JP6750401B2 - Satellite radio receiver, electronic clock, satellite radio capture control method, and program - Google Patents

Description

The present invention relates to a satellite radio wave receiver, an electronic clock, a satellite radio wave capture control method, and a program.

Conventionally, there is a technique of receiving radio waves from a positioning satellite related to GNSS (Global Navigation Satellite System) to acquire accurate date/time information and current position information. Radio waves from positioning satellites can be received regardless of position in the world if radio waves from multiple positioning satellites are open so that radio waves from multiple positioning satellites can be received. In particular, it is widely used in portable electronic devices carried by users moving around the world.

As the GNSS, a GPS (Global Positioning System) in the United States is widely used, and there are many electronic devices that can receive only radio waves from positioning satellites (GPS satellites) related to GPS. On the other hand, there is a technique that uses a quasi-zenith satellite such as Michibiki of Japan as a complementary satellite to improve the reception probability of satellite radio waves in a specific area and to optimize the spatial distribution of positioning satellites to be received.

In the acquisition operation of positioning satellites including complementary satellites whose receivability varies depending on the region, if the order of capturing such complementary satellites is fixed, it may or may not be used. In any of the above cases, there is a problem that the time required for the capture operation unnecessarily increases. On the other hand, Patent Document 1 discloses a technique for improving efficiency by appropriately changing the order of capturing complementary satellites according to time zone information or the like.

JP, 2016-31232, A

However, if the number of positioning satellites to be captured fluctuates depending on the situation, for example, when selecting one of the positioning satellites to be captured, including complementary satellites, for which the conditions such as reception strength are appropriate, and then receiving, However, there is a problem in that the time required for the capturing operation changes, and as a result, the receiving time may be longer than necessary or it may take time and labor to reduce the efficiency of the capturing operation.

An object of the present invention is to provide a satellite radio wave receiver, an electronic clock, a satellite radio wave capture control method, and a program that can easily and efficiently capture and receive radio waves from an appropriate positioning satellite.

In order to achieve the above object, the present invention provides
A reception processing unit that captures and receives at least one of the transmitted radio waves from a plurality of satellites;
A control unit,
Equipped with
In the capturing operation by the reception processing unit, the control unit replaces a part of the transmission radio waves of the preset initialization satellite as a capture target with the transmission radio waves of the additional setting satellites other than the initialization satellite. The satellite radio wave receiving device characterized in that, when the capturing operation is performed for the capturing target and the capturing operation is performed a plurality of times, the part of the transmission radio waves to be exchanged is changed for each capturing operation. Is.

According to the present invention, there is an effect that the satellite radio wave reception device can easily and efficiently capture and receive radio waves from an appropriate positioning satellite.

It is a block diagram which shows the function structure of the electronic timepiece of this embodiment. It is a flow chart which shows a control procedure of positioning processing performed by a satellite electric wave reception processing part. It is a figure explaining the setting of the positioning satellite of the capture object in the capture process in an electronic timepiece. It is a flow chart which shows the control procedure of acquisition control processing performed by a satellite electric wave reception processing part. It is a flow chart which shows the control procedure of the modification 1 of acquisition control processing. It is a figure explaining the setting of the positioning satellite of an acquisition target in the modification 2 of acquisition control processing. It is a flow chart which shows the control procedure of the modification 2 of acquisition control processing.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a block diagram showing a functional configuration of an electronic timepiece 1 including the satellite radio wave receiving apparatus of this embodiment.

The electronic timepiece 1 includes a microcomputer 40, a satellite radio wave reception processing unit 50 (satellite radio wave reception device) and an antenna A1, an operation reception unit 61, a display unit 62, a communication unit 63 and an antenna A2, a power supply unit 70, and the like. Equipped with.

The microcomputer 40 centrally controls the overall operation of the electronic timepiece 1. The microcomputer 40 includes a CPU 41 (Central Processing Unit), a ROM 42 (Read Only Memory), a RAM 43 (Random Access Memory), an oscillation circuit 46, a frequency dividing circuit 47, a clock circuit 48 (clock section), and the like.

The CPU 41 is a processor that performs various arithmetic processes and performs control operations. The ROM 42 stores a program 421 for the CPU 41 to execute a control operation, initial setting data, and the like. As the ROM 42, in addition to a mask ROM, a nonvolatile memory such as a flash memory capable of rewriting and updating data may be included. The RAM 43 provides the CPU 41 with a working memory space and stores temporary data. The RAM 43 defines a local time setting storage unit 431 that stores the time zone setting and daylight saving time setting when displaying and using the current date and time.

The oscillator circuit 46 generates and outputs a signal having a predetermined frequency. For example, a crystal oscillator or the like is used to generate the signal. This crystal oscillator may be externally attached to the microcomputer 40.

The frequency dividing circuit 47 outputs a frequency dividing signal obtained by dividing the frequency signal input from the oscillating circuit 46 by the set frequency dividing ratio. The setting of the frequency division ratio may be changed by the CPU 41.
The clock circuit 48 holds the current date and time by counting the frequency-divided signals of a predetermined frequency input from the frequency dividing circuit 47. The current date and time counted by the clock circuit 48 can be corrected by a control signal from the CPU 41 based on the accurate current date and time acquired by the satellite radio wave reception processing unit 50.

The satellite radio wave reception processing unit 50 receives and processes a radio wave transmitted from a positioning satellite of a satellite positioning system such as the US GPS (Global Positioning System), acquires date and time information and current position information, and outputs them to the CPU 41. The satellite radio wave reception processing unit 50 includes a reception unit 51 (reception processing unit), a control unit 52 (signal processing unit), a storage unit 53, and the like.

The receiving unit 51 includes a capturing unit 511 and a tracking unit 512. The capturing unit 511 performs a capturing process of detecting a radio wave from a positioning satellite (satellite) as a reception target, identifying the positioning satellite, and identifying the phase of a transmission signal. Although the capturing process will be described later in detail, the satellite radio wave reception processing unit 50 of the electronic timepiece 1 according to the present embodiment has a configuration capable of capturing the transmission radio waves from a plurality of positioning satellites in parallel.

The tracking unit 512 acquires the identification information and the phase of the positioning satellite captured by the capturing unit 511 from the capturing unit 511, tracks the radio waves transmitted from the positioning satellite, and continuously demodulates and acquires the navigation message.

The control unit 52 acquires necessary information based on the extracted signal, identifies the current date and time, and calculates the current position (that is, positioning). The control unit 52 acquires at least a portion necessary to obtain desired information among the transmission information from each positioning satellite based on the receivable navigation message format of each positioning satellite. From a signal (L1 band) from a positioning satellite related to GPS (hereinafter, referred to as a GPS satellite), at least the elapsed time in the week (TOW if the date can be identified from the date and time information (the date and time counted by the timing circuit 48)). -Count)), its reception timing, and orbit information of each GPS satellite that has been captured. The current position can be calculated based on the orbit information of each GPS satellite and the timing difference of the current date and time obtained from the GPS satellite. Further, the distance between each GPS satellite and the current position can be used to accurately identify the identified date and time. The delay time from a specific date and time is calculated.

The storage unit 53 stores reception control information 531 such as various setting data and reception information, and a control program 532 executed by the control unit 52 in the satellite radio wave reception processing unit 50. The setting data includes, for example, the format data of the navigation message of each positioning satellite and the reference data for determining the reception level. In addition, the received information includes, for example, predicted orbit information (almanac) of each positioning satellite that has been acquired, leap second implementation notice information, and the like.

The operation receiving unit 61 receives an input operation from the outside such as a user operation. The operation reception unit 61 includes, for example, one or a plurality of push button switches, and outputs a signal according to the pressing operation of the push button switches to the CPU 41.

The display unit 62 displays various information under the control of the CPU 41. The display unit 62 has a display screen and a drive circuit for the display screen. As the display screen, for example, a liquid crystal display screen (LCD) is used, and the drive circuit performs a drive operation related to display by the liquid crystal display screen. The content displayed on the display unit 62 includes information related to the current date and time.

The communication unit 63 performs short-range wireless communication with an external electronic device via the antenna A2 under the control of the CPU 41. Examples of the short-range wireless communication include Bluetooth communication (registered trademark: Bluetooth). Further, examples of the external electronic device include a smartphone of the same user, a mobile phone, various mobile electronic terminals, and the like. The communication unit 63 can acquire positioning satellite operation information from a predetermined server via an electronic device of a communication connection partner.

The power supply unit 70 supplies the power required for each unit of the electronic timepiece 1 to operate to the unit. The power supply unit 70 supplies the power output from the battery 71 with the operating voltage of each unit. When the operating voltage differs depending on the operating part, the power supply unit 70 performs voltage conversion using a regulator and outputs the voltage. The battery 71 may include a solar panel that generates power according to incident light, a secondary battery that stores the generated power, or a detachable battery or rechargeable battery.

Next, the radio waves transmitted from the positioning satellite will be described.
Each positioning satellite transmits a signal (navigation message) whose transmission information is encoded in a format according to the positioning system to which it is spread spectrum by a pseudo random number code string (pseudo random noise; PRN) different for each positioning satellite. ing. The C/A code, which is a pseudo random number code string that is open to the public, is GPS (Global Positioning System; satellite positioning system for the entire earth) and the Japanese Quasi-Zenith Satellite System (QZSS; In the Quasi-Zenith Satellites System (regional positioning system), etc., there is an array of 1023 codes, and this code array is repeatedly used at a cycle of 1 msec (1.023 MHz). In this radio wave receiving device, that is, the electronic timepiece 1, a signal including a navigation message is detected and demodulated by performing inverse spectrum spreading of the received radio wave using the C/A code.

When the receivable positioning satellites are not known, the receiving device applies the C/A codes of all the positioning satellites to the received radio waves in all the phases to calculate the autocorrelation, and thereby the signals are detected. A capture process is performed to identify the type of A/A code (PRN number) and the phase at the time of reception. Normally, 32 positioning satellites are operated in GPS, and the electronic timepiece 1 has a plurality of (predetermined number of 2 or more) positioning satellites, 16 in this case, as the capturing unit 511 of the satellite radio wave reception processing unit 50. By applying the C/A code in parallel to the received radio waves, that is, performing the processing (capturing operation) twice for the radio waves transmitted from 16 positioning satellites in parallel, the efficiency can be reduced in a short time. In particular, a configuration is provided that enables capture processing of radio waves from 32 positioning satellites. That is, by using a configuration in which 32 GPS satellites that are normally captured, and positioning satellites that are the same number as or a fraction of the 32 satellites are captured in parallel, efficient capturing without waste is achieved. The processing is performed in a short time. Such processing is performed here using a dedicated hardware circuit such as a matched filter (matching filter). In the matched filter, a channel holding the C/A code related to the positioning satellite to be captured is determined, and the received signal and the autocorrelation value are calculated. The C/A code held in each channel can be rewritten and/or switched.

On the other hand, as the positioning satellites related to QZSS (referred to as QZSS satellites), the first unit "Michibiki" is currently in operation, and at least one will remain in the vicinity of Japan's zenith, and about 3 to 6 units. Is expected to be added. In the electronic timepiece 1, the information of the QZSS satellite in operation can be acquired from the outside by the communication unit 63 or the like in advance, and the QZSS satellite set as in operation is to be captured.

Next, a satellite radio wave reception operation of the electronic timepiece 1 will be described.
FIG. 2 is a flowchart showing a control procedure by the control unit 52 of the positioning process executed by the satellite radio wave reception processing unit 50.

This positioning processing is started by the CPU 41 activating the satellite radio wave reception processing unit 50 and acquiring a positioning command.
After performing the initial setting, the control unit 52 activates the receiving unit 51 (step S101). The control unit 52 calls and starts a capture control process that causes the capture unit 511 to perform a capture process for detecting and capturing radio waves from all positioning satellites to be received (step S102). As will be described later, this capture control process operates in parallel with the process of step S103 and thereafter, and ends when a predetermined condition is satisfied.

The control unit 52 determines whether or not the number of satellites captured by the capture processing is greater than 0, that is, whether or not there are captured positioning satellites (step S103). When it is determined that the number of captured satellites is not larger than 0 (no positioning satellite has been captured) (“NO” in step S103), the control unit 52 repeats the process of step S103.

When it is determined that the number of captured satellites is larger than 0 (the positioning satellite is captured) (“YES” in step S103), the radio waves from the captured positioning satellites are tracked to continuously navigate. The tracking unit 512 sequentially starts the operation of acquiring a message (step S104). The control unit 52 determines whether or not necessary data for the number of satellites required for positioning has been acquired (step S105). The number of required satellites is three or four, and here it is determined whether or not date and time (timing) information and position (orbit) information have been acquired from more than this number of positioning satellites. When it is determined that it has not been acquired (“NO” in step S105), the control unit 52 repeats the process of step S105.

When it is determined that all necessary information has been acquired (“YES” in step S105), the control unit 52 performs positioning calculation processing based on the acquired information (step S106). When the positioning result is obtained, the control unit 52 outputs the positioning result to the CPU 41 in a format set in advance such as initial setting (step S107). Then, the control unit 52 ends the positioning process.
In addition, when the maximum operation time is set and the positioning result is not obtained before the maximum operation time elapses, the control unit 52 outputs a positioning failure to the CPU 41 and terminates the positioning process. Is also good.

Next, the control of the capturing process by the capturing unit 511 of the receiving unit 51 will be described.
In the satellite radio wave reception processing unit 50, the capture processing is efficiently performed on at least one cycle (twice for 16 aircraft) for a total of 32 positioning satellites as described above, and a sufficient number of positionings for the positioning calculation processing are performed. It is repeated a plurality of times as necessary until satellites are acquired, and is terminated when a sufficient number of positioning satellites are acquired.
Here, the number of positioning satellites sufficient for the positioning calculation process is set to a number slightly larger than the number of positioning satellites required for the positioning calculation (3 or 4), for example, 6 units. When a larger number of positioning satellites are captured by the capturing process in any cycle, six units are selected based on a predetermined condition, for example, the received signal strength, and the capturing process ends, When the number of captured positioning satellites is less than 6, the capturing process of the next cycle is performed.

In the electronic timepiece 1, in addition to the radio waves transmitted from these 32 GPS satellites (initial setting satellites), the time zone is always based on the setting accepted by the operation accepting unit 61, or the currently set local time zone. Accordingly, it is possible to add the transmission radio waves of the operating QZSS satellite (additional setting satellite) to the capture target.

FIG. 3 is a diagram for explaining the setting of the positioning satellite to be captured in the capture processing in the electronic timepiece 1 of this embodiment.
In the electronic timepiece 1, the capturing process by the C/A code related to the one QZSS satellite in operation is replaced with one of the 32 GPS satellites (Fig. 3(a)) which is initialized for each capturing cycle. To execute. Here, as shown in FIG. 3B, the GPS satellite whose identification code is GPS-01 (ID (identification number) in GPS satellite is 01) is identified as QZS-01 (ID in QZSS satellite is 01). The QZSS satellite is replaced with a GPS satellite, and the acquisition processing is performed for 31 GPS satellites and one QZS satellite.

Regarding the GPS satellites (GPS-01) for which the acquisition processing was not performed, when the sufficient number of satellites for positioning was not acquired by the acquisition processing of 32 aircraft in the first cycle including the QZSS satellite, the acquisition in the second cycle It will be captured in the process. The QZSS satellite (QZS-01) is another GPS satellite, here, as shown in FIG. 3( c ), the identification code is replaced with the GPS satellite of GPS-02 to be captured. Similarly, when the capture processing of the third cycle is performed, the GPS satellite with the identification code GPS-02 is returned to the capture target, and the QZSS satellite (QZS-01) is a different GPS satellite, here, in FIG. As shown in d), the identification code is replaced with the GPS satellite of GPS-03 to be a capture target. That is, the acquisition target may be set so that the same positioning satellite is not excluded from the acquisition target two or more times in a row, and the acquisition target is almost evenly acquired. The GPS satellites are defined in order (predetermined order) from ID=01.

When there are a plurality of QZSS satellites in operation, for example, when three QZSS satellites are in operation, the three QZSS satellites (QZS-01 to QZS-03) are, as shown in FIG. Each is replaced with a GPS satellite (GPS-01 to GPS-03) and included in the capture target. Then, in the capture processing of the second cycle, the three GPS satellites (GPS-01 to GPS-03) replaced in the first cycle are returned to the capture target, and the three QZSS satellites (QZS-01 to QZS-). 03) is replaced with three different GPS satellites, and is captured. Here, as shown in FIG. 3(f), three GPS satellites (GPS-04 to GPS-06) are to be replaced.

When the number of QZSS satellites in operation is not a divisor of the number of GPS satellites (32), as shown in FIG. 3(g), at the 10th cycle (GPS-28 to GPS-30). After being replaced, there will remain two GPS satellites that have never been replaced. After that, when the 11th cycle of the capture processing is performed, returning to FIG. 3E, the GPS satellites whose identification codes are GPS-01 to GPS-03 may be replaced, and FIG. As shown in (h), the remaining two GPS satellites (GPS-31, GPS-32) are replaced with two QZSS satellites (for example, QZS-01, QZS-02) and excluded from being captured. Is also good.

FIG. 4 is a flowchart showing a control procedure by the control unit 52 of the capture control process executed by the satellite radio wave reception processing unit 50 of the electronic timepiece 1 of this embodiment.
The acquisition control process is called and started in a process related to satellite radio wave reception such as the above-described positioning process.

The control unit 52 acquires the number of satellites P0 (integer of 1 or more) of the operating QZSS satellites and their (their) IDs. Further, the control unit 52 sets the number of positioning satellites (QZSS satellites) to be added as a capture target to the number of movable satellites P, and sets the number of movable satellites P to the number of QZSS satellites P0 (step S121). Further, at this time, the control unit 52 acquires the initial setting of the capture target position (that is, the channel number in the matched filter) set for capture of all GPS satellites. The control unit 52 sets "0" to the variable X representing the satellite ID (step S122). In response to this initial setting, the control unit 52 replaces the QZSS satellites of the P machine with the GPS satellites of the P machines of IDs X+1 to X+P and sets them as the capture targets (step S123; capture target replacement step, capture target). Replacement method). That is, if the number of mobile satellites P=1, the one QZSS satellite is replaced with the GPS satellite with the ID X+1, and is captured, and if P=2, the two QZSS satellites have IDs. Are swapped with the GPS satellites of X+1 and X+2, respectively, and are captured, and if P=3, the three QZSS satellites are swapped with the GPS satellites of IDs X+1, X+2, and X+3, respectively, and are captured. It Similarly, in the case of P≧4, the GPS satellites with IDs X+1, X+2,... X+P are replaced with each other to be captured.

The control unit 52 uses the C/A code of each positioning satellite for the positioning satellites set as the capture target, that is, the QZSS satellites of P machines and the GPS satellites of (32-P) machines, to perform the capture processing by the capturing unit 511. Is performed (step S124). Here, the control unit 52 sequentially performs the capture processing of 32 aircraft by dividing the aircraft into 16 aircraft twice each.

The control unit 52 determines whether or not the number of satellites captured by the capture processing has become a reference number, here 6 or more (step S125). When it is determined that the number is equal to or larger than the reference number (“YES” in step S125), the control unit 52 ends the capture control process.

When it is determined that the number of captured satellites is not equal to or larger than the reference number (“NO” in step S125), the control unit 52 adds the number of operating movable satellites P to the variable X (step S126). The control unit 52 determines whether or not the value of the new variable X is larger than (32-P) (step S127), and when it is determined that the value is not larger (“NO” in step S127), the process is performed. Return to step S123. When it is determined that it is larger (“YES” in step S127), the control unit 52 returns the process to step S122.

Next, a modified example of the capture control process will be described.
[Modification 1]
In the acquisition control process of the first modification, it is determined whether or not the reception range of the transmission radio wave of the QZSS satellite is out of the reception range based on the user setting, the time zone setting (predetermined information related to the reception possibility), and the like. If it is determined that the QZSS satellite acquisition processing is not performed.

FIG. 5 is a flowchart showing a control procedure by the control unit 52 of the first modification of the capture control process.
The capture control process is the same as the capture process of the above-described embodiment except that the processes of steps S141 and S142 are added, and the same process content is denoted by the same reference numeral and its description is omitted. To do.

Following the processing of step S121, the control unit 52 determines whether or not the setting is out of the reception range of the QZSS satellite (step S141). If it is determined that it is not out of the reception area, that is, it is within the reception area, is not set whether it is out of the reception area, or whether it is not clear whether it has moved out of the reception area after the setting. (“NO” in step S141), the process of the control unit 52 proceeds to step S122. When it is determined that the setting is out of the reception range (“YES” in step S141), the control unit 52 changes the set number P to “0” (step S142). Then, the process of the control unit 52 moves to step S122.

[Modification 2]
In the acquisition control process of the second modification, the positioning satellites acquired in each cycle are excluded from the acquisition target, and when the GPS satellites, that is, the positioning satellites whose initial position related to the acquisition process is determined, are acquired, By filling the position with the positioning satellite that has moved the set position every cycle, that is, the QZSS satellite, the moving setting of the QZSS satellite is reduced and eliminated.
FIG. 6 is a diagram illustrating setting of a positioning satellite to be captured in the modification 2 of the capture control process. Here, a case where two QZSS satellites are in operation will be described as an example.

As shown in FIG. 6A, in the first cycle, the QZSS satellites having the identification codes QZS-01 and QZS-02 are captured instead of the GPS satellites having the identification codes GPS-01 and GPS-02. When a GPS satellite of GPS-05 is acquired in the process, in the acquisition process of the second and subsequent cycles, as shown in FIG. 6B, any QZSS satellite is set as the acquisition target instead of the GPS-05. You can replace it as you would. IDs of the QZSS satellites to be replaced may be determined in order from 01, or the QZSS satellites originally supposed to be replaced with the GPS satellites of this GPS-05 (here, since it is an odd number, the QZSS-01 QZSS satellite).

If more positioning satellites than the number of QZSS satellites to be captured are captured, here, if the GPS satellite (GSP-01) is captured in the capture processing of the second cycle, as shown in FIG. By replacing the positioning satellite with the QZSS satellite (here, QZS-02), it is not necessary to replace the QZSS satellite with another GPS satellite in the subsequent acquisition processing.

Further, as shown in FIG. 6D, when the replaced QZSS satellite is captured, the QZSS satellite is excluded from the subsequent capture processing. Here, when the QZSS satellite whose identification code is QZS-02 is captured in the capture processing of the first cycle, the QZSS satellite whose identification code is QZS-01 is displayed in the second cycle and thereafter, as shown in FIG. 6(e). Only those IDs are sequentially replaced with GPS satellites whose ID is “03” or later and are captured. In this case, the GPS satellite for which the identification code QZS-01 is to be replaced is only the GPS satellite that was originally scheduled to be replaced with this QZSS satellite (QZS-01) (here, the GPS satellite with an odd number ID). Alternatively, all GPS satellites may be replaced in order.

The acquisition processing of the QZSS satellites replaced (fixed position) with the acquired GPS satellites is performed in the same order as the original GPS satellites by the QZSS satellites that have not been replaced (fixed position). The QZSS satellite may be skipped and the replacement may not be performed. That is, when the GPS satellite (GPS-01) is not captured in FIG. 6B, the QZSS satellite (QZS-02) is replaced with the GPS satellite (GPS-04) in the third cycle and the capture processing is performed. In the fourth cycle after being read, it may be replaced with the QZSS satellite (QZS-01) or may be skipped and replaced with the GPS satellite (GPS-06).

When all the QZSS satellites to be captured have been captured, it is not necessary to capture the QZSS satellites in the subsequent capture processing. Therefore, as shown in FIG. 6(f), all GPS satellites are not replaced. Then, it is targeted for capture.

FIG. 7 is a flowchart showing a control procedure by the control unit 52 of the second modification of the capture control process.
The capture control process is different from the capture control process of the above-described embodiment in that the processes of steps S131 to S138 are added. The other processing is the same, and the same processing contents are designated by the same reference numerals and detailed description thereof is omitted.

When it is determined that the total number of positioning satellites captured in the determination process of step S125 is not equal to or greater than the reference number (here, six) (“NO” in step S125), the control unit 52 determines all capture targets. It is determined whether or not the positioning satellite is already fixed (that is, whether P=0) (step S131). If it is determined that it is fixed (P=0) (“YES” in step S131), the process of the control unit 52 returns to step S124.

When it is determined that the positioning satellite to be captured is not already fixed (“NO” in step S131), the control unit 52 performs the process in step S138 among the positioning satellites captured in the most recent process in step S124. It is determined whether or not the number of QZSS satellites (hereinafter referred to as movable QZSS satellites) whose set positions are not fixed is equal to the number P of movable satellites (step S132). When it is determined that they are equal (“YES” in step S132), the control unit 52 fixes the setting as all the remaining positioning satellites to be captured (step S133). Then, the process of the control unit 52 returns to step S124.

When it is determined that the number of captured mobile QZSS satellites and the number of mobile satellites P are not equal (“NO” in step S132), the control unit 52 determines the mobile QZSS satellites currently captured from the number of mobile satellites P. Is subtracted (step S134). The control unit 52 determines whether or not the number of GPS satellites among the positioning satellites captured in the most recent step S124 is greater than 0, that is, whether or not GPS satellites have been captured (step S135). When it is determined that the value is not greater than 0, that is, the GPS satellite is not captured (“NO” in step S135), the process of the control unit 52 proceeds to step S126.

When it is determined that the number of captured GPS satellites is greater than 0, that is, the GPS satellites have been captured (“YES” in step S135), the control unit 52 determines that the number of captured GPS satellites is a movable satellite. It is determined whether the number is P or more (step S136). When it is determined that the number of movable satellites is P or more (“YES” in step S136), the control unit 52 sets the remaining movable QZSS satellites as the capture targets at the initial setting position of the captured GPS satellites. Then, the setting is fixed (step S137). Then, the process of the control unit 52 returns to step S124.

When it is determined that the number is not more than the number of movable satellites P (“NO” in step S136), the control unit 52 captures a part of the remaining movable QZSS satellites at the initial setting position of the captured GPS satellites. Set as. The control unit 52 subtracts the set number of QZSS satellites from the number P of movable satellites (step S138). Then, the processing of the control unit 52 moves to step S126.

As described above, in the process of step S123, if any of the GPS satellites with IDs X+1 to X+P has been captured and replaced with another QZSS satellite, that QZSS satellite is excluded as described above. If not, the ID of the replacement target is shifted backward by the number of the replaced QZSS satellites. In this case, in the processing of step S126, the shifted number is further added to the variable X.

As described above, the satellite radio wave reception processing unit 50 of the present embodiment includes the reception unit 51 that captures and receives the transmission radio wave of at least one of the plurality of positioning satellites, and the control unit 52, and controls In the capturing operation by the receiving unit 51, the unit 52 is an additional setting satellite other than the initial setting satellite, of which some of the transmitting radio waves of the 32 GPS satellites, which are the initial setting satellites predetermined as the capturing target, are transmitted. When the capturing operation is performed by replacing the transmission radio wave of the QZSS satellite with the capturing target and performing the capturing operation a plurality of times, a part of the transmission radio waves exchanged for each capturing operation is changed.
As a result, it is possible to capture the transmission radio waves of the added positioning satellites such as the QZSS satellites in a well-balanced manner by the same processing as when capturing only the transmission radio waves of the GPS satellites without changing the capture time. Therefore, the satellite radio wave reception processing unit 50 can easily and efficiently capture and receive radio waves from an appropriate positioning satellite.

Further, the receiving unit 51 includes a matched filter that performs a capturing operation in which transmission waves of a predetermined number of 2 or more, for example, 16 positioning satellites are captured in parallel. In such a case, in particular, the channel for performing the capturing operation of the matched filter can be effectively utilized without wasting, and the capturing time including the QZSS satellite can be simply and efficiently performed without unnecessarily extending the capturing time. By doing so, it is possible to capture the radio waves from the positioning satellites in good balance.

Further, in the receiving unit 51, the number of radio waves to be captured by the matched filter in parallel is the same as or a divisor of the number of initial setting satellites. As a result, it is possible to efficiently capture electric waves in a short time without generating a vacant channel of the matched filter and suppressing power consumption. Then, in the case where an additional setting satellite is included in the capturing target of such a receiving unit 51, the additional setting satellite is not simply added to perform the capturing operation, but the capturing operation is performed by replacing the initial setting satellite. By doing so, it is possible to capture the radio waves from an appropriate positioning satellite without lowering the efficiency.

Further, the control unit 52 determines a part of the transmission radio waves to be replaced in a predetermined order. This makes it possible to easily and evenly perform the setting and processing of the receiving unit 51 (matched filter) related to the replacement.

Further, the control unit 52 replaces the transmission radio wave of the additional setting satellite with the transmission radio wave of the initial setting satellite based on the predetermined information on the reception possibility of the transmission radio wave of the additional setting satellite (QZSS satellite), and acquires the capture target. Whether to include in. That is, when the receivable area is limited like the positioning satellite related to the regional positioning system and it is possible to determine whether or not the current position is in the vicinity of the receivable area, the additional setting satellite Since the initial setting satellites are not replaced and the transmission radio waves of the additional setting satellites are not captured, wasteful capturing operations are not increased, and the initial satellites such as GPS satellites can be captured properly and easily and efficiently as usual. You can do it.

In addition, when at least a part of the transmitted radio waves of the initial setting satellite that is the capture target is captured, the control unit 52 captures the transmitted radio waves of the additional setting satellites of the same number or less as the captured transmitted radio waves. The target is to be captured by replacing it with the transmitted radio wave.
As a result, it becomes possible to perform the capturing operation every time while removing the replaced additional setting satellite from the replacement target in the subsequent capturing operation. Therefore, it is possible to easily continue the capturing operation of the positioning satellite that has not been captured efficiently.

In addition, when a part of the transmission radio waves of the additional setting satellite is captured, the control unit 52 does not capture the captured transmission radio waves in the subsequent capturing operation. As a result, the replacement operation amount can be reduced, and the initial setting satellite (GPS satellite) that has not been captured yet can be excluded from the capture target as much as possible to improve the efficiency of the capture operation.

Further, the initial setting satellite is a predetermined satellite positioning system for the entire earth, here, a positioning satellite related to GPS, and the additional setting satellite is a regional positioning system that complements the satellite positioning system, here, Japan. It is a positioning satellite related to QZSS. In this way, the positioning satellites that are usually always captured are used as the initial setting satellites, while the positioning satellites related to a limited number of positioning systems that are limited in number depending on the current position, user settings, etc. are additionally set initial setting satellites. By replacing the target radio waves with the target radio waves, it is possible to capture the transmission radio waves of the positioning satellite capable of receiving the transmission radio waves in good balance while maintaining the efficiency of the capturing operation.

The electronic timepiece 1 of the present embodiment also includes the satellite radio wave reception processing unit 50 described above, the time counting circuit 48 that counts the current time, and the display unit 62 that displays the current time based on the time counted by the time counting circuit 48. And As a result, the electronic timepiece 1 acquires the date and time information easily and efficiently and reflects it on the clock circuit 48 without increasing the power consumption and the time required for positioning and acquisition of the current date and time, and uses the accurate current date and time. Can be displayed.

Further, in the satellite radio wave capturing control method by the satellite radio wave reception processing unit 50, the radio wave from an appropriate positioning satellite can be simply and easily received, particularly when the positioning satellites related to a plurality of positioning systems are selected and captured to receive data. Can be efficiently captured and received.

In addition, by installing and using a program for executing the control processing related to the satellite radio wave acquisition control method in an electronic device such as the electronic timepiece 1, the satellite radio wave reception control can be performed easily and appropriately by software, and efficiency can be improved. It is possible to capture the transmitted radio waves of a good positioning satellite.

The present invention is not limited to the above embodiment, and various modifications can be made.
For example, in the above-described embodiment, the radio waves of 16 positioning satellites can be captured in parallel, but the present invention is not limited to this. Eight machines may be used, or all 32 machines may be able to simultaneously capture in parallel. On the contrary, the radio waves of the positioning satellites may be sequentially captured one by one. Also, it does not exclude the case where a configuration of 10 machines other than a divisor of 32 is used. In such a case, two of the QZSS satellites may be added to the initial setting satellites from the beginning, and only the remaining QZSS satellites may be set as the movable QZSS satellites to be captured while being replaced with the initial setting satellites.

Further, in the above-described embodiment, the replacement target is from GPS-01 in ascending order of GPS satellite ID, but the present invention is not limited to this. Other orders may be used, or random orders may be used as long as the replacement process is not complicated.

Further, in the above-described embodiment, the case where GPS is mainly used as a complement of positioning satellites related to Japanese QZSS has been described as an example, but the present invention is not limited to this. In particular, the present invention can be effectively applied when the global satellite positioning system and the regional positioning system in which the same kind of pseudo-random noise is used at the same transmission frequency are used in combination.

Further, the positioning satellites related to the regional positioning system are not limited to the quasi-zenith satellites, and may include positioning satellites that stay in the sky above a limited area, such as geostationary satellites.

Further, in the above-described embodiment, the operation information of the QZSS satellite is acquired from the outside by using Bluetooth, but other communication means may be used, and the communication means of the communication unit 63 included in the electronic timepiece 1 is as follows. It is not limited to wireless communication. Further, the user may perform an input operation via the operation reception unit 61 to set the operation information.

Further, in the above description, the storage unit 53 formed of a non-volatile memory is taken as an example as the computer-readable medium of the program 532 of the operation processing such as the capture control processing related to the processing operation of the control unit 52 according to the present invention. However, it is not limited to this. As another computer-readable medium, a hard disk drive (HDD) or a portable recording medium such as a CD-ROM or a DVD disk can be applied. A carrier wave is also applied to the present invention as a medium for providing the data of the program according to the present invention via a communication line.
In addition, the specific details such as the configuration, the control content, and the procedure described in the above embodiment can be appropriately changed without departing from the spirit of the present invention.

Although some embodiments of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments and includes the scope of the invention described in the claims and the equivalent scope thereof.
The inventions described in the scope of the claims attached first to the application for this application will be additionally described below. The claim numbers listed in the appendices are as set forth in the claims originally attached to the application for this application.

[Appendix]
<Claim 1>
A reception processing unit that captures and receives at least one of the transmitted radio waves from a plurality of satellites;
A control unit,
Equipped with
In the capturing operation by the reception processing unit, the control unit replaces a part of the transmission radio waves of the preset initialization satellite as a capture target with the transmission radio waves of the additional setting satellites other than the initialization satellite. The satellite radio wave receiving device characterized in that, when the capturing operation is performed for the capturing target and the capturing operation is performed a plurality of times, the part of the transmission radio waves to be exchanged is changed for each capturing operation. ..
<Claim 2>
The satellite radio wave receiving apparatus according to claim 1, wherein the reception processing unit performs a capturing operation in which transmission radio waves of a predetermined number of two or more satellites are captured in parallel.
<Claim 3>
3. The satellite radio wave receiving apparatus according to claim 2, wherein the reception processing unit is configured such that the predetermined number is equal to or a divisor of the number of the initial setting satellites.
<Claim 4>
The satellite radio wave receiving apparatus according to claim 1, wherein the control unit determines the part of the transmission radio waves to be replaced in a predetermined order.
<Claim 5>
Whether the control unit replaces the transmission radio wave of the additional setting satellite with the transmission radio wave of the initial setting satellite and includes it in the capture target based on predetermined information on the receivability of the transmission radio wave of the additional setting satellite. The satellite radio receiver according to any one of claims 1 to 4, wherein:
<Claim 6>
When at least a part of the transmission radio waves of the initial setting satellite that is the capture target is captured, the control unit sets the transmission radio waves of the additional setting satellite equal to or less than the number of captured transmission radio waves. The satellite radio wave receiver according to claim 1, wherein the satellite radio wave reception device replaces the captured transmission radio wave and sets it as the capture target.
<Claim 7>
The control unit does not set the captured transmission radio waves in the subsequent capturing operation as the capture target when a part of the transmission radio waves of the additional setting satellite is captured. 7. The satellite radio wave receiving device according to any one of items 6 to 6.
<Claim 8>
The initial setting satellite is a positioning satellite related to a predetermined satellite positioning system for the entire earth, and the additional setting satellite is a positioning satellite related to a regional positioning system that complements the satellite positioning system. The satellite radio wave receiver according to any one of claims 1 to 7.
<Claim 9>
A satellite radio wave receiving device according to any one of claims 1 to 8,
A timekeeping unit that counts the current time,
A display unit for displaying the current time based on the time counted by the timer unit,
An electronic timepiece comprising:
<Claim 10>
A satellite radio wave capturing control method for a satellite radio wave receiving device comprising a reception processing unit that captures and receives at least one of transmission radio waves from a plurality of satellites,
In the capture operation by the reception processing unit, a part of the transmission radio waves of the initialization satellite that is predetermined as a capture target is replaced with the transmission radio waves of additional setting satellites other than the initialization satellite and included in the capture target. In the case of performing the capturing operation by performing the capturing operation and performing the capturing operation a plurality of times, a satellite radio wave capturing step is included, which includes a capturing target replacement step of changing the part of the transmitted radio waves that is switched for each capturing operation. Control method.
<Claim 11>
A computer of a satellite radio wave reception device including a reception processing unit that captures and receives at least one transmission radio wave of a plurality of satellites,
In the capture operation by the reception processing unit, a part of the transmission radio waves of the initialization satellite that is predetermined as a capture target is replaced with the transmission radio waves of additional setting satellites other than the initialization satellite and included in the capture target. A program for causing the capturing operation to be performed, and causing the capturing operation to be performed a plurality of times, to function as capture target replacement means for changing the part of the transmission radio waves to be replaced for each capture operation.

1 Electronic clock 40 Microcomputer 41 CPU
42 ROM
421 program 43 RAM
431 Local time setting storage unit 46 Oscillation circuit 47 Dividing circuit 48 Timing circuit 50 Satellite radio wave reception processing unit 51 Reception unit 511 Capture unit 512 Tracking unit 52 Control unit 53 Storage unit 531 Reception control information 532 Program 61 Operation reception unit 62 Display unit 63 communication unit 70 power supply unit 71 battery A1 antenna A2 antenna

Claims (11)

A reception processing unit that captures and receives at least one of the transmitted radio waves from a plurality of satellites;
A control unit,
Equipped with
In the capturing operation by the reception processing unit, the control unit replaces a part of the transmission radio waves of the preset initialization satellite as a capture target with the transmission radio waves of the additional setting satellites other than the initialization satellite. The satellite radio wave receiving device characterized in that, when the capturing operation is performed for the capturing target and the capturing operation is performed a plurality of times, the part of the transmission radio waves to be exchanged is changed for each capturing operation. .. The satellite radio wave receiving apparatus according to claim 1, wherein the reception processing unit performs a capturing operation in which transmission radio waves of a predetermined number of two or more satellites are captured in parallel. 3. The satellite radio wave receiving apparatus according to claim 2, wherein the reception processing unit is configured such that the predetermined number is equal to or a divisor of the number of the initial setting satellites. The satellite radio wave receiving apparatus according to claim 1, wherein the control unit determines the part of the transmission radio waves to be replaced in a predetermined order. Whether the control unit replaces the transmission radio wave of the additional setting satellite with the transmission radio wave of the initial setting satellite and includes it in the capture target based on predetermined information on the receivability of the transmission radio wave of the additional setting satellite. The satellite radio receiver according to any one of claims 1 to 4, wherein: When at least a part of the transmission radio waves of the initial setting satellite that is the capturing target is captured, the control unit sets the transmission radio waves of the additional setting satellites equal to or less than the number of captured transmission radio waves. The satellite radio wave reception device according to claim 1, wherein the satellite radio wave reception device replaces the captured transmission radio wave and sets it as the capture target. The control unit does not set the captured transmission radio waves in the subsequent capturing operation as the capture target when a part of the transmission radio waves of the additional setting satellite is captured. 7. The satellite radio wave receiving device according to any one of items 6 to 6. The initial setting satellite is a positioning satellite related to a predetermined satellite positioning system for the entire earth, and the additional setting satellite is a positioning satellite related to a regional positioning system that complements the satellite positioning system. The satellite radio wave receiver according to any one of claims 1 to 7. A satellite radio receiver according to any one of claims 1 to 8,
A timekeeping unit that counts the current time,
A display unit for displaying the current time based on the time counted by the timer unit,
An electronic timepiece comprising: A satellite radio wave capturing control method for a satellite radio wave receiving device comprising a reception processing unit that captures and receives at least one of transmission radio waves from a plurality of satellites,
In the capture operation by the reception processing unit, a part of the transmission radio waves of the initialization satellite that is predetermined as the capture target is replaced with the transmission radio waves of the additional setting satellites other than the initialization satellite and included in the capture target. When the capturing operation is performed by performing the capturing operation and the capturing operation is performed a plurality of times, the capturing method includes a capturing target replacement step of changing the part of the transmitted radio waves that is switched for each capturing operation. Control method. A computer of a satellite radio wave reception device including a reception processing unit that captures and receives at least one transmission radio wave of a plurality of satellites,
In the capture operation by the reception processing unit, a part of the transmission radio waves of the initialization satellite that is predetermined as the capture target is replaced with the transmission radio waves of the additional setting satellites other than the initialization satellite and included in the capture target. When the capturing operation is performed by performing the capturing operation a plurality of times and the capturing operation is performed a plurality of times, the program causes the capturing target exchanging unit that changes the part of the transmitted radio waves to be exchanged for each capturing operation.

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