JP5088677B2 - Time correction device, time measuring device with time correction device, and time correction method - Google Patents

Description

  The present invention can correct a time by receiving a radio signal including time information, and can correct a time even in an environment where the signal cannot be received. The present invention relates to an apparatus and a time correction method.

Conventionally, a time correction method using time information of a GPS (Global Positioning System) satellite has been proposed in order to perform time correction with high accuracy. This GPS satellite has an orbit around the earth, and an atomic clock is provided inside. Such GPS satellites have extremely accurate time information (GPS time). For this reason, this time information has been used to correct the time.
On the other hand, a method of correcting a time by receiving a signal such as a long wave standard radio wave and analyzing a time code included in the radio wave signal has been proposed.
Thus, in order to receive radio signals such as signals from GPS satellites and long wave standard radio signals, an extremely accurate and highly accurate clock oscillator is required on the receiver side.

However, driving such a high-accuracy clock oscillator requires a large battery or the like because of the large power consumption. For this reason, it is difficult to mount a time correction device that receives a radio signal that requires a high-speed, high-accuracy clock oscillator and uses time information from the radio signal in a small device such as a watch. It was.
Therefore, normally, such a high-accuracy clock oscillator is driven only when a radio wave signal is received. In other cases, a low-speed clock oscillator with low power consumption is used. Here, the low-speed clock oscillator is, for example, a 32 kHz clock oscillator. This 32 kHz clock oscillator may vary in frequency due to environmental changes such as temperature, but does not have a function of correcting the varied frequency.
For this reason, when the next reception timing is measured using this 32 kHz clock oscillator as a timer, there may be a timing error between the reception time determined by the timer and the actual reception time. Therefore, as a clock oscillator with high frequency accuracy, for example, a mobile radio terminal device that corrects reception timing based on a temperature-compensated crystal oscillator (TCXO) having temperature compensation means has been proposed ( For example, Patent Document 1, paragraph 0010).

  Alternatively, the frequency error of the clock oscillator with low frequency accuracy is detected using a clock oscillator with high frequency accuracy. Then, an RTC circuit for a portable device is proposed in which the detected frequency error is accumulated and a clock is generated when the accumulation is carried up to a specific bit (for example, Patent Document 2, (Paragraph 0011)

Further, the low-accuracy low-speed clock oscillator and the high-accuracy high-speed clock oscillator are obtained for each predetermined time zone to determine the count value of the signal of each clock oscillator. The count value of the high-speed clock oscillator when there is no error in the low-speed clock oscillator is used as a reference. Then, a mobile communication terminal device that corrects the clock signal of the low-speed clock oscillator by expressing how much the positive and negative directions deviate from the reference value by a deviation amount has been proposed (for example, Patent Document 3, Paragraph 0016).
These are all designed to adjust the timing when receiving radio signals, and high-speed and high-accuracy clock oscillators consume a lot of power during operation, so keep them running all the time. Since a large battery or the like that can obtain a large electric power is required, the operation time is limited as much as possible. Usually, a signal is transmitted by a low-speed and low-accuracy clock oscillator with low power consumption, and the timing of reception is counted.
Japanese Patent Laid-Open No. 2000-278752 (paragraph “0010” etc.) JP 2000-315121 A (paragraph “0011” etc.) Patent No. 3730914 (paragraph “0016” etc.)

  However, since the time information generated in the above case is also shifted, it is necessary for the user to correct the time, which is not easy to use.

  Therefore, the present invention provides a time adjustment device, a time adjustment device with a time adjustment device, and a time adjustment method that do not require high power consumption even when ultra-low power is required, and that can automatically and highly accurately correct time. The purpose is to provide.

  According to the present invention, according to the present invention, when receiving a radio signal including time correction information, relatively fast high-speed frequency information that starts driving based on start information and stops driving based on stop information is obtained. A first clock oscillation unit that outputs a high-speed frequency signal based on the low-speed frequency based on low-speed frequency information that is always operating and is relatively slower than the first clock oscillation unit used when generating time information A second clock oscillating unit that outputs a signal, a setting frequency information of the second clock oscillating unit and a comparison of the low-speed frequency information of the second clock oscillating unit during driving of the first clock oscillating unit; A frequency deviation measuring unit that measures the amount of frequency deviation, and the current time information at the time of the current reception of the radio signal from the time information at the time of previous reception that is the time information at the time of the previous reception of the radio signal. A correction time generation unit that generates correction time information based on the elapsed information up to the time information and the frequency deviation amount, and a time correction information acquisition unit that acquires the time correction information from the radio signal, When the time correction information acquisition unit acquires the time correction information, the time information correction unit that corrects the time information based on the time correction information, and the time correction information acquisition unit acquires the time correction information. If not, a time information correction unit that corrects the time information based on the correction time information is provided.

  According to the above configuration, when the time correction information is acquired by receiving the radio signal, the time information is corrected by the time correction information included in the radio signal. When the reception of the radio wave signal cannot be received for some reason and the time correction information is not acquired, the set frequency information and the low-speed frequency of the second clock oscillation unit during the driving of the first clock oscillation unit. A frequency deviation amount that is a difference (frequency deviation amount) from the low-speed frequency information when the signal is output is measured, and correction time information is generated from the frequency deviation amount. The time information can be corrected based on the correction time information.

That is, the first clock oscillation unit that outputs a high-speed frequency signal based on high-speed high-speed frequency information is operated only for a time necessary for receiving a radio wave signal or the like. In other cases, the second clock oscillation unit that outputs a low-speed frequency signal based on the low-speed frequency information is operated, and time information is generated by counting the clocks of the low-speed frequency signal from the second clock oscillation unit. It is like that.
If the radio signal cannot be received, the frequency deviation amount of the second clock oscillating unit is measured, correction time information is generated from the frequency deviation amount, and the time information correction unit performs time based on the correction time information. Temporary time correction for correcting information is performed. When a radio signal including time information can be received, the time information correcting unit corrects the time information generated by the second clock oscillation unit based on the time information of the radio signal.
For this reason, when reception is possible, time information can be corrected accurately, and when reception is not possible, it is based on a frequency shift of the second clock oscillation unit used when generating time information. Therefore, it is possible to provide a time adjustment device with little time deviation.

  Preferably, a frequency correction unit that corrects the low-speed frequency information based on the amount of frequency deviation, and when the first clock oscillation unit is driven, the low-speed frequency information is corrected by the frequency correction unit. The time correction device is characterized in that the time information is generated based on a corrected low frequency signal of the corrected low frequency information.

  According to the above configuration, the low-speed frequency signal is corrected based on the frequency deviation amount by the frequency correction unit. Then, the low-speed frequency signal of the second clock oscillation unit used when generating the time information is corrected when the first clock oscillation unit is driven. For this reason, the amount of time deviation can be reduced.

  Preferably, the low-speed frequency signal based on the low-speed frequency information of the second clock oscillating unit includes a fixed-time frequency correction unit that corrects the low-frequency signal based on the frequency deviation amount at regular intervals. It is a correction device.

  According to the above configuration, the fixed-time frequency correction unit corrects the low-speed frequency signal based on the low-speed frequency information of the second clock oscillation unit at a fixed time, for example, once every 10 seconds. . For this reason, the deviation of the low-speed frequency signal based on the low-speed frequency information of the second clock transmission unit used when generating the time information is reduced, and the deviation of the time information can be reduced.

  Preferably, the low-speed frequency correction data storage unit of the second clock oscillation unit is provided, and the low-speed frequency information of the second clock oscillation unit is data of the low-speed frequency correction data storage unit based on the frequency deviation amount. This time correction device is corrected by rewriting.

  According to the above configuration, the low-speed frequency information of the second clock oscillation unit is corrected by rewriting data in the low-speed frequency correction data storage unit based on the frequency deviation amount. Thus, the amount of deviation of the time information generated can be reduced.

  Preferably, the correction time information is compared with the correction time information of this time, and the correction time amount information at the time of reception, which is the correction amount of the previous time when the time information is corrected based on the time correction information. A threshold time determination unit that determines whether the time is within the range of threshold time information from the correction time amount information at the time of reception, and when the threshold time determination unit determines that the threshold time information is exceeded, The time information is corrected based on the reception correction time amount information and the threshold time information.

  According to the above configuration, the deviation of the low-speed frequency information of the second clock oscillation unit at the time of measurement is too large or smaller than the deviation amount of the average frequency information for a certain time, for example, one day. When the time information is too long, if the time information is corrected with the correction time information calculated based on the amount of deviation at the time of measurement, the amount of time deviation may be increased. Therefore, in order to prevent this, the correction time information is compared with the correction time amount information at the time of reception, which is the correction amount of the time when the time information was corrected last time after successful reception. If the correction time information is within the range of the correction time amount information at the time of reception and the threshold time information, it is assumed that the correction time information is neither too large nor too small. to correct. However, conversely, when it is determined that it is not within the range of the threshold time information, the correction by the correction time information is not performed, and the time information is obtained based on the correction time amount information at the time of reception at the previous reception and the threshold information. Correct it. For this reason, the displayed time information does not deviate greatly.

  Preferably, the first clock oscillating unit is a temperature compensated crystal oscillator (TCXO) including a temperature correcting unit.

  According to the above configuration, since the first clock oscillation unit is a temperature-compensated crystal oscillator (TCXO), a high-accuracy high-speed signal output based on the high-speed frequency information does not occur due to temperature. It is a clock oscillator.

Preferably, in the time correction device, the start information of the first clock oscillation unit is 24 hours after the previous reception time information.
According to the configuration, the start information of the first clock oscillation unit is set in order to start reception of the radio signal every 24 hours. For this reason, time correction can be performed at a fixed time every fixed time. Therefore, the user can select and set an environment where reception is easy, and the time information can be reliably corrected.

Preferably, the time signal correcting device is characterized in that the radio signal is a satellite signal from a position information satellite.
According to the above configuration, the radio signal is a satellite signal from the position information satellite. Therefore, it is possible to use the time adjustment device even in different environments.

  According to the present invention, according to the present invention, when receiving a radio signal including time correction information, relatively fast high-speed frequency information that starts driving based on start information and stops driving based on stop information is obtained. A first clock oscillation unit that outputs a high-speed frequency signal based on the low-speed frequency based on low-speed frequency information that is always operating and is relatively slower than the first clock oscillation unit used when generating time information A second clock oscillating unit that outputs a signal, a setting frequency information of the second clock oscillating unit and a comparison of the low-speed frequency information of the second clock oscillating unit during driving of the first clock oscillating unit; A frequency deviation measuring unit that measures the amount of frequency deviation, and the current time information at the time of the current reception of the radio signal from the time information at the time of previous reception that is the time information at the time of the previous reception of the radio signal. A correction time generation unit that generates correction time information based on the elapsed information up to the time information and the frequency deviation amount, and a time correction information acquisition unit that acquires the time correction information from the radio signal, When the time correction information acquisition unit acquires the time correction information, the time information correction unit that corrects the time information based on the time correction information, and the time correction information acquisition unit acquires the time correction information. And a time information correction unit that corrects the time information based on the correction time information when there is no time correction device.

  According to the present invention, according to the present invention, when receiving a radio signal including time correction information, relatively fast high-speed frequency information that starts driving based on start information and stops driving based on stop information is obtained. A first clock oscillation unit that outputs a high-speed frequency signal based on the low-speed frequency based on low-speed frequency information that is always operating and is relatively slower than the first clock oscillation unit used when generating time information A time adjustment method of a time adjustment device comprising: a second clock oscillation unit that outputs a signal, wherein the second clock oscillation unit is operating and the second clock during driving of the first clock oscillation unit The frequency deviation measuring step for comparing the low-speed frequency information of the oscillating unit to measure the frequency deviation amount and the time information on the previous reception which is the time information at the time of the previous reception of the radio wave signal. A correction time generating step for generating correction time information based on the elapsed information up to the current time information which is the time information at the time of the current reception of the signal and the frequency deviation amount; and the time correction information from the radio signal. A time correction information acquisition step to be acquired; a time information correction step of correcting the time information based on the time correction information when the time correction information acquisition unit acquires the time correction information; and the time correction information. A time correction method for a time correction apparatus, comprising: a time information correction step of correcting the time information by the correction time information when the acquisition unit does not acquire the time correction information.

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
The embodiments described below are preferred specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

(First embodiment)
FIG. 1 is a schematic diagram showing a timepiece with a time correction device according to the present invention, for example, a wristwatch 10 with a GPS time correction device (hereinafter referred to as “GPS wristwatch”), and FIG. 2 is a schematic cross section of FIG. FIG. FIG. 3 is a schematic diagram showing the main hardware configuration of the GPS wristwatch 10 of FIGS. 1 and 2.
As shown in FIGS. 1 and 2, the GPS wristwatch 10 displays a time display unit on which a dial 12, a second hand, a minute hand, an hour hand and other hands 13 are arranged, and various messages of latitude and longitude. A display 14 including an LCD display panel is formed. The display 14 displays message information as well as position information such as latitude, longitude, and city name. The pointer 13 is driven through a gear by a step motor including a motor coil 18 and the like.

As shown in FIG. 2, the GPS wristwatch 10 has an antenna 11. The antenna 11 is one of the configurations of the receiving unit 44 (see FIG. 3). This antenna 11 is a patch antenna that receives satellite signals from GPS satellites 15 or the like orbiting the earth over a predetermined orbit. The antenna 11 is disposed on the surface of the dial 12 opposite to the time display surface. The dial 12 is formed of plastic or the like that is a material that transmits radio waves that are signals from GPS satellites.
The GPS satellite 15 is an example of a position information satellite.

Further, the case 21 which is an exterior is made of a metal such as SUS or titanium or a plastic, and in particular, when it is made of a plastic, the reception characteristics are improved. The battery 22 is a secondary battery such as a lithium ion battery. A magnetic sheet 19 is disposed below the battery 22, and a charging coil 20 is disposed through the magnetic sheet 19. Therefore, the battery 22 can be charged with electric power from the external charger by the charging coil 20. Further, the magnetic sheet 19 can bypass the magnetic field. For this reason, the magnetic sheet 19 can reduce the influence of the battery 22 and can perform energy transmission efficiently. And the back glass part 17b is arrange | positioned in the center part of the back cover 23 for electric power transfer.
The GPS wristwatch 10 is configured as described above.

As shown in FIG. 3, the GPS wristwatch 10 includes a time display device 45, a reception unit 44, and a time adjustment device 40, and has a configuration that also functions as a computer. Further, the display 14 shown in FIGS. 1 and 2 is also connected.
Hereinafter, each configuration shown in FIG. 3 will be described.
As shown in FIG. 3, the GPS wristwatch 10 includes a receiving unit 44 (for example, a GPS device), and receives a signal received from the GPS satellite 15 of FIG. 1 from the antenna 11 through a filter (SAW) 26 or an RF unit (Radio Frequency). : Radio frequency) 30 and the baseband unit 31 extracts the signal.
That is, the filter (SAW) 26 is a band-pass filter and extracts a 1.5 GHz satellite signal. The satellite signal extracted in this manner is amplified by the LNA 27, mixed, and down-converted to IF (intermediate frequency). The clock signal for the PLL circuit 28 is generated from a temperature compensated crystal oscillator (TCXO) 35. It passes through the IF filter and IF amplifier and is converted to a digital signal by an ADC (A / D converter) 29. The baseband unit 31 calculates satellite signals based on the control signal. Time data and positioning data obtained by the baseband unit 31 are stored in the storage unit 39, and the corrected time information is displayed through the drive circuit 43.

Thus, the receiving unit 44 includes the RF unit 30 and the baseband unit 31, and the RF unit 30 includes the PLL circuit 28, the LNA 27, the ADC (A / D converter) 29, and the like.
The baseband unit 31 includes a DSP (Digital Signal Processor) 32, a CPU (Central Processing Unit) 33a, an SRAM (Static Random Access Memory) 34, a temperature-compensated crystal oscillator (TCXO) 35, a flash memory 36, and the like. Is also connected.

The timepiece control unit 37 is configured to send a control signal to the reception unit 44, and the reception operation of the reception unit 44 can be controlled via the timepiece control unit 37.
The time adjustment device 40 is an example of a time information generation unit that generates time information by counting the frequency vibration of the clock oscillator 38 based on the 32.768 kHz water vibration vibrator 38 a provided in the clock control unit 37. A time counter 41 is provided. In addition, a clock deviation amount measuring circuit 42, a storage unit 39, and a CPU 33b for measuring a deviation amount, which is a variation in frequency information of the clock oscillator 38 based on the crystal resonator 38a, based on the TCXO 35 are provided. The timepiece control unit 37 corrects the display time information of the time display device 45 via the drive circuit 43 and displays it.
That is, the timepiece mechanism in the present embodiment is a so-called electronic timepiece.

  The receiving unit 44 receives a radio signal including time information, and the satellite signal transmitted from the position information satellite (for example, the GPS satellite 15) is an example of a radio signal including time information. ing. The display time data displayed on the pointer 13 of the dial 12 of the time display device 45, the display 14 or the like is corrected based on the time information obtained from the radio signal when the radio signal is received. It is also like. That is, the display time data displayed on the pointer 13 of the dial 12 of the time display device 45, the display 14 or the like is data based on the count data of the time counter 41. That is, this time counter 41 generates a clock by counting based on a frequency signal of a clock oscillator 38 (hereinafter also simply referred to as a clock oscillator 38) based on a crystal resonator 38a, which normally consumes less power. Then, display time data to be displayed on the pointer 13 of the dial 12 of the time display device 45 or the display 14 is generated. The clock oscillator 38 is an example of a second clock oscillation unit. The clock oscillator 38 outputs a low-speed frequency signal based on the low-speed frequency information and consumes less power. Therefore, the clock oscillator 38 is always driven to generate display time data. . Here, the frequency information of the clock oscillator 38 is data based on the 32.768 kHz crystal oscillator 38a, and the frequency signal of the clock oscillator 38 is generated based on the 32.768 kHz crystal oscillator 38a. It has come to be.

However, the clock oscillator 38 has a difference in frequency information depending on the surrounding environmental conditions such as temperature, and the frequency signal generated based on the frequency information also includes a shift. Then, if display time data is generated based on this frequency signal, an error occurs in the display time.
Therefore, in order to prevent an error in the display time data, if the high-accuracy and high-speed TCXO 35 used when the reception unit 44 receives the oscillator for generating the reference clock is used, the power consumption increases, and the wristwatch It is not suitable for small electronic devices such as the above. For this reason, a clock oscillator 38 is used as an oscillator that is always driven and generates a reference clock, and the time lag is corrected by the time information of the satellite signal of the GPS satellite 15, for example. .
Here, the TCXO 35 is an example of a first clock oscillation unit, and the clock oscillator 38 is an example of a second clock oscillation unit. The TCXO 35 outputs a high-accuracy and high-speed frequency signal based on the frequency information, and is driven only when the receiving unit 44 receives the GPS satellite 15.
In the present embodiment, even when time information included in a satellite signal from a position information satellite such as the GPS satellite 15 cannot be received, the display time data is configured to be always over. We try to prevent information gaps from becoming large.

4 to 8 are schematic diagrams showing the main software configuration and the like of the GPS wristwatch 10, and FIG. 4 is an overall view.
As shown in FIG. 4, the GPS wristwatch 10 has a control unit 51. The control unit 51 includes various program storage units 60, various data storage units 70, various clock correction programs 80, and various clock correction data storages. It has the structure which has the part 90. FIG.
The various programs in the various program storage units 60 shown in FIG. 4 are mainly configured to process various data in the various data storage units 70. The various programs in the various program storage units 80 for clock correction are as follows. Mainly, it is configured to process various data in the various data storage unit 90 for clock correction.
In FIG. 4, various program storage units 60, various data storage units 70, various clock correction program storage units 80, and various clock correction data storage units 90 are shown separately. The data is not stored separately, but is shown separately for convenience of explanation.
The various program storage unit 60 and various data storage unit 70 in FIG. 4 mainly store various programs and various data used when processing the time information of the received satellite signals when receiving the satellite signals from the GPS satellites 15. Are listed together. The various clock correction program storage unit 80 and the various clock correction data storage unit 90 mainly describe various programs and various data related to the case where the satellite signal cannot be received.

FIG. 5 is a schematic diagram showing data in the various program storage units 60 of FIG. 4, and FIG. 6 is a schematic diagram showing data in the various data storage units 70 of FIG. FIG. 7 is a schematic diagram showing data in the clock correction various program storage unit 80 of FIG. FIG. 8 is a schematic diagram showing data in various data storage units 90 for clock correction in FIG.
FIG. 9 is a schematic flowchart showing main operations and the like of the GPS wristwatch 10 according to the present embodiment.

  Hereinafter, the operation of the GPS wristwatch 10 according to the present embodiment will be described according to the flowchart of FIG. 9, and the various programs and data of FIGS.

First, in ST1 of FIG. 9, it is determined whether it is a reception timing.
Specifically, the reception timing determination program 61 in FIG. 5 refers to the reception timing data 77 in FIG. 6 and determines whether the elapsed time from the previous reception time data 71 in FIG. 6 is the reception timing. For example, the reception timing data 77 is set every 24 hours from the previous reception time. The previous reception time is stored in the previous reception time data 71 of FIG. Therefore, if the reception timing data 77 in FIG. 6 has not been reached since the previous reception time, the count is continued until it is reached.
Here, the count data is counted based on a frequency signal of a clock oscillator 38 (see FIG. 3) which is an example of a second clock oscillation unit described later. The clock oscillator 38 counts based on the frequency signal by the time information generation program 68 of FIG. The generated time data 76 is reference data for time displayed on the hands 13 and the display 14 of the GPS wristwatch 10. The time data when the reception timing is reached is stored in the current reception time data 72 in FIG.

  On the other hand, if it is the reception timing, the process proceeds to ST2 to start searching for GPS satellites. Specifically, the satellite reception start program 62 in FIG. 5 searches for GPS satellites 15 that can be synchronized by adjusting the generation timing of the C / A code pattern of the GPS satellites 15.

Next, the process proceeds to ST3, and when the satellite reception start program 62 is started, the driving of the high-precision clock is started. Specifically, the high-precision clock drive start program 63 in FIG. 5 starts driving the TCXO 35 (see FIG. 3) and outputs a high-speed frequency signal. The baseband unit 31 (see FIG. 3) A clock is generated at the timing of the high-speed frequency signal, and the satellite signal from the GPS satellite 15 is received.
As described above, the TCXO 35 is provided with temperature compensation, has no frequency fluctuation due to temperature, and can generate an accurate clock signal based on a high-accuracy and high-speed frequency signal. However, since the power consumption is large, it is not always driven and is driven only when a satellite signal from the GPS satellite 15 is received.

Then, the process proceeds to ST4. In ST4, the frequency correction amount measurement program 81 in FIG. 7 measures the deviation amount of the clock oscillator 38 (see FIG. 3) based on the TCXO 35 (see FIG. 3) to obtain frequency correction amount data. .
That is, the TCXO 35 outputs a high-accuracy and high-speed frequency signal based on the frequency information, and is driven only when the receiving unit 44 (see FIG. 3) receives the GPS satellite 15. ing. Since the TCXO 35 has a temperature compensation circuit, the frequency information does not vary depending on the temperature (see FIG. 10).
Therefore, based on the TCXO 35, the frequency information of the clock oscillator 38 at the reception timing is measured and stored in the reception frequency data 92 of FIG. Here, the frequency information at the time of setting the clock oscillator 38 (see FIG. 3) is stored in the setting frequency data 91 of FIG. The frequency information at the time of setting is initial frequency information, and is frequency information near room temperature (for example, about 20 ° C. to 30 ° C.) (see FIG. 10).
Then, the frequency correction amount measurement program 81 in FIG. 7 compares the setting frequency data 91 and the reception frequency data 92 to measure the frequency deviation amount (also referred to as deviation amount or frequency deviation). The amount is stored as frequency correction amount data 93. Thus, the amount of frequency deviation of the clock oscillator 38 at the time of reception can be measured. Here, referring to FIG. 10, the frequency deviation, which is the amount of frequency deviation, is 0 near room temperature (for example, about 20 ° C. to 30 ° C.), and a parabola is drawn around the room temperature as a vertex. Yes. Therefore, the frequency deviation shifts in the negative direction when the temperature is higher or lower than normal temperature. The frequency deviation is measured on the order of ppm.

Next, the process proceeds to ST5. In ST5, it is determined whether a fixed time has elapsed. The fixed time is an example of stop information for determining that the environment cannot be received when the GPS satellite 15 is searched but the GPS satellite cannot be captured even after a certain period of time has passed. That is, when the GPS satellite 15 is received, the TCXO 35 is driven as described above, but this consumes a large amount of power. Therefore, it is not preferable to drive the TCXO 35 indefinitely because the power is insufficient and the power supply to other devices of the GPS wristwatch 10 is insufficient. Accordingly, a fixed time as stop information is set, and if the GPS satellite 15 cannot be captured even after this time has elapsed, reception is stopped.
Specifically, the reception stop determination program 65 in FIG. 5 refers to the reception stop data 73 in FIG. 6 and determines whether a fixed time that is the reception stop time has elapsed.
If it is determined in ST5 that the fixed time has not elapsed, the process proceeds to ST6 and it is determined whether the GPS satellite 15 has been captured. If not captured, the process returns to ST2. If captured, the process proceeds to ST7.

In ST7, it is determined whether time-related information has been acquired from the satellite signal. The satellite time information acquisition program 66 in FIG. 5 receives the satellite signal from the GPS satellite 15 and determines whether the time-related information included in this satellite signal can be acquired. If time-related information cannot be acquired, the process returns to ST2. If time-related information can be acquired, the process proceeds to ST8.
In ST8, the satellite time information acquisition program 66 in FIG. 5 stores the acquired time related information as the corrected time data 74 in FIG.

  Then, the process proceeds to ST9, the reception of the GPS satellite 15 is stopped, and the satellite search is terminated. Then, the high precision clock drive stop program 64 in FIG. 5 stops the drive of the TCXO 35 (see FIG. 3).

  Next, proceeding to ST10, the display time information is corrected based on the correction time data 74 of FIG. That is, the display time information correction program 67 of FIG. 5 corrects the generation time data 76 of FIG. 6 based on the correction time data 74 of FIG. 6, and stores the corrected time data as the display time data 75 of FIG. . And based on the display time data 75 of FIG. 6, it is displayed on the hands 13 and the display 14 of the wristwatch 10 with GPS.

Here, the satellite signal from the GPS satellite 15 will be described.
As shown in FIG. 11A, a signal is transmitted from the GPS satellite 15 in units of one frame (30 seconds). This one frame has five subframes (one subframe is 6 seconds). Each subframe has 10 words (1 word is 0.6 seconds).
The head word of each subframe is a TLM word in which TLM (Telemetry word) data is stored. Preamble data is included in the head of the TLM word as shown in FIG. 11B. Is stored.
Further, the word following the TLM is a HOW word in which HOW (hand over word) data is stored, and at the top of the word is GPS time information (Z count) which is time related information of a GPS satellite called TOW (Time of Week). Is stored.
This Z count stores the time of the start portion of the TLM of the next subframe.
The GPS time is displayed in seconds since 0:00 every Sunday, and returns to 0 at 0:00 on the next Sunday. Thus, by referring to the HOW word that is the second word of the subframe, it is possible to acquire the Z count that is GPS time information.
As described above, in the present embodiment, GPS time information that is time-related information is acquired, and time correction is performed.

  On the other hand, if it is determined in ST5 that the fixed time has elapsed, the process proceeds to ST11. In this case, the GPS satellite 15 cannot be captured, and time-related information cannot be stored as the corrected time data 74 in FIG. Then, the high-accuracy clock stop program 64 in FIG. 5 stops driving the TCXO 35 (see FIG. 3).

  Next, the process proceeds to ST12. In ST12, the time correction amount is calculated from the elapsed time from the previous reception time (for example, 24 hours here) and the frequency correction amount data. That is, the correction time information calculation program 82 in FIG. 7 obtains the elapsed time from the previous reception time data 71 and the current reception time data 72 in FIG. 6, and the time correction amount is calculated from the frequency correction amount data 93 in FIG. The Here, since the elapsed time is based on the reception timing data 77, it is 24 hours. For example, the frequency correction amount data 93 is 5.8 ppm. The elapsed time from the previous reception time is 24 hours. Then, the frequency deviation of the clock oscillator 38 (see FIG. 3) is a frequency deviation of 5.8 ppm in 24 hours. Therefore, when 24 hours are converted to seconds and 5.8 ppm is integrated and calculated, the time correction amount is about 0.5 seconds.

  Next, proceeding to ST13, the calculated time correction amount is stored as calculated correction time data. That is, the calculated time correction amount, here, for example, 0.5 seconds is stored as the calculated correction time data 94 in FIG.

  Then, the process proceeds to ST14, and the display time information is corrected with the calculated correction time data 94 of FIG. Specifically, the display time information correction program 83 in FIG. 7 corrects the generation time data 76 in FIG. 6 based on the calculated correction time data 94 in FIG. 8, and the corrected time data is displayed in the display in FIG. The time data 75 is stored. And based on the display time data 75 of FIG. 6, it is displayed on the hands 13 and the display 14 of the wristwatch 10 with GPS.

That is, the reception timing data 77 in FIG. 6 is an example of start information, and the reception stop data 73 in FIG. 6 is an example of stop information. 6 is an example of time correction information from a radio signal. The TCXO 35 in FIG. 3 is an example of a first clock oscillation unit. 3 is an example of the second clock oscillation unit.
The TCXO 35 starts driving by the high-precision clock driving start program 63 and stops driving by the high-precision clock stopping program 64 when receiving the radio signal. The clock oscillator 38 is always used to generate time information.

Further, the frequency correction amount measurement program 81 in FIG. 7 is an example of a frequency deviation measurement unit, and the correction time information calculation program 82 is an example of a correction time generation unit.
Then, the frequency correction amount measurement program 81 compares the setting frequency data 91 (an example of setting frequency information) and the reception frequency data 92 (an example of low frequency information) in FIG. (An example of a frequency deviation amount) is measured. Further, the correction time information calculation program 82 in FIG. 7 includes the previous reception time data 71 (an example of the previous reception time information), the current reception time data 72 (an example of the current time information), and the frequency correction amount in FIG. Based on the data 93 (an example of the frequency deviation amount), the calculation correction time data 94 (an example of the correction time information) of FIG. 8 is generated.
8 is an example of the frequency correction data storage unit, and the data is rewritten based on the frequency correction amount data 93 (an example of the frequency deviation amount) in FIG. It is supposed to be.

  6 can be acquired, the display time information correction program 67 of FIG. 5 corrects the display time information based on the correction time data 74. Then, the time information generation program 68 in FIG. 5 outputs a frequency signal based on the frequency information of the clock oscillator 38 that is always driven, generates time information by counting the frequency signal, and generates the time information in FIG. Stored as generation time data 76. This generation time data 76 is the basis of display time information. Then, the display time information correction program 67 of FIG. 5 corrects the generation time data 76 based on the correction time data 74 of FIG.

On the other hand, when the correction time data 74 in FIG. 6 cannot be acquired, the display time information correction program 83 in FIG. 7 corrects the display time information with the calculated correction time data 94.
Therefore, according to the first embodiment, when the satellite signal (an example of the radio signal) from the GPS satellite 15 is received and the correction time data 74 (an example of the time correction information) is acquired, the correction time data 74, the generation time data 76 (an example of time information) is corrected.

A schematic image of the correction of the display time data 75 of the above process is shown in FIG. In FIG. 12, the vertical axis represents the amount of time deviation, and the horizontal axis represents the elapsed time. And the reception timing which is a timing of time information correction is set every 24 hours. Therefore, it is an image in which the GPS satellite 15 is searched once a day for time correction. The clock oscillator 38 (see FIG. 3) is always driven to generate display time information. The clock oscillator 38 generates a time lag during the day. As described above, this is because the frequency is shifted from the environmental condition such as temperature (see FIG. 10). In other words, even during 24 hours of the day, the GPS time varies depending on whether the user wears the GPS wristwatch 10 on his / her arm, when it is not worn, and the ambient temperature of the GPS wristwatch 10. The temperature state of the wristwatch 10 changes, and as a result, the amount of time deviation is not constant (see FIG. 10). 12 (a) and 12 (c) are images when the satellite signal of the GPS satellite 15 is successfully received. In this case, the display time information correction program 67 of FIG. Is corrected based on the correction time data 74. On the other hand, FIG. 12B shows a case where reception of the GPS satellite 15 has failed. In this case, as described above, the display time information correction program 83 of FIG. Correct by
Therefore, even when reception is not possible in this way, the time information is corrected to reduce the amount of display time shift, which is convenient for the user.

  The above flow chart can also be described with a circuit configuration as shown in FIG. The clock oscillator 38 of FIG. 13 transmits a source signal of 32.768 kHz as the set-time frequency data 91 (see FIG. 8). However, since the clock oscillator 38 and the like are derived from the crystal resonator 38a without a temperature compensation circuit or the like, the frequency thereof changes depending on the temperature or the like (see FIG. 10). Therefore, the clock oscillation amount measurement circuit 42 measures the signal oscillated by the clock oscillator 38 based on the clock count data from the TCXO (temperature compensated crystal oscillator) 35 shown in FIG. Then, the measurement result of the clock deviation amount measurement circuit 42 is sent to the correction amount calculation circuit 50. When the correction amount calculation circuit 50 calculates the frequency correction amount data, the information is sent to the frequency correction circuit 48, and the frequency correction circuit 48 generates a clock of the clock oscillator 38 based on the correction amount data. The data is corrected, the corrected data is sent to the time counter 41, and the display time information is corrected. The embodiment of the present invention may be configured as described above.

(Second Embodiment)
FIGS. 14 and 15 are schematic block diagrams showing a partial configuration of a GPS wristwatch 10a (see FIG. 1) according to the second embodiment of the present invention, and FIG. 16 is a diagram with GPS according to the present embodiment. It is a schematic flowchart for demonstrating operation | movement of the wristwatch 10a.
Since the configuration of the GPS wristwatch 10a according to the present embodiment is similar to the configuration of the GPS wristwatch 10 according to the first embodiment described above, the description of the common configuration is omitted with the same reference numerals. Hereinafter, the differences will be mainly described. Since the schematic block diagrams of the various program storage units 60 in FIG. 5 and the various data storage units 70 in FIG. 6 are the same as those in the first embodiment, refer to FIGS. 5 and 6 when used in the description. The description is omitted. Also, the schematic flowchart of FIG. 16 is identical in many configurations to the schematic flowchart according to the first embodiment (see FIG. 9), and thus the description of the same steps is omitted.
That is, the second embodiment is different from the first embodiment in that ST20 is added as the next step of ST10 and the next step of ST14 in the schematic flowchart of FIG. In this connection, a frequency correction program 84 is added to the various types of clock correction program storage unit 80a shown in FIG. Further, post-correction frequency data 95 is added in the various clock correction data storage unit 90a of FIG.
That is, in the process according to the second embodiment, the process from ST1 to ST10 and the process from ST11 to ST14 in the schematic flowchart of FIG. 9 according to the first embodiment are the same, and ST20 is further added. Is different. Hereinafter, the differences will be mainly described.

In the second embodiment, the reception is successful in ST10, the display time information is corrected based on the satellite time information, and the reception is not successful, and the display is performed based on the calculated correction time information data in ST14. After correcting the time information, the process proceeds to ST20.
In ST20, the frequency of the clock oscillator 38 in FIG. 3 is corrected based on the frequency correction amount data. Specifically, the frequency correction program 84 in FIG. 14 corrects the frequency correction amount data 93 that is the frequency information of the clock oscillator 38 based on the frequency correction amount data 93 in FIG. 15, and the corrected frequency in FIG. Store as data 95. Based on the corrected frequency data 95, the frequency signal of the clock oscillator 38 is corrected, and generation time data 76 is generated.

That is, FIG. 17 shows a schematic image of correction of the display time data 75 (see FIG. 6) and frequency correction of the clock oscillator 38 (see FIG. 3) of the present embodiment.
FIG. 17A is a schematic image of the correction of the display time data 75, where the vertical axis is the amount of time deviation and the horizontal axis is the elapsed time. FIG. 17B is a schematic image of frequency correction of the clock oscillator 38.
And the reception timing which is a timing of time information correction is set every 24 hours. Accordingly, the image is searched for the GPS satellite 15 once a day to correct the time. The clock oscillator 38 is always driven to generate time information for display. The clock oscillator 38 generates a time lag during the day. As described above, this is because the frequency is shifted from the environmental condition such as temperature (see FIG. 10). 17 (A) and 17 (c) are images when the satellite signal of the GPS satellite 15 is successfully received. In this case, as described in the first embodiment, FIG. 5 corrects the display time information based on the correction time data 74 of FIG.
At this timing, as shown in FIG. 17B, the frequency of the clock oscillator 38 is corrected by the above-described frequency correction program 84 in FIG. 14 ((a1), (c1) in FIG. 17B). ).

On the other hand, (b) of FIG. 17 (A) is a case where the reception of the GPS satellite 15 has failed. In this case, as described in the first embodiment, the display time information correction program of FIG. 83 corrects the display time information with the calculated correction time data 94.
In this case, the frequency of the clock oscillator 38 is similarly corrected by the frequency correction program 84 shown in FIG. 14 ((b1) in FIG. 17B).

  That is, in the second embodiment, the frequency correction program 84 (frequency) for correcting the reception frequency data 92 (an example of low-speed frequency information) of the clock oscillator 38 based on the frequency correction amount data 93 (an example of the frequency deviation amount). An example of a correction unit). When the TCXO 35 (an example of the first clock oscillation unit) is driven, the reception frequency data 92 is corrected frequency data 95 (an example of corrected low frequency information) corrected by the frequency correction program 84. The generation time data 76 (an example of time information) is generated based on the frequency signal of the corrected frequency data 95 (an example of a corrected low frequency signal). For this reason, the amount of time deviation can be reduced.

(Third embodiment)
18 and 19 are schematic block diagrams showing the main configuration of a GPS wristwatch 10b (see FIG. 1) according to the third embodiment of the present invention, and FIG. 20 shows a GPS wristwatch according to the present embodiment. It is a partial schematic flowchart for demonstrating operation | movement of 10b.
Since the configuration of the GPS wristwatch 10b according to the present embodiment is similar to the configuration of the GPS wristwatches 10 and 10a according to the first and second embodiments described above, the configuration is the same. The description will be omitted with the same reference numerals, etc., and the following description will focus on the differences.
Since the schematic block diagrams of the various program storage units 60 in FIG. 5 and the various data storage units 70 in FIG. 6 are the same as those in the first embodiment, refer to FIGS. 5 and 6 when used in the description. The description is omitted.
The third embodiment is different from the second embodiment in that ST30 and ST31 are performed in the partial schematic flowchart of FIG. 20 when the reception timing is not reached in the step ST1. Is a point. In this connection, a frequency correction period count program 85 and a constant time frequency correction program 86 are added to the various types of clock correction program storage unit 80b shown in FIG. Further, frequency correction period data 96 is added in the various clock correction data storage unit 90b of FIG.
The other processes are the same as those in the second embodiment. That is, when the reception timing is ST1, the following steps ST2 to ST14 and ST20 are performed. Since these steps have been described in the first and second embodiments, a description thereof will be omitted.
Hereinafter, the differences will be mainly described.

In ST1, it is determined whether it is a reception timing. Specifically, since it has been described in the first embodiment, a description thereof will be omitted. If it is determined in ST1 that the reception timing is not reached, the process proceeds to ST30. Here, the frequency correction period count program 85 in FIG. 18 refers to the frequency correction period data 96 in FIG. 19 and determines whether the frequency correction period has elapsed. The frequency correction period data 96 is, for example, about 10 seconds, and the frequency correction period is counted by the generation time data 76 of FIG. 6 generated by the clock oscillator 38 (see FIG. 3).
If the frequency correction period has elapsed, the process proceeds to ST31, where the fixed time frequency correction program 86 of FIG. 18 corrects the frequency information of the clock oscillator 38 with the frequency correction amount data 93 of FIG. The frequency correction amount data 93 is a frequency correction amount at the time of the previous reception.
Then, the process returns to ST1. Then, the following steps ST2 to ST14 and ST20 are performed.

  That is, in the third embodiment, the frequency signal based on the frequency information of the clock oscillator 38 (an example of the second clock oscillating unit) is converted into the frequency correction amount data 93 (an example of the frequency deviation amount) every time a certain time elapses. A fixed-time frequency correction program 86 (an example of a fixed-time frequency correction unit) that corrects based on the above. For this reason, the deviation of the time information is also reduced by reducing the deviation of the frequency signal based on the frequency information of the clock oscillator 38 (an example of the second clock transmission unit) used when generating the time information. It is possible to continue.

(Fourth embodiment)
21 and 22 are schematic block diagrams showing the main configuration of a GPS wristwatch 10c (see FIG. 1) according to the fourth embodiment of the present invention, and FIG. 23 is a GPS wristwatch according to the present embodiment. 10c is a partial schematic flowchart for explaining the operation of 10c.
Since the configuration of the GPS wristwatch 10c according to the present embodiment is similar to the configuration of the GPS wristwatches 10 and 10a according to the first and second embodiments described above, a common configuration The description will be omitted with the same reference numerals, etc., and the following description will focus on the differences.
Since the schematic block diagrams of the various program storage units 60 in FIG. 5 and the various data storage units 70 in FIG. 6 are the same as those in the first embodiment, refer to FIGS. 5 and 6 when used in the description. The description is omitted.
The fourth embodiment is different from the second embodiment in that, in the partial schematic flowchart of FIG. 23, the step ST40 is added after the step ST10 and before the step ST20. After ST13, the process of ST42 and the processes of ST43 and ST44 are added.
In this connection, a correction amount threshold determination program 87, a threshold correction time calculation program 88, and a display time information threshold correction program 89 are added in the various types of clock correction program storage unit 80c in FIG. In addition, threshold data 97, reception correction time data 98, and threshold correction time amount data 99 are added to the various clock correction data storage unit 90c of FIG.
The other processes are the same as those in the second embodiment. That is, the process from ST1 to ST5, the process of proceeding from ST5 to ST10, the process of ST20, the process from ST11 to ST13, and the process of ST14 have been described in the first and second embodiments, and will be omitted.
Hereinafter, the difference will be mainly described.

  As shown in FIG. 23, in the fourth embodiment, the process proceeds to ST40 through the process of ST10 described in the schematic flowchart of the second embodiment. In ST40, the correction amount of the display time information is stored as reception correction time data 98 in FIG. That is, the correction amount of the time when the display time information is corrected based on the satellite time information is stored as reception correction time data 98 in FIG. Then, the process proceeds to step ST20. This step is as described above in the second embodiment.

Further, after the process of ST13, the process proceeds to ST41. The process of ST41 is a part of the process when the GPS satellite 15 cannot be received.
In ST41, the time correction amount data at the time of successful reception of the previous satellite and the calculated correction time data are compared. That is, the correction amount threshold value judgment program 87 in FIG. 21 compares the reception correction time data 98 and the calculated correction time data 94 in FIG.
Then, the process proceeds to ST42, and it is determined whether the calculated correction time data 94 is within the threshold time from the reception correction time data 98. That is, the correction amount threshold value judgment program 87 in FIG. 21 compares the calculated correction time data 94 in FIG. 22 with the reception correction time data 98 in FIG. 22, and this difference is within the range of the threshold data 97 in FIG. Judge. The threshold data 97 has a value of about ± 0.5 seconds, for example, and is data resulting from the accuracy of the clock oscillator 38 (see FIG. 3).

If it is determined in ST42 that it is within the range, the process proceeds to ST14. This step is as described in the first and second embodiments. The subsequent steps are the same as those in the second embodiment.
On the other hand, if it is determined in ST42 that it is not within the range, the process proceeds to ST43. In ST43, the threshold time is added to the reception correction time data 98 and stored as threshold correction time amount data 99. Specifically, the threshold correction time calculation program 88 of FIG. 21 adds the threshold data 97 to the reception correction time data 98 of FIG.

Then, the process proceeds to ST44. In ST44, the display time information is corrected based on the threshold correction time amount data 99 of FIG. Specifically, the display time information threshold correction program 89 in FIG. 21 corrects the generation time data 76 in FIG. 6 with reference to the threshold correction time amount data 99 in FIG. 22, and the display time data 75 in FIG. Remember as. Based on the display time data 75, the hands 13 and the display 14 of the GPS wristwatch 10 are displayed.
Next, in ST20, the frequency information of the clock oscillator 38 is corrected. This step is the same as described in the second embodiment.

That is, in the fourth embodiment, reception correction time data 98 (an example of reception correction time amount information) that is the correction amount of the previous time corrected based on the correction time data 74 (an example of time correction information) and The current calculated correction time data 94 (an example of correction time information) is compared. Then, the correction amount threshold determination program 87 (an example of a threshold time determination unit) determines whether the calculated time data 94 is within the range from the correction time data 74 to the threshold data 97 (an example of threshold time information).
If the correction amount threshold value determination program 87 determines that the threshold value data 97 is exceeded, the threshold value correction time calculation program 88 uses the threshold value correction time amount data 98 based on the correction time data 98 and threshold value data 97 during reception. 99 is calculated. The display time information threshold correction program 89 corrects the generation time data 76 that is time information based on the threshold correction time amount data 99. Therefore, the generation time data 76 that is time information is corrected based on the reception correction time data 98 and the threshold data 97.

Therefore, for example, the frequency correction amount data 93, which is a deviation of frequency information of the clock oscillator 38 (an example of the second clock oscillation unit) at the time of measurement (at the time of reception), is a certain time, for example, an average deviation of a day. Consider a case where it is too large, or conversely, it is too small. In this case, when the generation time data 76 (an example of time information) is corrected by the calculated correction time data 94 (an example of correction time information) calculated based on the frequency correction amount data 93, the time shift amount is reversed. May become large.
Therefore, in order to prevent this, the calculated correction time data 94 (an example of correction time information) is compared with reception correction time data 98 (an example of reception correction time amount information), which is the correction amount of the previous time. If the calculated correction time data 94 is within the range of the reception correction time data 98 to the threshold data 97, the time information is corrected with the calculated correction time data 94.
On the contrary, if it is determined that it is not within the range of the threshold data 97, the correction by the calculated correction time data 94 is not performed, and the reception correction time data 98 and the threshold data 97 at the time of the previous reception are used. The generation time data 76 is corrected. For this reason, the displayed time information does not deviate greatly.

In each of the above-described embodiments of the present invention, the reception timing is described by taking as an example a setting that is performed every fixed time, for example, every 24 hours. Instead, the GPS wristwatch 10 may include an environment determination unit that determines whether or not the external environment of the GPS wristwatch 10 is an easily receivable environment. In this case, the GPS wristwatch 10 or the like may have an indoor / outdoor determination unit such as a temperature measurement device, a solar power generation amount detection device, an acceleration measurement device, and the like. In such a case, it may be configured to receive.
Each of the above-described embodiments has been described with respect to GPS satellites. However, the present invention is not limited to GPS satellites, but is limited to other global navigation satellite systems (GNSS) such as Galileo and GLONASS, SBAS, A position information satellite such as a zenith satellite that transmits a radio signal that is a satellite signal including time information may be used. Alternatively, a radio wave signal including time information such as a long wave standard radio wave may be used.
The present invention is not limited to the above-described embodiments.

It is the schematic which shows the wristwatch with a GPS time correction apparatus which is a time measuring apparatus with a time correction apparatus which concerns on this invention, for example. FIG. 2 is a schematic end view of the wristwatch with a GPS time correction device in FIG. 1. It is the schematic which shows the main hardware structures etc. inside the wristwatch with a GPS time correction apparatus of FIG. 1, FIG. FIG. 3 is an overall schematic diagram illustrating a main software configuration and the like of the wristwatch with a GPS time correction device in FIGS. 1 and 2. It is the schematic which shows the data in the various program storage part of FIG. It is the schematic which shows the data in the various data storage part of FIG. FIG. 5 is a schematic diagram illustrating data in various clock correction program storage units in FIG. 4. FIG. 5 is a schematic diagram showing data in various data storage units for clock correction in FIG. 4. It is a schematic flowchart which shows the main operation | movement etc. of the wristwatch with a GPS time correction apparatus which concerns on this embodiment. It is a conceptual diagram which shows an example of a response | compatibility with the temperature and frequency of an oscillator. It is a schematic explanatory drawing which shows a GPS satellite signal. It is the schematic which shows the correction image of the display time information which concerns on 1st Embodiment. It is a schematic explanatory drawing which shows the main circuit structures of the wristwatch with a GPS time correction apparatus of FIG. 1, FIG. It is the schematic which shows the main software structures etc. of the wristwatch with a GPS time correction apparatus which concern on 2nd Embodiment. It is the schematic which shows the main software structures etc. of the wristwatch with a GPS time correction apparatus which concern on 2nd Embodiment. It is a partial schematic flowchart which shows the main steps of the wristwatch with a GPS time correction device according to the second embodiment. It is the schematic which shows the correction image of the display time information which concerns on 2nd Embodiment. It is the schematic which shows the main software structures etc. of the wristwatch with a GPS time correction apparatus which concern on 3rd Embodiment. It is the schematic which shows the main software structures etc. of the wristwatch with a GPS time correction apparatus which concern on 3rd Embodiment. It is a partial schematic flowchart which shows the main steps of the wristwatch with a GPS time correction device according to the third embodiment. It is the schematic which shows the main software structures etc. of the wristwatch with a GPS time correction apparatus which concern on 4th Embodiment. It is the schematic which shows the main software structures etc. of the wristwatch with a GPS time correction apparatus which concern on 4th Embodiment. It is a partial schematic flowchart which shows the main steps of the wristwatch with a GPS time correction device according to the fourth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Wristwatch with GPS time correction device, 15 ... GPS satellite, 35 ... TCXO (crystal oscillator with temperature compensation), 38 ... Clock oscillator, 51 ... Control unit, 60 ... Various program storage units, 63 ... high-precision clock drive start program, 64 ... high-precision clock drive stop program, 66 ... satellite time information acquisition program, 67 ... display time information correction program, 70 Various data storage units, 71... Reception time data of the previous time, 72... Reception time data of the present time, 73... Reception stop data, 74. .. Various program storage units for clock correction, 81... Frequency correction amount measurement program, 82... Correction time information calculation program, 83. 84, frequency correction program, 85, frequency correction period count program, 86, constant time frequency correction program, 87, correction amount threshold judgment program, 88, threshold correction time calculation program, 89: Display time information threshold correction program, 90: Various data storage units for clock correction, 91: Setting frequency data, 92: Reception frequency data, 93: Frequency correction amount data, 94: Calculation correction time data, 95: Frequency data after correction, 96: Frequency correction period data, 97: Threshold data, 98: Correction time data upon reception, 99: Threshold correction Time amount data

Claims (10)

When receiving the radio signal including the time correction information, the driving is started based on the start information, the driving is stopped based on the stop information , and the first frequency signal is output based on the first frequency information. 1 clock oscillator,
A second clock oscillating unit that operates at all times and is used when generating time information and outputs a second frequency signal slower than the first frequency signal based on the second frequency information;
Wherein said second setting time frequency information is frequency information in the initial setting of the second clock oscillation unit, the said second frequency the first clock oscillation portion is measured on the basis of the first frequency signal output compared with information, and a frequency deviation measuring unit for measuring a frequency deviation,
The progress information from the previous reception time information which is the time information at the previous reception of the radio signal to the current time information which is the time information at the current reception of the radio signal and the frequency deviation amount A correction time generation unit for generating correction time information based on,
A time correction information acquisition unit for acquiring the time correction information from the radio signal;
Have
When the time correction information acquisition unit acquires the time correction information, a time information correction unit that corrects the time information based on the time correction information;
When the time correction information acquisition unit does not acquire the time correction information, a time information correction unit that corrects the time information with the correction time information;
A time correction apparatus comprising: A frequency correction unit that corrects the second frequency information based on the frequency deviation amount;
When the first clock oscillation unit is driven, the second frequency information is corrected low frequency information corrected by the frequency correction unit,
The time correction apparatus according to claim 1, wherein the time information is generated based on a corrected low frequency signal of the corrected low frequency information. Said second frequency signal based on the second frequency information of the second clock oscillation unit, and having a constant-time frequency correction unit that corrects every certain period of time on the basis of the frequency deviation The time adjustment apparatus according to claim 1 or 2. A second frequency correction data storage unit of the second clock oscillation unit;
2. The second frequency information of the second clock oscillation unit is corrected by rewriting data in the second frequency correction data storage unit based on the frequency deviation amount. The time correction apparatus of any one of Claim 3. The correction time information is corrected at the time of reception by comparing the correction time amount information at the time of reception, which is the correction amount of the previous time when the time information is corrected based on the time correction information, and the correction time information at this time. A threshold time determination unit that determines whether the time amount information is within the range of the threshold time information, and if the threshold time determination unit determines that the threshold time information is exceeded, the time information is The time correction apparatus according to any one of claims 1 to 4, wherein the time correction device is corrected based on the reception time correction time amount information and the threshold time information. 6. The time correction apparatus according to claim 1, wherein the first clock oscillation unit is a crystal oscillator with temperature compensation (TCXO) including a temperature correction unit. The time correction apparatus according to claim 1, wherein the start information of the first clock oscillation unit is 24 hours after the previous reception time information. The time correction apparatus according to claim 1, wherein the radio signal is a satellite signal from a position information satellite. When receiving the radio signal including the time correction information, the driving is started based on the start information, the driving is stopped based on the stop information , and the first frequency signal is output based on the first frequency information. 1 clock oscillator,
Always it operates, is used to generate the time information, and and the second clock oscillation unit for outputting a low-speed second frequency signal from the first frequency signal based on the second frequency information,
Wherein said second setting time frequency information is frequency information in the initial setting of the second clock oscillation unit, the said second frequency the first clock oscillation portion is measured on the basis of the first frequency signal output compared with information, and a frequency deviation measuring unit for measuring a frequency deviation,
The progress information from the previous reception time information which is the time information at the previous reception of the radio signal to the current time information which is the time information at the current reception of the radio signal and the frequency deviation amount A correction time generation unit for generating correction time information based on,
A time correction information acquisition unit for acquiring the time correction information from the radio signal;
Have
When the time correction information acquisition unit acquires the time correction information, a time information correction unit that corrects the time information based on the time correction information, and the time correction information acquisition unit acquires the time correction information. If not, a time information correction unit that corrects the time information based on the correction time information, and a time measuring device with a time adjustment device. When receiving the radio signal including the time correction information, the driving is started based on the start information, the driving is stopped based on the stop information , and the first frequency signal is output based on the first frequency information. 1 clock oscillator,
Always it operates, is used to generate the time information, and and the second clock oscillation unit for outputting a low-speed second frequency signal from the first frequency signal based on the second frequency information,
A time correction method for a time correction device comprising:
Wherein a setting time of frequency information is the second frequency information in the second clock oscillation unit the initial setting of the second frequency the first clock oscillation portion is measured on the basis of the second frequency signal output compared with information, and a frequency deviation measuring step of measuring the frequency deviation,
The progress information from the previous reception time information which is the time information at the previous reception of the radio signal to the current time information which is the time information at the current reception of the radio signal and the frequency deviation amount A correction time generation step of generating correction time information based on the
A time correction information acquisition step for acquiring the time correction information from the radio signal, and a time at which the time information is corrected based on the time correction information when the time correction information acquisition unit acquires the time correction information. Information correction process;
When the time correction information acquisition unit does not acquire the time correction information, a time information correction step of correcting the time information by the correction time information;
A time correction method for a time correction device, comprising:

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