JP2018031687A - Satellite radio wave receiver, electronic clock, satellite radio wave capture control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a satellite radio wave receiver, electronic clock, satellite radio wave capture control method, and program capable of easily and efficiently capturing and receiving radio waves from an appropriate positioning satellite.SOLUTION: The satellite radio wave receiver includes: a reception processing unit for capturing and receiving a transmitted radio wave from at least any one of a plurality of satellites; and a control unit. In a capturing operation by the reception processing unit, the control unit replaces a partial transmitted radio wave, of the transmitted radio waves from a previously determined initial setting satellite as a capturing object, with a transmitted radio wave of an additional setting satellite other than the initial setting satellite, takes it as the capturing object, and causes the capturing operation to be executed. When a plurality of capturing operations are executed, the partial transmitted radio wave replaced for each capturing operation is changed.SELECTED DRAWING: Figure 4

Description

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

  Conventionally, there is a technique for receiving radio waves from a positioning satellite according to GNSS (Global Navigation Satellite System) and acquiring accurate date and time information and current position information. Radio waves from positioning satellites can be received from anywhere in the world as long as the sky is 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 who travel around the world.

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

  In the acquisition operation of positioning satellites including complementary satellites whose receivability varies depending on the region, if the order of acquiring such complementary satellites is fixed, the complementary satellites may or may not be used. In either case, there is a problem that the time required for the capturing operation becomes unnecessarily long. 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 and the like.

Japanese Patent Laying-Open No. 2006-31232

  However, if you select the positioning satellites that are to be captured, including complementary satellites, and receive them with appropriate conditions such as reception intensity, etc., once the number of positioning satellites to be captured varies depending on the situation, There is a problem in that the time required for the perception capture operation changes, and as a result, the reception operation may take more time than necessary, or it may take time and the efficiency of the operation related to capture may be reduced.

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

In order to achieve the above object, the present invention provides:
A reception processing unit that captures and receives at least one transmission radio wave among a plurality of satellites;
A control unit;
With
In the capturing operation by the reception processing unit, the control unit replaces some of the transmission radio waves of the initial setting satellites that are predetermined as acquisition targets with the transmission radio waves of the additional setting satellites other than the initial setting satellites. A satellite radio wave receiving device characterized in that, when the capture operation is included in the capture target and the capture operation is performed a plurality of times, the part of the transmission radio waves replaced for each capture operation is changed. It is.

  According to the present invention, the satellite radio wave receiving apparatus has an effect that radio waves from an appropriate positioning satellite can be easily captured and received efficiently.

It is a block diagram which shows the function structure of the electronic timepiece of this embodiment. It is a flowchart which shows the control procedure of the positioning process performed in a satellite radio wave reception process part. It is a figure explaining the setting of the positioning satellite of the acquisition object in the acquisition process in an electronic timepiece. It is a flowchart which shows the control procedure of the acquisition control process performed in a satellite radio wave reception process part. It is a flowchart which shows the control procedure of the modification 1 of an acquisition control process. It is a figure explaining the setting of the positioning positioning positioning satellite in the modification 2 of an acquisition control process. It is a flowchart which shows the control procedure of the modification 2 of an acquisition control process.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a functional configuration of an electronic timepiece 1 including a satellite radio wave receiver of this embodiment.

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

  The microcomputer 40 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 time measuring circuit 48 (time measuring unit), 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. The ROM 42 may include a non-volatile memory such as a flash memory capable of rewriting and updating data in addition to the mask ROM. The RAM 43 provides a working memory space to the CPU 41 and stores temporary data. The RAM 43 has a local time setting storage unit 431 for storing the time zone setting and daylight saving time setting when displaying and using the current date and time.

  The oscillation circuit 46 generates and outputs a signal having a predetermined frequency. For example, a crystal oscillator 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-divided signal obtained by frequency-dividing the frequency signal input from the oscillation circuit 46 by a set frequency dividing ratio. The setting of the frequency division ratio may be changed by the CPU 41.
The timer circuit 48 holds the current date and time by counting a frequency-divided signal having 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 transmission radio wave from a positioning satellite of a satellite positioning system such as GPS (Global Positioning System) in the United States, acquires date 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, a tracking unit 512, and the like. The capturing unit 511 performs a capturing process of detecting radio waves from a positioning satellite (satellite) to be received and identifying the positioning satellite and identifying the phase of the transmission signal. Although the capture process will be described in detail later, the satellite radio wave reception processing unit 50 of the electronic timepiece 1 of the present embodiment has a configuration capable of processing to capture transmission radio waves from a plurality of positioning satellites in parallel.

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

  The control unit 52 acquires necessary information based on the extracted signal, and performs identification of the current date and time and calculation of the current position (that is, positioning). The control unit 52 obtains at least a part necessary for obtaining desired information from transmission information from each positioning satellite based on the format of the navigation message of each positioning satellite that can be received. From the GPS positioning satellite (hereinafter referred to as GPS satellite) (L1 band), date and time information (when the date can be identified from the date and time counted by the clock circuit 48, at least the weekly elapsed time (TOW) -Count)), its reception timing, and orbit information of each captured GPS satellite. The current position can be calculated based on the orbit information of each GPS satellite and the current date and time timing difference obtained from the GPS satellite. Further, the accuracy of the identified date and time is determined by the distance between each GPS satellite and the current position. The delay time from the correct date and time is obtained.

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

  The operation accepting unit 61 accepts an external input operation such as a user operation. The operation receiving unit 61 includes, for example, one or a plurality of push button switches, and outputs a signal corresponding to the pressing operation of the push button switch to the CPU 41.

  The display unit 62 displays various information based on the control of the CPU 41. The display unit 62 includes a display screen and a driving circuit thereof. 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 on the liquid crystal display screen. The contents displayed on the display unit 62 include information relating to the current date and time.

  The communication unit 63 performs short-range wireless communication with an external electronic device via the antenna A <b> 2 based on the control of the CPU 41. An example of the short-range wireless communication is Bluetooth communication (registered trademark: Bluetooth). Examples of external electronic devices include the same user's smartphone, mobile phone, and various portable electronic terminals. The communication unit 63 can acquire the operation information of the positioning satellite from a predetermined server via the electronic device of the communication connection partner.

  The power supply unit 70 supplies power required for the operation of each unit of the electronic timepiece 1 to each 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 varies depending on the operating part, the power supply unit 70 performs voltage conversion using a regulator and outputs the result. 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 such as a dry battery or a rechargeable battery.

Next, transmission radio waves from the positioning satellite will be described.
Each positioning satellite transmits a signal (navigation message) in which transmission information is encoded in a format corresponding to the positioning system to which the positioning satellite belongs, by spreading the spectrum with a pseudo-random code sequence (pseudo-random noise; PRN) that is different for each positioning satellite. ing. The C / A code, which is a pseudo-random code sequence that is open to the general public, is GPS (Global Positioning System) and the Japanese Quasi-Zenith Satellite System (QZSS) that complements this. In the Quasi-Zenith Satellites System, etc., there are 1023 code arrays, and this code array is repeatedly used at a cycle of 1 msec (1.023 MHz). In this radio wave receiving apparatus, that is, the electronic timepiece 1, a signal including a navigation message is detected and demodulated by despreading the received radio wave using the C / A code.

  When the receivable positioning satellites are not known, the receiving apparatus applies the C / A codes of all positioning satellites to the received radio waves at all phases and calculates the autocorrelation to detect the signals. / A code type (PRN number) and a capturing process for identifying the phase at the time of reception are performed. Usually, 32 positioning satellites are operated in the GPS, and the electronic timepiece 1 has a plurality of (two or more predetermined number) positioning satellites, here 16 satellites, as the capturing unit 511 of the satellite radio wave reception processing unit 50. The C / A code is applied to the received radio waves in parallel, that is, the transmission radio waves of 16 positioning satellites are captured in parallel, and the processing (capture operation) is performed twice, so that the efficiency is reduced in a short time. In particular, it has a configuration that makes it possible to perform capture processing on radio waves from 32 positioning satellites. In other words, for the 32 GPS satellites that are normally captured, a configuration that allows the number of positioning satellites of the same number or its divisor to be captured in parallel can be used for efficient capture without waste. Processing is performed in a short time. Here, such processing is performed using a dedicated hardware circuit such as a matched filter (matched filter). In the matched filter, a channel for 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 positioning satellites related to QZSS (referred to as QZSS satellites), the first unit “MICHIBIKI” is currently in operation, and in the future, at least one of them will be around 3-6 in the vicinity of the zenith in Japan. It is assumed that the operation will be added. In the electronic timepiece 1, it is possible to acquire information on the QZSS satellite in operation from the outside in advance by the communication unit 63 or the like, and the QZSS satellite set as being in operation is targeted for acquisition.

Next, the satellite radio wave receiving operation in 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 process is started when the CPU 41 activates the satellite radio wave reception processing unit 50 and acquires a positioning command.
After performing the initial setting, the control unit 52 activates the reception 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 processes after step S103, and ends at a timing when a predetermined condition is satisfied.

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

  If it is determined that the number of captured satellites is greater than 0 (positioning satellites are captured) (“YES” in step S103), the navigation is continuously performed by tracking radio waves from the captured positioning satellites. The operation of acquiring messages is sequentially started by the tracking unit 512 (step S104). The controller 52 determines whether or not necessary data for the number of satellites necessary for positioning has been acquired (step S105). The number of necessary satellites is three or four. Here, it is determined whether date / time (timing) information and position (orbit) information have been acquired from positioning satellites greater than this number. If it is determined that it has not been acquired (“NO” in step S105), the control unit 52 repeats the process of step S105.

If 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 by initial setting or the like (step S107). And the control part 52 complete | finishes a positioning process.
When the maximum operation time is set and the positioning result cannot be obtained until the maximum operation time elapses, the control unit 52 outputs the positioning failure to the CPU 41 and ends the positioning process. Also good.

Next, control of capture processing by the capture unit 511 of the reception unit 51 will be described.
In the satellite radio wave reception processing unit 50, as described above, the acquisition process is efficiently performed for at least one period (twice each 16 units) for a total of 32 positioning satellites, and a sufficient number of positioning calculation processes are performed. Repeated as many times as necessary until the satellites are acquired, and the process ends when a sufficient number of positioning satellites have been acquired.
Here, the number of positioning satellites sufficient for the positioning calculation processing is determined to be slightly larger than the number of positioning satellites necessary for the positioning calculation (three or four), for example, six. If more positioning satellites are acquired in the acquisition process in any period, 6 units are selected based on a predetermined condition, for example, the received radio wave intensity, and the acquisition process ends. If the number of positioning satellites that have been captured is less than six, acquisition processing for the next cycle is performed.

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

FIG. 3 is a diagram illustrating the setting of the positioning target positioning satellite in the capturing process in the electronic timepiece 1 of the present embodiment.
In the electronic timepiece 1, the C / A code acquisition process for one QZSS satellite in operation is replaced with one of the 32 GPS satellites (FIG. 3A) initially set for each acquisition period. And execute. Here, as shown in FIG. 3B, a GPS satellite having an identification code of GPS-01 (ID (identification number) of GPS satellite is 01), an identification code of QZS-01 (ID of QZSS satellite is 01). The QZSS satellite is replaced, and the acquisition process for 31 GPS satellites and one QZS satellite is performed.

  For GPS satellites (GPS-01) that have not been acquired, if the number of satellites sufficient for positioning was not acquired by the acquisition of 32 aircraft in the first cycle including the QZSS satellite, It is captured by the process. The QZSS satellite (QZS-01) is replaced with another GPS satellite, in this case, as shown in FIG. Similarly, when the acquisition process in the third period is performed, GPS satellites having an identification code of GPS-02 are returned to the acquisition target, and the QZSS satellite (QZS-01) is a further different GPS satellite, here FIG. As shown in d), the identification code is replaced with a GPS satellite of GPS-03 to be captured. In other words, it is only necessary to set the capture target so that the same positioning satellite is not excluded from the capture target for two or more times in succession, and so that it is almost uniformly captured. The GPS satellites are determined in order (predetermined order) from ID = 01.

  When there are a plurality of operating QZSS satellites, for example, when three QZSS satellites are operating, 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. In the acquisition process in the second period, the three GPS satellites (GPS-01 to GPS-03) replaced in the first period return to the acquisition target, and the three QZSS satellites (QZS-01 to QZS-). 03) is replaced with three different GPS satellites to be captured. Here, as shown in FIG. 3 (f), three GPS satellites (GPS-04 to GPS-06) are targeted for replacement.

  If the number of QZSS satellites in operation is not a divisor of the number of GPS satellites (32), as shown in FIG. 3 (g), the 10th period (GPS-28 to GPS-30) After the replacement, two GPS satellites that have never been replaced remain. After this, when the eleventh cycle capture process is performed, returning to FIG. 3E, GPS satellites having the identification codes GPS-01 to GPS-03 may be replaced, or FIG. h), the remaining two GPS satellites (GPS-31, GPS-32) are replaced with two QZSS satellites (eg, QZS-01, QZS-02) and excluded from the capture target. Also good.

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

  The control unit 52 acquires the number P0 (an integer of 1 or more) of the QZSS satellites in operation and their (their) IDs. Further, the control unit 52 sets the number of positioning satellites (QZSS satellites) to be added as acquisition targets as the number P of movable satellites, and sets the number of movable satellites P to the number of movable satellites P0 (step S121). 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 capturing 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 sets the P aircraft QZSS satellites as the capture targets by replacing the P GPS satellites with IDs X + 1 to X + P respectively (step S123; capture target replacement step, capture target). Replacement means). That is, if the number of movable satellites P = 1, the one QZSS satellite is replaced with a GPS satellite whose ID is X + 1, and if P = 2, the two QZSS satellites are ID Are replaced with GPS satellites of X + 1 and X + 2, respectively, and if P = 3, the three QZSS satellites are replaced with GPS satellites with IDs of X + 1, X + 2 and X + 3, respectively. The Similarly, when P ≧ 4, the GPS satellites whose IDs are X + 1, X + 2,.

  The control unit 52 captures the positioning satellites set as capture targets, that is, the P-unit QZSS satellite and the (32-P) -unit GPS satellite by the capture unit 511 with the C / A codes of the respective positioning satellites. (Step S124). Here, the control unit 52 performs the capturing process for a total of 32 machines by dividing the 16 machines twice in order.

  The control unit 52 determines whether or not the number of satellites acquired in the acquisition process has become the reference number, here, six or more (step S125). When it is determined that the number is equal to or greater 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 greater than the reference number (“NO” in step S125), the control unit 52 adds the number of movable satellites P in operation to the variable X (step S126). The control unit 52 determines whether or not the value of the new variable X is greater than (32-P) (step S127). If it is determined that the value is not larger (“NO” in step S127), the control unit 52 performs the process. It returns to step S123. If it is determined that the value 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 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 reception possibility), and the like. When it is determined that the QZSS satellite is not captured, the switching is performed.

FIG. 5 is a flowchart illustrating a control procedure performed by the control unit 52 according to the first modification of the capture control process.
This capture control process is the same as the capture process of the above embodiment except that the processes of steps S141 and S142 are added, and the same process contents are denoted by the same reference numerals and description thereof is omitted. To do.

  Following the processing of step S121, the control unit 52 determines whether or not the setting is made that the QZSS satellite is out of the reception range (step S141). When it is determined that it is not out of the reception area, that is, whether it is within the reception area, whether it is out of the reception area, or whether it has moved outside the reception area after the setting is not clear. ("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 proceeds to step S122.

[Modification 2]
In the acquisition control process of the modified example 2, when the positioning satellites acquired in each cycle are excluded from the acquisition targets, and the GPS satellites, that is, the positioning satellites for which the initial position for the acquisition process is determined are acquired, By filling the position with the positioning satellite that has moved the position set every cycle, that is, the QZSS satellite, the movement setting of the QZSS satellite is reduced or eliminated.
FIG. 6 is a diagram for describing setting of a positioning target positioning satellite in Modification 2 of the acquisition control process. Here, a case where two QZSS satellites are in operation will be described as an example.

  As shown in FIG. 6 (a), the capture of the first period in which the QZSS satellites with the identification codes QZS-01 and QZS-02 are captured instead of the GPS satellites with the identification codes GPS-01 and GPS-02. In the process, when a GPS satellite of GPS-05 is captured, in the capture process in the second and subsequent cycles, as shown in FIG. 6B, any QZSS satellite is captured as a capture target instead of the GPS-05. You can replace it as you do. The QZSS satellites to be replaced may be determined in order from 01, or QZSS satellites that should have been replaced with the GPS satellites of this GPS-05 (here, since they are odd-numbered, the QZSS-01 QZSS satellite).

  When positioning satellites more than the number of acquisition target QZSS satellites are acquired, here, when a GPS satellite (GSP-01) is acquired in the acquisition process of the second period, as shown in FIG. In addition, by replacing the positioning satellite with a QZSS satellite (here, QZS-02), it is not necessary to replace the QZSS satellite with another GPS satellite in subsequent capture 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 a QZSS satellite having an identification code of QZS-02 is acquired in the acquisition process of the first cycle, the QZSS satellite having an identification code of QZS-01 is shown in FIG. Only the GPS satellites whose ID is “03” or later are replaced in order, and are captured. In this case, the GPS satellites that are to be replaced with the identification code QZS-01 are only those that were originally planned to be replaced with the QZSS satellite (QZS-01) (here, the odd-numbered GPS satellites). Or all GPS satellites may be sequentially replaced.

  The acquisition process of the QZSS satellite replaced with the captured GPS satellite (the position is fixed) is replaced in the same manner as the original GPS satellite by the QZSS satellite that is not replaced (the position is not fixed). The QZSS satellite may be skipped and not replaced. That is, in the case where 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 period and the capturing process is performed. Then, in the fourth period, it may be replaced with a QZSS satellite (QZS-01) or may be skipped and replaced with a GPS satellite (GPS-06).

  When all the QZSS satellites to be captured are captured, it is not necessary to capture the QZSS satellites in the subsequent capture processing, and therefore, all the GPS satellites are not replaced as shown in FIG. 6 (f). Followed by the target of capture.

FIG. 7 is a flowchart illustrating a control procedure by the control unit 52 according to the second modification of the capture control process.
In this capture control process, steps S131 to S138 are added as compared to the capture control process of the above embodiment. Other processes are the same, and the same processing contents are denoted 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 in step S125 is not equal to or greater than the reference number (here, six) (“NO” in step S125), the control unit 52 determines that all acquisition targets It is determined whether or not the positioning satellite is already fixed (that is, whether or not P = 0) (step S131). When 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 fixed (“NO” in step S131), the control unit 52 performs the processing in step S138 among the positioning satellites captured in the latest processing in step S124. It is determined whether or not the number of QZSS satellites whose set positions are not fixed (referred to as movable QZSS satellites) 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 with all remaining positioning satellites as acquisition targets (step S133). Then, the process of the control unit 52 returns to step S124.

  When it is determined that the number of captured movable QZSS satellites is not equal to the number of movable satellites P (“NO” in step S132), the control unit 52 determines the number of movable QZSS satellites currently captured from the number of movable 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 latest processing of step S124 is greater than 0, that is, whether or not GPS satellites have been captured (step S135). If it is not greater than 0, that is, it is determined that 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 or not the number is greater than or equal to the number P (step S136). If it is determined that the number of movable satellites is equal to or greater than P (“YES” in step S136), the control unit 52 sets the remaining movable QZSS satellites as acquisition targets at the initial setting positions of the acquired GPS satellites. Then, the setting is fixed (step S137). Then, the process of the control unit 52 returns to step S124.

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

  As described above, if any of the GPS satellites with IDs X + 1 to X + P has been captured and replaced with another QZSS satellite in the process of step S123, the QZSS satellite is excluded as described above. If not, the replacement target ID 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 according to the present embodiment includes the receiving unit 51 that captures and receives at least any transmission radio wave among the plurality of positioning satellites, and the control unit 52. The unit 52 is an additional setting satellite other than the initial setting satellite that transmits a part of the transmission radio waves of the 32 GPS satellites that are predetermined initial setting satellites in the acquisition operation by the reception unit 51. When the capture operation is performed by replacing the transmission radio wave of the QZSS satellite and included in the capture target, and the capture operation is performed a plurality of times, a part of the transmission radio wave that is replaced for each capture operation is changed.
As a result, the transmission radio waves of the added positioning satellites such as the QZSS satellite can be captured in a well-balanced manner by the same process as when only the transmission radio waves of the GPS satellites are captured 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.

  In addition, the receiving unit 51 includes a matched filter that performs a capturing operation on a predetermined number of two or more, for example, transmission waves of 16 positioning satellites in parallel. In such a case, in particular, the channel for performing the capturing operation of the matched filter is effectively utilized without wasting it, and the capturing operation including the QZSS satellite is performed easily and efficiently without unnecessarily extending the capturing time. It is possible to capture radio waves from positioning satellites in a well-balanced manner.

  In the receiving unit 51, the number of radio waves to be captured in parallel by the matched filter is the same as or the divisor of the number of the initial setting satellites. As a result, radio waves can be captured while suppressing power consumption efficiently and in a short time without generating an empty channel of the matched filter. Then, when an additional setting satellite is included in the acquisition target for such a receiving unit 51, the acquisition operation is not performed by simply adding the additional setting satellite and performing the acquisition operation by replacing the initial setting satellite. By performing the above, it is possible to capture radio waves from an appropriate positioning satellite without reducing the efficiency.

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

  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 predetermined information related to the reception possibility of the transmission radio wave of the additional setting satellite (QZSS satellite). Whether or not to include. That is, when the receivable area is limited, such as a positioning satellite according to the regional positioning system, and it is possible to determine whether or not the current position is near 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, the acquisition operation of the initial setting satellites such as GPS satellites can be performed easily and efficiently as usual, without increasing unnecessary capturing operations. Can be done.

In addition, when at least a part of the transmission radio waves of the initial setting satellites to be captured is captured, the control unit 52 captures the transmission radio waves of the additional setting satellites equal to or less than the captured transmission radio waves. Replaced with the transmitted radio wave to be captured.
Thereby, it becomes possible to perform the capturing operation every time while the replaced additional setting satellite is excluded from the replacement target in the subsequent capturing operation. Therefore, it is possible to continue the acquisition operation of the positioning satellites that are not easily and efficiently acquired.

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

  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. As described above, while the positioning satellite that is normally always captured is set as the initial setting satellite, the positioning satellites related to the limited and few positioning systems according to the current position and the user's setting are additionally set as the initial setting satellites. By switching to the acquisition target, it is possible to capture the transmission radio waves of the positioning satellite that can receive the transmission radio waves in a balanced manner while maintaining the efficiency of the capture operation.

  In addition, the electronic timepiece 1 of the present embodiment includes the satellite radio wave reception processing unit 50 described above, a clock circuit 48 that counts the current time, and a display unit 62 that displays the current time based on the time counted by the clock circuit 48. And comprising. Thereby, in the electronic timepiece 1, the date and time information is acquired easily and efficiently without increasing the power consumption and the time required for positioning and acquisition of the current date and time and reflected in the timing circuit 48, and the accurate current date and time are used. Can be displayed.

  In addition, in the satellite radio wave capture control method described above by the satellite radio wave reception processing unit 50, radio waves from an appropriate positioning satellite can be easily obtained, particularly when a positioning satellite related to a plurality of positioning systems is selected and captured and data is received. Can be efficiently captured and received.

  In addition, by installing 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 and using the satellite radio wave reception control easily and appropriately in terms of software, the efficiency can be improved. Capable of capturing radio waves from a good positioning satellite.

The present invention is not limited to the above-described embodiment, and various modifications can be made.
For example, in the above embodiment, 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 captured simultaneously and in parallel. On the contrary, the radio waves of the positioning satellites may be captured one by one in order. Further, other than the divisor of 32, for example, the case where a configuration of 10 units is used is not excluded. In such a case, two of the QZSS satellites may be added to the initial setting satellite from the beginning, and only the remaining QZSS satellites may be taken as acquisition targets while being replaced with the initial setting satellites as movable QZSS satellites.

  Moreover, in the said embodiment, although it was set as the replacement object from GPS-01 in order with small GPS satellite ID, it is not restricted to this. Another order may be used, and a random order may be used as long as the replacement process is not complicated.

  In the above-described embodiment, the case where GPS is mainly used as a positioning satellite according to QZSS in Japan is described as an example. However, the present invention is not limited to this. In particular, the present invention can be effectively applied to a combination of a global satellite positioning system and a regional positioning system that use the same type of pseudo-random noise at the same transmission frequency.

  In addition, the positioning satellites related to the regional positioning system are not limited to the quasi-zenith satellites, but may include positioning satellites that stay biased over a limited area, such as geostationary orbit satellites.

  In the above embodiment, the operation information of the QZSS satellite is acquired from the outside using Bluetooth. However, other communication means may be used, and the communication means of the communication unit 63 provided in the electronic timepiece 1 may be: It is not limited to wireless communication. Further, the user may set operation information by performing an input operation via the operation receiving unit 61.

In the above description, the storage unit 53 formed of a nonvolatile memory is described as an example of a computer-readable medium for the operation processing program 532 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 other computer-readable media, a portable recording medium such as an HDD (Hard Disk Drive), 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 program data according to the present invention via a communication line.
In addition, specific details such as the configuration, control contents, and procedures shown in the above embodiment can be changed as appropriate without departing from the spirit of the present invention.

Although several embodiments of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and equivalents thereof.
The invention described in the scope of claims attached to the application of this application will be added below. The item numbers of the claims described in the appendix are as set forth in the claims attached to the application of this application.

[Appendix]
<Claim 1>
A reception processing unit that captures and receives at least one transmission radio wave among a plurality of satellites;
A control unit;
With
In the capturing operation by the reception processing unit, the control unit replaces some of the transmission radio waves of the initial setting satellites that are predetermined as acquisition targets with the transmission radio waves of the additional setting satellites other than the initial setting satellites. A satellite radio wave receiving device characterized in that, when the capture operation is included in the capture target and the capture operation is performed a plurality of times, the part of the transmission radio waves replaced for each capture operation is changed. .
<Claim 2>
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 two or more predetermined number of satellites are captured in parallel.
<Claim 3>
3. The satellite radio wave receiver according to claim 2, wherein the reception processing unit has the predetermined number equal to or a divisor of the number of the initial setting satellites.
<Claim 4>
The satellite radio wave receiver according to any one of claims 1 to 3, wherein the controller determines the part of the transmission radio waves to be replaced in a predetermined order.
<Claim 5>
The control unit 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 related to the reception possibility of the transmission radio wave of the additional setting satellite and includes it in the capture target. The satellite radio wave receiver according to claim 1, wherein the satellite radio wave receiver is defined.
<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 transmits 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 receiver according to claim 1, wherein the radio wave receiver is replaced with a captured transmission radio wave as the target to be captured.
<Claim 7>
The control unit does not set the captured transmission radio wave as the capture target in the subsequent capture operation when a part of the transmission radio wave of the additional setting satellite is captured. The satellite radio wave receiving device according to any one of?
<Claim 8>
The initial setting satellite is a positioning satellite according to a predetermined satellite positioning system for the entire earth, and the additional setting satellite is a positioning satellite according 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>
The satellite radio wave receiver according to any one of claims 1 to 8,
A timer 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 characterized by comprising:
<Claim 10>
A satellite radio wave capturing control method of a satellite radio wave receiving device including a reception processing unit that captures and receives at least any transmission radio wave among a plurality of satellites,
In the capturing operation by the reception processing unit, a part of the transmission radio waves of the initial setting satellites predetermined as acquisition targets are replaced with the transmission radio waves of the additional setting satellites other than the initial setting satellites and included in the acquisition target A capture target replacement step for changing the part of the transmitted radio waves to be replaced for each capture operation when the capture operation is performed a plurality of times. Control method.
<Claim 11>
A computer of a satellite radio wave receiving device including a reception processing unit that captures and receives at least one transmission radio wave among a plurality of satellites,
In the capturing operation by the reception processing unit, a part of the transmission radio waves of the initial setting satellites predetermined as acquisition targets are replaced with the transmission radio waves of the additional setting satellites other than the initial setting satellites and included in the acquisition target When the capture operation is performed and the capture operation is performed a plurality of times, the program is made to function as a capture target replacement unit that changes the part of the transmission radio waves that are 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 Frequency division circuit 48 Time counting 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 transmission radio wave among a plurality of satellites;
A control unit;
With
In the capturing operation by the reception processing unit, the control unit replaces some of the transmission radio waves of the initial setting satellites that are predetermined as acquisition targets with the transmission radio waves of the additional setting satellites other than the initial setting satellites. A satellite radio wave receiving device characterized in that, when the capture operation is included in the capture target and the capture operation is performed a plurality of times, the part of the transmission radio waves replaced for each capture operation is changed. .   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 two or more predetermined number of satellites are captured in parallel.   3. The satellite radio wave receiver according to claim 2, wherein the reception processing unit has the predetermined number equal to or a divisor of the number of the initial setting satellites.   The satellite radio wave receiver according to any one of claims 1 to 3, wherein the controller determines the part of the transmission radio waves to be replaced in a predetermined order.   The control unit 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 related to the reception possibility of the transmission radio wave of the additional setting satellite and includes it in the capture target. The satellite radio wave receiver according to claim 1, wherein the satellite radio wave receiver is defined.   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 transmits 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 receiver according to claim 1, wherein the radio wave receiver is replaced with a captured transmission radio wave as the target to be captured.   The control unit does not set the captured transmission radio wave as the capture target in the subsequent capture operation when a part of the transmission radio wave of the additional setting satellite is captured. The satellite radio wave receiving device according to any one of?   The initial setting satellite is a positioning satellite according to a predetermined satellite positioning system for the entire earth, and the additional setting satellite is a positioning satellite according 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. The satellite radio wave receiver according to any one of claims 1 to 8,
A timer 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 characterized by comprising: A satellite radio wave capturing control method of a satellite radio wave receiving device including a reception processing unit that captures and receives at least any transmission radio wave among a plurality of satellites,
In the capturing operation by the reception processing unit, a part of the transmission radio waves of the initial setting satellites predetermined as acquisition targets are replaced with the transmission radio waves of the additional setting satellites other than the initial setting satellites and included in the acquisition target A capture target replacement step for changing the part of the transmitted radio waves to be replaced for each capture operation when the capture operation is performed a plurality of times. Control method. A computer of a satellite radio wave receiving device including a reception processing unit that captures and receives at least one transmission radio wave among a plurality of satellites,
In the capturing operation by the reception processing unit, a part of the transmission radio waves of the initial setting satellites predetermined as acquisition targets are replaced with the transmission radio waves of the additional setting satellites other than the initial setting satellites and included in the acquisition target When the capture operation is performed and the capture operation is performed a plurality of times, the program is made to function as a capture target replacement unit that changes the part of the transmission radio waves that are replaced for each capture operation.

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