JP6855750B2 - Radio clock, radio reception control method, and program - Google Patents

Description

The present invention relates to a radio clock, a radio reception control method, and a program.

Accurate by receiving radio waves from long wavelength band radio waves (standard radio waves) including date and time information and radio waves from satellites (positioning satellites) that transmit positioning information related to GNSS (Global Navigation Satellite System) and acquiring date and time information. There is an electronic clock (radio clock) that can keep counting and displaying the date and time. In addition, there is an electronic clock that can calculate and display the local time (local time) by selecting the time zone and daylight saving time implementation rules according to the current position by receiving radio waves from the positioning satellite and performing positioning. ..

As the positioning satellite, the US GPS (Global Positioning System) satellite (GPS satellite) that covers the entire global range has been widely used, and Russia's GLONASS and the like can also be used. In addition to this, in recent years, regional positioning satellites that can receive radio waves in specific areas such as quasi-zenith satellites and geostationary satellites, such as Japan's "Michibiki", have been supplemented with a global positioning system to make it more reliable. Technologies for accurate positioning and acquisition of date and time information have been developed. Since the orbit of a quasi-zenith satellite is usually designed so that it stays near the zenith for a long time, radio waves can be easily captured even between high-rise buildings and valleys on the terrain, and sufficient reception strength can be easily obtained.

In this case, the positioning device that receives the radio waves from the positioning satellites captures the radio waves from both the positioning satellites related to the positioning system in the global range and the regional positioning satellites. Patent Document 1 discloses a technique for changing the acquisition order of regional positioning satellites or excluding them from acquisition targets based on the previous positioning results and user settings.

Japanese Unexamined Patent Publication No. 2016-31232

However, radio-controlled clocks, especially portable ones whose main purpose of positioning is to determine the time zone, tend to execute positioning operations less frequently, and the current position at the time of capturing and receiving satellite radio waves tends to be regional positioning. There is a problem that it is difficult to properly determine whether or not the satellite is within the radio wave capture range.

An object of the present invention is to provide a radio clock, a radio reception control method, and a program capable of more appropriately controlling radio wave acquisition operation of a regional positioning satellite.

In order to achieve the above object, the present invention
A satellite radio wave receiver that receives radio waves from positioning satellites,
A terrestrial receiver that receives terrestrial waves transmitted to a specific broadcasting area,
The satellite radio wave receiving unit receives radio waves from a regional positioning satellite that locally transmits radio waves to the radio wave transmitting area corresponding to the broadcasting area of the terrestrial broadcasting received by the terrestrial broadcasting unit. And the control unit that lets you do
The operation reception unit that accepts user operations and
With
The operation accepted by the operation reception unit includes switching to a transmission / reception prohibition mode for prohibiting an operation related to transmission / reception of a predetermined radio wave.
When the transmission / reception prohibition mode is switched, the control unit excludes radio waves from the regional positioning satellite, which is the acquisition target, from the acquisition target.
After excluding the regional positioning satellite that is the capture target from the capture target, when the terrestrial receiving unit receives the terrestrial wave, the radio wave from the regional positioning satellite is returned to the capture target. It is a radio clock.

According to the present invention, there is an effect that the radio-controlled clock can more appropriately control the radio wave capture operation of the regional positioning satellite.

It is a block diagram which shows the functional structure of a radio-controlled clock. It is a figure explaining the waveform of the standard radio wave which is received by the radio clock. It is a flowchart which shows the control procedure of the MICHIBIKI correspondence setting process executed by a radio clock. It is a flowchart which shows the control procedure by the CPU 41 of the reception control processing executed by the radio clock.

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 a radio-controlled clock 1 according to an embodiment of the present invention.

The radio-controlled clock 1 is, for example, a wristwatch or the like worn on the user's body, a pocket watch, or the like, but is not limited thereto.
The radio clock 1 includes a microcomputer 40 (computer), a satellite radio wave reception processing unit 50, an antenna A1, an operation reception unit 61, a display unit 62, a standard radio wave reception unit 63 (terrestrial wave reception unit), and an antenna A2. It includes a light amount sensor 64, a power supply unit 70, and the like.

The microcomputer 40 controls the overall operation of the radio clock 1. The microcomputer 40 includes a CPU 41 (Central Processing Unit) (control unit), a ROM 42 (Read Only Memory), a RAM 43 (Random Access Memory), an oscillation circuit 46, a frequency dividing circuit 47, a time counting circuit 48, 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 have a non-volatile memory such as a flash memory capable of rewriting and updating data in addition to or in place of the mask ROM.

The RAM 43 provides the CPU 41 with a working memory space and stores temporary data.
The RAM 43 displays the current date and time (local time) at the current position (home city), and stores the local time setting 434 including the time zone setting and the daylight saving time setting when using the RAM 43. The local time setting 434 is manually set by an input operation via the user's operation reception unit 61, or is automatically set according to the current position obtained by the positioning operation of the satellite radio wave reception processing unit 50.

Further, the RAM 43 stores and holds the MICHIBIKI reception flag 431, the second synchronization OK flag 432, and the date and time acquisition success flag 433. The MICHIBIKI reception flag 431 is a binary flag that determines whether or not the MICHIBIKI satellite is added to the acquisition target when receiving a radio wave from the positioning satellite. The date / time acquisition success flag 433 is a binary flag indicating whether or not accurate date / time information on each date has been acquired from the outside, that is, by a standard radio wave or a radio wave from a positioning satellite. The second synchronization OK flag 432 is a binary flag indicating whether or not the detection of the second synchronization point was successful at the time of receiving the standard radio wave on each date.

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

The frequency dividing circuit 47 outputs a frequency divided signal obtained by dividing the frequency signal input from the oscillation circuit 46 by a set division ratio. The frequency division ratio setting may be changed by the CPU 41.
The timekeeping circuit 48 holds the current date and time by counting the frequency division signals of a predetermined frequency input from the frequency division circuit 47. The current date and time counted by the timekeeping circuit 48 can be corrected by a control signal from the CPU 41 based on an 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 (reception operation) radio waves transmitted from a positioning satellite of a satellite positioning system such as GPS (Global Positioning System) in the United States, acquires date and time information and current position information, and causes the CPU 41. Output. The satellite radio wave reception processing unit 50 includes a reception unit 51 (satellite radio wave reception unit), a control unit 52, a storage unit 53, and the like.

The receiving unit 51 includes a capturing unit 511, a tracking unit 512, and the like. The acquisition unit 511 receives and detects radio waves from the positioning satellite to be received, identifies the positioning satellite, and performs acquisition processing for identifying the phase of the transmission signal. The satellite radio wave reception processing unit 50 of the radio-controlled clock 1 of the present embodiment has a configuration capable of capturing radio waves transmitted 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 of the information transmitted from each positioning satellite, which is necessary for obtaining desired information, based on the format of the navigation message of each positioning satellite that can be received. From the signal (L1 band) from the GPS positioning satellite (hereinafter referred to as GPS satellite), if the date and time can be specified from the date and time information (the date and time counted by the time counting circuit 48), at least the elapsed time within the week (TOW) -Count)), its reception timing, and the orbit information of each captured GPS satellite are acquired. 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, and further, the accurate date and time identified by the distance between each GPS satellite and the current position. The delay time from the date and time can be 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, format data of the navigation message of each positioning satellite, reference data for determining the reception level, and the like. In addition, the received information includes, for example, the acquired predicted orbit information (Almanac) of each positioning satellite and the implementation notice information of leap seconds.

The operation receiving unit 61 receives 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 switches 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 plurality of rotatably provided pointers 621, a stepping motor 622 for rotating the plurality of pointers 621, a drive circuit 623 of the stepping motor 622, and the like. The plurality of pointers may include an hour hand, a minute hand, a second hand, and may further include a functional hand that displays according to a predetermined function. Alternatively, the display unit 62 may have a configuration in which a display is performed on a digital display screen such as a liquid crystal display screen (LCD) in place of or in addition to the display based on these pointers. The content displayed by the display unit 62 includes information related to the current date and time.

The standard radio wave receiving unit 63 is a standard radio wave (terrestrial wave transmitted to a specific broadcasting area; which is transmitted by amplitude-modulated date and time information in a long wavelength band via the antenna A2 under the control of the CPU 41; The terrestrial wave referred to here is a wavelength band in which a component transmitted near the ground surface and transmitted directly (direct wave) near the ground surface (including the sea surface) or curved along the ground surface (ground wave) is mainly received. (It is a broadcast radio wave of) is received and demolished. The standard radio waves to be received include JJY (registered trademark; 40 kHz and 60 kHz) whose broadcasting area is Japan, WWVB (60 kHz) whose broadcasting area is the United States, and DCF77 (77) whose broadcasting area is mainly from Germany to the Midwestern part of Europe. .5 kHz) and MSF (60 kHz) whose broadcasting area is mainly in the northwestern part of Europe from the United Kingdom. It is digitally binarized according to the format of and output to the CPU 41. The standard radio wave receiving unit 63 is selectively supplied with power from the power supply unit 70 only during operation under the control of the CPU 41.

The light amount sensor 64 is provided, for example, in parallel with the display screen of the display unit 62, and measures the amount of light emitted from the outside. As the light amount sensor 64, for example, a photodiode is used. The light amount sensor 64 outputs an electric signal (voltage signal or current signal) according to the amount of incident light, and this electric signal is digitally sampled by an ADC (analog / digital converter) (not shown) and input to the CPU 41.

The power supply unit 70 supplies the electric power required for operation by each unit of the radio-controlled clock 1 to each unit. The power supply unit 70 supplies the power output from the battery 71 at the operating voltage of each unit. When the operating voltage differs depending on the operating portion, 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 the like, or a dry battery, a rechargeable battery, or the like may be detachably provided.

Next, the radio waves transmitted 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 it belongs, spread spectrum with a pseudo-random code sequence (pseudo-random noise; PRN) different for each positioning satellite. ing. The C / A code, which is a pseudo-random 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;) that complements it. Quasi-Zenith Satellites System) In "MICHIBIKI" and the like, there is an array of 1023 codes, and these code sequences are repeatedly used at a cycle of 1 msec (1.023 MHz). The radio-controlled clock 1 detects and demodulates a signal including a navigation message by spreading the received radio wave in the reverse spectrum using the C / A code.

Normally, 32 positioning satellites are operated in GPS, and in an open space, radio waves from the number of GPS satellites required for positioning can always be received.
On the other hand, as a positioning satellite related to QZSS (regional positioning satellite; referred to as Michibiki satellite), the first one is currently in operation, and at least one will stay near the zenith of Japan and radio waves locally in Japan. It is expected that about 3 to 6 aircraft will be added to keep the transmission area. Information related to the number of satellites in operation may be input based on user operation, or may be acquired from a received navigation message or the like.

When the receivable positioning satellite is not known, the receiving device detects the signal by applying the C / A code of all the positioning satellites to the received radio wave in all phases and calculating the autocorrelation of each C. A capture process is performed to identify the type of / A code and its phase at the time of reception. In the radio clock 1, the capture unit 511 of the satellite radio wave reception processing unit 50 applies the C / A codes of a plurality of (a predetermined number of 2 or more) positioning satellites to be captured in parallel to the received radio waves. The C / A codes to be applied are exchanged in order, and the process is repeated until the transmission radio waves of all the positioning satellites to be captured are captured. Such processing is performed here using a dedicated hardware circuit such as a matched filter (matched filter). In each matched filter, a channel holding a C / A code related to the positioning satellite to be captured is determined, and the received signal and the autocorrelation value are calculated respectively. The C / A code held in each channel can be rewritten and / or switched. If a positioning satellite that cannot be received can be identified, the positioning satellite is excluded from the acquisition target.

Next, the date and time information transmitted by the standard radio wave will be described.
In standard radio waves, one code is transmitted every second in synchronization with each second, and an array of these codes (time code signal) transmitted in a cycle of 1 minute from the beginning of each minute is decoded and decoded according to a predetermined format. As a result, date and time information including the date and time of the one minute is acquired. The time code signal includes a unique code string for identifying the start position of each minute. In the radio-controlled clock 1, after identifying the timing (second synchronization point) synchronized with each second, each code is assigned. By detecting the code string while identifying, the beginning of each minute (0 seconds; minute synchronization point) is identified, and the time code signal is decoded with reference to the minute synchronization point. Normally, the correct date and time information is acquired when the date and time information is acquired a plurality of times, for example, three times in succession, and the date and time one minute and two minutes after the first identification date and time are accurately acquired, respectively. It is considered to be.

FIG. 2 is a diagram illustrating a waveform of a standard radio wave to be received in the present embodiment.
At 60 kHz, as described above, radio waves are transmitted by MSF and WWVB in addition to JJY. In the time code signal, a square wave in which the radio field strength (carrier wave strength) is defined as a predetermined intensity period and a period weaker than the predetermined intensity is used in units of 1 second, depending on the arrangement and length of these periods. The code is determined. In JJY, as shown in FIG. 2A, in both 40 kHz and 60 kHz, the signal strength rises at the beginning of each second (second synchronization point, timing t0, t1), that is, at the beginning position of each code, and the signal strength rises for a predetermined time. After being maintained, a period of signal strength of 10% of the signal strength continues until the timing of the next second synchronization point. On the other hand, in MSF and WWVB, as shown in FIGS. 2 (b) and 2 (c), the signal strength drops at the second synchronization point (timing t0, t1), and then a period with strong signal strength is set. In MSF, the radio signal is turned off from the fall to the rise of the signal strength. In WWVB, the signal strength is reduced by 17 dB during the period when the signal is weak as compared with the period when the signal is strong. Therefore, by succeeding in detecting the rise of the signal strength every second at 40 kHz or 60 kHz, it is confirmed that the JJY radio wave is received (it is determined that the signal is received), and the second synchronization point (the beginning of each code). Location) is identified.

Next, the reception operation of the standard radio wave and the satellite radio wave in the radio clock 1 will be described.
In the radio clock 1 of the present embodiment, whether or not JJY, which is a Japanese standard radio wave, can be received is used to determine whether or not the MICHIBIKI satellite is used, that is, whether or not the MICHIBIKI satellite is added to the acquisition target. At the same time, as a result of the actual positioning, whether or not to use the MICHIBIKI is determined based on the user's home city setting and the action suggesting the movement. In addition, even if the position change information and settings are not acquired after the latest JJY is received, if JJY is not received again within the predetermined upper limit period, here, within 7 days, Michibiki Stop using and exclude from capture.

In the radio-controlled clock 1 of the present embodiment, the reception of the standard radio wave is repeated every day at a plurality of preset times, for example, every hour from 0:00 to 4:00 in the local time of Tokyo until the reception is successful. If an attempt is made and the second synchronization is not successful by 4:00, reception is attempted again at 5:00. That is, due to this reception operation, the radio clock 1 is located in the JJY broadcasting area (in the radio wave transmitting area of Michibiki (regional positioning satellite) corresponding to the JJY (terrestrial) broadcasting area) every day from early morning to early morning. It is determined whether or not (there was a user of the radio clock 1).

FIG. 3 is a flowchart showing a control procedure by the CPU 41 of the MICHIBIKI correspondence setting process executed by the radio-controlled clock 1 of the present embodiment.
This MICHIBIKI correspondence setting process is called and executed when the home city setting is changed, the airplane mode setting is changed, and the day carry is executed (that is, the timing when the date changes at 0:00).
Here, the airplane mode (transmission / reception prohibition mode) is a mode for prohibiting the operation related to the transmission / reception of a predetermined radio wave so as not to adversely affect the control of the aircraft at the time of takeoff, landing, etc. It is possible to switch on and off based on a predetermined input operation. That is, it is assumed that this airplane mode is set when the user moves using an aircraft.

First, the CPU 41 determines whether or not the currently set home city is TYO (Tokyo) (step S101). If multiple home cities in Japan other than Tokyo are set, these are also included. If it is determined that the home city is not TYO (“NO” in step S101), the processing of the CPU 41 shifts to step S108.

If it is determined that the home city is TYO (“YES” in step S101), the CPU 41 determines whether or not the transition to airplane mode has been detected (step S102). If it is determined that the detection has been detected (“YES” in step S102), the processing of the CPU 41 proceeds to step S108.

If it is determined that the transition to the airplane mode has not been detected (“NO” in step S102), the CPU 41 determines whether or not it is the day carry timing (step S103). If it is determined that the timing is not the day carry timing (“NO” in step S103), the CPU 41 ends the michibiki correspondence setting process.

When it is determined that the timing is the day carry (“YES” in step S103), the CPU 41 sets the date / time acquisition success flag 433 to OFF, and sets the second synchronization OK flag 432 to OFF (step). S104). The CPU 41 determines whether or not the MICHIBIKI reception flag 431 is ON (step S105). If it is determined that it is not ON (OFF) (“NO” in step S105), the CPU 41 ends the MICHIBIKI correspondence setting process.

When it is determined that the MICHIBIKI reception flag 431 is ON (“YES” in step S105), the CPU 41 decrements the value of the effective days counter by 1 (step S106). The CPU 41 determines whether or not the value of the effective days counter has become "0" (step S107). If it is determined that the value is not "0" ("NO" in step S107), the CPU 41 ends the MICHIBIKI correspondence process. If it is determined that the value is "0" ("YES" in step S107), the processing of the CPU 41 proceeds to step S108.

When the process of steps S101, S102, and S107 shifts to the process of step S108, the CPU 41 sets the MICHIBIKI reception flag 431 to OFF (step S108). Then, the CPU 41 ends the MICHIBIKI correspondence setting process.

FIG. 4 is a flowchart showing a control procedure by the CPU 41 of the reception control process executed by the radio clock 1. This reception control process is activated at a timing when a predetermined condition for receiving a standard radio wave or a radio wave of a positioning satellite is satisfied. The predetermined conditions are a predetermined time as the time when the standard radio wave reception processing can be performed every day, and a predetermined condition as the timing when the radio wave can be received from the positioning satellite every day, for example, the date and time information by the positioning satellite. The timing at which the light intensity sensor 64 first detects the predetermined light intensity on each date in the state where the acquisition setting is made (such as when the reception area is out of the standard radio wave reception area or the reception area is set but the reception is not successful), and For example, when the operation reception unit 61 receives a date / time information acquisition or a positioning operation execution command by a predetermined input operation.

When the reception control process is started, the CPU 41 determines whether or not the date / time acquisition success flag 433 is ON (step S401). If it is determined to be ON (“YES” in step S401), the processing of the CPU 41 proceeds to step S405. If it is determined that it is not ON (OFF) (“NO” in step S401), the CPU 41 determines whether or not it is within the reception area of any standard radio wave (step S402). If it is determined that the area is not within the reception area (“NO” in step S402), the processing of the CPU 41 proceeds to step S405.

If it is determined that it is within the reception area (“YES” in step S402), the CPU 41 determines whether or not it is the reception start set time of the standard radio wave that is within the reception range (step S403). When it is determined that the reception start set time is, for example, every hour from 0:00 to 4:00 (“YES” in step S403), the processing of the CPU 41 shifts to step S422. If it is determined that it is not the reception start set time (“NO” in step S403), the CPU 41 further determines whether or not it is the second-synchronized reception start time that is additionally performed (step S404). When it is determined that the second synchronization reception start time is, for example, 5:00 (“YES” in step S404), the CPU 41 determines whether or not the second synchronization OK flag 432 is ON (step). S421). If it is determined to be ON (“YES” in step S421), the CPU 41 ends the reception control process. If it is determined that it is not ON (“NO” in step S421), the processing of the CPU 41 proceeds to step S422. If it is determined that the time is not the second synchronous reception start time (“NO” in step S404), the processing of the CPU 41 proceeds to step S405.

When the process shifts from the discrimination process of steps S403 and S421 to the process of step S422, the CPU 41 operates the standard radio wave receiving unit 63 to receive the standard radio wave to be received (step S422). The CPU 41 acquires the received and demodulated binary signal, detects the second synchronization point, and determines whether or not the detection of the second synchronization point is successful within a predetermined upper limit time (step S423). If it is determined that the second synchronization point has not been successfully detected (“NO” in step S423), the CPU 41 ends the reception operation of the standard radio wave by the standard radio wave receiving unit 63, and ends the reception control process.

If it is determined that the second synchronization point has been successfully detected (“YES” in step S423), the CPU 41 sets the second synchronization OK flag 432 to ON (step S424). The CPU 41 determines whether or not the received radio wave that has succeeded in second synchronization is JJY (step S425). If it is determined that it is not JJY (“NO” in step S425), the processing of the CPU 41 proceeds to step S427. If it is determined to be JJY (“YES” in step S425), the CPU 41 sets the MICHIBIKI reception flag 431 to ON and sets the value of the valid days counter to “7” (step S426). .. Then, the process of the CPU 41 shifts to step S427.

When the process proceeds to step S427, the CPU 41 decodes (decodes) the identified code string to acquire date and time information. Then, the CPU 41 determines whether or not the acquisition of the date and time information is successful (step S427). If it is determined that the acquisition of the date and time information has not been successful (“NO” in step S427), the CPU 41 ends the reception operation by the standard radio wave receiving unit 63 and ends the reception control process.

When it is determined that the acquisition of the date and time information is successful (“YES” in step S427), the CPU 41 sets the reception success flag 433 to ON (step S428). Then, the CPU 41 ends the reception operation by the standard radio wave receiving unit 63, and ends the reception control process.

When the process shifts from the discrimination process of steps S401, S402, and S404 to the process of step S405, the CPU 41 has acquired the radio wave reception command from the positioning satellite (starting the reception control process based on the operation setting of radio wave reception from the positioning satellite). (Step S405). If it is determined that the radio wave reception command from the positioning satellite has not been acquired (“NO” in step S405), the CPU 41 ends the reception control process.

When it is determined that the radio wave reception command from the positioning satellite has been acquired (“YES” in step S405), the CPU 41 determines whether or not the MICHIBIKI reception flag 431 is ON (step S406). If it is determined to be ON (“YES” in step S406), the CPU 41 activates the satellite radio wave reception processing unit 50, and the reception unit 51 receives radio waves for the positioning satellite including the MICHIBIKI. (Step S407). Then, the process of the CPU 41 shifts to step S409. When it is determined that the satellite is not ON (OFF) (“NO” in step S406), the CPU 41 activates the satellite radio wave reception processing unit 50, and the reception unit 51 captures the positioning satellite not including the MICHIBIKI. (Step S408). Then, the process of the CPU 41 shifts to step S409.

When the process of steps S407 and S408 shifts to the process of step S409, the CPU 41 determines whether or not positioning has been performed based on the radio wave signal received from the positioning satellite (step S409). When it is determined that positioning is not performed (“NO” in step S409), that is, when only the date and time information is acquired, the CPU 41 ends the reception control process.

If it is determined that the positioning has been performed (“YES” in step S409), the CPU 41 determines whether or not the current position obtained as a result of the positioning is within the reception area of the MICHIBIKI (step S410). When it is determined that the area is within the MICHIBIKI reception area (“YES” in step S410), the CPU 41 sets the MICHIBIKI reception flag 431 to ON and sets the value of the valid days counter to “7” (step). S412). Then, the CPU 41 ends the reception control process. If it is determined that the area is out of the reception area (“NO” in step S410), the CPU 41 sets the MICHIBIKI reception flag 431 to OFF (step S411). Then, the CPU 41 ends the reception control process.
Among the above processing operations, the capture target setting step (capture target setting means) is configured by each process of the MICHIBIKI correspondence setting process and the processes of steps S406 to S408, S425, S426 and the like in the reception control process.

As described above, the radio wave clock 1 of the present embodiment includes the receiving unit 51 of the satellite radio wave receiving processing unit 50 that receives radio waves from the positioning satellite and the terrestrial wave transmitted to a specific broadcasting area, that is, a standard. A regional positioning satellite (Michibiki) that locally transmits radio waves to the standard radio wave receiving unit 63 that receives radio waves and the radio wave transmitting area corresponding to the broadcasting area of the standard radio wave (JJY) received by the standard radio wave receiving unit 63. ) Is provided with a CPU 41 that causes the receiving unit 51 to perform a receiving operation by capturing the radio wave from).
In this way, the radio waves from the regional positioning satellites in the area corresponding to the reception area of the standard radio waves are captured depending on whether or not the standard radio waves are received, so that the radio waves of the regional positioning satellites can be easily picked up without the need for user settings. It is possible to appropriately determine the necessity of the acquisition operation and to easily acquire the date and time and position information more accurately by using the radio waves from the preferable positioning satellite without waste. That is, the radio-controlled clock 1 can more appropriately control the radio wave acquisition operation of the regional positioning satellite. In particular, a device having a low frequency of positioning by receiving radio waves from the positioning satellite, and the power consumption required for receiving the radio waves are consumed. For devices that are large compared to the battery capacity, it is possible to almost reliably determine whether or not the device is within the radio wave transmission area of the regional positioning satellite without actually performing positioning. That is, when the terrestrial wave (standard radio wave) of the broadcasting area corresponding to the radio wave transmission area of the regional positioning satellite is not received, the operation of capturing the radio wave from the unreceivable regional positioning satellite is omitted (excluded from the acquisition target). ), So the efficiency of power consumption can be improved.

Further, the CPU 41 is a regional positioning satellite (MICHIBIKI) in which the broadcasting area of the standard radio wave (JJY) and the radio wave transmitting area correspond to each other until 7 days have passed since the standard radio wave was recently received by the standard radio wave receiving unit 63. ) Is targeted for capture.
Since it is often difficult to receive standard radio waves in buildings, etc., if it is a condition of whether or not to add the regional positioning satellite to the radio wave acquisition target, it is necessary to capture the regional positioning satellite more than necessary. May be excluded from. Therefore, once the standard radio wave is received, by providing a certain period of validity, it is possible to prevent unnecessary capture operation from continuing for a long period of time, and to perform capture operation of a regional positioning satellite with relatively high receivability. It can be done selectively.

Further, the operation receiving unit 61 for receiving the user operation is provided, and the operation received by the operation receiving unit 61 includes switching to the airplane mode for prohibiting the operation related to the transmission and reception of a predetermined radio wave, and the CPU 41 shifts to the airplane mode. When switching is performed, the regional positioning satellites to be captured are excluded from the capture targets.
Switching to airplane mode is assumed to be boarding an aircraft and long-distance movement, and accompanying this, movement outside the radio wave transmission area of the regional positioning satellite may occur. In such a case, capture once. By excluding it from the target and adding it to the capture target again according to the presence or absence of reception of the standard radio wave, it is possible to reduce the execution probability of the useless capture operation.

In addition, terrestrial broadcasting targeting a specific broadcasting area includes standard radio waves in a long wavelength band including date and time information. That is, since it is determined that the regional positioning satellite is to be captured based on the presence or absence of reception of the standard radio wave normally used for acquiring the date and time information in the radio clock and correcting the date and time counted by the timekeeping circuit 48, unnecessary radio wave reception operation is performed. No need to do. In addition, radio waves in the long wavelength band have a moderately wide reception area, and it is difficult to receive radio waves in a range extremely outside the normal broadcasting area due to ionospheric reflection such as medium waves, so the radio wave transmission range of regional positioning satellites. It is easy to associate with.

Whether or not the standard radio wave is received is determined by whether or not the start position of each code transmitted in the standard radio wave, that is, whether or not the rise or fall of the radio wave intensity at the second synchronization point is successfully detected. That is, even if the date and time information is not accurately acquired from the standard radio wave, it is only necessary to identify that the standard radio wave is being received. Therefore, even if it is difficult to acquire the date and time information in a noisy situation, the standard is required. It is possible to appropriately determine whether or not the radio wave is within the broadcasting area.

Further, as described above, the radio wave reception control method in the radio clock 1 of the present embodiment locally transmits radio waves to the radio wave transmission area corresponding to the broadcast area of the standard radio wave received by the standard radio wave receiving unit 63. This includes a capture target setting step in which the receiving unit 51 performs a reception operation on the radio waves from the regional positioning satellite to be transmitted as the capture target. As a result, it is possible to control the satellite radio wave capture operation so that the capture operation of the regional positioning satellite that can be received more appropriately can be selectively performed.

Further, by installing a program 421 including MICHIBIKI correspondence setting processing and reception control processing in the storage unit (ROM42) and executing it by the CPU 41 (microcomputer 40), a regional positioning satellite capable of receiving easily and more appropriately by software control. It is possible to control the capture operation of the satellite radio wave so that the capture operation of the satellite radio wave can be selectively performed.

The present invention is not limited to the above embodiment, and various modifications can be made.
For example, in the above embodiment, it is determined whether or not the MICHIBIKI satellite receives radio waves in correspondence with JJY, but the present invention is applied when the regional positioning satellite is operated in the reception range of other standard radio waves. Can be done.

Further, in the above embodiment, once the standard radio wave is received, it is valid for 7 days, but the present invention is not limited to this. It may be shorter, or an upper limit period may be set such as until the final reception timing of the standard radio wave on the next day. In this case, an effective time counter may be used instead of the effective days counter, or the last timing data of the upper limit period may be directly retained and compared with the current date and time at predetermined time intervals. Alternatively, the corresponding regional positioning satellite may be excluded from the acquisition target immediately when the reception fails once. Further, it is not necessary to separately set the MICHIBIKI reception flag 431 to determine whether or not the MICHIBIKI satellite is to be captured depending on whether or not the value of the effective days counter is "0".

Further, in the above embodiment, the operation switching function of the airplane mode is provided, and the regional positioning satellite is excluded from the acquisition target in accordance with the switching to the airplane mode, but it is not always necessary to exclude it, and it is predetermined. It may be excluded only when the airplane mode is continued for more than an hour. Alternatively, the radio clock 1 may simply have no airplane mode.

Further, in the above embodiment, the reception of the standard radio wave is only performed periodically from dawn to early morning, but it may be possible for the user to perform an operation by a predetermined input operation to the operation reception unit 61. It is also possible to detect only the second synchronization point when the airplane mode is canceled. Further, this detection operation may be performed only when the duration of the airplane mode is within a predetermined time or when it is longer than a predetermined time.

Further, in the above embodiment, the standard radio wave in the long wavelength band and the reception range of the regional positioning satellite are associated with each other, but other broadcast radio waves having a limited broadcasting area such as the standard radio wave in the short wavelength band are received. May be said.

Further, in the above embodiment, the presence / absence (whether or not) of reception is determined by detecting the second synchronization point, but if it is possible to specify which broadcasting station the radio wave is from, the criterion for determining whether or not to receive is this. Not limited to.

Further, in the above embodiment, the CPU 41 performs all the control operations, but a part of the control operations may be shared with the control unit 52 of the satellite radio wave reception processing unit or the like. Further, the CPU 41 does not control all of them, but may include a dedicated logic circuit or the like that performs control processing.

Further, in the above description, the ROM 42 which can include the non-volatile memory as a computer-readable medium of the program 421 of the operation processing such as the MICHIBIKI correspondence setting processing and the reception control processing related to the processing operation of the CPU 41 according to the present invention is given as an example. However, it is not limited to this. As other computer-readable media, HDDs (Hard Disk Drives) and portable recording media such as CD-ROMs and DVD discs can be applied. A carrier wave is also applied to the present invention as a medium for providing data of a program 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-described 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, but includes the scope of the invention described in the claims and the equivalent scope thereof.
The inventions described in the claims originally attached to the application of this application are added below. The claims in the appendix are as specified in the claims originally attached to the application for this application.

[Additional Notes]
<Claim 1>
A satellite radio wave receiver that receives radio waves from positioning satellites,
A terrestrial receiver that receives terrestrial waves transmitted to a specific broadcasting area,
The satellite radio wave receiving unit receives radio waves from a regional positioning satellite that locally transmits radio waves to the radio wave transmitting area corresponding to the broadcasting area of the terrestrial broadcasting received by the terrestrial broadcasting unit. And the control unit that lets you do
A radio-controlled clock characterized by being equipped with.
<Claim 2>
The control unit receives radio waves from a regional positioning satellite corresponding to the terrestrial broadcasting area and the radio wave transmitting area until a predetermined upper limit period elapses after the terrestrial wave is recently received by the terrestrial receiving unit. The radio-controlled clock according to claim 1, wherein the radio-controlled clock is the target of capture.
<Claim 3>
Equipped with an operation reception unit that accepts user operations
The operation accepted by the operation reception unit includes switching to a transmission / reception prohibition mode for prohibiting an operation related to transmission / reception of a predetermined radio wave.
The control unit according to claim 1 or 2, wherein the control unit excludes the regional positioning satellite, which is the acquisition target, from the acquisition target when the transmission / reception prohibition mode is switched. Radio clock.
<Claim 4>
The radio-controlled timepiece according to any one of claims 1 to 3, wherein the terrestrial wave includes a standard radio wave in a long wavelength band including date and time information.
<Claim 5>
The radio-controlled timepiece according to claim 4, wherein the presence or absence of reception of the standard radio wave is determined by whether or not the detection of the head position of each code transmitted in the standard radio wave is successful.
<Claim 6>
It is a radio wave reception control method of a radio clock including a satellite radio wave receiving unit that receives radio waves from a positioning satellite and a terrestrial radio wave receiving unit that receives terrestrial waves transmitted to a specific broadcasting area.
The satellite radio wave receiving unit receives radio waves from a regional positioning satellite that locally transmits radio waves to the radio wave transmitting area corresponding to the broadcasting area of the terrestrial broadcasting received by the terrestrial broadcasting unit. A radio wave reception control method including a capture target setting step for performing.
<Claim 7>
A computer of a radio-controlled clock equipped with a satellite radio wave receiving unit that receives radio waves from a positioning satellite and a terrestrial radio wave receiving unit that receives terrestrial waves transmitted to a specific broadcasting area.
The satellite radio wave receiving unit receives radio waves from a regional positioning satellite that locally transmits radio waves to the radio wave transmitting area corresponding to the broadcasting area of the terrestrial broadcasting received by the terrestrial broadcasting unit. A program characterized by functioning as a capture target setting means for performing.

1 Radio clock 40 Microcomputer 41 CPU
42 ROM
421 Program 43 RAM
431 Michibiki reception flag 432 Second synchronization OK flag 433 Date and time acquisition success flag 434 Local time setting 46 Oscillation circuit 47 Dividing circuit 48 Time clock 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 621 Guideline 622 Stepping motor 623 Drive circuit 63 Standard radio wave reception unit 64 Light intensity sensor 70 Power supply unit 71 Battery A1 Antenna A2 Antenna

Claims (6)

A satellite radio wave receiver that receives radio waves from positioning satellites,
A terrestrial receiver that receives terrestrial waves transmitted to a specific broadcasting area,
The satellite radio wave receiving unit receives radio waves from a regional positioning satellite that locally transmits radio waves to the radio wave transmitting area corresponding to the broadcasting area of the terrestrial broadcasting received by the terrestrial broadcasting unit. And the control unit that lets you do
The operation reception unit that accepts user operations and
With
The operation accepted by the operation reception unit includes switching to a transmission / reception prohibition mode for prohibiting an operation related to transmission / reception of a predetermined radio wave.
When the transmission / reception prohibition mode is switched, the control unit excludes radio waves from the regional positioning satellite, which is the acquisition target, from the acquisition target.
After excluding the regional positioning satellite that is the capture target from the capture target, when the terrestrial receiving unit receives the terrestrial wave, the radio wave from the regional positioning satellite is returned to the capture target. Radio clock. Wherein, during the time between the said received terrestrial by terrestrial receiver unit in the immediate vicinity to the predetermined upper limit time period has elapsed, the broadcast area and radio wave transmission area of the terrestrial is from the corresponding local positioning satellite The radio clock according to claim 1, wherein the radio wave is targeted for capture. The radio clock according to claim 1 or 2 , wherein the terrestrial wave includes a standard radio wave in a long wavelength band including date and time information. The radio-controlled timepiece according to claim 3 , wherein the presence or absence of reception of the standard radio wave is determined by whether or not the detection of the head position of each code transmitted in the standard radio wave is successful. Radio waves of a radio clock including a satellite radio wave receiving unit that receives radio waves from a positioning satellite, a terrestrial wave receiving unit that receives terrestrial waves transmitted to a specific broadcasting area, and an operation receiving unit that accepts user operations. It is a reception control method
The satellite radio wave receiving unit receives radio waves from a regional positioning satellite that locally transmits radio waves to the radio wave transmitting area corresponding to the broadcasting area of the terrestrial broadcasting received by the terrestrial broadcasting unit. Capture target setting step,
When the operation receiving unit switches to the transmission / reception prohibition mode that prohibits the operation related to the transmission / reception of a predetermined radio wave, the radio wave from the regional positioning satellite that is the target of acquisition is used. Steps to exclude from capture,
A step of excluding the regional positioning satellite that is the capture target from the capture target and then returning the radio wave from the regional positioning satellite to the capture target when the terrestrial receiving unit receives the terrestrial wave.
A radio wave reception control method comprising. A computer of a radio-controlled clock including a satellite radio wave receiving unit that receives radio waves from a positioning satellite, a terrestrial wave receiving unit that receives terrestrial waves transmitted to a specific broadcasting area, and an operation receiving unit that accepts user operations. ,
The satellite radio wave receiving unit receives radio waves from a regional positioning satellite that locally transmits radio waves to the radio wave transmitting area corresponding to the broadcasting area of the terrestrial broadcasting received by the terrestrial broadcasting unit. Capture target setting means,
When the operation receiving unit switches to the transmission / reception prohibition mode that prohibits the operation related to the transmission / reception of a predetermined radio wave, the radio wave from the regional positioning satellite that is the target of acquisition is used. Exclusion means to exclude from capture target,
A resetting means for returning the radio wave from the regional positioning satellite to the capture target when the terrestrial receiving unit receives the terrestrial wave after excluding the regional positioning satellite that is the capture target from the capture target. ,
A program characterized by functioning as.

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