Fig. 5 indicates that the flow chart of the control process of the module CPU61 of the date-time information reception process in the electronic watch 1 of present embodiment.

Starting satellite waves reception processing unit 60 by host CPU 41, the acquirement object information exported from host CPU 41 in the process of step S102 starts this date-time information reception and processes when being date-time information.

If starting date-time information reception to process, then module CPU61 carries out initially setting or action verification.Module CPU61 obtains the date-time information of output the process of step S102 from host CPU 41, determines the content of the navigation message that should receive, and, determine the reception time started corresponding with this content or reception period (step S201).Now, module CPU61 can also obtain the reception time of last time from storage part 63, switches to common 3 words to receive according to the elapsed time after the reception time of this last time.

Module CPU61 generates the imaginary sequence (step S202) of the sequence part that should distinguish at the reception period determined.When changing length or the position of imagination sequence, module CPU61 obtains this change from storage part 63 and generates appropriate imaginary sequence.Module CPU61 started to receive the electric wave (step S203) from gps satellite in the appropriate time, caught the electric wave from gps satellite (step S204) being able to receive that.Module CPU61 is while to attempting against spread spectrum according to receiving the C/A code that the signal bias phase place that obtains of electric wave applies each gps satellite on one side, thus detecting, catching the signal from gps satellite.

If catching from the signal of gps satellite, then module CPU61 follows the tracks of this gps satellite and is demodulated, the sequence (reception sequence) (step S205) of acquirement reception data.Module CPU61 compares the imaginary sequence of the predetermined bit length corresponding with the arrangement width of imagination sequence in the reception data of this acquirement and this generation, inconsistent several E (step S206) of counting coding.Inconsistent several E of stored count together with temporal information.Module CPU61 differentiates that whether inconsistent several E are at below reference value Em (step S207).It is being determined as when below reference value Em (for "Yes" in step S207), this time is set as the candidate of match time by module CPU61, and inconsistent several E are assumed to be minimum inconsistent candidate number E0 (the 1st inconsistent number) (step S209).Afterwards, the process of module CPU61 is shifted to step S210.Being determined as inconsistent several E (being "No" in step S207) not when below reference value Em of coding, the process of module CPU61 is shifted to step S210.

Additionally, when being set with consistent candidate, the process of step S207 is newly determined as the results of comparison obtaining below reference value Em, for instance, only it is set as consistent candidate when the inconsistent number of new inconsistent number candidate more consistent with this is little by rewriting.Now, acquirement bit number and comparison number of times after the consistent candidate in the process of step S210 being set are initialized as " 0 ".

Or, in this case, module CPU61 can also stop the acquirement of the date-time of the comparison based on sequence, is changed to current date-time adquisitiones such as 3 words and receives.

If shifting to the process of step S210, then module CPU61 obtains the data of 5 bit quantity further after carrying out the setting of candidate match time, and discriminates whether to have carried out compareing (step S210) with each imagination sequence.When be determined as do not obtain, compare 5 bit quantity (for "No" in step S210), module CPU61 differentiate start from the period that imagination sequence is corresponding after whether carried out the comparison (step S211) that (the transmission cycle of 1 sub-frame amount) measures 6 seconds 6 seconds.When be determined as do not carry out 6 seconds amounts (in step S211 for "No"), the process of module CPU61 is shifted to step S213.

When be determined as carried out 6 seconds amounts (in step S211 for "Yes"), module CPU61 generates (namely be based on the moment that send week after date of subframe) the imagination coding permutations corresponding with next subframe and updates (step S212).Afterwards, the process of module CPU61 is shifted to step S213.

If shifting to the process of step S213, then whether module CPU61 differentiation have passed through time-out time (step S213) after starting from reception.Time-out time is set to the predetermined quantity etc. of subframe lengths, in addition it is also possible to according to receive start time battery capacity or from last time receive after elapsed time etc. be properly carried out change.When being determined as not past time-out time (for "No" in step S213), the process of module CPU61 returns to step S205, proceeds to receive the acquirement of data.When be determined as have passed through time-out time (in step S213 for "Yes"), the process of module CPU61 is shifted to step S225.

In the differentiation of step S210 processes, candidate in match time obtains the data of 5 bit quantity after setting, it is determined as when having compareed with each imagination sequence (for "Yes" in step S210), module CPU61 is from reception (when having been carried out the comparison of more than 6 seconds, such as, nearest 6 seconds) terminate to these 5 times comparisons, the inconsistent number that second is little is set as several E2 less consistent (the 2nd inconsistent number) (step S221).Module CPU61 calculate respectively with acquired minimum inconsistent candidate number E0, than inconsistent corresponding for several E2 occurrence rate P0, P2 (step S222).

Whether module CPU61 differentiates by the ratio P0/P2 of occurrence rate P0, P2 risk factor Pd obtained at below benchmark risk factor Pm (step S223).Being determined as (for "No" in step S223) not when below benchmark risk factor Pm (more than benchmark risk factor Pm), the setting post processing that module CPU61 removes involved by consistent candidate returns to step S205.

It is being determined as when below benchmark risk factor Pm (for "Yes" in step S223), the candidate of this match time is formally set as match time by module CPU61, imaginary date received time and this match time according to imagination sequence set formal date-time, adjust the time and export host CPU 41 (step S224).Module CPU61 terminates the electric wave reception (step S225) from gps satellite, and Close Date temporal information reception processes.

[variation 1]

Fig. 6 indicates that the flow chart of the variation 1 that date-time information reception processes.

In the date-time information reception of this variation 1 processes, the process of the step S207 date-time information acquirement in above-mentioned embodiment processed is changed to the process of step S207a, add the process of step S208, in addition, except the point of the process of delete step S221～S223 identical, give same-sign omitting the description to same treatment content.

In the date-time information reception of this variation 1 processes, TOW-Count and subframe ID must be comprised in imagination sequence.

In this date-time information reception processes, after module CPU61 comparison receives each coding (step S206) of sequence and imagination sequence, differentiate that whether inconsistent several E is at below reference value Em, and when being set with minimum inconsistent candidate number E0, it determines whether inconsistent several E are at this minimum inconsistent candidate below number E0 (step S207a).When at below reference value Em, and when not setting or be set with minimum inconsistent candidate number E0, it is determined as at minimum inconsistent candidate below number E0 (for "Yes" in step S207a), and, it determines certain bit of inconsistent lower 2 figure places whether comprising TOW-Count and any one (step S208) certain bit (starting the coding of at least predetermined number from lowermost position bit) of subframe ID3 figure place.When be determined as comprise any bit (in step S208 for "Yes"), the process of module CPU61 is shifted to step S210.When be determined as do not comprise any bit (in step S208 for "No"), the process of module CPU61 is shifted to step S209.

If being determined as inconsistent several E not at below reference value Em, or when being set with minimum inconsistent candidate number E0 not at this minimum inconsistent candidate number E0 (for "No" in step S207a), the process of module CPU61 is shifted to step S210.

And, now when lower 2 figure places of TOW-Count synchronously become inconsistent with subframe ID, as there is the probability receiving the subframe different from the subframe involved by imaginary date-time, both can pass through to update imagination sequence corresponding to the date-time of this TOW-Count and subframe ID, it is also possible to process is changed to 3 words and receives.

In addition, not only to TOW-Count or subframe ID, for the various marks such as caution sign when receive in sequence comprise represent be not " 1 " of usual state (abnormal etc.) and become inconsistent, the inconsistent number being independent of entirety waits other conditions to carry out later process as not consistent with imaginary sequence process.

[variation 2]

Then, the variation 2 date-time information reception processed illustrates.

As mentioned above, substantially carry out and imagination the compareing of sequence, although being set with minimum inconsistent candidate number E0 (especially, the situation of more than 1), but by representing that the arrangement of the TOW-Count of current time of day etc. generates the sequence similar with imagination sequence, several E2 less consistent will not become sufficiently large, and risk factor Pd becomes sometimes will not be less than benchmark risk factor Pm.In the date-time information reception of this variation 2 processes, it is achieved the reduction obtaining improvement and power consumption of the current time of day in this situation.

In the date-time information reception of this variation processes, module CPU61 is as receiving control portion function.

Fig. 7 indicates that the flow chart of the variation 2 that date-time information reception processes.

In the date-time information reception of this variation 2 processes, identical except having added the process of step S231～S235 to the date-time information acquirement in above-mentioned embodiment in processing, give same-sign to same treatment content and omit the description.

If updating imagination sequence in the process of step S212, then module CPU61 between nearest 6 seconds (1 periodic quantity of subframe before) discriminates whether to be set with minimum inconsistent candidate number E0 (step S231).When be determined as do not set (in step S231 for "No"), the process of module CPU61 is shifted to step S213.When be determined as set (in step S231 for "Yes"), module CPU61 will be set as minimum inconsistent candidate number E0, several E2 less consistent and with reference to inconsistent several E3 (the 3rd inconsistent number) (step S232) according to 3 numbers of inconsistent number order from small to large between nearest 6 seconds.At this, set repeatedly (such as, 2 times) minimum inconsistent candidate number E0 and all without, when meeting the condition of step S223, minima therein being set as again minimum inconsistent several E0, the second little value becomes several E2 less consistent.Module CPU61, according to minimum inconsistent candidate number E0, several E2 less consistent and with reference to inconsistent several E3, calculates occurrence rate P0, P2, P3 (the 3rd probability of occurrence) (step S233) respectively.

Whether module CPU61 differentiates according to the P0/P2 risk factor Pd obtained at below benchmark risk factor Pm, and at 10-3 (the 2nd reference value) below (step S234) whether P2/P3.When be determined as be unsatisfactory for any one (in step S234 for "No"), the process of module CPU61 is shifted to step S213.When all meeting (for "Yes" in step S234), module CPU61 calls intermittent reception and processes and perform (step S235), and afterwards, Close Date temporal information reception processes.

Fig. 8 indicates that the flow chart of the control process of the intermittent reception process called in the date-time information reception of this variation processes.

If calling intermittent reception in the process of step S235 to process, module CPU61 makes GPS receiver interrupt (step S301).The module CPU61 differentiation reception elapsed time (or, the current time of day of date-time based on timing circuit 46 counting) whether be currently be assumed to be in the subframe of reception, the reception period of the sequence part (the 1st receives sequence) obtaining minimum inconsistent candidate number E0 between 6 seconds of 1 periodic quantity of subframe before or the sequence part (the 2nd receives sequence) obtaining several E2 less consistent, namely before subframe in 6 seconds of this sequence part after certain time (step S302).In the situation that is determined as that all no (for "No" in step S302), module CPU61 repeats the process of step S302.

(for "Yes" in step S302) in the reception period being determined as the minimum inconsistent candidate number E0 in being current 1 cycle of subframe and the sequence part corresponding at least one party in several E2 less consistent, module CPU61 restarts the electric wave reception (step S303) from gps satellite.Module CPU61 follows the tracks of the electric wave from gps satellite received in electric wave, obtains the reception data (step S304) of the sequence after representing demodulation.

Module CPU61 differentiation is the reception period (step S305) of any one the corresponding sequence part in minimum inconsistent candidate number E0 and several E2 less consistent.When being determined as the reception period being at least the sequence part corresponding with any one (for "No" in step S305), the process of module CPU61 returns to step S304.When be determined as be not the reception period of any one sequence part (for "Yes" in step S305), module CPU61 terminates the electric wave reception (step S306) from gps satellite.

It addition, the reception period in this decision is not required to exactly the same with the reception time of the sequence part calculated by minimum inconsistent candidate number E0 or several E2 less consistent in each period of sub-frame, it is possible to be widely set as required to comprise these time.

Module CPU61 differentiates whether the reception of the reception period involved by minimum inconsistent candidate number E0 and several E2 less consistent all terminates (step S307).Reception at the reception period being determined as the sequence part corresponding with any one inconsistent number is not in situation (for "No" in step S307), and the process of module CPU61 returns to step S302.When the reception in being determined as any one reception period all terminates (for "Yes" in step S307), inconsistent number little to minimum inconsistent number in reception period and second is respectively set as new minimum inconsistent candidate number E0 and several E2 less consistent by module CPU61, and calculates occurrence rate P0, P2 (step S308) respectively according to these.

It addition, just in case when having exchanged the sequence part corresponding to minimum inconsistent candidate number E0 and the sequence part corresponding to several E2 less consistent, it is also possible to it is set with directly exchanging.Additionally, when widely setting reception period, module CPU61 can also carry out compareing for the whole sequence parts in this reception period, the setting of minimum inconsistent candidate number E0 and several E2 less consistent.

Module CPU61 differentiates that whether risk factor Pd is at below benchmark risk factor Pm (step S309).When being determined as when below benchmark risk factor Pm (for "No" in step S309), module CPU61 discriminates whether to have passed through time-out time (step S311), when be determined as not past (in step S311 for "No"), process and return to step S302.When being determined as process (for "Yes" in step S311), module CPU61 terminates intermittent reception and processes, and makes process return to date-time information reception and processes, and direct Close Date temporal information reception processes.

Risk factor Pd it is determined as when below benchmark risk factor Pm (for "Yes" in step S309) in the differentiation of step S309 processes, module CPU61 obtains the date-time corresponding with imagination sequence, and set its time, in this time to host CPU 41 output date temporal information (step S310).Then, module CPU61 terminates intermittent reception process.

Fig. 9 indicates that the figure of the example of the reception period in this variation.

Module CPU61 starts to receive (step S203) after the initial generation (step S202) setting (step S201) and imagination sequence.Then, if capturing gps satellite (step S204), then module CPU61 starts to receive the acquirement (step S205) of data, starts the comparison (step S206) starting successively to receive sequence and imagination sequence from moment t0.

If moment t1s～t1e being set as the reception time (step S207, S209) involved by minimum inconsistent candidate number E0, after this setting, then distinguish 5 codings the moment t2 (for "Yes" in step S210) compareed, set several E2 less consistent and corresponding reception period t3s～t3e (step S221), compare risk factor Pd and benchmark risk factor Pm (step S222, S223).When risk factor Pd (step S223 being "No") not when below benchmark risk factor Pm, module CPU61 returns to the process of step S205, moment t4 after 6 seconds (for "Yes" in step S211) after starting from comparison, update imagination sequence (step S212), and step S231 difference be "Yes" to determine several E2 less consistent and during it in (reception period t3s～t3e) and reception period t5s～t5e with reference to inconsistent several E3 (step S232).That is, the reception (period at moment t0～moment t4 that the 1st cycle represented with transverse direction thick line) in the 1st cycle now is proceeded till carrying out the comparison of 6 seconds amounts.

It addition, the period of several E2 less consistent can also be different from the moment t2 reception period determined.Additionally, reception period t1s～t1e and reception period t3s～t3e can also partly overlap.

Calculating occurrence rate P0, P2, P3 (step S233), when they meet the criterion of step S234 (for "Yes" in step S234), the process of module CPU61 is shifted to step S235, calls intermittent reception and processes.After the 2nd cycle, module CPU61 interrupts from the electric wave reception (step S301) of gps satellite, is only received action (step S302～S307) at the reception period t7s～t7e corresponding to the minimum inconsistent candidate number E0 in this cycle and the reception period t6s～t6e corresponding to several E2 less consistent (in " the 2nd cycle～").

Reception two periods terminate after moment t7e (in step S307 for "Yes"), module CPU61 resets minimum inconsistent candidate number E0 and several E2 less consistent and calculates occurrence rate P0, P2 (step S308) respectively.Then, when risk factor Pd (step S309 being "Yes") when below benchmark risk factor Pm, it is determined that in reception period t7s～t7e detection imagination sequence, date of acquisition time (step S310).

So, when the arrangement of coding picking out low with the certainty of the imagination not quite identical reception sequence of sequence, in next period of sub-frame, only carry out the reception of this uniform portion and rating unit, only carry out the checking based on imagination sequence and the certainty of the change receiving sequence, it is possible to improve receiving efficiency.

Receive satellite waves as it has been described above, the electronic watch 1 of present embodiment possesses and distinguish the RF portion 64 of satellite waves reception processing unit 60 of each coding of being encoded of form with the navigation message corresponding with the satellite waves that this receives, baseband conversion portion 65 successively and catch tracking portion 66, module CPU61；Module CPU61 generates as imagination sequence generating unit 611 and is assumed to be the reception sequence being made up of the license part in identified coding permutations in advance, compare each coding of imagination sequence as matching detection portion 612 and receive each coding of sequence, the matching degree of detection and imagination sequence meets the reception sequence of predetermined base condition, as date-time obtaining section 613, according to date of acquisition time match time receiving the coding forming the reception sequence meeting predetermined benchmark.

Such that make can not distinguish to entirely accurate because of electric wave reception situation difference etc. all numbering when, it is also possible to judge whether achieve sequence accurately in the reception time of short time, therefore, it is possible to more effectively obtain date-time information accurately.

Additionally, by previously generating imagination sequence and carrying out compareing and obtain date-time accurately, the time that this reception sequence is decoded thus can be cut down after the receipt, promptly determines date-time.

Additionally, the inconsistent of each coding broken forth is counted the described matching degree of decision according between reception sequence and imagination sequence, therefore can be made whether to pick out exactly the judgement of sequence according to being easy to process.

In addition, base condition involved by matching detection is determined as the minimum inconsistent candidate number E0 that the inconsistent number according to each coding compareed between imagination sequence becomes the reception sequence of more than predetermined upper limit value, relative to imagination sequence by receive the leading position of sequence from the position obtaining minimum inconsistent candidate number E0 with predetermined comparison after width (starting to rear 5 codings of the position obtaining minimum inconsistent candidate number E0 from comparison) skew each inconsistent number in several E2 minimum less consistent, value that occurrence rate P0 obtains divided by occurrence rate P2 and risk factor Pd are at below the benchmark risk factor Pm predetermined, wherein, occurrence rate P0 is that the sequence becoming minimum inconsistent candidate number E0 relative to imaginary sequence appears as the probability receiving sequence；Occurrence rate P2 is that the sequence becoming several E2 less consistent relative to imaginary sequence appears as the probability receiving sequence.

Namely, it is not only merely because matching degree is high, when relative to other receive sequence matching degrees insufficient high, imagination sequence can not be judged to consistent with receiving sequence, therefore, it is possible to avoid in TOW-Count etc. in identical coding continuous print date-time, even if not being original match time, but when matching degree uprises, is judged to the situation of match time the time of mistake.

Additionally, imagination binary system occurs obtaining above-mentioned occurrence rate P0 and occurrence rate P2 with the probability of 1/2 respectively in constituting each binary code receiving sequence, therefore, it is possible to suppress the strict time calculated meanwhile, it is capable to substantially suppress deterioration in accuracy.

nullIn addition，In the date-time reception of variation 2 processes，With the minimum inconsistent candidate number E0 obtaining below reference value Em according to the transmission cycle of the format determination of navigation message (when gps satellite for the transmission cycle of subframe)，And the value that occurrence rate P0 obtains divided by occurrence rate P2 is not when below benchmark risk factor Pm，As receive control portion module CPU61 in each transmission cycle，Comprising the sequence part corresponding to minimum inconsistent candidate number E0、For the risk factor Pd of occurrence rate P0 of this minimum inconsistent candidate number E0 not in the sequence part corresponding to the occurrence rate of below benchmark risk factor Pm、At least to the period of a part for sequence part relevant for several E2 less consistent，Make the RF portion 64 of satellite waves reception processing unit 60、Baseband conversion portion 65 and seizure tracking portion 66 are received；As the module CPU61 in matching detection portion 612 by least compareing with several E2 less consistent with minimum inconsistent sequence part corresponding for candidate number E0 in reception sequence interior during imagination sequence and this part, detect the reception sequence meeting above-mentioned predetermined base condition.

Therefore, although having picked out the reception sequence substantially uniform with imagination sequence, but in the arrangement of coding several E2 less consistent constant big, identified go out the certainty of position low, after next period of sub-frame, only carrying out the reception of this uniform portion and rating unit, imagination sequence only carries out the checking of certainty with receiving sequence change, it is possible to reduce the power consumption involved by receiving, and can carry out identified go out the confirmation of position such that it is able to improve receiving efficiency.

In addition, as receive the module CPU61 in control portion when receive the leading position of sequence from the position obtaining minimum inconsistent candidate number E0 above-mentioned compare width bias internal each inconsistent number the second little occurrence rate P3 with reference to inconsistent several E3 frequently make a reservation for the 2nd reference value with occurrence rate P2 phase big, at this, when bigger than 103, by the RF portion 64 of satellite waves reception processing unit 60, baseband conversion portion 65 and seizure tracking portion 66, it is received with minimum inconsistent sequence part corresponding for candidate number E0 and the period with sequence part corresponding for several E2 less consistent comprising.

So, several E2 less consistent receives, relative to other except minimum inconsistent candidate number E0, the minimum that the inconsistent number involved by sequence becomes fully little, therefore once in a while when other positions produce the sequence part similar with imagination sequence in receiving sequence, the position that sequence part like such is consistent with imagination sequence exactly as long as really admitting a fault after next period of sub-frame, then do not carry out needing above reception or comparison, therefore, it is possible to effectively, positively detect the reception sequence consistent with imagination sequence.

Additionally, the ratio according to the occurrence rate P3 relative to occurrence rate P2 determines the 2nd reference value, therefore, it is possible to fully get rid of the probability of the accurately position consistent with imagination sequence of the sequence part beyond the sequence part corresponding to several E2 less consistent.

Additionally, on the other hand, determine base condition according to the upper limit of inconsistent number, therefore, it is possible to do not use division arithmetic etc. and obtain match time accurately by simple differentiation process.

In addition, now, using relative to imagination sequence become this upper limit inconsistent number coding arrangement as receive sequence occur probability less than the upper limit determining inconsistent number in the way of the 3rd reference value predetermined, thus according to the life-span or purposes etc. of product, the probability by mistake distinguished is converged in predetermined scope rightly.

Additionally, imagination binary system occurs obtaining above-mentioned probability of occurrence with the probability of 1/2 respectively in forming each binary code receiving sequence, therefore in the same manner as above-mentioned occurrence rate P0 and occurrence rate P2, it is possible to suppress deterioration in accuracy while suppressing the strict time calculated.

In addition, possesses the timing circuit 46 to date-time counting, module CPU61 as imagination sequence generating unit 611 generates in the TOW-Count corresponding to each current time being updated according to the transmission cycle (when gps satellite for the transmission cycle of subframe) of navigation message format decision or subframe ID according to the date-time that timing circuit 46 counts, start to include at least the imaginary sequence of the coding of predetermined number from bit side, lowermost position, therefore skew can positively be detected in the time of reception with in the situation of this transmission cycle (subframe) unit offset etc., in addition, side-play amount can be estimated.

In addition, module CPU61 as matching detection portion 612 in imagination sequence and receives in each coding compareed between sequence, the coding corresponding with this moment is deposited in the case of inconsistencies, considering that the probability of the skew under such transmission cycle unit is judged as that the matching degree receiving sequence and imagination sequence is unsatisfactory for predetermined base condition, the inaccurate date-time that it is possible to prevent outside imagination obtains.

In addition, as the module CPU61 of imagination sequence generating unit 611 in the matching degree carrying out offseting in the scope corresponding to offset amplitudes more than 300 bit numbers of subframe lengths by the leading coding site of the receptions sequence corresponding with the leading coding site of imagination sequence and obtain all without, when meeting predetermined base condition, updating imaginary sequence with date-time information change accordingly for imaginary value in next subframe.Therefore, in this subframe, become consistent in the time that reception state is excessively poor, even if when not carrying out the detection of this match time, it is also possible to imagination detects rightly in next subframe.

In addition, it is included in the ground such as fixing sequence that each period of sub-frame determined according to navigation message format sends and leading or reserved bits as the module CPU61 of imagination sequence generating unit 611 and generates imagination sequence, therefore it is independent of receiving interval and can being easily used in imagination sequence, in addition, prolongation bit length can be used in, therefore, it is possible to reduce the probability distinguished by mistake.In addition, about such fixing sequence, in imagination sequence with receive position leading in sequence less than when should fix the length of sequence and be different, inconsistent bit number is many, therefore will not rise with the probability distinguished according to date-time in the compareing of TOW-Count etc. by mistake.

Additionally, possess: historical store 63, the reception history of the satellite waves that its storage is nearest；And code storage portion 633, it will be stored as history sequence by the sequence that nearest satellite waves reception obtains, as the module CPU61 of imagination sequence generating unit 611 by will not being included at least partially in imagination sequence of part of kind change of information involved by history sequence within the elapsed time after the nearest satellite waves received in history sequence.So, the information that might not predict sequence for remote measurement word or predicted orbit information etc. but can not imaginary change at short notice, being stored in code storage portion 633 and be used in imagination sequence, the code length that it is possible to easily extend imagination sequence reduces the probability by mistake distinguished.

Additionally, send satellite waves from gps satellite, in history sequence, comprise telemetry message, therefore as described above at short notice can not the information of change of imagination sequence, it is possible to effectively make the bit length of imagination sequence extend 14 bit quantity.

In addition, when inconsistent with the coding receiving sequence, imagination sequence comprises the mark etc. being judged as being unsatisfactory for predetermined base condition as the module CPU61 in matching detection portion 612, therefore when create from gps satellite when sending abnormal etc., it is possible to do not carry out generally such process.

In addition, imagination sequence comprise along with the change of date-time produces at least some of of the TOW-Count and subframe ID of same change, as the module CPU61 in matching detection portion 612 when the sequence part corresponding with these is by becoming inconsistent with reception sequence with the value corresponding to change of date-time simultaneously, it is judged that for being unsatisfactory for predetermined benchmark.Therefore, even if meeting inconsistent number as entirety to wait other conditions, there is the probability of the problems such as the skew produced under subframe unit, therefore for safety switching to certain method of reseptance, it is possible to the generation preventing from by mistake distinguishing.

In addition, as imagination sequence generating unit 611 module CPU61 when TOW-Count and subframe ID according to the change of date-time become simultaneously with receive sequence inconsistent, it is possible to according to any one shown date-time of this inconsistent receptions sequence part, imaginary sequence is updated.So, when the probability of the skew under producing subframe unit, regenerate imagination sequence after embedding the skew under this subframe unit and carry out conforming judgement, it is possible to promptly carry out the acquirement of date-time accurately.

Additionally, by the adquisitiones using above-mentioned date-time information, use multiple electronic equipment and CPU inferior to the situation carrying out the acquirement of date-time, similarly can carry out the acquirement of efficiently and accurately date-time information simultaneously.

In addition, program corresponding to the adquisitiones of above-mentioned date-time information is loaded into and is able to receive that in the electronic equipment of the satellite waves of location satellite and uses, it is possible to be undertaken by the electronic equipment that width is wide the acquirement of efficiently and accurately date-time information.

It addition, the invention is not limited in above-mentioned embodiment, it is possible to there is various change.

Such as, in the above-described embodiment, the structure carrying out the involved various process of date-time acquirement for module CPU61 is illustrated, but both can pass through host CPU 41 and carry out, or, it is also possible to shared by module CPU61 and host CPU 41 and carrying out partially.Additionally, accompany with it, it is also possible to part or all of nearest reception history or the sequence that receives is stored in RAM43 non-volatile memory portion etc., rather than is stored in the storage part 63 of satellite waves reception processing unit 60.

In addition it is also possible to change the length of imaginary sequence shown in the above-described embodiment according to condition.For example, it is also possible to the capacity according to battery shortens time-out time simultaneously.Such as, when elapsed time skew fully little, imaginary after the date received time of the last time obtained in step s 201 is several bit degree, distinguish that the leading probability as fixing sequence becomes non-normally low by mistake, therefore only set as imagination sequence that this is leading, use and receive sequence on all four date of acquisition time time.In this case, the process of step S202 sets the imaginary sequence than 8 tentative bit long, the electric wave reception intensity from gps satellite that only captures in step S204 is stronger than datum-plane, only imagination sequence is changed to leading.

It is equally possible that change the value of reference value Em according to other conditions such as receiving intensities.No matter the signal intensity of the electric wave from gps satellite captured in step S204 (S/N ratio) is sufficiently large, think that the probability by mistake distinguished producing a lot of coding is little, therefore along with S/N declines than rising reference value Em such that it is able to reduce and be characterized as the probability consistent with the similar sequence occurred in other positions by mistake.

In addition, in the above-described embodiment, for the situation of the ratio that uses occurrence rate P0, P2 with use the situation of minimum inconsistent candidate number E0 to be illustrated, but other determinating references can also be set, for instance be respectively provided with the minimum upper limit of inconsistent candidate number E0 and the lower limit of several E2 less consistent judges.

Additionally, in the above-described embodiment, after obtaining minimum inconsistent candidate number E0, obtain several E2 less consistent after obtaining the reception sequence of 5 bit quantity further, but be not limited to this.Both the results of comparison obtained can have only been used at the time point obtaining minimum inconsistent candidate number E0, or, it is also possible to the comparison number of times after starting according to comparison determines the comparison number of times after setting minimum inconsistent candidate number E0.Additionally, the results of comparison before setting about minimum inconsistent candidate number E0 may not be is all used or uses one periodic quantity of nearest subframe after comparison starts, but suitably determine with other scopes.

Additionally, in above-mentioned variation 2, perform intermittent reception relative to the value that the inconsistent number involved by other results of comparison is fully little for condition with several E2 less consistent and process, but be not limited to this.When there is multiple reception sequence becoming insufficient big inconsistent number relative to occurrence rate P0 occurrence rate, comprise part or all of the plurality of sequence, and as all, it is also possible to this reception time is set as shortening the reception time of 1 periodic quantity of subframe after the 2nd cycle.

Additionally, in the above-described embodiment, initially determine that the reception imagination time, only use time migration to obtain date-time accurately but it also may understand and compareed, confirm consistent sequence and carry out date of acquisition temporal information.

In addition, in the above-described embodiment, it is illustrated for the electric wave reception from gps satellite but it also may use the navigation system beyond GPS, for instance the electric wave from the satellite involved by the Galileo in Muscovite GLONASS or Europe carries out and the compareing of the sequence corresponding to each form.In addition it is also possible to the reception electric wave application present invention sending the quasi-sky allocation etc. from Japan with the GPS electric wave being benchmark.When receiving and use the electric wave from GLONASS satellite, it is possible to the transmission time (2 seconds) of string is set to receiving cycle, Series Code number is used as moment corresponding informance.

Additionally, in the above-described embodiment, the corresponding relation of subframe ID and TOW-Count is illustrated but it also may use other parts, for instance the corresponding relation of orbit information (ephemeris) and predicted orbit information (almanac).

Additionally, in the above-described embodiment, it is illustrated for analog electronic clock but it also may be digital electronic meter, or, it is also possible to it is their combination.

Additionally, the setting in the base condition shown in above-mentioned embodiment can use according to situation individually or at random combination.For example, it is also possible to suitably add with the condition criterion being expressed as two flowchart representation that date-time information reception processes, delete or replace.

In addition, in the above description, process the computer scale medium of program as the action that the locations such as the time zone computing involved by the process action of the module CPU61 of the present invention are relevant, be illustrated for the storage part 63 being made up of nonvolatile memory, but be not limited to this.Computer-readable medium as other, it is possible to application HDD (HardDiskDrive, hard disk drive) or the movable-type record medium such as CD-ROM or DVD disc.Additionally, as the medium of the program involved in the present invention via communication line offer, also apply carrier wave in the present invention.

Additionally, without departing from the scope of spirit of the present invention, it is possible to suitably concrete structure shown in the above-described embodiment, movement content or process etc. are modified.

Several embodiments of the invention is illustrated, but the scope of the present invention is not limited to above-mentioned embodiment, but include the invention scope described in claims and the scope being equal to it.

Claims

1. a Wave timepiece, it is characterised in that possess:

2. Wave timepiece according to claim 1, it is characterised in that

According between described reception sequence and described imagination sequence, the inconsistent number of each coding broken forth is determined described matching degree.

3. Wave timepiece according to claim 2, it is characterised in that

Described predetermined base condition is determined as: according to the 1st inconsistent number to the described reception sequence that inconsistent number is below predetermined upper limit value of each coding broken forth between described imagination sequence, relative to described imagination sequence by leading (preamble) position of described reception sequence from the position obtaining described 1st inconsistent number when predetermined compare width after skew each inconsistent number in minimum the 2nd inconsistent number, the value that 1st probability of occurrence obtains divided by the 2nd probability of occurrence is below the 1st reference value predetermined, wherein, 1st probability of occurrence is to become, relative to described imagination sequence, the probability that the sequence of described 1st inconsistent number occurs as described reception sequence；2nd probability of occurrence is to become, relative to described imagination sequence, the probability that the sequence of described 2nd inconsistent number occurs as described reception sequence.

4. Wave timepiece according to claim 3, it is characterised in that

Assume that binary value occurs with the probability of 1/2 respectively in each binary code constituting described reception sequence, obtains described 1st probability of occurrence and described 2nd probability of occurrence.

5. Wave timepiece according to claim 1, it is characterised in that

This Wave timepiece possesses the timing unit that date-time is counted,

Described process portion generates the described imagination sequence of coding in the moment corresponding informance corresponding to the current moment being updated according to each transmission cycle of described format determination, start to comprise predetermined quantity from bit side, lowermost position according to the date-time that described timing unit counts.

6. Wave timepiece according to claim 1, it is characterised in that

Described process portion includes generating described imagination sequence interiorly in the fixing sequence sent according to each transmission cycle of described format determination.

7. the Wave timepiece according to any one in claim 1 to 6, it is characterised in that

This Wave timepiece possesses: storage part, the reception history of the satellite waves that its storage is nearest, stores the sequence obtained by receiving nearest satellite waves as history sequence,

Described process portion will be partially contained in described imagination sequence as follows: according to the information category involved by described history sequence, it determines in this history sequence receiving the part not changed in the elapsed time that described nearest satellite waves rises.

8. Wave timepiece according to claim 7, it is characterised in that

Described satellite waves is sent from gps satellite,

Described history sequence comprises telemetry message.

9. the Wave timepiece according to any one in claim 1 to 8, it is characterised in that

Described imagination sequence comprises the multiple corresponding sequence part according to predetermined corresponding relation change,

When this correspondence sequence part according to described predetermined corresponding relation and simultaneously inconsistent with described reception sequence, described process portion is judged to be unsatisfactory for described predetermined base condition.

10. a date-time information acquisition method, its for possess receive satellite waves electric wave reception portion Wave timepiece in, it is characterised in that this date-time information acquisition method comprises the steps:

Coding discrimination step, distinguishes each coding with being encoded of form corresponding to the described satellite waves received successively；

Imagination sequence generation step, generates the imaginary sequence of the reception sequence that the part in the arrangement being assumed to be the coding distinguished described in carrying out in advance is constituted；

Matching detection step, compares each each coding encoded with described reception sequence of described imagination sequence, and the matching degree of detection and described imaginary sequence meets the described reception sequence of predetermined base condition；And

Date-time acquisition step, according to the match time receiving the described coding forming the described reception sequence meeting described predetermined base condition, date of acquisition time.