JP5333014B2 - Electronic device and leap second update information receiving method of electronic device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic device and a leap second updation information reception method, capable of reducing power consumption by acquiring efficiently leap second information, and displaying an accurate time. <P>SOLUTION: A wrist watch with GPS includes a satellite signal reception part 10A, a clocking means, a reception environment determination means 211, an acquisition period determination means 212, a reception control means 213 and a time information correction part 220. The reception control means 213 receives leap second updation information when an acquisition period of leap second updation information comes with an excellent reception environment. The time information correction part 220 updates a time based on the leap second information, when a date and time clocked by the clocking means reaches an updation date and time of the leap second updation information received by the reception control means 213. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an electronic device that receives a satellite signal transmitted from a position information satellite such as a GPS satellite and obtains time information, and a leap second update information receiving method thereof.

  Conventionally, there is a GPS receiver that receives a GPS signal from a GPS (Global Positioning System) satellite and measures its own position. The GPS signal transmitted from the GPS satellite includes navigation data indicating the orbit of the GPS satellite. The GPS receiver measures its own position based on the navigation data and time data of the received GPS signal.

  In addition, the navigation data includes accurate time information of an atomic clock mounted on the transmission source GPS satellite. There is known a time measuring device having means for correcting the leap second of the internal time data measured by the time measuring means using the time information included in the navigation data and the leap second correction data relating to the leap second correction ( Patent Document 1).

  The timepiece device described in Patent Document 1 first acquires identification information and time information of subframes and pages from navigation data transmitted from GPS satellites. Next, the time until the leap second correction data is transmitted is calculated, and the navigation data is received by the receiving means when the leap second correction data is received. Then, the leap second of the internal time data of the time measuring means is corrected based on the leap second correction data included in the received navigation data.

JP 2008-145287 A

  By the way, the timing device of Patent Document 1 performs the reception operation even when the reception operation is not necessary or in a place where the GPS satellite cannot be received, and the power consumption increases. For this reason, there is a problem that the duration time is shortened in a portable small device having a small battery capacity such as a wristwatch.

  In view of the above problems, the present invention provides an electronic device that can efficiently acquire leap second information, reduce power consumption, and display an accurate time, and a leap second update information receiving method thereof. For the purpose.

The electronic apparatus of the present invention captures a position information satellite, receives a satellite signal transmitted from the captured position information satellite, a time measuring means for measuring time, a leap second update date and time and an updated An acquisition period determination unit that determines that it is a period for acquiring leap second update information including leap second information, a reception environment determination unit that determines that the environment is suitable for reception of the satellite signal, and the satellite signal And a reception timing determination unit that detects a reception timing of the leap second update information by detecting a timing at which the leap second update information is transmitted, and a determination that the acquisition period determination unit has reached the acquisition period of the leap second update information is, and the fact by the reception environment determination means is environment suitable for reception is determined, further determining that it is now the reception timing of leap seconds update information by the reception timing determination means If it is, the receiving the satellite signal to acquire the leap seconds update information, and leap seconds update information obtaining means for holding, the date and time clocked by the clock means, held by the leap seconds update information obtaining means Time update means for updating the time measured by the time measuring means based on the updated leap second information when the leap second update date / time of the leap second update information is reached, and the leap second update Display means capable of displaying a timing at which information is transmitted; leap second update information acquisition determination means for determining whether the leap second update information acquisition means has acquired and held the leap second update information; and When the second update information acquisition determination unit determines that the leap second update information is not acquired and held, the timing at which the leap second update information is transmitted is calculated, and the timing is displayed by the display unit. Display of transmission timing to be displayed Characterized in that it comprises a stage, a.

According to the present invention, since the acquisition period determining means for determining that the period for acquiring the leap second update information including the leap second update date and time and the leap second information after the update has been provided, the acquisition period is set in advance. Only the leap second update information acquisition operation can be performed. For example, in general, 7/1 or 1/1 is set as the date and time for updating leap seconds in Japan time. In this case, the acquisition period of the leap second update information is set to 3 months immediately before the leap second update date, specifically, 4/1 to 6/30 and 10/1 to 12/31 in Japan time. In this case, it is not necessary to perform leap second update information acquisition operation during other periods. And by setting such an acquisition period, it is possible to receive when the date and time when there is a possibility of updating leap seconds is approaching, and the reception process itself is not performed more than three months ago. Therefore, leap second update information can be acquired efficiently, wasteful reception processing can be reduced, and power consumption can be reduced.
In addition to the above-described conditions for the acquisition period, the reception environment determination means for determining that the environment is suitable for satellite signal reception includes leap seconds limited to places where the reception environment is good. An update information acquisition operation can be performed. As a result, when the user is in a place where the satellite signal cannot be received (such as indoors), the receiving operation is not performed, so that the time for performing the receiving operation can be minimized and the power consumption can be reduced.
Then, when the date and time counted by the timing means becomes the leap second update date and time of the leap second update information held by the received leap second update information acquisition means, the time is set based on the updated leap second information. Since it is updated, leap seconds can be reliably corrected at an appropriate timing.

According to the present invention, since the leap second update information reception timing determination means is provided, the leap second update information transmission timing is obtained when the leap second update information acquisition period is reached and the environment is suitable for reception. In addition, reception processing can be performed. For this reason, leap second update information can be acquired by a short-time reception process, and power consumption can be reduced.
For example, in a satellite signal transmitted from a GPS satellite, leap second update information is included in page 18 of subframe 4 and is transmitted every 12 minutes and 30 seconds. For this reason, if the reception timing is unknown, reception must be continued for a maximum of about 12.5 minutes. In contrast, in the present invention, since reception timing determination means is provided, it is sufficient to perform reception processing only at the timing at which the page 18 of the subframe 4 is transmitted, and it is sufficient to perform reception for a maximum of about 30 seconds. For this reason, the present invention can significantly reduce the reception processing time and power consumption as compared with the case where the reception timing determination means is not provided.

The reception timing can be easily determined, for example, by performing leap second update information acquisition processing after time measurement processing (time acquisition processing). That is, a time measurement process for receiving satellite signals and acquiring time information is set to be performed periodically at intervals such as once a day. Since the subframe and page number of the received satellite signal can be identified during this time measurement process, it is possible to calculate when the page 18 of the subframe 4 including leap second data is transmitted next.
Accordingly, if the leap second update information acquisition process is performed in accordance with the calculated transmission timing after the regular time measurement process (time acquisition process), the reception process can be performed in a short time.

According to the present invention, when it is determined by the leap second update information acquisition determination means that the leap second update information is not acquired and held, the transmission timing display means transmits the timing at which the leap second update information is transmitted. it's shown. As a result, the user can be notified that leap second update information has not been acquired even though the date on which there is a possibility of leap second update is approaching, and that the user needs to receive it. it can.
Therefore, the probability that the user who confirmed this display will move to a place where it can be received according to the transmission timing and receive leap second update information is increased, and there is a possibility that leap second update information can be acquired by the leap second update date. Can be improved.

  In the electronic device of the present invention, the display means is configured to be able to display the time measured by the time measuring means, and the transmission timing display means is a timing at which the leap second update information is transmitted using the display means. Is preferably displayed in a countdown manner.

According to the present invention, the transmission timing display means displays the timing at which the leap second update information is transmitted in a countdown manner using the display means capable of displaying the time measurement time. For example, the display means may count down by moving the second hand counterclockwise, or may count down using a display capable of digital display.
If the transmission timing of leap second update information is displayed in a countdown, the user can easily grasp the remaining time until the leap second update information is transmitted and move to a state suitable for reception at the time of transmission, for example, outdoors. It is possible to take measures such as maintaining the electronic device in a stationary state. For this reason, the possibility that leap second update information can be received can also be improved.
Furthermore, since the transmission timing is normally displayed using a pointer or a display for displaying the time, it is not necessary to separately provide a display means for displaying the transmission timing. For this reason, the structure of the electronic device can be simplified and the cost can be reduced as compared with the case where a dedicated display means is separately provided.

In the electronic device of the present invention, the leap second update information acquisition unit is configured so that the leap second update date and time of the leap second update information held in the leap second update information acquisition unit is based on an internal time measured by the time measurement unit. In the former case, it is preferable not to receive leap second update information.
According to the present invention, when the leap second update date and time of the leap second update information held in the leap second update information acquisition means is earlier than the current internal time, the latest leap second update information is already held. Will be. In this case, even if leap second update information is received again, only the same data is received. The leap second update information acquisition unit of the present invention does not receive leap second update information in such a case, so that useless reception processing can be prevented and power consumption can be reduced.

The electronic apparatus of the present invention captures a position information satellite, receives a satellite signal transmitted from the captured position information satellite, receives a satellite signal, measures a time, and controls the reception means at least regularly. A time acquisition unit that performs reception processing and acquires time information from the received satellite signal, and includes a leap second update date and time and an updated leap second information when the time acquisition unit acquires the time information. An acquisition period determination unit that determines that it is a period for acquiring second update information, a reception environment determination unit that determines that the environment is suitable for reception of the satellite signal, and a leap second update by the acquisition period determination unit It is determined that the information acquisition period has been reached, the reception environment determination unit determines that the environment is suitable for reception, and the leap second update date and time before the internal time measured by the time measurement unit Including the leap second update information acquisition means for controlling the reception means to perform reception processing, acquiring the leap second update information from the received satellite signal, and holding the leap second update information, When the date and time counted by the timing means becomes the leap second update date and time of the leap second update information held by the leap second update information acquisition means, the time measurement based on the updated leap second information Time update means for updating the time counted by the means.

  In the electronic device of the present invention, the leap second update information acquisition unit obtains the leap second update information when a predetermined period has not elapsed since the leap second update information acquisition unit acquired and held the leap second update information. It is preferable not to receive.

Here, the predetermined period can be set as appropriate, but normally it may be set to a period longer than the acquisition period of leap second update information. For example, if the acquisition period is 3 months, the predetermined period may be set to 3 months or more, for example, 6 months.
The leap second update information is transmitted from a predetermined period (for example, six months ago) before the leap second update date to the leap second update date. Therefore, when the latest leap second update information is acquired in the leap second update information acquisition period, the leap second update information having the same contents is transmitted until the leap second update date elapses. Therefore, when the leap second update information is acquired, it is not necessary to receive it again until the leap second update date elapses.
In the present invention, when the leap second update information is acquired, the leap second update information is not received again until a predetermined period elapses, so that unnecessary reception processing can be prevented and power consumption can be reduced. .

The present invention captures a position information satellite, receives a satellite signal transmitted from the captured position information satellite, a time measuring means for measuring time, leap second update date and time, and updated leap second information. A display means capable of displaying the timing at which the leap second update information is transmitted, and a method for receiving the leap second update information of an electronic apparatus, wherein it is determined that the leap second update information has been acquired An acquisition period determination step, a reception environment determination step for determining whether the environment is suitable for reception of the satellite signal, and a timing at which the leap second update information is transmitted in the satellite signal to detect leap second update information. and reception timing determining step of determining the reception timing, the acquisition period determination step that became acquisition period of leap seconds update information is determined by, and environmental der suitable for received in the reception environment determination step Leap it is judged further, when the by the reception timing determining step becomes the reception timing of leap seconds update information has been determined, that by receiving the satellite signal to acquire the leap seconds update information, held When the second update information acquisition step and the date and time counted by the time measuring means become the leap second update date and time of the leap second update information held in the leap second update information acquisition step, A time update step for updating the time measured by the time measuring unit based on second information, and a leap second update for determining whether the leap second update information is acquired and held in the leap second update information acquisition step When it is determined in the information acquisition determination step and the leap second update information acquisition determination step that the leap second update information is not acquired and held, the timing at which the leap second update information is transmitted is calculated. Before that timing Characterized in that it comprises a transmission timing display step of displaying on the display means.

The present invention relates to a leap second update information receiving method for an electronic apparatus, comprising: a receiving unit that captures a position information satellite and receives a satellite signal transmitted from the captured position information satellite; and a time measuring unit that measures time. A time acquisition step for performing reception processing by controlling the receiving means at least regularly, and acquiring time information from the received satellite signal, and when acquiring the time information in the time acquisition step, An acquisition period determination step for determining that it is a period for acquiring leap second update information including update date and time and updated leap second information, and a reception environment determination for determining that the environment is suitable for receiving the satellite signal And the acquisition period determination step determines that the acquisition period of leap second update information has been reached, and the reception environment determination step determines that the environment is suitable for reception. When the leap second update information including the leap second update date and time prior to the internal time being measured is not held, the reception means is controlled to perform reception processing, and the leap second update is performed from the received satellite signal. The leap second update information acquisition step of acquiring and holding information, and the date and time counted by the time measuring means become the leap second update date and time of the leap second update information held in the leap second update information acquisition step And a time updating step of updating the time measured by the time measuring means based on the updated leap second information.
Also in the leap second update information receiving method of these electronic devices, the same operational effects as the electronic devices can be obtained.

It is the schematic which shows the wristwatch with GPS which is an electronic device which concerns on this invention. It is the schematic which shows the main circuit structures of the wristwatch with GPS of FIG. It is a block diagram which shows the main system configurations etc. of 1st embodiment of this invention. It is a figure which shows the format of navigation data. It is a figure which shows the transmission timing of leap second update information. It is a flowchart which shows the reception process of 1st embodiment of this invention. It is a flowchart which shows the reception process of 1st embodiment of this invention. It is a graph which shows an example of the relationship between illumination intensity and electric power generation amount. It is a block diagram which shows the main system configurations etc. of 2nd embodiment of this invention. It is a flowchart which shows the reception process of 2nd embodiment of this invention. It is a flowchart which shows the reception process of 2nd embodiment of this invention.

[First embodiment]
Hereinafter, a first embodiment according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing a wristwatch 1 with a GPS satellite signal receiving device (hereinafter referred to as “GPS wristwatch 1”) which is an electronic apparatus according to the present invention. FIG. 2 is a schematic diagram showing the main hardware configuration of the GPS wristwatch 1.
As shown in FIG. 1, the GPS wristwatch 1 includes a time display unit including a dial 2 and hands 3. An opening is formed in a part of the dial plate 2, and a display 4 composed of an LCD display panel or the like is incorporated.

The pointer 3 includes a second hand, a minute hand, an hour hand, and the like, and is driven by a step motor through a gear.
The display 4 is composed of an LCD display panel and the like, and displays message information as well as position information such as latitude, longitude, and city name.
The GPS wristwatch 1 receives satellite signals from a plurality of GPS satellites 5 orbiting the earth in a predetermined orbit to acquire satellite time information, correct internal time information, or position information. That is, the current position can be displayed on the display 4.
The GPS satellite 5 is an example of the position information satellite in the present invention, and a plurality of GPS satellites 5 exist above the earth. Currently, about 30 GPS satellites 5 orbit.

  The GPS wristwatch 1 is provided with a button 6 and a crown 7 which are external operation members.

[Circuit configuration of GPS wristwatch]
Next, the circuit configuration of the GPS wristwatch 1 will be described.
As shown in FIG. 2, the GPS wristwatch 1 includes a GPS device (GPS module) 10, a control device (CPU) 20, a storage device (storage unit) 30, an input device 40, a display device 50, a power supply 60, and a solar panel 70. It has. The storage device 30 includes a RAM 31 and a ROM 32. Each of these devices communicates data via the data bus 80 or the like.
The display device 50 includes the pointer 3 and the display 4 that display time and positioning information.
The power source 60 is a secondary battery capable of storing the power generated by the solar panel 70.

[Configuration of GPS device]
The GPS device 10 includes a GPS antenna 11 and processes satellite signals received via the GPS antenna 11 to acquire time information and position information.
The GPS antenna 11 is a patch antenna that receives satellite signals from a plurality of GPS satellites 5 orbiting the earth over a predetermined orbit. The GPS antenna 11 is disposed on the back side of the dial 2 and is configured to receive radio waves that have passed through the surface glass of the GPS wristwatch 1 and the dial 2.
For this reason, the dial 2 and the surface glass are made of a material that transmits radio waves that are satellite signals transmitted from the GPS satellite 5. For example, the dial 2 is made of plastic.

  Although not shown, the GPS device 10 receives a satellite signal transmitted from the GPS satellite 5 and converts it into a digital signal, as in the case of a normal GPS device, and a correlation between the received signals. A BB unit (baseband unit) that performs determination and synchronizes, and an information acquisition unit that acquires time information and positioning information from a navigation message (satellite signal) demodulated by the BB unit.

The RF unit includes a bandpass filter, a PLL circuit, an IF filter, a VCO (Voltage Controlled Oscillator), an ADC (A / D converter), a mixer, an LNA (Low Noise Amplifier), an IF amplifier, and the like.
The satellite signal extracted by the band pass filter is amplified by the LNA, mixed with the VCO signal by the mixer, and down-converted to IF (Intermediate Frequency). The IF mixed by the mixer passes through an IF amplifier and IF filter, and is converted into a digital signal by an ADC (A / D converter).

The BB unit includes a local code generation unit that generates a local code composed of the same C / A code as that used at the time of transmission by the GPS satellite 5, and a correlation value between the local code and a reception signal output from the RF unit. And a correlation unit for calculating.
If the correlation value calculated by the correlator is equal to or greater than a predetermined threshold, the C / A code used for the received satellite signal matches the generated local code, and the satellite signal is captured. (Synchronized). Therefore, the navigation message can be demodulated by correlating the received satellite signal with the local code.

The information acquisition unit acquires time information and position information from the navigation message demodulated by the BB unit. That is, the navigation message transmitted from the GPS satellite 5 includes preamble data, HOW (Handover Word) TOW (Time of Week, also referred to as “Z count”), and subframe data. There are subframe data from subframe 1 to subframe 5. Each subframe includes, for example, satellite correction data including week number data and satellite health data, and ephemeris (detailed orbit information for each GPS satellite 5). ) And almanac (rough orbit information of all GPS satellites 5).
Therefore, the information acquisition unit extracts a predetermined data portion from the received navigation message, and acquires time information and position information. Therefore, in the present embodiment, the GPS device 10 constitutes a receiving unit.

The ROM 32 of the storage device 30 stores a program executed by the control device 20.
On the other hand, the RAM 31 of the storage device 30 stores satellite signals acquired by reception, time correction information to be described later, position information calculated by positioning calculation, and the like. Therefore, the RAM 31 constitutes a time correction information storage unit 31A of the present invention described later.

FIG. 3 shows a system configuration block of the wristwatch 1 of the present embodiment.
The control unit 20 controls the satellite signal receiving unit 10 </ b> A of the GPS device 10, stores the time correction information in the time correction information storage unit 31 </ b> A of the RAM 31, and controls the display device 50 via the time display driving unit 51.

  As described above, the control unit (CPU) 20 performs various controls by the program stored in the ROM 32. For this reason, the control unit 20 includes the reception environment determination unit 211, the acquisition period determination unit 212, the reception control unit 213, the previous acquisition elapsed period determination unit 214, the reception timing calculation unit 215, the reception timing determination unit 216, and the leap second update information acquisition. A determination unit 217, an acquisition time elapsed period determination unit 218, a notification unit 219, and a time information correction unit 220 are provided.

  The reception environment determination unit 211 refers to the amount of power generated by the solar panel 70 and determines whether the environment is suitable for receiving satellite signals. For example, when the power generation amount from the solar panel 70 is equal to or greater than a predetermined value, the reception environment determination unit 211 acquires an environment suitable for receiving a satellite signal, that is, a satellite signal when the wristwatch 1 is outdoors. Judge that it is possible. On the other hand, if the power generation amount from the solar panel 70 is less than the predetermined value, the reception environment determination unit 211 determines that the wristwatch 1 is indoors and is not suitable for receiving satellite signals. To do.

  The acquisition period determination unit 212 determines that it is a period for acquiring leap second update information based on the internal clock. Specifically, the acquisition period determination unit 212 determines whether or not a predetermined period before the leap second update date has come. Since the leap second insertion date is July 1 or January 1 when the first priority is Japan time, in this embodiment, as the acquisition period of the leap second update information, the first priority of July 1 and Three months before January 1 are set as the beginning of the acquisition period, and June 30 and December 31 are set as the end. For this reason, the acquisition period determination means 212 is in Japan time from April 1 to June 30 (a period from three months before July 1) and from October 1 to December 31 (January 1). (Period from 3 months ago), it is determined that the acquisition period of leap second update information has come.

The reception control means 213 controls the satellite signal reception unit 10A of the GPS device 10 to perform reception processing.
As will be described later, the reception control unit 213 of the present embodiment includes a time acquisition unit that performs reception control for periodically acquiring time information, and a leap second update that performs reception control to acquire leap second update information. It functions as information acquisition means.

  The satellite signal receiving unit 10A is controlled in operation by the reception control means 213. When time information is acquired, the time information is stored in the time correction information storage unit 31A, and when leap second update information is acquired, Second update information is stored in the time correction information storage unit 31A.

  The reception timing calculation means 215 calculates reception timing of leap second update information. Specifically, the reception timing of the leap second update information is calculated based on the information when the reception control means 213 and the satellite signal reception unit 10A receive the time information. This calculation method will be described with reference to FIGS.

FIG. 4 is a diagram showing a frame structure of the navigation message.
The satellite signal transmitted from the GPS satellite includes data called a navigation message. This navigation message includes orbit information, time information, etc., and this data is transmitted at a speed of 50 bps.
One cycle of the navigation message is called a unit called a frame, and has a structure as shown in FIG. Since one frame is 1500 bits, it takes 30 seconds to transmit it. A frame is composed of five sets of subframes, each having a size of 300 bits. Transmission starts in order from subframe 1 and when transmission to subframe 5 is completed, transmission returns to subframe 1 again.

  Of the five sets of subframes, subframes 1 to 3 contain information specific to each satellite, so the same content is repeatedly transmitted each time. Specifically, the clock correction information of the transmitting satellite itself, Orbital information (ephemeris) is included. On the other hand, subframes 4 and 5 include orbit information (almanac) and ionosphere correction information of all satellites, and these are divided into pages and accommodated in subframes because of the large number of data.

  That is, the data transmitted in subframes 4 and 5 are each divided into pages 1 to 25, and the contents of different pages are sent in order for each frame. Since it takes 25 frames to transmit the contents of all pages, it takes 12 minutes and 30 seconds to receive all the information of the navigation message.

FIG. 5 shows the transmission timing of leap second update information. The leap second update information is stored in the page 18 of the subframe 4 as shown in FIG. Specifically, the current leap second Δt _LS , leap second update week WN _LSF , leap second update date DN, and updated leap second Δt _LSF are stored in bit positions 241 to 278 of subframe 4 and page 18. Has been. Among these, the leap second update week, the leap second update date, and the updated leap second are information necessary for the next leap second update process and constitute leap second update information of the present invention. This leap second update information is not stored as data until execution of leap seconds is determined, but when execution is determined, it is stored as data from about six months before the update date. Therefore, if page 18 of subframe 4 is received, leap second update information can be acquired.

On the other hand, since the time information (Z count) is stored in all the subframes, it can be received at intervals of 6 seconds. Further, since the week number is stored in the subframe 1, it can be received at intervals of 30 seconds. When the satellite signal receiving unit 10A is activated for time acquisition, the reception timing calculation unit 215 identifies the page or subframe being received, and the page 18 of the subframe 4 in which the leap second update information is stored. Is calculated as the time until the transmission of, ie, the reception timing.
Then, the reception timing determination unit 216 determines whether or not the reception timing calculated by the reception timing calculation unit 215 has come.

  The previous acquisition elapsed period determination unit 214 determines whether a predetermined period has elapsed since the reception control unit 213 acquired the leap second update information and stored it in the time correction information storage unit 31A. In the present embodiment, 6 months is set as the predetermined period. Therefore, the previous acquisition elapsed period determination unit 214 determines whether or not six months have elapsed since the last leap second update information was acquired.

The leap second update information acquisition determination unit 217 determines whether leap second update information for which the update date has not elapsed has been stored in the time correction information storage unit 31A. That is, even if leap second update information is stored in the time correction information storage unit 31A, if the leap second update date and time is earlier (past) than the time of the internal clock, the latest leap second update information is acquired. It will not be done. In this case, the leap second update information acquisition determination unit 217 determines that leap second update information is not stored.
On the other hand, when the leap second update date / time is stored in the previous (future) leap second update information, the leap second update information acquisition determination unit 217 determines that the leap second update information is stored.

  The acquisition time elapsed period determination unit 218 determines that the leap second update information acquisition determination unit 217 has not acquired the leap second update information, and a predetermined period has elapsed from the start of the leap second update information acquisition period. Judge whether it is. In the present embodiment, three months before the leap second update date is set as the start of the acquisition period, and two months are set as the predetermined period. Therefore, the leap second update information acquisition determination unit 217 determines whether the leap second update information has been acquired and stored in the time correction information storage unit 31A within one month before the leap second update date.

When the acquisition time lapse period determination means 218 is not able to acquire leap second update information even within one month before the leap second update date, the notification means 219 performs a periodic time information reception process. The reception timing calculated by the reception timing calculation means 215 is displayed on the display device 50 using the time display driving unit 51.
Specifically, the notification means 219 moves the second hand of the pointer 3 counterclockwise to display the reception timing in a countdown method or displays it on the display 4 in a countdown method.

  The time information correction unit 220 corrects the time of the internal clock based on the time information stored in the time correction information storage unit 31A, the current leap second, and the time difference information of the current location. The time difference information may be set manually by the user, or a satellite signal is received and a positioning process is performed to obtain the current location, and time difference information corresponding to the current location is obtained from the time difference table stored in the RAM 31. May be set.

In addition, when the leap second update information is acquired, the time information correction unit 220 updates the current leap second to the updated leap second when the leap second update date / time is reached, and corrects the time being measured. . Therefore, the time information correction unit 220 constitutes the time update means of the present invention.
Furthermore, the time information correction unit 220 measures the internal time based on a reference signal from an oscillation circuit (not shown) and continues to update the time display on the display device 50 via the time display drive unit 51. Therefore, the time information correcting unit 220 also constitutes the time measuring means of the present invention.
The time display drive unit 51 is a motor that drives the hands 3 and a circuit that drives the display 4.

[Receive processing]
Next, the control in the control part 20 is demonstrated with reference to the flowchart of FIG. The processes of FIGS. 6 and 7 are processes in the case of continuously receiving leap second update information when receiving time information periodically.
First, the reception control unit 213 operates the satellite signal receiving unit 10A at regular time every day to perform reception processing and acquire time (S11). Since the time information is stored in all subframes as described above, it can be received at intervals of 6 seconds. Here, when the time signal is acquired, the satellite signal receiving unit 10A stores the time information in the time correction information storage unit 31A.

After the time is acquired in S11, the leap second update information acquisition determination unit 217 indicates that the leap second update information stored in the time correction information storage unit 31A is time information after (future) the current time. Is determined (S12).
If there is no leap second update information after the current time (Yes in S12), since the leap second update information necessary for the time correction information storage unit 31A is not stored, the acquisition period determination unit 212 determines whether the acquisition period determination means 212 is S11. Whether or not the current date and time is the leap second update information acquisition period is determined based on the internal clock timed based on the time information acquired in (S13).
In the present embodiment, the leap second update time is set to July 1 and January 1 as the first priority date, and the predetermined period is set to three months, so that the leap second update date is July 1 The period from 3 months before January 1 is the leap second update information acquisition period.

When it is determined in S13 that the leap second update information is the predetermined period (Yes in S13), the previous acquisition elapsed period determination unit 214 acquires the leap second update information stored in the time correction information storage unit 31A. It is determined whether or not a predetermined period has elapsed (S14).
In this embodiment, when six months have elapsed since the leap second update information was acquired last time, it is determined as Yes in S14.

When it is determined “NO” in S12 to S14, the reception control unit 213 ends the reception process without receiving the leap second update information.
That is, if leap second update information after the current time is stored in S12, leap second information to be executed next has already been received. Therefore, even if the leap second update information is received again, only the same data is received, and this is a useless reception process.
If it is not the leap second update information acquisition period in S13, the leap second update information does not need to be received at this time because the leap second update date is empty.
Furthermore, if the predetermined period has not elapsed since the previous acquisition in S14, it is unlikely that leap second update information can be received even if reception is performed. For example, if a leap second update is not scheduled for the next 7/1, even if leap second update information is received during the acquisition period from three months ago, there is no leap second update data itself, so the time correction It is not stored in the information storage unit 31A. Therefore, when the reception process is performed again on the next day, S12 is determined as Yes because there is no stored data, and S13 is also determined as Yes because it is a leap second update information acquisition period. For this reason, if there is no determination of S14, reception of leap second update information will be repeated every day when there is no leap second update plan.
In consideration of these points, in S12 to S14, the reception control unit 213 ends the reception process without receiving the leap second update information.

  On the other hand, if “Yes” is determined in S12 to S14, the reception timing calculation unit 215 calculates the reception timing from the data at the time of reception processing of the time information in S11. The reception timing calculation means 215 identifies the received page or subframe, and broadcasts page 18 of subframe 4 including leap second correction data out of all 12 minutes 30 seconds data transmitted from the GPS satellite. Time (transmission timing) is calculated (S15).

  Next, the acquisition time elapsed period determination unit 218 determines whether a predetermined period has elapsed from the start of the leap second update information acquisition period (S16). In this embodiment, three months before the leap second update date is set as the start of the leap second update information acquisition period and the predetermined period is set to two months. Therefore, when the leap second update date is within one month, the time correction information storage unit 31A Determines whether leap second update information is stored in.

When it is determined Yes in S16, the notification unit 219 displays a message such as “Please move to a location where GPS can be received” on the display 4 to notify the user of leap second update information acquisition ( S17).
In other words, since “Yes” is determined in S12 to S14, if “Yes” is determined in S16, the leap second update information is still included in the time correction information even within one month of the leap second update date. It is not stored in the storage unit 31A. In such a state where the leap second update date is approaching, it is desired to notify the user that the leap second update information needs to be acquired so that the leap second update information can be reliably received. Therefore, the notification unit 219 performs leap second update information acquisition notification as described above (S17).

  In addition, the notification unit 219 displays the leap second update information acquisition timing calculated in S15 on the display device 50 using the time display driving unit 51 (S18). At this time, as described above, the notification unit 219 moves the second hand of the pointer 3 counterclockwise to display the leap second update information acquisition timing in the countdown method or displays it on the display 4 in the countdown method.

  If the acquisition time elapsed period determining means 218 determines “NO” in S16, the leap second update information acquisition notification and the countdown display are still available because there is still a margin for acquiring the leap second update information. Without proceeding to S19.

Next, the reception environment determination unit 211 determines whether the location is a GPS receivable place (S19). In this embodiment, the reception environment determination unit 211 determines whether the user is in a GPS receivable place by determining whether the power generation amount of the solar panel 70 is equal to or greater than the power generation amount threshold.
Here, the power generation amount threshold value is set based on the relationship between the illuminance of light incident on the solar panel 70 and the power generation amount. FIG. 8 is a graph showing the relationship between the relative power generation amount and the illuminance when the power generation amount of 10000 lx (lux) is 1. As shown in FIG. 8, the amount of power generated by the solar panel 70 is the highest on a clear day (daytime), and the amount of power generated on a cloudy sky is lower than that on a clear sky. Furthermore, in the case of indoors, the amount of power generation is reduced compared to cloudy weather.
As the power generation environment, the outdoor power generation environment is better than indoors regardless of whether it is cloudy or sunny, the power generation amount threshold is the amount of power generation indoors (about 5000 lx or less) and outdoors (about 5000 lx or more). Is set to a value that can be distinguished. In the case of FIG. 8, if the power generation amount threshold value in the relative power generation amount is set to about 0.5, it can be determined from the power generation amount whether it is indoors or outdoors. When the user is outdoors, the reception environment from the GPS satellite can also be considered good.

  If it is determined “NO” in S <b> 19, the reception environment determination unit 211 determines that the environment is not suitable for satellite signal reception, and terminates the reception process without performing reception.

On the other hand, if it is a GPS receivable place in S19, the reception timing determination means 216 determines whether the time of the internal clock has reached the reception timing calculated in S15 (S20). Here, if it is not the reception timing yet, the process returns to S19, and the reception environment determination unit 211 determines again whether the GPS reception is possible, thereby matching the timing.
If the reception control means 213 determines that the reception timing is reached by the reception timing determination means 216, the reception control means 213 controls the satellite signal reception unit 10A of the GPS device 10 to perform reception processing and acquire leap second update information (S21).

  After performing the reception process in S21, the leap second update information acquisition determination unit 217 determines whether leap second update information has been received (S22). The leap second update information acquisition determination unit 217 attempts to receive up to three times by returning to S15 again when reception is not possible due to a shift in reception timing or a reception environment (S23). Here, the leap second update information acquisition timing is calculated again in S15. Since the reception timing comes every 12 minutes and 30 seconds, the reception timing can be calculated by adding 12 minutes and 30 seconds to the previous timing. If the leap second update information has not been received even after three retries (Yes in S23), the reception control means 213 terminates the reception process without receiving the leap second update information.

If it is determined in S22 that the leap second update information has been received, the satellite signal receiving unit 10A stores the received leap second update information and leap second update information reception history in the time correction information storage unit 31A (S24). .
As described above, the leap second update information reception process executed subsequent to the scheduled time information reception process is completed.

  When the leap second update information received in the reception process is stored in the time correction information storage unit 31A, the time information correction unit 220 sets the internal time to the leap second update date (usually 7/1 or When it becomes 1/1), the time of the internal clock is updated using the new leap second information.

[Operational effects of the first embodiment]
According to the present embodiment, since the acquisition period determination unit 212 determines the acquisition period of the leap second update information, the reception process may be performed only during the period in which the leap second update information needs to be acquired. Can be acquired efficiently, wasteful reception processing can be reduced, and power consumption can be reduced.
In addition, since reception is performed in accordance with the reception timing calculated by the reception timing calculation means 215, leap second update information can be acquired reliably and efficiently. That is, by providing the reception timing determination means 216, only the page 18 of the subframe 4 can be received, so that the reception time can be shortened to about 30 seconds at the maximum, and reception without calculating the reception timing is possible. The power consumption can be reduced compared to the case of doing so.

  In addition, the reception environment is determined based on the power generation amount of the solar panel 70, and the satellite signal is efficiently received only when the reception environment is good. Power consumption can be reduced and battery life can be extended.

  Further, in the present embodiment, the reception process is not executed when the latest leap second update information has been acquired in S12, so that the reception process can be minimized. In this respect as well, power consumption can be reduced and battery life can be extended.

  Also, if a predetermined period has not elapsed since the previous acquisition of leap second update information, the reception of leap second update information is wastefully repeated when there is no leap second update schedule due to S13. Can be prevented.

  Furthermore, the acquisition time elapsed period determination means 218 and the notification means 219 are provided, and when the leap second update date approaches, the user is notified that the reception is required, so that the user can also realize that the reception is necessary. This increases the probability that the leap second update information can be received by moving to a place where the reception environment is good. In addition, since this notification is limited to the case where leap second update information is not acquired even within one month immediately before the leap second update date, the burden on the user can be minimized.

  Since the notification means 219 displays the notification of reception timing to the user in a countdown manner, the user can easily grasp the remaining time until the leap second update information is transmitted, and can receive it at the time of transmission. Appropriate measures such as moving to an appropriate state, for example, moving outdoors and maintaining the electronic device in a stationary state can be performed. For this reason, the possibility that leap second update information can be received can also be improved.

[Second Embodiment]
Next, a second embodiment according to the present invention will be described. In the second embodiment, the same components as those of the GPS wristwatch 1 of the first embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.
FIG. 9 is a block diagram showing a main system configuration and the like of the second embodiment of the present invention.

  The GPS wristwatch 1 of the second embodiment shown in FIG. 9 is different from the first embodiment in that the reception timing calculation unit 215 and the reception timing determination unit 216 are not provided and the reception timing is not taken into consideration. Since other configurations and processes are the same as those in the first embodiment, description thereof is omitted.

The control in the control part 20 is demonstrated with reference to the flowchart of FIG.
In the present embodiment, the processes from S11 to S14 are the same as those in the first embodiment. In S14, it is determined whether a predetermined period has elapsed since the previous leap second update information acquisition. If the predetermined period has elapsed, the process proceeds to step S16 without calculating leap second update information acquisition timing. In S16, if the predetermined period has elapsed since the beginning of the leap second update information acquisition period, only the leap second update information acquisition notification is performed (S17), and the GPS reception location of S19 is displayed without displaying the reception timing countdown. Proceed to the decision.

  If it is determined that the location is a GPS receivable location, leap second update information is acquired in S21. At this time, since the reception timing is not determined, the reception is continued from the start of reception until the leap second update information is acquired. When the page 18 of the subframe 4 is received, the reception process is terminated. For this reason, it may take up to 12 minutes and 30 seconds for all navigation data to be transmitted before receiving leap second update information. If it can be received here, the process proceeds to S24. If it cannot be received, the reception process is terminated.

[Effects of Second Embodiment]
Also in the second embodiment, the same effects as those in the first embodiment can be obtained except for the points described below.
That is, in the second embodiment, since it is not necessary to calculate the reception timing, the configuration of the control unit 20 can be simplified.
In addition, when calculating the reception timing, it is necessary to receive time information immediately before, but in this embodiment, since reception timing is not calculated, only reception of leap second update information is performed without reception of time information. It can also be done.

[Modification]
The present invention is not limited to the above embodiments.
For example, the reception environment determination unit 211 is not limited to the determination based on the power generation amount of the solar panel 70 as in the above embodiments. For example, the reception environment determination unit 211 may determine whether or not the GPS wristwatch 1 such as an ultraviolet sensor is disposed outdoors.
Further, when the manual operation of the reception button by the user is detected and the manual operation is performed, the user is explicitly performing the reception process, so that it may be determined that the reception environment is good. .

  Further, when the leap second update information acquisition timing is calculated in S15, the leap second update information transmission timing is displayed by the countdown method. However, not only the countdown method, but only the leap second update information transmission timing time is displayed on the display 4. The transmission timing may be displayed by displaying it or displaying it in a manner that is easy for the user to understand (for example, turning on the display or changing the rotation method of the second hand) a predetermined time before the leap second update information transmission timing.

  In S17, a message such as “Please move to a location where GPS can be received” is displayed on the display 4 to notify the user of the leap second update information acquisition. The display content is not limited to this as long as it is received.

In S16, while the predetermined period has not elapsed since the beginning of the leap second update information acquisition period, the reception is performed without notifying the user, but the reception is always notified before the reception. You may do it.
Further, the notification may be made only when it is determined that the user is in an environment where GPS reception is not possible.

  Further, in each of the embodiments described above, the notification unit 219 is provided to perform the leap second update information acquisition notification process (S17) and the leap second update information transmission timing countdown display (S18), but these processes are not performed. You may do it. That is, in the embodiment, until the leap second update information is acquired, the leap second update information is received every day for three months immediately before the leap second update date. For this reason, it is very likely that leap second update information can usually be acquired during about 120 reception processes. Therefore, there is a high possibility that leap second update information can be acquired without notifying the user by the notification means 219, and there is no practical problem.

In each of the embodiments described above, the determinations in S12 and S14 are performed to eliminate useless reception processing. However, these determination processing may not be performed. In other words, the present invention only needs to determine at least whether it is the acquisition period of leap second update information in S13 and the reception environment in S19, and other determination conditions are not necessarily performed. Also good.
However, the determination of S12 and S14 is advantageous in that useless reception can be prevented and power consumption can be reduced.

  In each of the embodiments described above, the case has been described in which leap second update information is received following the reception processing of the scheduled time information. However, reception may be performed by a user's manual operation. In this case, the user can determine the location where the reception environment is good and perform the receiving operation in advance, so that the probability that the leap second update information can be received increases, and the leap second update information can be acquired by the leap second update date. The possibility can be improved.

  DESCRIPTION OF SYMBOLS 1 ... GPS wristwatch, 3 ... Hand, 4 ... Display, 5 ... GPS satellite, 10 ... GPS device, 11 ... GPS antenna, 20 ... Control part, 211 ... Reception environment judgment means, 212 ... Acquisition period judgment means, 213 ... Receiving control means, 214 ... previous acquisition elapsed period determining means, 215 ... reception timing calculating means, 216 ... reception timing determining means, 217 ... leap second update information acquisition determining means, 218 ... acquisition timing elapsed period determining means, 219 ... notifying means , 220 ... time information correction unit, 30 ... storage device, 31A ... time correction information storage unit, 40 ... input device, 50 ... display device, 51 ... time display drive unit, 60 ... power supply, 70 ... solar panel.

Claims (7)

Receiving means for capturing a position information satellite and receiving a satellite signal transmitted from the captured position information satellite;
A time measuring means for measuring time;
An acquisition period determination means for determining that it is a period for acquiring leap second update information including leap second update date and time and updated leap second information;
Receiving environment determining means for determining that the environment is suitable for receiving the satellite signal;
Reception timing determination means for detecting the timing at which the leap second update information is transmitted in the satellite signal and determining the reception timing of the leap second update information;
The acquisition period determining means determines that the acquisition period of leap second update information has been reached, the reception environment determining means determines that the environment is suitable for reception, and the reception timing determining means further determines A leap second update information acquisition means for receiving and acquiring the leap second update information by receiving the satellite signal when it is determined that it is the reception timing of the second update information;
When the date and time counted by the timing means becomes the leap second update date and time of the leap second update information held by the leap second update information acquisition means, the time measurement based on the updated leap second information Time updating means for updating the time counted by the means;
Display means capable of displaying the timing at which the leap second update information is transmitted;
Leap second update information acquisition determining means for determining whether the leap second update information acquisition means acquires and holds the leap second update information;
When the leap second update information acquisition determining unit determines that the leap second update information is not acquired and held, the leap second update information is transmitted at a timing to be transmitted, and the timing is displayed in the display Transmission timing display means for displaying by means;
An electronic device comprising: The electronic device according to claim 1,
The display means is configured to be able to display the time measured by the time measuring means,
The transmission timing display means displays the timing at which the leap second update information is transmitted using the display means in a countdown manner. The electronic device according to claim 1 or 2,
The leap second update information acquisition means includes:
The leap second update information is not received when the leap second update date and time of the leap second update information held in the leap second update information acquisition means is earlier than the internal time measured by the time measurement means. And electronic equipment. Receiving means for capturing a position information satellite and receiving a satellite signal transmitted from the captured position information satellite;
A time measuring means for measuring time;
Time acquisition means for controlling the reception means at least at regular times to perform reception processing, and acquiring time information from the received satellite signals;
An acquisition period determination unit that determines that it is a period for acquiring leap second update information including leap second update date and time and updated leap second information when the time information is acquired by the time acquisition unit;
Receiving environment determining means for determining that the environment is suitable for receiving the satellite signal;
It is determined that the acquisition period of the leap second update information has been reached by the acquisition period determination unit, the reception environment determination unit determines that the environment is suitable for reception, and is further timed by the timing unit. When the leap second update information including the leap second update date and time before the internal time is not held, the receiving means is controlled to perform reception processing, and the leap second update information is obtained from the received satellite signal And a leap second update information acquisition means to hold,
When the date and time counted by the timing means becomes the leap second update date and time of the leap second update information held by the leap second update information acquisition means, the time measurement based on the updated leap second information Time updating means for updating the time counted by the means;
An electronic device comprising: In the electronic device in any one of Claims 1-4,
The leap second update information acquisition means includes:
An electronic device characterized in that leap second update information is not received when a predetermined period has not elapsed since the leap second update information acquisition means acquired and held the leap second update information. Receiving means for capturing a position information satellite and receiving a satellite signal transmitted from the captured position information satellite;
A time measuring means for measuring time;
A display means capable of displaying a leap second update date and time and a timing at which leap second update information including the updated leap second information is transmitted, and a leap second update information receiving method of an electronic device comprising:
An acquisition period determination step for determining that it is a period for acquiring the leap second update information;
A reception environment determination step for determining that the environment is suitable for reception of the satellite signal;
A reception timing determination step for detecting the timing at which the leap second update information is transmitted in the satellite signal and determining the reception timing of the leap second update information;
In the acquisition period determination step, it is determined that the acquisition period of the leap second update information has been reached, and in the reception environment determination step, it is determined that the environment is suitable for reception. When it is determined that it is the reception timing of second update information, the satellite signal is received to acquire the leap second update information, and the leap second update information acquisition step to hold,
When the date and time counted by the timing means becomes the leap second update date and time of the leap second update information held in the leap second update information acquisition step, the time measurement based on the updated leap second information A time update process for updating the time counted by the means;
A leap second update information acquisition determination step for determining whether or not the leap second update information is acquired and held in the leap second update information acquisition step;
In the leap second update information acquisition determining step, when it is determined that the leap second update information is not acquired and held, the timing at which the leap second update information is transmitted is calculated, and the timing is displayed in the display A transmission timing display step of displaying by means;
A leap second update information receiving method for an electronic device, comprising: Receiving means for capturing a position information satellite and receiving a satellite signal transmitted from the captured position information satellite;
A leap second update information receiving method of an electronic device comprising a time measuring means for measuring time,
A time acquisition step of performing reception processing by controlling the receiving means at least regularly, and acquiring time information from the received satellite signal;
When acquiring the time information in the time acquisition step, an acquisition period determination step of determining that it is a period for acquiring leap second update information including leap second update date and time and updated leap second information;
A reception environment determination step for determining that the environment is suitable for reception of the satellite signal;
It is determined that the acquisition period of the leap second update information has been reached in the acquisition period determination step, and that it is determined that the environment is suitable for reception in the reception environment determination step, and is further timed by the time measuring means. When the leap second update information including the leap second update date and time before the internal time is not held, the receiving means is controlled to perform reception processing, and the leap second update information is obtained from the received satellite signal And the leap second update information acquisition process to be held,
When the date and time counted by the timing means becomes the leap second update date and time of the leap second update information held in the leap second update information acquisition step, the time measurement based on the updated leap second information A time update process for updating the time counted by the means;
A leap second update information receiving method for an electronic device, comprising:

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