JP4867669B2 - Time correction device and timing device with time correction device - Google Patents

Description

The present invention relates to a time adjustment device and a time adjustment device that perform time adjustment based on time information included in a signal transmitted from a base station in, for example, a CDMA (Code Division Multiple Access) type mobile phone communication network. attached is relates to the timing equipment.

Currently, a signal transmitted from a base station to a mobile phone in a CDMA mobile phone communication network includes time information. This time information is a GPS time based on an atomic clock of a GPS (Global Positioning System) satellite. It is time information with extremely high accuracy that matches.
Therefore, a proposal has been made in which a terminal acquires GPS time data transmitted from a base station in the CDMA mobile phone communication network, and corrects the time data of the built-in clock using the GPS time data (for example, Patent Document 1).
JP 2000-321383 A (summary etc.)

As described above, the time information of the GPS satellite is taken into the base station. When the time information is transmitted, it is performed based on the transmission timing based on the clock of each base station.
However, the timing at which the clock of each base station transmits the specific time information is slightly different depending on the setting deviation at the initial setting. For this reason, the timing at which the base station transmits the specific time information (for example, 12:00:00) is slightly different from the timing at which the GPS satellite transmits the same specific time information.
This gap is transmitted from the base station by the base station acquiring timing data for transmitting specific time information by the GPS satellite and correcting the base station to transmit the same specific time information in accordance with this timing. The time information is highly accurate information.

  However, for example, when the base station is installed in the basement, the timing at which the specific time information of the GPS satellite is transmitted from the antenna or the like cannot be acquired, and the timing shift cannot be corrected. For this reason, there has been a problem that it is difficult to correct the time accurately.

Therefore, the present invention selects a base station that transmits time information with high accuracy, and can correct the time based on the time information from the base station, and the time measuring device with the time correction device The purpose is to provide a device.

According to the present invention, the subject is a receiving unit that receives time-related information including time information transmitted from a mobile base station and base station-side time transmission timing information that is transmission timing information of the time information; A display time information correction unit for correcting the display time information of the time display unit, and an information accuracy determination unit for determining the information accuracy of the received time information and / or the base station side time transmission timing information. The display time information correction unit corrects the display time information based on the determination result of the time accuracy determination unit, and stores the base station side time transmission timing information. An information storage unit; and a time information storage unit that stores the time information in association with the base station side time transmission timing information. A base station side time transmission timing information extracting unit that extracts the most common base station side time transmission timing information from a plurality of the base station side time transmission timing information stored in the transmission timing information storage unit; The time information correction unit corrects the display time information based on the time information related to the base station side time transmission timing information extracted by the base station side time transmission timing information extraction unit. Is achieved.

According to the said structure, it has an information accuracy judgment part which judges the information accuracy of the received time information and / or base station side time transmission timing information, and a display time information correction part is based on the judgment result of a time accuracy judgment part. The display time information is corrected.
Therefore, for example, when the base station side time transmission timing information is different from the transmission timing of the GPS satellite time information, the information accuracy determination unit determines the difference in timing.
Only when it is determined that the transmission timing of the time information of the base station matches the transmission timing of the time information of the GPS satellite, the display time information correction unit corrects the display time information based on the time information.
Therefore, it is possible to prevent the time from being corrected at the wrong time timing even when the base station is largely deviated from the transmission timing of the time information of the GPS satellite as in the prior art.

According to the configuration, the information accuracy determination unit extracts the most common base station side time transmission timing information from a plurality of base station side time transmission timing information stored in the base station side time transmission timing information storage unit. A base station side time transmission timing information extraction unit is included.
Usually, for example, there are a small number of base stations arranged at a position where time information or the like cannot be obtained from an GPS satellite or the like such as underground. On the other hand, there are a large number of base stations arranged at positions where time information and the like can be acquired from GPS satellites using antennas or the like, such as the ground.
For this reason, if the most common base station side transmission timing information is extracted from the base station side time transmission timing information transmitted from a plurality of base stations as in the above configuration, the information is arranged on the ground. Information from the base station.
Since the base station arranged on the ground can receive the timing at which the time information is transmitted from the GPS satellite with an antenna or the like, the base station side time transmission timing information transmitted from the base station is GPS It is highly accurate information synchronized with the satellite timing information.
That is, according to the said structure, it becomes possible to select the information of a highly accurate base station by the base station side time transmission timing information extraction part.

Moreover, according to the said structure, a display time information correction part corrects display time information with the time information relevant to the base station side time transmission timing information extracted by the base station side time transmission timing information extraction part.
In other words, the display time information correction unit corrects the display time information based on the highly accurate time information extracted by the base station time transmission timing information extraction unit described above, so that the time can be corrected more accurately.

  Preferably, a leap second information storage unit that stores leap second information relating to the rotation of the earth included in the time information, and leap second execution timing information for correcting the display time information based on the leap second information are stored. A leap second execution time information storage unit, wherein the display time information correction unit is input by the time information including the leap second information, the leap second execution time information, and the display time information change unit. The time correction apparatus is characterized in that the display time information is corrected based on information.

According to the said structure, a display time information correction part corrects display time information based on the time information containing leap second information, leap second execution time information, and the information input in the display time information change part.
For this reason, even if the time correction device acquires leap second information that has been changed before it is actually applied, the leap second information is immediately applied and the display time information is not corrected. The leap second information is applied after waiting until the time, and the display time information is corrected.
In addition, even if the time adjustment device acquires the changed leap second information, if the change cannot be recognized, the change of the leap second information can be recognized by the operation of the display time information change unit of the user. Therefore, also in this case, the changed leap second information can be applied after waiting until the time of implementation.

  Preferably, there is a time difference information storage unit for storing time difference information and / or daylight saving time information included in the time information, and the display time information correction unit is configured to display the display time based on the time difference information and / or summer time information. The time correction apparatus is characterized by being configured to correct information.

According to the said structure, the display time information correction part becomes a structure which corrects the said display time information based on time difference information and / or summer time information.
That is, for example, when the user of the time adjustment device moves to an area where the time difference changes due to travel or the like, the time information is acquired from the base station in the area after the movement and the time is adjusted. However, depending on the area, the reliability of the time information transmitted from the base station may be low.
In this case, the time is not adjusted based on the time information of the base station, but only the time difference is corrected based on only the time difference information, and the time is corrected. It is possible to prevent the occurrence of a crazy situation.

  Further, by correcting the time difference and the daylight saving time based only on the time difference information and the daylight saving time information among the time information of the base station, it is possible to make a time correction considering the summer time.

According to the present invention, the subject receives time related information including the time information transmitted from the mobile base station and the base station side time transmission timing information which is transmission timing information of the time information. An information accuracy for determining the information accuracy of the received time information and / or the base station side time transmission timing information, including a reception unit and a display time information correction unit that corrects the display time information of the time display unit A base station having a determination unit, wherein the display time information correction unit corrects the display time information based on a determination result of the time accuracy determination unit, and stores the base station side time transmission timing information A side time transmission timing information storage unit, and a time information storage unit that stores the time information in association with the base station side time transmission timing information, the information accuracy determination unit, A base station side time transmission timing information extracting unit for extracting the most common base station side time transmission timing information from a plurality of the base station side time transmission timing information stored in the base station side time transmission timing information storage unit; a, wherein the display time information adjustment unit that you modify the display time information by the time information associated with the base station time transmission timing information extracted by said base station side time transmission timing information extracting section This is achieved by the time measuring device with the time correction device.

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 illustrating a timepiece with a time adjustment device according to the present invention, for example, a wristwatch 10 with a time adjustment device according to the first embodiment (hereinafter referred to as a “watch”), and FIG. 1 is a schematic diagram showing a main hardware configuration and the like inside one wristwatch 10. FIG.
As shown in FIG. 1, a wristwatch 10 has a dial 12, a long hand, a short hand 13 and the like disposed on the surface of the wristwatch 10 and a display 14 formed of LEDs and the like for displaying various messages. The display 14 may be an LCD, an analog display or the like in addition to the LED.

As shown in FIG. 1, the wristwatch 10 has an antenna 11, and this antenna 11 is configured to receive signals from CDMA base stations 15a, 15b and the like. That is, the CDMA base station 15a and the like are base stations for a CDMA mobile phone communication network.
However, the wristwatch 10 according to the present embodiment does not perform telephone communication with the CDMA base station 15a and the like because it does not have a mobile phone function, but receives time information from a signal transmitted from the CDMA base station 15a and the like. However, it is intended to correct the time based on the signal. The contents of the signal transmitted from the CDMA base station 15a will be described later.
As shown in FIG. 1, the wristwatch 10 has a crown 28 that can be operated by the user.
The crown 28 is an example of a display time information changing unit that can be operated by the user of the wristwatch 10.

First, the hardware configuration of the wristwatch 10 of FIG. 1 will be described. As shown in FIG. 2, the wristwatch 10 includes a bus 20, and a CPU (Central Processing Unit) 21, a RAM (Random Access Memory) 22, a ROM (Read Only Memory) 23, and the like are connected to the bus 20.
Further, for example, a CDMA base station radio wave receiver 24 that is a receiving unit that receives a signal transmitted from the CDMA base station 15 a or the like is connected to the bus 20. The CDMA base station radio wave receiver 24 has the antenna 11 of FIG.
Also connected to the bus 20 are a real time clock (RTC) 25 composed of an IC (semiconductor integrated circuit) or the like as a clock mechanism, a crystal oscillation circuit (TCXO) 26 with a temperature compensation circuit, and the like.
That is, the RTC 25 is configured to generate time information at the clock timing generated by the TCXO 26.
This clock timing is an example of the time display unit side transmission timing information, and the TCXO 26 is an example of the time display unit side transmission timing information generation unit.

  1 is an example of a time display unit that displays display time information.

  Further, the display 14 crown 28 of FIG. 1 is connected to the bus 20. As described above, the bus 20 is an internal bus having a function of connecting all devices and having an address and a data path. The RAM 22 processes a predetermined program and controls the ROM 23 and the like connected to the bus 20. The ROM 23 stores various programs and various information.

3 to 6 are schematic diagrams showing main software configurations and the like of the wristwatch 10, and FIG. 3 is a schematic overall view showing configurations of main software configurations and the like of the wristwatch 10.
As shown in FIG. 3, the wristwatch 10 has a control unit 29, and the control unit 29 includes various programs in the various program storage units 30 shown in FIG. 3, various data in the first various data storage unit 40, and The second data storage unit 50 is configured to process various data.
In FIG. 3, the various program storage unit 30, the first various data storage unit 40, and the second various data storage unit 50 are shown separately, but actually the data is stored separately in this way. However, they are shown separately for convenience of explanation.
Note that the first various data storage unit 40 in FIG. 3 mainly shows data stored in advance. Further, the second various data storage unit 50 mainly shows data after the data in the first various data storage unit 40 is processed by the programs in the various program storage units 30.
4 is a schematic diagram showing data in the various program storage units 30 of FIG. 3, and FIG. 5 is a schematic diagram showing data in the first various data storage units 40 of FIG. FIG. 6 is a schematic diagram showing data in the second various data storage unit 50 of FIG.
7 to 9 are schematic flowcharts showing main operations and the like of the wristwatch 10 according to the first embodiment. Specifically, FIG. 7 is a schematic flowchart showing a time correction process immediately after the wristwatch 10 is turned on and the like, and FIGS. 8 and 9 are time correction processes in normal use of the wristwatch 10. It is a schematic flowchart which shows.

First, before entering the description of the flowcharts and the like of the respective embodiments, a portion related to the present embodiment in the CDMA mobile phone system will be described.
The CDMA mobile phone system has been in full operation since the system developed by Qualcomm Corp. in the United States was adopted in 1993 as one of the US standard systems "IS95". Since then, IS95A and IS95B , Through the revision of CDMA2000. In Japan, a mobile phone system is operated according to ARIB STD-T53.
In such a CDMA system, since the downlink (from the CDMA base station 15a or the like to the mobile station, in this embodiment, the wristwatch 10) is synchronous communication, the wristwatch 10 needs to synchronize with time data of the CDMA base station 15a or the like. A radio wave signal (hereinafter also simply referred to as “signal”) that is a CDMA base station signal transmitted from the CDMA base station 15a or the like specifically includes a pilot channel signal and a sync channel signal. The pilot channel signal is a signal transmitted at a different timing for each CDMA base station 15a and the like, for example, a pilot PN signal.

Specifically, this difference in timing appears as a difference in pilot PN signals transmitted from the CDMA base station 15a and the like. That is, for example, the CDMA base station 15b transmits a signal at a timing slightly delayed from the CDMA base station 15a. For example, the pilot PN offset is provided for 128 chips (0.104 ms (milliseconds)).
Even if there are a large number of CDMA base stations 15a and the like in this way, each CDMA base station 15a and the like provide a different pilot PN offset by an integer multiple of 64 chips (64 chips × 2 in the present embodiment). The wristwatch 10 that receives the signal is configured so that it can easily grasp which CDMA base station 15a or the like has received the signal.

Further, the signal transmitted from the CDMA base station 15a and the like includes a sync channel signal, which is the sync channel message of FIG. FIG. 10 is a schematic diagram showing the contents of the sync channel message.
As shown in FIG. 10, the sync channel message includes data indicating that the pilot PN signal data, for example, pilot PN offset data is 64 chips (0.052 ms) × N (0 to 512) (this embodiment). In this form, 128 chips (0.104 ms)) are included. This data is represented by “PILOT_PN” in FIG.
The sync channel message also includes system time data which is GPS time data.
The system time is an integrated time in units of 80 ms from midnight on January 6, 1980. This data is represented by “SYS_TIME” in FIG. This data is represented by “SYS_TIME” in FIG.

In addition, the sync channel message includes data of “leap“ デ ー タ ”seconds” for conversion to world coordinated time (UTC). This data is represented by “LP_SEC” in FIG. Here, for example, the data is “13” seconds or “14” seconds. That is, “leap second” is an example of leap second information relating to the rotation of the earth included in the time information.
The sync channel message also includes a local offset time, which is time difference data for UTC in the country or region where the clock 10 is located. That is, for example, in the case of Japan, data indicating that the time is 9 hours plus UTC is stored. This data is represented by “LTM_OFF” in FIG.

  The sync channel message also includes summer time data indicating whether or not the country or region where the clock 10 is located adopts summer time or the like. In Japan, since the daylight saving time system is not adopted, the data is “0”. This data is represented by “DAYLT” in FIG.

The wristwatch 10 of the present embodiment receives the sync channel message shown in FIG. 10 described above from the CDMA base station 15a, etc., and corrects the time, but uses the time information from the CDMA base station 15a as it is. If the time is corrected, an error occurs, and the time of the wristwatch 10 may not be corrected accurately.
Therefore, the error is corrected in the flowcharts of FIGS. 7 to 10 to correct the time. As a premise, the reason why the time information transmitted from the CDMA base station 15a and the like has an error will be described.

FIG. 11 is a schematic explanatory diagram specifically showing a state in which an error occurs in time information transmitted from the CDMA base station 15a and the like.
As shown in the data section of FIG. 11, for example, “second carry timing”, “time interval”, “SYS_TIME”, “leap second correction value” are data relating to time information transmitted from the CDMA base station 15a or the like. , “Local offset” and “summer time”.
Among these, since “SYS_TIME”, “leap second correction value”, “local offset”, and “summer time” have already been described, “second carry timing” and “time interval” will be described below.
The system time (SYS_TIME) transmitted by the CDMA base station 15a or the like is GPS time data. Information such as a sync channel message including this system time is transmitted according to the transmission timing of each CDMA base station 15a or the like.
Then, the wristwatch 10 that receives information such as a sync channel message corrects the system time in accordance with the transmission timing of the base station.
If the transmission timing of each CDMA base station 15a and the like is exactly the same as the transmission timing of the GPS satellite time information, there is no problem, but in reality, the transmission timing setting of each CDMA base station 15a is Since the operation is performed manually by an operator or the like, there are many cases in which a deviation of about 0.5 seconds occurs although there is no deviation until 1 second. Therefore, the time is corrected through a process as described later.

On the other hand, the transmission timing of the base station that transmits from each CDMA base station 15a, etc. includes information on the transmission timing in units of seconds, and this becomes the data of the second carry timing in FIG.
That is, data in units of second of the system time of each CDMA base station 15a and the like is transmitted from the CDMA base station 15a and the like in accordance with the data of the second carry timing.
Therefore, the wristwatch 10 that receives a signal from the CDMA base station 15a or the like can set the same time as the CDMA base station 15a or the like by matching the second data of the system time with the data of the second carry timing. .
Thus, the second carry timing of the CDMA base station 15a and the like is an example of base station side time transmission timing information.

Note that, as described above, the CDMA base station 15a or the like initially acquires the second carry timing data from a GPS satellite or the like afterwards, even if the second carry timing is manually performed. The raising timing can be highly accurate timing data matched with a GPS satellite or the like.
However, this is a case where the CDMA base station 15a or the like is placed on the ground or the like, and when the CDMA base station 15a or the like is placed on the ground or the like, a highly accurate second carry is performed from a GPS satellite or the like by an antenna or the like. There are many cases where timing data cannot be acquired.
That is, the CDMA base station 15a or the like arranged in the basement or the like has a high possibility of maintaining the error of the second carry timing at the time of setting, for example, 0.5 seconds as it is.
This case is CASE 3 in FIG.

Further, the “time interval” in the data section of FIG. 11 is data having a length of 1 second, and the time interval does not cause an error because the clock of each CDMA base station 15a and the like is accurate. .
On the other hand, the RTC 25 and the TCXO 26 of the wristwatch 10 shown in FIG. 3 may start to slightly deviate depending on the temperature or the like, and thus the “time interval” is not constant in the wristwatch 10.

In addition, the “leap second correction value” of the data classification in FIG. 11 is set manually, but it is virtually impossible to set the set time in accordance with the application time of the “leap second correction value”. Is possible. For this reason, the “leap second correction value” is manually corrected from 13 seconds to 14 seconds before midnight, for example, July 1 or January 1, which is the actual application time, for example, three months ago. Will be.
Then, an error of 1 second is generated from the time when this correction is performed until the application time of the next “leap second correction value”. For this reason, as will be described later, correction is made when the time is corrected.

Based on the above description, CASE 1 to CASE 3 in FIG. 11 will be described in order. CASE 1 in FIG. 11 indicates a case where the CDMA base station 15a or the like is installed on the ground or the like and is in an environment where data can be received from a GPS satellite or the like via an antenna or the like, that is, a normal time state.
Specifically, the second carry timing is also highly accurate timing data that matches the second carry timing of a GPS satellite or the like.
In addition, since the leap second correction value is also before manual correction, the leap second data is also highly accurate data.
In addition, the local offset and daylight saving time are set correctly.
That is, when the wristwatch 10 receives the second carry timing and time information from a CDMA base station such as CASE 1 and corrects the time based on the time information, the time can be accurately adjusted. It becomes.

Next, the case of CASE2 will be described. In the case of CASE2, the leap second correction value is manually changed in the state of the CDMA base station of CASE1. For example, it is a case where it is changed from 13 seconds to 14 seconds.
In this case, as described above, there are many cases where, for example, about three months before the actual application time is changed, in this case, after the change, the actual application time (for example, January 1st midnight) An error of 1 second has occurred.

  Next, CASE 3 will be described. In CASE3, since the CDMA base station is installed, for example, underground, the second carry timing is different from the second carry timing such as a GPS satellite by about 0.5 seconds, for example. Further, not only the difference in the second carry timing but also the case where the leap second is changed as described above is included.

  In the present embodiment, on the wristwatch 10 side, the CDMA base station 15a or the like receives a signal in a state where it does not know which CASE corresponds to FIG. In this case, it is determined whether or not this is the case, and the time is corrected by correcting the data based on the determination result.

Hereinafter, the operations and the like of the wristwatch 10 according to the present embodiment will be described according to the flowcharts of FIGS. 7 to 9, and various programs and various data of FIGS.
FIG. 7 is a schematic flowchart showing start-up processing. That is, when the wristwatch 10 has been turned off so far, the time is adjusted when the power is turned on for the first time. In other words, it is a cold start state.
First, as shown in ST1 of FIG. 7, the wristwatch 10 performs a pilot channel scan in order to receive a pilot channel signal radio wave among radio waves transmitted from the CDMA base station 15a and the like. Specifically, the pilot channel reception program 31 of FIG. 4 operates and performs a pilot channel scan.

Next, proceeding to ST2, it is determined whether a pilot channel signal has been received from the nearest CDMA base station 15a or the like. When the pilot channel signal cannot be received from the nearest CDMA base station 15a or the like, the process proceeds to ST3 and the manual time setting is displayed.
That is, the manual time setting screen display program 32 shown in FIG. 4 operates to display the manual time setting screen data 41a shown in FIG. 5 on the display 14 shown in FIG.
Therefore, the user of the wristwatch 10 can input an accurate time by operating the crown 28 or the like, and the RTC 25 and TCXO 26 in FIG. It can be displayed.
As described above, when the wristwatch 10 is turned on, the wristwatch 10 is corrected to an accurate time even if the time information for correcting the time is not acquired from the CDMA base station 15a or the like.
That is, the crown 28 is an example of a display time information changing unit for changing the display time information of the time display unit such as the dial 12 by an external input. The display time information on the dial 12 and the like is corrected based on information input from the crown 28 and the like.

On the other hand, when the pilot channel signal can be received in ST2, the process proceeds to ST4. In ST4, the sync channel is switched to and the sync channel message shown in FIG. 10 is received.
Specifically, the sync channel message reception program 33 in FIG. 4 operates to receive the sync channel message transmitted from the CDMA base station 15a and store it in the sync channel message data storage unit 51 in FIG.
Next, the process proceeds to ST5. In ST5, the time is corrected based on the received sync channel message and displayed.
Specifically, the time correction program 34 in FIG. 4 operates to generate highly accurate time information based on the system time (SYS_TIME) of the sync channel message data 51a in FIG. 6, and the RTC 25 in FIG. Correct the display time information to be displayed.

Next, the process proceeds to ST6. In ST6, in ST5, it is determined whether or not the user (user) has corrected the display time information shown on the dial 12 of FIG. More specifically, the user time correction execution determination program 35 in FIG.
That is, in ST6, if the user does not correct the display time information, it is assumed that it is correct time information, and the start-up process ends. This case corresponds to CASE 1 in FIG.
The user time correction execution / non-execution determination program 35 is an example of an information accuracy determination unit. This program is based on information input from a display time information change unit (for example, the crown 28). For example, the display time information on the dial 12 or the like is corrected.
On the other hand, if the user corrects the display time information in ST6, the display time information on the dial 12 and the like is in error, so the process does not end and proceeds to ST7.

In ST7, it is determined whether or not the time corrected by the user is within one second. That is, as shown in FIG. 11 and FIG. 10, there is leap second data in the sync channel message transmitted from the CDMA base station 15a or the like. It may change, and the change is typically 1 second.
Therefore, in ST7, when the user corrects the display time information for 1 second, it is considered that the time not yet applied is corrected to the current correct time.
That is, this case corresponds to CASE 2 in FIG. In ST7, if the correction is within 1 second, the process ends as it is.

On the other hand, if the time corrected by the user is not within 1 second in ST7, the time information from the current CDMA base station 15a and the like is determined to be unreliable because it has been corrected for several seconds. The setting is displayed, and the user corrects the dial 12 and the like.
That is, this case corresponds to CASE 3 in FIG.

  In this way, the startup process ends. That is, in the present embodiment, in the start-up process, the reliability of time information transmitted from the CDMA base station 15a or the like is determined, and a highly accurate CDMA base station 15a or the like is selected, and the CDMA base station 15a or the like The time is adjusted based on the time information from.

In this way, when the startup process of the wristwatch 10 is completed, the process proceeds to the normal process. 8 and 9 are schematic flowcharts showing normal processing.
First, steps ST11 to ST13 in FIG. 8 are performed. Since these ST11 to ST13 are the same as ST1, ST2 and ST4 in FIG. 7, their description is omitted.
In ST14 and subsequent steps, as in ST5 in FIG. 7, the time is not immediately adjusted based on the sync channel message received from the CDMA base station 15a or the like.
This point will be described with reference to FIG. 12 before explaining the flowchart.
FIG. 12 is a schematic explanatory diagram showing the transmission timing of signals from the CDMA base station 15a and the like and the RTC 25 of the wristwatch 10 and the like, particularly the transmission timing of time information (second carry timing).

Moreover, in FIG. 12, a shows the time interval of FIG. 11, for example, shows an interval of 1 second. That is, in the CDMA base station (ground) in FIG. 12, a signal is transmitted while accurately maintaining an interval of 1 second.
The transmission timing of this signal matches the second carry timing which is the transmission timing of the GPS satellite or the like received via an antenna or the like. In other words, this is the most accurate situation.
This corresponds to the above-described CASE 1 in FIG.
Next, in the CDMA base station (underground) of FIG. 12, the second carry timing of the signal is shifted by b (for example, 0.5 seconds). As described above, since the second carry timing is set manually at the time of setting, the initial error b is maintained as it is, which is the case of CASE 3 in FIG.
That is, since this CDMA base station is in the basement, the second carry timing of the GPS satellite or the like cannot be received by the antenna or the like and cannot be corrected.
Further, the solid line portion of the RTC in FIG. 12 indicates the second carry timing of the RTC 25 of the wristwatch 10. The second carry timing of the RTC 25 shown in FIG. 12 is based on the timing generated by the oscillation circuit generated by the TCXO 26 of FIG. However, the TCXO 26 may have an error due to temperature or the like, and the error is shown in the RTC second carry timing of FIG.

In the present embodiment, it is initially unknown whether the CDMA base station 15a or the like of the signal received by the wristwatch 10 is the CDMA base station (ground) or CDMA (underground) in FIG. It has become.
Further, the second carry timing of the RTC 25 of the wristwatch 10 is highly likely to have an error.
Therefore, the second carry timing data as shown in FIG. 12 is acquired from a plurality of, for example, three CDMA base stations 15a, and if a large number of them, for example, two second carry timing data match, It is determined that the CDMA base station 15a or the like that is transmitting the second carry timing is installed on the ground.
This determination is based on the fact that there are a small number of underground CDMA base stations installed and that users often move from the underground to the ground.

Then, until the second carry timing data of the plurality of CDMA base stations 15a and the like is acquired as described above, the time adjustment of the wristwatch 10 is not performed as in ST5 of FIG. Instead, the second carry timing of the RTC 25 of the wristwatch 10 is matched with the second carry timing from the received CDMA base station 15a or the like.
That is, as shown in FIG. 12, the length of 1 second (time interval in FIG. 11) acquired at the second carry timing of the signal from the CDMA base station 15a or the like is that the CDMA base station 15a or the like is on the ground. Or the same length regardless of whether it is underground.
On the other hand, the RTC 25 reflects the error of the TCXO 26, and an error occurs in the length of 1 second.
Therefore, in this embodiment, first, until the second carry timing data from the plurality of CDMA base stations 15a and the like is acquired, the second carry timing data of the signal from the CDMA base station 15a and the like is added to the second of the RTC 25 seconds. Correct the carry timing. Thereby, as shown by the broken line portion of the RTC (lower side) in FIG. 12, the 1-second interval (time interval) of the RTC 25 can be corrected. In the case of FIG. 12, correction is made as indicated by c, d, and e.

In the case of FIG. 12, since an interval of 1 second is set to the CDMA base station 15a and the like arranged in the basement, an error of b (for example, 0.5 seconds) still occurs as time information.
However, by correcting the second carry timing of the RTC 25 in this way, the error is fixed to a range of b, for example, 0.5 seconds, and the time of the wristwatch 10 is prevented from being greatly deviated. Can do.
Further, this error is not so long because the wristwatch 10 eliminates the above as described above by acquiring the second carry timing data from a plurality of, for example, three CDMA base stations 15a.
That is, finally, the wristwatch 10 discriminates signals from the CDMA base station 15a and the like installed on the ground in FIG. 12, and uses the second carry timing and time information transmitted from the CDMA base station 15a and the like. Based on this, the time is corrected as shown in ST5 of FIG. 7, so that the time of the dial 12 or the like can be set to a highly accurate time.

The above point will be specifically described below in ST14 and subsequent steps in FIG. In ST14, the system time (SYS_TIME) of the sync channel message data 51a in FIG. 6 and the second carry timing data (CDMA base station second carry timing data) in the signal transmitted from the CDMA base station 15a and the like corresponding thereto are used. Acquire (an example of the base station side time transmission timing information storage step and the time information storage step).
That is, as shown in FIG. 6, the CDMA base station second carry timing data 52a is stored in the CDMA base station second carry timing data storage unit 52 (ST15).

Thus, the CDMA base station second carry timing data 52a is an example of base station side transmission timing information which is transmission timing information transmitted from the mobile base station, and a sync channel message transmitted from the CDMA base station 15a or the like. In addition to the time information such as, it is an example of time related information.
The CDMA base station second carry timing data storage unit 52 is an example of a base station side time transmission timing information storage unit.
Further, the sync channel message data 51a is stored in association with the CDMA base station second carry timing data 52a of the CDMA base station 15a that is the transmission source. Therefore, the sync channel message data storage unit 51 is an example of a time information storage unit that stores time information in association with the base station side time transmission timing information.

In ST14, the RTC second carry timing data storage unit 53 in FIG. 6 stores the second carry timing data 53a of the RTC 25 in FIG.
Since the RTC 25 generates display time information based on the second carry timing data 53a, the second carry timing data 53a is an example of time display unit transmission timing information serving as a reference for the display time information. Yes.

Next, the process proceeds to ST16. In ST16, it is determined whether or not the CDMA base station second carry timing data 52a matches the RTC second carry timing data 53a.
Specifically, the second carry timing comparison program 36 of FIG. 4 operates to compare the CDMA base station second carry timing data 52a and the RTC second carry timing data 53a of FIG.

If they do not match in ST16, the process proceeds to ST17, where RTC second carry timing data 53a is matched with CDMA second carry timing data 52a (an example of a transmission timing information correction step).
This process corresponds to matching the RTC second carry timing of FIG. 12 described above with the second carry timing of the CDMA base station (underground) of FIG.
Specifically, the second carry timing correction program 37 of FIG. 4 operates to correct the RTC 25 and the like.
Thus, the second carry timing correction program 37 is an example of a transmission timing information correction unit.

Next, the process proceeds to ST18. In ST18, it is determined whether or not three or more CDMA base station carry timing data 52a received by the wristwatch 10 are stored.
That is, as described above, in view of the fact that there are few CDMA base stations 15a and the like installed in the basement and many CDMA base stations 15a and the like installed on the ground, they are installed on the ground with higher time accuracy. This is a process for selecting a signal from the CDMA base station 15a.
Specifically, the CDMA base station second carry timing data count program 38 in FIG. 4 operates, and the CDMA base station second carry timing data 52a in the CDMA base station second carry timing data storage unit 52 in FIG. 6 is referred to. Then, it is determined whether or not three or more are stored.

Then, the process proceeds to ST19, where the most CDMA base station carry timing data 52a is selected, and the sync channel message data 51a associated with this CDMA base station carry timing data 52a is selected (base station side time transmission timing). An example of an information extraction process).
That is, as described with reference to FIG. 12, since the number of CDMA base stations 15a and the like installed on the ground is the largest, and the user moves from the ground to the ground, the most CDMA base station carry timing data. There is a high possibility that 52a becomes transmission data of the CDMA base station 15a or the like installed on the ground. The CDMA base station second carry timing data 52a such as the CDMA base station 15a installed on the ground is highly accurate data that matches the second carry timing of a GPS satellite or the like.
In ST19, specifically, the CDMA base station second carry timing selection program 39 of FIG. 4 operates, and corresponds to the highly accurate CDMA base station second carry timing data 52a that matches the second carry timing of a GPS satellite or the like. In other words, the CDMA base station second carry timing data count program 38 and the CDMA base station second carry timing selection program 39 are selected by the base station side time transmission timing information collecting unit. It is an example.

Through the above steps, it is possible to select transmission data of the CDMA base station 15a and the like installed on the ground shown in FIG.
However, as described above, even such data has a problem of leap second data. In other words, the leap second data may be changed on the data of the CDMA base station 15a or the like, for example, three months before being actually applied. Therefore, the process is performed after ST20.
First, in ST20, data such as system time (SYS_TIME) and leap “閏” seconds (LP_SEC) (see FIG. 10), for example “14” seconds, is acquired from the sync channel message data 51a selected in ST19. (At the time of global agreement)
This is the year, month, day, hour, minute, and second at the time of global agreement, that is, Greenwich Mean Time.
That is, the sync channel message data storage unit 51 in FIG. 6 is an example of a leap second information storage unit. Further, ST20 is specifically executed by the UTC time calculation program 301 of FIG.

Next, in ST21, it is determined whether the leap second data received this time is different from the already registered leap second data.
That is, as shown in FIG. 6, the second various data recording unit 50 receives the registered reception which is “leap second” data of the sync channel message (see FIG. 10) received from the CDMA base station 15a or the like in the past. An already registered received leap second data storage unit 54 for storing leap second data 54a is provided.
Therefore, the “leap second” data of the sync channel message received in ST13 described above is compared with the already-received received leap second data 54a to determine whether the data is different.

That is, for example, if the already received leap second data 54a received on August 20 is “13 seconds” and the current leap second data received on August 30, for example, is “14 seconds”, the existing leap second data 54a is “14 seconds”. The registered reception leap second data 54a and the current reception leap second data are different.
In this case, “14 seconds” is, for example, “leap second” data scheduled to be implemented from midnight on January 1 of next year.

  As described above, when it is determined in ST21 that the data of “leap second” is different, the “leap second” data received this time has been changed and is data for next year or the like. The process proceeds to ST22 in order to determine whether to apply the data.

In ST22, it is determined whether or not the UTC time data is 23:59:59 on June 30 or December 31.
That is, it is determined whether or not the time when the leap second data received in ST13 is actually applied (implemented) has arrived.
Specifically, the leap second application determination program 302 makes a determination based on the current UTC time data and the leap application time data 42a of FIG. In the leap second application time data 42a, for example, data such as 23:59:59 on June 30 or December 31 is stored as determination time data.
As described above, the leap second application time data storage unit 42 in FIG. 5 is an example of a leap second execution time information storage unit.

Next, if the UTC time data of this time corresponds to the applicable time in ST22, the leap second data (for example, “14 seconds”) received this time is registered as the already registered leap second data 54a (ST23). Proceed to ST24.
In ST24, the time is corrected and displayed based on the leap second received this time.
That is, the time correction program 34 of FIG. 4 operates, and the RTC 25 of FIG. 3 is corrected based on the sync channel message data 51a, the second carry timing data, etc., and the display time information such as the dial 12 of FIG. 1 is corrected. To do.
Thus, the time correction program 34 is an example of a display time information correction unit.

On the other hand, if “NO” in ST22, that is, if the UTC time data of this time is not the predetermined time of June 30 or December 31, the leap second data received this time has been changed. It will not be “leap second” data applied at the current time.
In this case, if the time is corrected immediately using the leap second data received this time, the time is delayed by “1 second” in the case of the above example by the amount that “leap second” is changed, Accurate time correction cannot be performed.
In this regard, in this embodiment, if “NO” in ST22, the process proceeds to ST25. In ST25, the time correction program 34 is configured to correct the RTC 25 based on the already received leap second data 54a in FIG.
For this reason, since “leap second” data that matches the time when the application should be applied is used, it is possible to prevent the occurrence of an error in time by, for example, “1 second” as in the prior art. ing.

On the other hand, if the leap second data received this time is not different from the already registered leap second data 54a in ST21, that is, if it is the same, the process proceeds to ST26.
For example, there is a case where the leap second data 54a that has already been received has been received one month ago, and the leap second data has been changed by the CDMA base station 15a or the like, for example.
In this case, if the application time of the leap second data after the change is in the future, an error occurs in the time correction as a result.
Therefore, in the present embodiment, the process proceeds to ST26 and ST27. In ST26 and ST27, since the display time information corrected in ST24 is displayed on the wristwatch 10, when the user who sees it corrects the time by 1 second, it is determined that the leap second has been corrected and is determined at that time. Let That is, the leap second error can be corrected by the user's judgment.

  As described above, in the present embodiment, it is possible to determine whether the case is CASE 1 to CASE 3 in FIG. 11 and correct the time based on the optimal transmission data of the CDMA base station 15a or the like. Regardless of the situation where the wristwatch 10 is placed, it is always possible to correct the time with high accuracy.

(Second Embodiment)
FIG. 13 is a schematic flowchart showing main operations and the like of the wristwatch with a time adjustment device “hereinafter referred to as“ watch ”” according to the second embodiment of the present invention. Since many of the configurations of the wristwatch according to the present embodiment are the same as the configuration of the first embodiment described above, the description of the common configurations etc. is omitted with the same reference numerals, and the differences are described below. The explanation will be centered.
This embodiment corresponds to the CDMA base station 15a and the like in the case corresponding to CASE 3 in FIG. That is, in CASE 3, the management of the CDMA base station 15a by the installation entity that installs the CDMA base station 15a is bad, and the management of the system time itself is bad.
In this case, if the time is adjusted based on time information such as a sync channel message of the CDMA base station 15a or the like, a time error may occur due to the correction.
However, as shown in FIG. 11, the local offset data and the summer time data are correct even in such a CDMA base station 15a. Therefore, if the management of the local CDMA base station 15a, etc. is poor due to movement to overseas, etc., we will dare to correct only the time difference and daylight saving time only from the local offset data and daylight saving time data without performing all the time adjustments. To do.
By doing in this way, it becomes a wristwatch capable of maintaining highly accurate time information even in an area where the management of the CDMA base station 15a or the like is poor.

Specifically, the process is as shown in FIG. ST21 to ST23 in FIG. 13 are the same as ST11 to ST13 in FIG. 6 described above, and the difference is ST24.
In ST24, local offset data, that is, time difference data from UTC and daylight saving time presence / absence data are acquired from the acquired sync channel message (see FIG. 10), and only such data is corrected.
In this way, it is possible to correct the time with high accuracy by correcting.

  The present invention is not limited to the above-described embodiment.

It is the schematic which shows the wristwatch with a time adjustment apparatus concerning 1st Embodiment. It is the schematic which shows the main hardware constitutions etc. inside the wristwatch of FIG. It is a schematic whole figure showing composition, such as main software composition of a wristwatch. 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 1st various data storage part of FIG. It is the schematic which shows the data in the 2nd various data storage part of FIG. It is a schematic flowchart which shows processes, such as time correction immediately after turning on the power supply of a wristwatch. It is a schematic flowchart which shows processes, such as time correction in normal use of a wristwatch. It is another schematic flowchart which shows processes, such as time correction in the normal use of a wristwatch. It is the schematic which shows the content of a sync channel message. It is the schematic explanatory drawing which showed concretely the state which an error produces in the time information which a CDMA base station etc. transmit. It is a schematic explanatory diagram showing the transmission timing of signals such as a CDMA base station and the RTC of a wristwatch, especially the transmission timing of time information (second carry timing). It is a schematic flowchart which shows the main operation | movement etc. of the wristwatch with a time adjustment apparatus concerning the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Wristwatch with time correction device, 12 ... Dial, 14 ... Display, 15a and 15b ... CDMA base station, 24 ... CDMA base station radio receiver, 25 ... Real time clock (RTC), 26... Crystal transmission circuit with temperature compensation circuit (TCXO), 28... Crown, 31... Pilot channel reception program, 32. Sync channel message reception program, 34... Time correction program, 35... User time correction execution presence / absence determination program, 36... Second carry timing comparison program, 37. ..CDMA base station second carry timing data count program, 39 ... CDMA base station second carry Imming selection program, 41a, manual time setting screen data, 42a, leap application time data, 51a, sync channel message data, 52a, CDMA base station second carry timing data, 53a, second Carry timing data, 54a ... Registered leap second data, 301 ... UTC time calculation program, 302 ... Leap second application determination program

Claims (4)

A receiving unit that receives time-related information including time information transmitted from the mobile base station and base station-side time transmission timing information that is transmission timing information of the time information;
A display time information correction unit for correcting the display time information of the time display unit,
An information accuracy determination unit that determines information accuracy of the received time information and / or the base station side time transmission timing information, and the display time information correction unit is based on a determination result of the time accuracy determination unit; It is configured to correct the display time information ,
A base station side time transmission timing information storage unit for storing the base station side time transmission timing information;
A time information storage unit that stores the time information in association with the base station side time transmission timing information,
The base station side from which the information accuracy judgment unit extracts the most common base station side time transmission timing information from the plurality of base station side time transmission timing information stored in the base station side time transmission timing information storage unit It has a time transmission timing information extraction unit,
The display time information adjustment unit is characterized that you modify the display time information by the time information associated with the base station time transmission timing information extracted by said base station side time transmission timing information extracting section Time correction device. A leap second information storage unit for storing leap second information related to rotation of the earth included in the time information;
A leap second execution time information storage unit for storing leap second execution time information for correcting the display time information based on the leap second information,
The display time information correction unit corrects the display time information based on the time information including the leap second information, the leap second execution timing information, and information input by the display time information change unit. The time correction apparatus according to claim 1 . A time difference information storage unit for storing time difference information and / or daylight saving time information included in the time information;
The time adjustment apparatus according to claim 1, wherein the display time information correction unit is configured to correct the display time information based on the time difference information and / or summer time information. A receiver for receiving time-related information including the time information transmitted from the mobile base station and the base station side time transmission timing information which is transmission timing information of the time information;
A display time information correction unit for correcting the display time information of the time display unit,
An information accuracy determination unit that determines information accuracy of the received time information and / or the base station side time transmission timing information, and the display time information correction unit is based on a determination result of the time accuracy determination unit; It is configured to correct the display time information ,
A base station side time transmission timing information storage unit for storing the base station side time transmission timing information;
A time information storage unit that stores the time information in association with the base station side time transmission timing information,
The base station side from which the information accuracy judgment unit extracts the most common base station side time transmission timing information from the plurality of base station side time transmission timing information stored in the base station side time transmission timing information storage unit It has a time transmission timing information extraction unit,
The display time information adjustment unit is characterized that you modify the display time information by the time information associated with the base station time transmission timing information extracted by said base station side time transmission timing information extracting section Timekeeping device with time correction device.

Images