CN105739295A

CN105739295A - Wavecepter and date and time information acquisition method

Info

Publication number: CN105739295A
Application number: CN201510984744.6A
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: JP6679844B2; CN105739295B; JP2016121983A

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 identifying received code strings of a preset format corresponding to the received satellite radio waves; and a processing unit for generating a hypothetical code string pre-imagined as one part of to-be-identified received code strings and sequentially comparing the hypothetical code string with the received code strings to detect a hypothetical code string out of the received code strings. On the condition that the hypothetical code string is detected, the current data and the current time are obtained based on the hypothetical code string. The hypothetical code string contains codes that vary along with the transmission period. The transmission period is corresponding to the information of the current time transmitted in a predetermined format.

Description

Wave timepiece and date-time information acquisition method

Technical field

The present invention relates to a kind of reception and come Wave timepiece and the date-time information acquisition method of date of acquisition temporal information from the electric wave of location satellite.

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, problem that weight increases.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, it is not necessarily required to the data division that acquirement is unrelated with date-time information exactly, in asked the method for reseptance of conformability of these unwanted data divisions by odd and even data, there is the problem that the acquirement efficiency of date-time information declines.

Summary of the invention

It is an object of the invention to provide a kind of can more effectively obtain accurately the Wave timepiece of date-time information, date-time information acquisition method and record medium.

To achieve these goals, the present invention relates to a kind of Wave timepiece, it is characterised in that possess:

Electric wave reception portion, it receives satellite waves, and the reception sequence of the predetermined format corresponding to this satellite waves received is distinguished；And

Process portion, its generate be assumed to be in advance to carry out described in the imaginary sequence of the part of reception sequence that distinguishes, and compare the imaginary sequence of described generation and described reception sequence successively, in described reception sequence, thus detect described imagination sequence, when detecting described imagination sequence in described reception sequence, detection time according to this imagination sequence obtains current time of day

Described imagination sequence includes the coding can being changed according to the transmission cycle, and this transmission cycle is the cycle sending the moment corresponding informance comprising the information involved by current time with described predetermined format respectively.

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 form to the navigation message that gps satellite sends illustrates.

Fig. 3 indicates that the flow chart of the control process that date-time acquirement processes.

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

Fig. 5 indicates that the figure of data receipt time necessary in the electronic watch of the 1st embodiment and the comparative result of the conventional data receipt time based on 3 words receptions.

Fig. 6 is to the figure being set for illustrating receiving the time started.

Fig. 7 indicates that the flow chart of the control process of the date-time information reception process performed in the electronic watch of the 2nd embodiment.

Detailed description of the invention

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

[the 1st embodiment]

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

This electronic watch 1 is at least to be able to receive that the Wave timepiece that the electric wave of the location satellite (hereinafter referred to as gps satellite) involved by GPS (GlobalPositioningSystem, global positioning system) from the U.S. carrys out 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 counting 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, comparing part 612, date-time obtaining section 613, Error subtraction scheme portion 614, control portion 615, range of error calculating part 616), memorizer 62, storage part 63 (historical store 632, arrangement storage part 633), RF portion 64, baseband conversion portion 65 and catches tracking portion 66 etc..Module CPU61 includes imagination sequence generating unit 611, comparing part 612, date-time obtaining section 613, Error subtraction scheme portion 614, control portion 615 and range of error calculating part 616.These imagination sequence generating unit 611, comparing part 612, date-time obtaining section 613, Error subtraction scheme portion 614, control portion 615, range of error calculating parts 616 both can be single CPU, can also each be respectively provided with CPU to carry out each action, it is also possible to carry out each action by host CPU 41.The data being stored in storage part 63 include program 631, historical store 632 and arrangement storage part 633.These programs 631, historical store 632 and arrangement storage part 633 both can be single storage parts, can also each be respectively provided with storage part, the packet being stored in ROM42 can also be made containing program 631, make the packet being stored in RAM43 containing historical store 632 and arrangement storage part 633.

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 being decoded date of acquisition temporal information to the electric wave received, additionally it is possible to be not decoded and the reception sequence after demodulation is compared comparison to carry out consistent detection with 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.It is generated as and the comparative control of received sequence and the sequence data that use additionally, temporary 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, then 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.

Have for carrying out location to determine the program 631 of this local time information additionally, store in storage part 63, module CPU61 read and perform.

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, with host CPU 41 deenergization dividually such as 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 (when being assumed to be ground surface being 3), thus obtaining data according to these, the deviation of acquirement time is 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.

The status informations such as the information involved by date-time, the information involved by satellite position, satellite health status etc. carry out spread spectrum by C/A code (pseudo noise) and are sent from location satellite.Each location system is determined, and these send form (form of navigation message).

Fig. 2 is the figure that the form to the navigation message sent from gps satellite illustrates.

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, arrange 1023 codings (chip) with 1.023MHz and sent with the 1ms cycle.Leading (preamble) of this chip is Tong Bu with the internal clocking of gps satellite, therefore by each gps satellite being detected the deviation of its phase place, thus detecting the propagation time i.e. phase deviation (pseudo-distance, range index value) corresponding to distance from gps satellite to current location.

Each frame data are made up of 5 subframes (6 seconds).Further, each subframe is made up of 10 words (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), including the telemetry message (TLMMessage) of 14 bits, it is configured with 6 bit odd and even datas across the integrity state mark (Integritystatusflag) of 1 bit and the pre-bit of 1 bit afterwards.In word 2, and then represent the TOW-Count (also referred to as Z-count) of 17 bits in elapsed time in week, respectively illustrate caution sign and the anti-false sign of each 1 bit.Then, illustrate the subframe ID representing subframe number (cycle numbering) with 3 bits, be arranged with the odd and even data of 6 bits across 2 bits of odd and even data integration.

The later data of word 3 are different because of subframe.In the word 3 of subframe 1, at the leading WN (week numbering) including 10 bits.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.

Generally, for date of acquisition temporal information, it is necessary to be decoded according to the form of navigation message after receiving the WN of the subframe 1 and TOW-Count of each subframe, obtain date and hour.But, when known dates etc. and need not obtain current date-time be any week, only by obtaining TOW-Count value and this lock in time, it becomes possible to be combined with Given information and obtain complete date-time.As it has been described above, when the deviation (step number) of the date-time of timing circuit 46 counting is fully little, the probability of the deviation producing more than 1 day is very little, in most instances, it is possible to omit the reception of WN.In the electronic watch 1 of present embodiment, when the sequence received is understood date of acquisition temporal information, if from last time date of acquisition temporal information elapsed time not past the scheduled period, for instance when more than one month, become the setting of the reception that can omit WN.

But, in order to obtain the value of TOW-Count, it is necessary to distinguish which part in the coding permutations receiving navigation message.Additionally, when being demodulated to the received signal, if not recognizing the coding permutations of this TOW-Count exactly, then inaccurate date-time can be obtained, therefore obtain the information for assuring accuracy generally simultaneously.

In the electronic watch 1 of present embodiment, it is assumed to be, with predetermined bit length generation, the imaginary sequence received in advance by the module CPU61 of satellite waves reception processing unit 60.Then, module CPU61 discriminates whether to have received correct date-time by this imagination sequence and the sequence that is an actually-received are compareed, additionally, carry out synchronize according to the time (detection time) having carried out the detection consistent with the sequence received of this imagination sequence with current time of day accurately.That is, the date-time represented by the detection time of imagination sequence and this imagination sequence obtains date-time information accurately.

This imagination sequence such as can include not relying on the transmission cycle as leading (Preamble) or pre-bit and according to the change of date-time as regular coding or TOW-Count, subframe ID, WN, namely according to part or all of the sequence of the transmission mechanical periodicity of subframe.In addition, as caution sign or anti-false sign, it is generally " 0 ", not can be predicted without wishing to the coding (predetermined flag involved by transmission state) used when " 1 " but it also may be assumed to be " 0 " and be added in imagination sequence.

And, storage part 63 can be made to be stored in coding permutations received when receiving recent or satellite waves repeatedly and its date received time (reception history), by in the coding permutations of this storage, coding site according to navigation message is (namely, information category) perfect forecast cannot go out the change after receiving last time, but usually it is judged as being not changed within this elapsed time when the elapsed time from receiving from last time is short, the such as telemetry message of word 1, utilize as imagination sequence, or can also combine the part of telemetry message or complete and above-mentioned fixing sequence or according to send the sequence of mechanical periodicity and as imagination sequence.The judgement that whether can be used in imagination sequence is not merely defined in situation about only carrying out in the elapsed time from the reception of last time, it is also possible to add in the reception being used in repeatedly all without conditions such as the codings changed.

Similarly, achieve the data involved by track of the location satellites such as almanac data, and when not past time to next renewal, it is possible to make the data involved by this track also be included in imagination sequence.

In addition, in particular it is preferred that use the date-time of timing circuit 46 counting to generate imagination sequence to comprise a part at least the next bit (LBS) side reflecting the moment and the TOW-Count that changes that send with each transmission cycle or subframe ID (moment corresponding informance) in imagination sequence, thereby, it is possible to reduce the probability distinguished caused by the difference sending one periodic quantity of cycle (a sub-frame amount) further by mistake.Additionally, so when estimation error little to can not the degree of reception of imagination different subframes, it is possible to only carried out the adjustment of the time deviation of the date-time data of timing circuit 46 by the detection time.Such as, according to the distribution (step number) of the error of the date-time of timing circuit 46 counting with carry out date-time revised elapsed time of last time and obtain the estimation of this error.As it has been described above, when the step number of timing circuit 46 is 0.5 second/day, the error amount after estimating 30 days after the date-time correction of last time (recently) is 15 seconds.

Odd even according to the 29th bit in word before or the 30th bit encodes the Bit data with each necessity in the 1st bit～the 24th bit in same word and calculates the odd and even data of the 25th～30 bit being arranged in each word.Therefore, it is difficult to the odd even coding of the 29th bit in word and the 30th bit before imagination, in the electronic watch 1 of present embodiment, these odd and even datas are not included in imagination sequence.

The coding permutations compareed, distinguished is not required to be whole continuous print, can also be assigned in multiple different sequence part, whole reception length is receive the common short time, such as preferably receive, than 3 words, the scope that (90 bit) is short, further, more have choosing be than comprise Preamble, TOW-Count containing current time information and the word 1 of odd and even data (error correcting code) corresponding with TOW-Count, word 2 add up to length (data block length) namely 60 of 2 word amounts than ultrashort scope.

At this, when comparison imagination sequence and reception sequence, the sequence corresponding with the information that reality sends from gps satellite, the coding (coding beyond odd and even data) at each word the 1st～24 bit is reversed according to the coding of the odd and even data (reverse code) of the final bit (the 30th bit) of word before.That is, when reverse code is " 0 ", the coding of the 1st～24 bit of next word is directly transmitted according to transmission information, on the other hand, when this reverse code is " 1 ", in the coding of the 1st～24 bit of next word, the sequence corresponding with transmission information is all reversed.Therefore, when compareing, carry out following any process.(1) generate multiple by according to the sequence based on the imaginary transmission information of this reverse code, and compare respectively；(2) whether completely the same or completely inconsistent with word unit detection imagination sequence and reception sequence, when completely inconsistent, the reverse code in the word before distinguishing this word further, confirm whether this reverse code is " 1 "；(3) with word unit imagination sequence and receive sequence completely the same or completely inconsistent when, imagination is from receiving detection all imagination sequence in sequence.

(1) when, the process load increase that comparison is involved；(2), when, the process after imagination sequence detection increases；(3), when, the probability by mistake distinguished increases, and therefore the performance etc. according to the hobby of user or electronic watch 1 suitably determines any one.

When differentiating detection (reception) of these imagination sequence, if the sequence identical with imagination sequence occurs in the position beyond original imaginary position (imagination external position), then sometimes obtain the date-time of mistake.About the probability occurring the sequence identical with imagination sequence at this imagination external position, imagination sequence is more short more high, and the imagination sequence more long reception time becomes more long on the other hand.Therefore, in the electronic watch 1 of present embodiment, the probability of occurrence of " 0 ", " 1 " in each binary code is simply turned to 1/2 equably, determines the reference value of this frequency of occurrences or occurrence rate and set the length of imagination sequence in the way of fully little compared with the imagination frequency of occurrences of sequence or occurrence rate receive times or frequency with the imagination of the date-time data in the life of product of electronic watch 1.

That is, the probability of occurrence of the sequence of a certain N-bit becomes (1/2) N, as long as the sequence length that this probability of occurrence is fully little.Such as, will appear from probability and be set to less than 10-8, therefore N >=27, will appear from probability and be set to less than 10-6, therefore N >=20.If the life of product of imagination electronic watch 1 is carry out 6 reception actions in 20 years and one day, then imagination receives number of times is 43830 times, therefore when N=20, the probability producing once by mistake to distinguish during life of product is about 4.2%, when N=27, the probability producing by mistake to distinguish is about 0.033%.

The reference value of this probability of occurrence both can be preset, (such as, various different reference value can also be set accordingly from the performance such as " strictly ", " common ", " pine ") according to user directly or indirectly to the setting input operation of operating portion 49 to be set.

Fig. 3 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. 4 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).

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 the setting involved by this change to generate appropriate imaginary sequence from storage part 63.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 deviation of signal phase place that obtains of electric wave applies each gps satellite on one side, thus detecting, catching the signal from gps satellite.

If catching the signal from gps satellite, then module CPU61 follows the tracks of this gps satellite and obtains the sequence (reception sequence) (step S205) receiving data.Module CPU61 compares the imaginary sequence (step S206) of the predetermined bit length corresponding with the arrangement width of imagination sequence in the reception data of this acquirement and this generation.Module CPU61 discriminates whether to have detected reception data and the imagination on all four part of sequence (step S207).When be determined as do not detect on all four part (in step S207 for "No"), module CPU61 differentiate with imagination sequence compare start after whether have passed through 6 seconds more than (the transmission cycle of 1 sub-frame amount), namely differentiate the leading position whether deviation more than 6 seconds (step S208) of the sequence of the predetermined bit length compareed in reception sequence.When being determined as not past 6 seconds (for "No" in step S208), the process of module CPU61 is shifted to step S210.

When be determined as have passed through 6 seconds (in step S208 for "Yes"), module CPU61 generates (namely be based on the moment that send week after date of subframe) the imaginary sequence corresponding with next subframe and updates (step S209).Afterwards, the process of module CPU61 is shifted to step S210.

If shifting to the process of step S210, then whether module CPU61 differentiation have passed through time-out time (step S210) after starting from reception.Time-out time is set in the subframe amount etc. of predetermined quantity, 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 S210), the process of module CPU61 returns to step S205, module CPU61 continuation obtains and receives data, and according to the new reception data obtained, in the process of step S206, make to compare the coverage bias of the sequence of the predetermined bit length compareed with imagination sequence.When be determined as have passed through time-out time (in step S210 for "Yes"), the process of module CPU61 is shifted to step S212.

When be determined as during the differentiation of step S207 processes detected reception data and imagination sequence on all four part (for "Yes" in step S207), module CPU61 obtains the date-time that the imaginary sequence consistent with this is corresponding, synchronously host CPU 41 is exported these date-time data (step S211) with the time started of this date-time (that is, the leading time of next subframe).

If shifting to the process of step S212, then module CPU61 makes satellite waves reception processing unit 60 stop (step S212).Then, the reception of module CPU61 Close Date temporal information processes.

Fig. 5 indicates that the figure of the comparative result of the data receipt time encoding data receiver (tracking) time necessary on all four situation and existing 3 words reception (odd even confirmation) detecting 28 bits in the electronic watch 1 of present embodiment.Transverse axis represents the received-signal strength (performance number [dBm]) of the input signal from gps satellite, the time (sec) that the longitudinal axis is required till representing the data acquirement of necessity.At this, existing 3 words receive involved data receipt time and indicate that such value: if by the even-odd check detection mistake of 3 word amounts of word 1～word 3, then imagination also continues to the data receiver of 6 seconds till receiving the word 1～word 3 in next subframe, catch the measured value of time till this tracking from the electric wave of gps satellite captured after the electric wave of gps satellite terminates.In addition, the value that data receipt time based on the method for reseptance of present embodiment is by following estimation and obtains: when with the coding with this actual measurement, imagination distinguishes that identical error rate there occurs mistake at random coding site, in imagination sequence, produce symbol distinguish when mistake detects completely the same, before the sequence of the same position in the imagination next subframe of transmission, also continue to the data receipt time when data receiver of 6 seconds.

As shown in dotted line (b), in existing method of reseptance, if the received-signal strength of input signal is at below 140dBm, then drop to the period of 144dBm further at received-signal strength, the time obvious elongated several times degree required for data receiver.On the other hand, data receipt time in the electronic watch 1 of the present embodiment shown in solid line (a), even if received-signal strength drops to 144dBm degree, the reception time does not increase (within tens of % degree) very much, promptly obtains date-time information accurately.

As it has been described above, the electronic watch 1 of the 1st embodiment possesses the RF portion 64 of satellite waves reception processing unit 60, baseband conversion portion 65 and seizure tracking portion 66, the module CPU61 that receive the satellite waves from location satellite the receptions sequence to the predetermined format corresponding with the satellite waves that this receives and distinguish；Module CPU61 as imagination sequence generating unit 611 generates at least one of imagination sequence being assumed to be in identified reception sequence in advance；Module CPU61 as comparing part 612 passes through compare the imaginary sequence generated successively and receive sequence, from receiving the imaginary sequence of detection in sequence；Module CPU61 as date-time obtaining section 613 when detection imagination sequence, obtains current date-time according to the detection time of this imagination sequence in reception sequence.Now, imagination sequence comprises such coding: the coding changed according to sending the period of sub-frame of the moment corresponding informance such as TOW-Count or subframe ID respectively, wherein, TOW-Count or subframe ID comprises the information involved by current time because of the form from the navigation message of the location satellite transmission receiving object.

Thus, compared with the situation using parity bits, it is not required that integrate unwanted Bit data, as long as the integration obtaining the Bit data of comparison other then can obtain date-time information accurately, therefore, it is possible to more effectively obtain date-time information accurately.

Additionally, generate imagination sequence before the reception of satellite waves or in receiving and compare with receiving sequence, it is decoded thus without to the sequence received, therefore receive in sequence after detection imagination sequence can promptly date of acquisition time.

Additionally, especially can reduce, when receiving state difference, the probability needing again to receive, therefore, it is possible to reduce the increment rate receiving the time receiving under environment of difference, further, it is possible to suppress to receive the increase of required power consumption.

In addition, possesses the timing circuit 46 to date-time counting, even if as date-time obtaining section 613, the time deviation of the date-time that module CPU61 only obtains timing circuit 46 counting by the detection time according to the imaginary sequence received in sequence adjusts date-time, therefore, it is possible to process when simplifying the deviation not having in imaginary subframe unit, it is possible to be easier to and date of acquisition time effectively.

In addition, possesses the timing circuit 46 to date-time counting, module CPU61 as imagination sequence generating unit 611 generates including at least imaginary sequence in the TOW-Count or subframe ID etc. that represent moment corresponding informance, predetermined quantity the next bits of encoded according to the date-time that timing circuit 46 counts, the detection time as the module CPU61 of date-time obtaining section 613 date-time and the imaginary sequence received in sequence combining timing circuit 46 counting obtains current date-time, therefore, it is possible to reduce the probability because the deviation etc. of subframe unit distinguishes by mistake.

Additionally, bit number is many compared with the bit number of fixing sequence, therefore use these can reduce the probability by mistake distinguished, it is possible to increase precision.

In addition, as imagination sequence generating unit 611 module CPU61 when from receive in sequence do not detect imagination sequence and have passed through time (6 seconds) of 1 sub-frame amount, imagination sequence is updated according to the moment corresponding informance after this 1 subframe, even if therefore when detecting failed because of the low situation of receiving intensity or the many situation of noise etc., also being able to again easily attempt the detection of imagination sequence in next subframe.

Additionally, namely the cycle numbering comprising, in the moment corresponding informance that imagination sequence comprises, the numbering representing the above-mentioned transmission cycle is equivalent to the value of subframe ID.That is, can not only imagination TOW-Count, additionally it is possible to similarly in subframe ID imagination according to the time through and the value that changes, therefore, it is possible to according to being used in the bit number of imagination sequence to utilize with TOW-Count effect same.Additionally, use imagination sequence together with TOW-Count, it is possible to the generation more effectively suppressing by mistake to distinguish.Additionally, be closely arranged in word 2 with TOW-Count, therefore it be able to efficiently generate compared with the increase receiving bit number and think sequence long holidays.

In addition, imagination sequence length is determined as imagination sequence receiving the probability coming across the position beyond original imaginary position in sequence less than the reference value predetermined, therefore, it is possible to short imagination sequence is occurred in the probability producing to distinguish beyond the original imaginary positions received in sequence be reduced to the level of necessity by mistake.

In addition, especially the probability of occurrence of imaginary external position of imagination sequence is obtained and occur with the probability of 1/2 respectively into binary value in constituting the binary code receiving sequence, therefore, it is possible to easily and be difficult to the big calculating probability of deviation from actual probabilities and determine the length of imagination sequence.

In addition, the imagination of the satellite waves according to electric wave reception portion receives number of times and determines reference value, therefore in the Wave timepiece frequently utilized for a long time, set strict benchmark, be utilized in the Wave timepiece of utilization in few frequency and/or short time and set pine benchmark, under any circumstance the frequency by mistake distinguished can both be suppressed in the scope that will not produce big problem, and the acquirement of date-time can be carried out with best efficiency.

Additionally, possess the operating portion 49 accepting user operation, determine reference value according to inputting to the setting of operating portion, the reception time of occurrence frequency or the frequency, satellite waves by mistake distinguished therefore according to the expectation of user, can be determined according to behaviour in service etc. rightly.

In addition, the length receiving sequence being determined as the data block length of odd and even data more leading than comprising, that TOW-Count and TOW-Count is corresponding short, the most short receptor time therefore can make electric wave reception state no problem, not producing reception again etc. receives short than common 2 words.

In addition, module CPU61 as imagination sequence generating unit 611 generates the imaginary sequence corresponding from multiple different sequence parts received in sequence, even if therefore accompanying and be difficult to imaginary coding in the way receiving sequence, it is also possible to skip centre and generate the imaginary sequence of proper bit length.

In addition, module CPU61 as imagination sequence generating unit 611 comprises the transmission cycle corresponding with the satellite waves received, what be namely included in gps satellite to comprise in each subframe generates imagination sequence leadingly, therefore by the combination as the leading of fixing sequence and the sequence at each transmission mechanical periodicity, it is possible to be effectively taking place high-precision time detecting.

In addition, the transmission sequence of the navigation message corresponding with sending the content from the transmission information of gps satellite of satellite waves received includes deciding whether respectively making in units of 1～24 bit of each word respectively numbering, in unit program block, the reverse code reversely sent afterwards at this unit program block, generating, as the module CPU61 of imagination sequence generating unit 611, the unit program block being included in imagination sequence respectively makes each coding reversely and the imaginary sequence of the imaginary sequence of sequence that obtains and the sequence that do not make each coding reverse respectively, module CPU61 as comparing part 612 compares each imagination sequence generated and receives sequence.

Therefore, it is independent of the coding with or without effective unit brick and reversely can easily detect imagination sequence according to receiving sequence.

In addition, as the module CPU61 of imagination sequence generating unit 611, at least one the mark ground comprised in the predetermined flag involved by transmission state such as caution sign, anti-false sign or integrity state mark (Integritystatusflag) generates imagination sequence.These codings are not necessarily required to be predictable, no problem mark can be assumed to be and generate imagination sequence, it is possible to prevent according to the unexpected bad reception data date of acquisition time, and generally, precision can improved by increasing the bit number of imagination sequence.Especially, caution sign or anti-false sign are between TOW-Count and subframe ID, therefore, it is possible to do not increase reception increase temporally to compare bit number.Thereby, it is possible to more effectively realize raising the date of acquisition temporal information of Receiver Precision.

In addition, possesses storage part 63, this storage part 63 is used as the historical store 632 of the reception history of the nearest satellite waves of storage and stores the arrangement storage part 633 of the coding permutations obtained by the reception of nearest satellite waves, as the module CPU61 of imagination sequence generating unit 611 using according to being stored in as the information category involved by the coding permutations in the storage part 63 of arrangement storage part 633, it is judged that in this coding permutations, being included at least partially imagination sequence from the part being not changed in the elapsed time after receiving nearest satellite waves.Namely, storage might not measurable but the coding permutations and telemetry message etc. that generally have almost no change, it is used in the situation that the elapsed time started from last time is short etc. in imagination sequence, thus improves the probability ground come into question in the detection of the imaginary sequence received in sequence hardly and can improve accuracy of detection further.

Additionally, by using above-mentioned date-time information acquisition method, even if using multiple CPU or radio wave receiver can not also be able to date of acquisition temporal information effectively under the situation etc. of date of acquisition temporal information.Therefore, it is possible to shorten the reception time by corresponding equilibriums such as the hobbies with the performance or user of this CPU or radio wave receiver, or raising obtains precision.

In addition, the program of the control that involved date-time information reception processes is obtained by making the module CPU61 of computer (satellite waves reception processing unit 60) perform above-mentioned date-time, by being able to receive that the various terminals of the electric wave from location satellite can obtain various date-time information effectively according to the purposes or performance etc. of this terminal, wherein, computer possesses reception satellite waves and the reception sequence of the predetermined format corresponding with the satellite waves that this receives is distinguished.

[the 2nd embodiment]

Then, the electronic watch of the 2nd embodiment of the present invention is illustrated.

The structure of the electronic watch 1 of the 2nd embodiment is the structure identical with the electronic watch 1 of the 1st embodiment, uses same-sign, therefore omits the description.

Then, the acquirement action of the date-time information in the electronic watch 1 of the 2nd embodiment is illustrated.

In the electronic watch 1 of present embodiment, when receiving sequence and imagination sequence in comparison, carry out the adjustment of condition criterion and comparison time difference can not be sent the cycle (subframe) and to compare.Electronic watch 1 for other actions Yu the 1st embodiment is identical, omits detailed description for identical movement content.

Timing error as it has been described above, in timing circuit 46, within producing ± 0.5 second every day according to the operation condition such as temperature.Therefore, the maximum of the error of the date-time through timing circuit 46 over time of the nearest time after the date-time that correction timing circuit 46 counts becomes big, and the probability that imagination sequence becomes different transmission cycle (subframe) with reception sequence uprises.In the electronic watch 1 of present embodiment, it is set so that during the comparison starting to receive sequence and imagination sequence must comprise the transmission of the sequence consistent with imaginary sequence in latter 6 seconds receiving the time started.In addition, in advance the time of the date-time correction of last time is stored in storage part 63, when the action of time Start Date, module CPU61 differentiate from date-time revised elapsed time of last time whether more than 6 days (namely, the maximum of the error of estimation is more than ± 3 seconds, add up to more than 6 seconds, be whether subframe length (sending the cycle) half (according to the fiducial time that the cycle of transmission determines) more than (adding up to more than subframe lengths), when being more than fiducial time, switch to the adquisitiones of the date-time carrying out other, such as the sequence involved by navigation message is decoded the date of acquisition time etc. after receiving by existing 3 words.

Fig. 6 is to the figure being set for illustrating receiving the time started.

At this, illustrate for the error situation below ± 2 seconds estimating date-time that timing circuit 46 counts.

When with the date-time (UTC) of timing circuit 46 the pre-time divide when within 00 second, having started to receive, as shown in Fig. 6 (a), this reception time started after 58 seconds that the moment accurately is its 1 minute front time-division with certain time in the period (horizontal beam of epimere) before 2 seconds in the identical time-division of timing circuit 46.In the date-time (GPS date-time) sent from gps satellite, because of the enforcement of leap second and there is deviation (being here illustrated as+17 seconds) between UTC date-time, therefore receive after 15 seconds in the time-division that the time started becomes identical with the time-division of timing circuit 46 in GPS date-time before 19 seconds.And, when needing 2 seconds when catching the electric wave from gps satellite, capturing motion can distinguish after terminating, obtain sequence, and the leading time (describing as the comparison time started) of the receptions sequence the earliest that namely can carry out compareing with imagination sequence is that 21 seconds in the past (horizontal beam in stage casing) after 17 seconds of identical minute.

About the data of each subframe sent from gps satellite, the per minute from GPS date-time starts to proceed by transmission every 6 seconds for 0 second.Therefore, imagination sequence is set to from the leading predetermined bit of each subframe (such as, total 28 bit being made up of leading, TOW-Count and subframe ID) when, if receiving start time (UTC) accurately between 58 seconds to 59 seconds, then in GPS date-time, the reception sequence (the left side horizontal beam of hypomere) comprising leading subframe started at 18 seconds is compared with imagination sequence.On the other hand, when receive accurately start time (UTC) between 59 seconds to 2 seconds, in GPS date-time by 24 seconds start the reception sequence (the right side horizontal beam of hypomere) containing leading subframe with imagination sequence compare.Its result, under any circumstance, TOW-Count or subframe ID is in imagination sequence and receives the value becoming different between sequence, thus imagination sequence and reception sequence are not quite identical.

In the electronic watch 1 of present embodiment, set and receive the time started with the comparison time started so that the sequence in the subframe identical with imagination sequence must be distinguished, obtain and compare by the error ground being independent of timing circuit 46.Such as, as shown in Fig. 6 (b), UTC date-time in timing circuit 46 is set to 2 seconds (down arrow of epimere) by receiving the time started, and thus the comparison time started is after GPS date-time becomes 19 seconds before 23 seconds (horizontal beam in stage casing).Its result, the corresponding part compared with imagination sequence in receiving sequence must become the sequence (the right side horizontal beam of hypomere) comprising leading subframe started at 24 seconds.Generate accordingly, as imagination sequence and be assumed to be the sequence that the subframe started at 24 seconds is sent, thus do not rely on the error of timing circuit 46 and imagination sequence and the comparative control receiving sequence can be carried out definitely.

At this, it is possible to the central instant (central date time) meeting the comparison time started of such condition is set as between 2 seconds of 20 seconds to 22 seconds (the horizontal arrow in stage casing of Fig. 6 (b)).Namely, in electronic watch 1, when the error estimation time is within ± 3 seconds (all amplitudes are 6 seconds), the leading time of predetermined subframe is proceeded by comparison by the random time within the period (can compare start period) of 3 ± (3 error estimation time) seconds, the reception sequence involved by identical subframe and imagination sequence is compared comparison with it is possible to be independent of the size of this error estimation time.Receptions sequence involved by the time of 3-(the 3-error estimation time) second corresponding with the leading time of subframe subframe before the application condition of the date-time according to timing circuit 46 compares the latest and after the time of imagination sequence, the time of 3+ (the 3+ error estimation time) second corresponding with the leading time of subframe is the time of the reception sequence involved by subframe after the application condition of the date-time according to timing circuit 46 compares the earliest and imaginary sequence.Comparison the time started both can compare start period at random determine every time, the precalculated position predetermined can also be fixed as, such as can compare leading (in this case 20 seconds) or the central instant (21 seconds, the stage casing down arrow of Fig. 6 (b)) that start period.

Carry out inverse operation with considering pull-in time determine to receive time Start Date for this comparison time started.At this, 2 seconds of pull-in time are being shifted to an earlier date than the comparison time started, namely (such as, as receiving leading 1 second starting period or as central instant 2 seconds) starts to receive the UTC date-time in timing circuit 46 random time before 3 seconds (reception starts period) or scheduled time after 1 second.Within the time shorter than the pull-in time considered, complete the electric wave from gps satellite when catching, the tracking of this electric wave and sequence distinguish beginning after, comparison can set stand-by time before starting.The time started is received according to receiving leading setting theing start period, even if thus the pull-in time of reality is longer than the pull-in time considered, improve according to the predetermined probability starting comparison originally, on the other hand, even if receive the time when receiving in good condition elongated, consuming quantity of power increases.It is thus possible, for instance initial being set to receiving the time started is received the central instant starting period, it is made to change backward forwards, backwards according to receiving history etc..In addition, initial being set to receiving the time started is received the central instant starting period, even if the time thus caught slightly before after also not from can compare start period deviation, therefore in this case, even if again do not discriminate whether can compare start period in and directly start compare, generally also will not come into question.

Fig. 7 indicates that the flow chart of the control process of the module CPU61 of the date-time information reception process performed in the electronic watch 1 of the 2nd embodiment.

In the electronic watch 1 of present embodiment, process about date-time information reception, except the date-time information reception performed in the electronic watch 1 of the 1st embodiment is processed the process adding step S221～S224, identical with the date-time information reception process performed in the electronic watch 1 of the 1st embodiment, give identical symbol to identical process content and omit the description.

Start if date-time information reception processes, then in the process of step S201, module CPU61 obtains the date-time of timing circuit 46 counting, and obtain the reception time of last time from storage part 63, calculate the elapsed time imaginary maximum error (step S201) after the date-time according to this timing circuit 46 of correction.

Module CPU61 differentiates that whether maximum error is less than ± 3 seconds (step S221).When being determined as ± 3 seconds (for "No" in step S221), the process of module CPU61 is shifted to step S224, by receiving the existing method of 3 words from gps satellite, sequence is decoded date of acquisition temporal information (step S224).Afterwards, the process of module CPU61 is shifted to step S211.

When being determined as maximum error less than ± 3 seconds (for "Yes" in step S221), if having started reception after current time of day, then module CPU61 determines to be independent of error and necessarily with the subframe determined in the way of initial comparison, can generate the imaginary sequence (step S202) in this subframe.

Module CPU61 considers pull-in time set in advance, be determined to start to obtain the symbol string of the above-mentioned subframe determined from stem reception with being independent of error starts period, it determines current time of day master worker is even to start in period (step S222) in this reception.When being determined as in not during reception starts (for "No" in step S222), module CPU61 repeats the differentiation of step S222 and processes.

When being determined as in during reception starts (for "Yes" in step S222), the process of module CPU61 is shifted to step S203.

After the acquirement having started reception data (reception sequence) after shifting to the process of step S205, module CPU61 discriminates whether to start in period (step S223) can compare.When be determined as not can compare start in period (in step S223 for "No"), module CPU61 repeats the process of step S223.When be determined as can compare start in period (in step S223 for "Yes"), the process of module CPU61 is shifted to step S206.

Additionally, in step S208, module CPU61 differentiates and starts and whether have passed through 6 seconds after imagination the compareing of sequence more than (the transmission cycle of 1 sub-frame amount), namely differentiates that whether the leading position of the sequence receiving the predetermined bit length compareed in sequence is from compareing time started position deviation more than 6 seconds.

As mentioned above, in the electronic watch 1 of the 2nd embodiment, module CPU61 as comparing part 612 and starts in the period less than one cycle of subframe from the detection time before the detection time of the imaginary sequence of the date-time prediction counted according to timing circuit 46, starts the comparative control receiving sequence and imagination sequence.

Compare therefore, it is possible to compare with the sequence part corresponding to this imagination sequence in the subframe being different from imagination sequence such that it is able to suppress to detect the generation of the situation consistent with imagination sequence.

Additionally, have modified the range of error of the elapsed time estimation timing circuit 46 that nearest time of date-time of timing circuit 46 counting starts according to receiving above-mentioned satellite waves as the module CPU61 of range of error calculating part 616.Module CPU61 as comparing part 612 considers this range of error, estimation range in the detection time of the imaginary sequence according to prediction can start to receive can the compareing of comparative control of sequence and imagination sequence and start in period, proceeds by the comparative control receiving sequence and imagination sequence.

Thus, as long as in the range of error from timing circuit in the electric wave reception of gps satellite 46 within ± 3 seconds, then the reception sequence part corresponding to this imagination sequence in subframe identical with imagination sequence must be compared with this imagination sequence and compare, therefore by mistake extent ground it is independent of, it is possible to positively avoid the receptions sequence of comparative control difference subframe and imaginary sequence can not detect the situation of completely the same part.

Additionally, the RF portion 64 of satellite waves reception processing unit 60, baseband conversion portion 65 and seizure tracking portion 66 determine according to compareing the time starting the reception that period starts satellite waves.So, with can compare start period start electric wave reception rightly for benchmark, it is possible to prevent the unwanted electric wave reception time elongated, control power consumption rightly.

Additionally, the RF portion 64 of satellite waves reception processing unit 60, baseband conversion portion 65 and catch tracking portion 66 in the reception proceeding by satellite waves than the time advance of the comparative control starting to receive sequence and imagination sequence time set in advance.Namely, detection time of imaginary sequence according to prediction determines this imagination sequence and receives the comparison time started of sequence and the reception time started of satellite waves, it is possible to easily and rightly reduction electric power consumption and carry out the acquirement of efficient date-time information.Especially, because of satellite waves receive environment wait without big change every time and be assumed to be satellite waves catch the required time substantially certain when, it is possible to carry out the acquirement of more notable efficient date-time information.

In addition, differentiate that as the module CPU61 in Error subtraction scheme portion 614 error of timing circuit 46 of elapsed time estimation that the time that have modified the date-time of timing circuit 46 according to receiving satellite waves last time starts is whether more than the fiducial time determined according to subframe lengths, as date-time obtaining section 613 module CPU61 when be determined as error not more than fiducial time, carry out the acquirement of the date-time of the imaginary sequence of the coding of the next bit based on the predetermined quantity comprised in the moment corresponding informance such as TOW-Count or subframe ID.

Namely, big in the error of timing circuit 46, when there is the probability that the deviation in subframe unit occurs, require time for before sequence detects imagination sequence from receiving or do not have the probability of detection to uprise, therefore from receiving sequence detection imagination sequence after such situation that really admits a fault, it is possible to carry out more rightly the acquirement action of efficient 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, whole process actions has been carried out as the module CPU61 in control portion 615 but it also may perform one part or whole by host CPU 41.Additionally, module CPU61 and host CPU 41 can be used together in single CPU, storage part 63 and RAM43 can also be used together in the storage of the reception history etc. of last time (recently).

In addition, module CPU61 both can while having made in the coding deviation one by one acquired by every 1 bit acquirement, while carrying out imagination sequence and receiving the comparison of sequence, it is also possible to deviation phase being uniformly carried out and the compareing of imaginary sequence after obtaining the reception data of the predetermined number of bits longer than imaginary sequence.In the former case, if terminating comparison at the time point picking out imagination sequence in reception sequence, then, when wrong distinguishing, directly terminate, even in than the position that receives after original precalculated position, the sequence identical with imagination sequence occurs, without coming into question.In the latter case, though the front and back of original imaginary positions, when the imaginary external position received in data occurs in that the sequence identical with imagination sequence, it is necessary to carry out the process for distinguishing tram, but can more effectively avoid distinguishing by mistake.

In addition, in the above-described embodiment, the acquirement action of date-time information involved in the present invention has been carried out when revising the date-time of timing circuit 46, but both can be intended to obtain simply between the pre-time point (such as, when user carries out input operation) the situation of date-time, can also be that user carries out input operation or obtains from other external device (ED)s when needing the date-time etc. involved by imagination sequence.

In addition, in the above-described embodiment, estimation error according to timing circuit 46 discriminates whether to have carried out the acquirement of date-time information involved in the present invention, but estimating that itself situation of by mistake extent is inferior exactly, the little imaginary sequence based on date-time reflecting this error can also be generated, carry out compareing date of acquisition temporal information with receiving sequence.

Additionally, in the above-described embodiment, describe and receive, from gps satellite, the situation that electric wave carries out compareing but it also may with from other location satellites, for instance compare with the coding permutations involved by electric wave that receives from GLONASS satellite.In this case, it is also possible to by the transmission cycle (2 seconds) of string (string) as the transmission cycle, Series Code number is used as moment corresponding informance.

In addition, in the above-described embodiment, the probability of occurrence of " 0 ", " 1 " in each coding site is not instead set to 1/2 probability of occurrence of imaginary sequence calculating in imagination external position, but other probabilities of occurrence of section sets that the upper of fixing sequence or TOW is substantially more different from 1/2 than top grade probability of occurrence are calculated.

Additionally, the setting of the electric wave reception frequency of the life of product of the electronic watch 1 represented in the above-described embodiment or every day is arbitrary.Both can be set in advance according to product, it is also possible to can appropriately change according to user operation.Therefore, can increase and decrease rightly for the comparison bit number obtaining the precision of necessity according to these.

Additionally, in the above-described embodiment, describe by word 1, word 2 position centered by identical subframe in reception and with the compareing of imagination sequence, but it is not limited to the reception of subframe 1, it is also possible to include the WN etc. of word 3, and, it is not limited to subframe 1, it is also possible to be the data of other subframes.And, it is also possible to generate imagination sequence across adjacent sub-frame data.

In addition, in the above-described embodiment, describe the situation preferably sequence changed accordingly with the transmission cycle (subframe) being included in imagination sequence, but both can generate imagination sequence according only to the sequence of so change, it is also possible to according to the combination producing imagination sequence with fixing sequence.

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

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

Described process portion obtains the time deviation of the date-time of described timing unit counting according to described detection time.

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

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

The date-time that described process portion counts according to described timing unit generates described imagination sequence and combines the date-time of described timing unit counting and described detection time obtains current time of day, wherein, this imagination sequence comprises the coding of the next bit of the predetermined quantity of the sequence representing described moment corresponding informance.

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

When in described reception sequence, do not detect described imagination sequence and when have passed through the time in described transmission cycle more than, described imagination sequence generate unit according to this in transmission week after date described moment corresponding informance update described imagination sequence.

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

The length of described imagination sequence is determined into the probability of the position that described imagination sequence is come across beyond original imaginary position in described reception sequence less than the reference value predetermined.

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

The length of described imagination sequence is determined into less than data block length, this data block comprise not by the fixing sequence of described transmission mechanical periodicity, date-time information current time information and for the error correcting code of this time information.

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

The transmission sequence of the described predetermined format corresponding to the content of the transmission information that the location satellite of the described satellite waves that transmission to receive sends comprises reverse code, each coding that this reverse code division does not decide whether in the units chunk making to predetermine reversely is transmitted by this units chunk

Described process portion generates the imaginary sequence comprising the sequence making each coding reverse respectively by the described units chunk in described imagination sequence and to obtain and the imaginary sequence comprising the sequence not making described each coding reverse respectively, and each imagination sequence and described reception sequence to generating compares.

8. 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, and stores the coding permutations obtained by receiving nearest satellite waves,

The kind of described process portion information involved by the coding permutations being stored in described storage part, by this coding permutations, be judged as a part for the part not changed within the elapsed time from receiving described nearest satellite waves be included in described imagination sequence in.

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

Electric wave reception portion, it receives satellite waves, and the reception sequence of the predetermined format corresponding to this satellite waves received is distinguished；

Process portion, its generate be assumed to be in advance to carry out described in the imaginary sequence of the part of reception sequence that distinguishes, and compare the imaginary sequence of described generation and described reception sequence successively, in described reception sequence, thus detect described imagination sequence, when detecting described imagination sequence in described reception sequence, obtain current time of day according to the detection time of this imagination sequence；And

Storage part, the reception history of the satellite waves that its storage is nearest, and store the coding permutations obtained by receiving nearest satellite waves,

10. a date-time information acquisition method, it is performed by the process portion employing electric wave reception portion, this electric wave reception portion receives satellite waves and the reception sequence of the predetermined format corresponding to this satellite waves received is distinguished, it is characterized in that, described date-time information acquisition method comprises the following steps:

Imagination sequence generation step, generate be assumed to be in advance to carry out described in the imaginary sequence of the part of reception sequence that distinguishes；

Comparison step, by compareing the imaginary sequence of described generation and described reception sequence successively, detects described imagination sequence in described reception sequence；And

Date-time acquisition step, when detecting described imagination sequence in described reception sequence, obtains current time of day according to the detection time of this imagination sequence,