JP2019163997A - Satellite signal receiving device, electronic equipment and satellite signal receiving device control method - Google Patents

Abstract

To provide a satellite signal receiving device, electronic equipment, and a satellite signal receiving device control method each of which allows for suppression of power consumption thereof, and allows for increase of the number of satellites capable of acquiring satellite signals.SOLUTION: The satellite signal receiving device comprises: a reception unit; and control unit that controls an action of a correlation computation processing unit. When the control unit causes a reception signal storage unit with the reception unit put into an action state to store a reception signal in an amount of a prescribed period, the control unit can implement: first control mode for, with the reception unit put into the action state and the correlation computation processing unit put into an action state, detecting a satellite signal; and a second control mode for, with the reception unit and the correlation computation processing unit put into the action state, implementing detection processing of computing a correlation value between the reception signal and a code, and detecting the satellite signal, and tracking processing of implementing tracking of the detected satellite signal and acquiring information on the basis of the tracked satellite signal. The control unit implements the first control mode when a first condition is met, and the second control mode when a second condition is met.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a satellite signal receiving device that receives a satellite signal, an electronic device, and a control method for the satellite signal receiving device.

There is known a satellite signal receiving apparatus that receives a satellite signal transmitted from a position information satellite such as a GPS satellite and acquires time information and position information of the current location based on the received satellite signal (see, for example, Patent Document 1). ).
The satellite signal receiving device of Patent Document 1 includes a receiving unit that receives a satellite signal and outputs the received signal, a received signal storage unit that stores the received signal, and a correlation value of the code corresponding to the received signal and the position information satellite. A correlation calculation processing unit for calculating, and a control unit for controlling operations of the reception unit and the correlation calculation processing unit.
The control unit controls the first mode at the start of the reception process, switches to the second mode when the predetermined condition is met when the first mode is set, and controls the first mode when the predetermined condition is met when the second mode is set. Switch to control.
In the first mode, the control unit sets the reception unit in the operating state, sets the correlation calculation processing unit in the non-operation state, stores the reception signal in the reception signal storage unit, and stores the reception signal for a predetermined period. The operation state is set, the correlation calculation processing unit is set to the operation state, and the process of calculating the correlation value of the received signal and the code to detect the satellite signal is executed.
In the second mode, the control unit operates the receiving unit and the correlation calculation processing unit, calculates a correlation value between the received signal and the code, performs a tracking process to track the detected satellite signal, and tracks the tracked satellite. A process of acquiring information based on the signal is executed.

JP 2017-167045 A

  The satellite signal receiving apparatus of Patent Document 1 does not search for a new satellite during parallel operation, and thus has a problem that the number of satellites from which satellite signals can be acquired is reduced. For this reason, for example, when collecting satellite navigation information, information on valid satellites that have not been detected in the first mode but have moved to a detectable position in the second mode may not be collected. Also, when positioning, the positioning success rate may be low if only the tracking satellite is used.

  An object of the present invention is to provide a satellite signal receiving device, an electronic device, and a control method for the satellite signal receiving device that can increase the number of satellites from which satellite signals can be acquired.

  The satellite signal receiving device of the present invention includes a receiving unit that receives radio waves in a frequency band of a satellite signal transmitted by a position information satellite, outputs a received signal, a received signal storage unit that stores the received signal, and the received signal And a correlation calculation processing unit that calculates a correlation value of a code corresponding to the position information satellite, and a control unit that controls operations of the reception unit and the correlation calculation processing unit, and the control unit includes the reception unit And the correlation calculation processing unit is set to an inoperative state, the reception signal output from the reception unit is stored in the reception signal storage unit, and the reception signal for a predetermined period is stored in the reception signal storage And storing the reception unit in the non-operating state and the correlation calculation processing unit in the operating state, calculating the correlation value of the reception signal and the code stored in the reception signal storage unit, A first control mode for executing a first detection process for detecting a satellite signal; and a correlation value of the received signal and the code output from the receiving unit with the receiving unit and the correlation calculation processing unit as operating states The second detection process for detecting the satellite signal and the tracking process for tracking the satellite signal detected in the first detection process and the second detection process are performed and tracked. A second control mode for acquiring information based on the satellite signal, and the first control mode is executed when a preset first condition is met, and the preset second condition is met Then, the second control mode is executed.

According to the present invention, the control unit can control the reception unit and the correlation calculation processing unit in the first control mode and the second control mode.
When the first condition is satisfied, the control unit executes the first control mode and performs the first detection process.
When the second condition is satisfied, the control unit executes the second control mode and performs the second detection process. As the second condition, for example, a condition for determining that information acquisition can be successfully performed when tracking processing for tracking a satellite signal in the second control mode is set. For example, when the reception process is executed in the positioning mode, the second condition can be set when three or more satellite signals can be detected. In the case of the date and time synchronization mode or the satellite navigation information collection mode, the satellite that can be tracked Therefore, the second condition can be set when one or more satellite signals are detected.
When the second control mode is executed in accordance with the second condition, the control unit operates the reception unit and the correlation calculation processing unit to calculate the correlation value of the received signal and the code, and calculates the satellite signal. A detection process to detect and a tracking process to track the satellite signal detected by the detection process are executed. Then, based on the tracked satellite signal, information such as time information and position information is acquired.
At this time, in the second control mode, since a detection process for detecting a new satellite signal is performed, even a satellite signal that could not be detected when the first control mode was executed is detected when the second control mode is executed. can do. Therefore, in the tracking process in the second control mode, in addition to the satellite signal detected in the first control mode, the satellite signal detected in the detection process in the second control mode can be tracked, so that more satellite signals can be tracked. For this reason, a satellite signal with high signal strength can be received or many satellite signals can be received, so that the probability of successful information acquisition can be improved.

  In the satellite signal receiving device of the present invention, the control unit operates the receiving unit and the correlation calculation processing unit as operating states, calculates a correlation value of the received signal and the code output from the receiving unit, and A third control mode for performing a tracking process for tracking the satellite signal detected in the first detection process and acquiring information based on the tracked satellite signal; When the three conditions are satisfied, it is preferable to execute the third control mode.

  In the third control mode, only the satellite signal detected in the first control mode is tracked and no new satellite detection process is performed, so that power consumption can be reduced compared to the second control mode. Therefore, by selecting and executing the first control mode, the second control mode, and the third control mode, the control unit can suppress power consumption and increase the number of satellites from which satellite signals can be acquired. In particular, if the first control mode is executed at the start of reception, it is possible to determine whether the environment is such that the satellite signal can be received with minimal power consumption, and it is possible to appropriately determine the continuation of reception processing. In addition, since it is possible to select and execute the second control mode and the third control mode, according to the type of information to be acquired, etc., high-accuracy reception processing with increased position accuracy and reception success rate by the second control mode, Low power reception processing that can reduce power consumption in the third control mode can be selected, and necessary information can be acquired with minimal power consumption.

  In the satellite signal receiving device of the present invention, the information is time information, and the control unit is operable in a date and time synchronization mode for acquiring the time information, and when operated in the date and time synchronization mode, Start reception processing in the first control mode, determine that the third condition is met when the number of the satellite signals detected in the first control mode is equal to or greater than a predetermined number, and switch to the third control mode It is preferable to execute the reception process.

  In the date and time synchronization mode in which time information is acquired from at least one satellite signal, reception processing is started in the first control mode, and the number of detected satellite signals is equal to or greater than a third predetermined value (for example, the number of satellites is equal to or greater than 1). In this case, the reception process is executed by switching to the third control mode. For this reason, it is possible to determine whether the environment is one in which the satellite signal can be received with minimal power consumption by the first control mode, and a new satellite detection process is performed when acquiring time information by the third control mode. Therefore, time information can be acquired with minimum power consumption.

  In the satellite signal receiving apparatus of the present invention, the information is satellite navigation information, and the control unit is operable in a satellite navigation information collection mode for acquiring the satellite navigation information, and operates in the satellite navigation information collection mode. If it is, start the reception process in the first control mode, determine that the second condition is met when the number of the satellite signals detected in the first control mode is a predetermined number or more, It is preferable to switch to the second control mode and execute the reception process.

  In the satellite navigation information collection mode, it is desirable to collect satellite navigation information including orbit information (ephemeris) from as many satellites as possible. In the present invention, the reception process is started in the first control mode, and when the number of detected satellite signals is equal to or greater than a second predetermined value (for example, the number of satellites is equal to or greater than 1), the reception process is switched to the second control mode. Is running. For this reason, it is possible to determine whether the environment can receive satellite signals with minimal power consumption by the first control mode, and newly detect satellites that could not be detected in the first control mode by the second control mode. Navigation information of many satellites can be acquired. In addition, since it is confirmed whether the environment is such that the satellite can be detected in the first control mode at the start of reception, power consumption when the satellite cannot be detected is reduced compared to when the reception process is started in the second control mode. it can. Therefore, a large amount of satellite navigation information can be acquired while suppressing power consumption.

  In the satellite signal receiving device of the present invention, the information is position information, and the control unit is operable in a positioning mode for acquiring the position information. When operated in the positioning mode, If it can be activated, it is preferable to execute the reception process in the second control mode.

Here, “startable by hot start” means that the receiving circuit can be started in a state in which the current time information, initial position information, and the number of valid ephemeris information (three or more) that can be measured are grasped. means. For example, when the valid period of the ephemeris information is about 4 hours, it is a state where three or more pieces of ephemeris information acquired within 4 hours are grasped.
According to the present invention, since it can be activated by hot start, the search range during the satellite signal detection process can be limited, and the time for decoding the satellite navigation information is not required, so that the position information can be acquired in a short time. In addition, since the satellite navigation information is known, it is not necessary to set the level of the received satellite signal to a high level at which the satellite navigation information can be decoded, and position information can be acquired even using a weaker level satellite signal. . For this reason, since the search range can be narrowed, the search power for setting how many searches are performed per unit time can be reduced, and the power consumption can be reduced. For this reason, it is possible to acquire position information while suppressing power consumption without executing the first control mode at the start of reception. When the second control mode is executed without executing the first control mode, there is no satellite signal detected by the first detection process. For this reason, the tracking process in the second control mode tracks only the satellite signal detected in the second detection process.

  In the satellite signal receiving device of the present invention, the information is position information, and the control unit is operable in a positioning mode for acquiring the position information and is operated in the positioning mode, and is a hot start. In the first control mode, the number of the satellite signals detected in the first control mode is equal to or greater than the number of satellites necessary for positioning. In this case, it is preferable to determine that the second condition is satisfied, and switch to the second control mode to execute the reception process.

  According to the present invention, when hot start cannot be performed, that is, during cold start, reception processing is started in the first control mode, and the number of satellite signals detected in the first control mode is equal to the number of satellites necessary for positioning ( If it is 3 or more, for example, the reception process is continued by switching to the second control mode. For this reason, since satellites that could not be detected in the first control mode can also be detected in the second control mode, the satellites that can be detected in the first control mode and the second control mode can be tracked, and more satellite signals can be detected. Can be obtained. For this reason, since the probability that position information can be acquired using a satellite signal with a high signal level is also increased, the positioning success rate can be improved, and highly accurate position information can be acquired.

  In the satellite signal receiving device of the present invention, the information is position information, and the control unit is operable in a positioning mode for acquiring the position information and is operated in the positioning mode, and is a hot start. In the first control mode, the number of the satellite signals detected in the first control mode is equal to or greater than the number of satellites required for positioning. In this case, it is preferable to determine that the third condition is satisfied and switch to the third control mode to execute the reception process.

  According to the present invention, when hot start cannot be performed, that is, during cold start, reception processing is started in the first control mode, and the number of satellite signals detected in the first control mode is equal to the number of satellites necessary for positioning ( (For example, 3 or more), the reception process is continued by switching to the third control mode. In the third control mode, since only the satellites detected in the first control mode are tracked, power consumption can be reduced compared to the case where the second control mode is executed. For this reason, position information can be acquired, suppressing power consumption.

  In the satellite signal receiving device of the present invention, the control unit includes a sensitivity range for performing the first detection process, a sensitivity range for performing the second detection process, and an ability to perform the first detection process. It is preferable that the second detection processing can be set.

  According to the present invention, the sensitivity range setting (search target sensitivity setting) and the ability to perform detection processing are set according to the type of information to be acquired, the reception conditions (at the time of hot start or cold start), etc. Search power setting) can be performed, so that necessary information can be acquired while further reducing power consumption.

An electronic apparatus according to the present invention includes the satellite signal receiving device.
Also in the electronic apparatus of the present invention, it is possible to obtain the same operational effects as the invention of the satellite signal receiving apparatus.

The present invention includes a receiving unit that receives radio waves in a frequency band of a satellite signal transmitted by a position information satellite and outputs a received signal, a received signal storage unit that stores the received signal, the received signal, and the position information satellite A correlation calculation processing unit that calculates a correlation value of a code corresponding to the above, a control method of a satellite signal receiving device, wherein the reception unit is in an operating state, and the correlation calculation processing unit is in an inoperative state, When the reception signal output from the reception unit is stored in the reception signal storage unit, and the reception signal for a predetermined period is stored in the reception signal storage unit, the reception unit is in an inoperative state, and A first control process for executing a first detection process for detecting the satellite signal by calculating a correlation value of the received signal and the code stored in the received signal storage unit with the correlation calculation processing unit in an operating state. And second detection processing for detecting the satellite signal by calculating the correlation value of the received signal and the code output from the receiving unit with the receiving unit and the correlation calculation processing unit in an operating state. And a second control step for performing tracking processing for tracking the satellite signal detected in the first detection processing and the second detection processing, and acquiring information based on the tracked satellite signal; The first control step is executed when a preset first condition is met, and the second control step is executed when a preset second condition is met.
Also in the control method of the satellite signal receiving apparatus of the present invention, it is possible to obtain the same effect as the invention of the satellite signal receiving apparatus.

Schematic which shows the electronic timepiece of embodiment which concerns on this invention. The front view of the electronic timepiece in the embodiment. Sectional drawing of the electronic timepiece in the said embodiment. The block diagram which shows the circuit structure of the electronic timepiece in the said embodiment. The figure which shows the data structure of the memory | storage device in the said embodiment. The figure which shows the structure of the main frame of a navigation message. The figure which shows the structure of the TLM word of a navigation message. The figure which shows the structure of the HOW word of a navigation message. The block diagram which shows the circuit structure of the GNSS receiving circuit in the said embodiment. The flowchart which shows the reception process in the said embodiment. The flowchart which shows the process of the satellite navigation information collection mode in the said embodiment. The flowchart which shows the satellite signal search process in the said embodiment. The flowchart which shows the signal detection process in the said embodiment. The flowchart which shows the reception process of the parallel operation mode in the said embodiment. The flowchart which shows the decoding, date synchronization, and positioning process in the said embodiment. The flowchart which shows the process of the date synchronous mode in the said embodiment. The flowchart which shows the process of the positioning mode in the said embodiment. The flowchart which shows the process of the positioning mode (cold start) in the said embodiment. The flowchart which shows the high precision reception process in the positioning mode (cold start) in the said embodiment. The flowchart which shows the low power reception process in the positioning mode (cold start) in the embodiment.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing an electronic timepiece 1 of the present embodiment.
An electronic timepiece 1 as an electronic device acquires time information by receiving a satellite signal from at least one position information satellite 100 among a plurality of position information satellites 100 orbiting the earth in a predetermined orbit. , Receiving satellite signals from at least three position information satellites 100 to calculate and acquire the position information. The position information satellites 100 are position information satellites used in GNSS (Global Navigation Satellite System) such as GPS satellites, and a plurality of position information satellites 100 exist over the earth.

[Schematic configuration of electronic watch]
FIG. 2 is a front view of the electronic timepiece 1, and FIG. 3 is a cross-sectional view showing an outline of the electronic timepiece 1.
As shown in FIGS. 2 and 3, the electronic timepiece 1 includes an exterior case 30, a cover glass 33, and a back cover 34. The exterior case 30 is configured by fitting a bezel 32 made of ceramic to a cylindrical case 31 made of metal. On the inner peripheral side of the bezel 32, a disk-shaped dial plate 11 is disposed as a time display portion via a ring-shaped dial ring 35 formed of plastic.
From the center of the dial 11, an A button 2 is provided at a position at 2 o'clock, a B button 3 is provided at a position at 4 o'clock, and a crown 4 is provided at a position at 3 o'clock. Yes.

In the electronic timepiece 1, as shown in FIG. 3, the opening on the front surface side of the two openings of the metal case 31 is closed by the cover glass 33 via the bezel 32, and the opening on the back surface side is It is closed by a back cover 34 made of metal.
Inside the outer case 30, a dial ring 35 attached to the inner periphery of the bezel 32, a light-transmitting dial 11, the hands 21 to 28, the calendar wheel 20, the hands 21 to 28 and the calendar A drive mechanism 140 for driving the vehicle 20 is provided.

  The dial ring 35 has an outer peripheral end that is in contact with the inner peripheral surface of the bezel 32, a flat plate portion that is parallel to the cover glass 33, and an inner peripheral end that is in contact with the dial 11. An inclined portion inclined toward the plate 11 side is provided. The dial ring 35 has a ring shape in a plan view and a mortar shape in a cross-sectional view. A donut-shaped storage space is formed by the flat plate portion of the dial ring 35, the inclined portion, and the inner peripheral surface of the bezel 32, and the ring-shaped antenna body 110 is stored in the storage space.

The dial 11 is a circular plate that displays the time inside the outer case 30, is formed of a light-transmitting material such as plastic, and includes dials 21 to 28 between the cover glass 33 and the dial ring. 35 is disposed inside.
A solar cell 135 that performs photovoltaic power generation is provided between the dial plate 11 and the ground plate 125 to which the drive mechanism 140 is attached. The solar cell 135 is a circular flat plate in which a plurality of photovoltaic elements that convert light energy into electrical energy are connected in series. The dial plate 11, the solar cell 135, and the ground plate 125 are formed with holes through which the pointer shafts 29 of the pointers 21 to 23 and the pointer shafts (not shown) of the hands 24 to 28 pass. Further, the dial 11 and the solar cell 135 are formed with openings of the calendar small windows 15.

The drive mechanism 140 is attached to the ground plane 125 and is covered with the circuit board 120 from the back side. The drive mechanism 140 has a step motor and a wheel train such as a gear, and the step motor drives each pointer by rotating the pointer shaft 29 and the like through the wheel train.
Specifically, the drive mechanism 140 includes first to sixth drive mechanisms. The first drive mechanism drives the hands 22 and 23, the second drive mechanism drives the hands 21, the third drive mechanism drives the hands 24, the fourth drive mechanism drives the hands 25, and the fifth drive. The mechanism drives the hands 26 to 28, and the sixth drive mechanism drives the calendar wheel 20.

  The circuit board 120 includes a GNSS receiving circuit 45, a control circuit 50, and a storage device 60. Further, the circuit board 120 and the antenna body 110 are connected by using antenna connection pins 115. On the back cover 34 side of the circuit board 120 on which the GNSS receiving circuit 45, the control circuit 50, and the storage device 60 are provided, a circuit holder 122 for covering these circuit components is provided. A secondary battery 130 such as a lithium ion battery is provided between the ground plate 125 and the back cover 34. The secondary battery 130 is charged with electric power generated by the solar cell 135.

[Electronic watch display mechanism]
On the inner peripheral side of the dial ring 35 that surrounds the outer peripheral portion of the dial plate 11, a scale that divides the inner periphery into 60 divisions is shown as shown in FIG. Using this scale, the hand 21 displays “second” of the first time at normal time, the hand 22 displays “minute” of the first time, and the hand 23 displays “hour” of the first time. Since the “second” of the first time is the same as the “second” of the second time described later, the user can grasp the “second” of the second time by checking the pointer 21.
The dial ring 35 has an alphabet “Y” at the 12-minute position and an alphabet “N” at the 18-minute position. The letters indicate reception (acquisition) results (Y: reception (acquisition) success, N: reception (acquisition) failure) of various information based on the satellite signal received from the position information satellite 100. The pointer 21 indicates either “Y” or “N” and displays the reception result of the satellite signal. The reception result is displayed by pressing the A button 2 for less than 3 seconds.

  The pointer 24 is provided at a position in the 2 o'clock direction from the center of the dial 11. The letters “S”, “M”, “T”, “W”, “T”, “F”, and “S” indicating seven days are written on the outer periphery of the rotation area of the pointer 24. The pointer 24 displays the day of the week by instructing one of “S” to “S”.

The pointer 25 is provided at a position in the 10 o'clock direction from the center of the dial 11. Hereinafter, the notation of the outer periphery of the rotation region of the pointer 25 will be described. The “n hour direction” (n is an arbitrary natural number) is the direction when the outer periphery of the rotation region is viewed from the pointer axis of the pointer 25. .
On the outer periphery of the range of rotation of the pointer 25 from the 6 o'clock direction to the 7 o'clock direction, an English letter “DST” and a symbol “◯” are written. DST (daylight saving time) means daylight saving time. The pointer 25 indicates the setting of daylight saving time (DST: daylight saving time ON, ○: daylight saving time OFF) by indicating these letters and symbols.

  On the outer periphery of the rotation region of the pointer 25 from the 8 o'clock direction to the 9 o'clock direction, there is a crescent-shaped symbol 12 having a thick base end in the 9 o'clock direction and a thin tip in the 8 o'clock direction along the circumference. It is written. This symbol 12 is a power indicator of the secondary battery 130 (see FIG. 3), and the remaining battery level is displayed when the pointer 25 indicates a position corresponding to the remaining battery level. The pointer 25 indicates the symbol 12 at normal times.

  An airplane-shaped symbol 13 is written on the outer periphery of the rotation region of the pointer 25 in the 10 o'clock direction. This symbol represents the airplane mode. When aircraft take off and landing, the reception of satellite signals is prohibited by the Aviation Law. The pointer 25 indicates that the in-flight mode is set and no reception is performed by designating the symbol 13.

  A number “1” and a symbol “4+” are written on the outer periphery of the rotation region of the pointer 25 from the 11 o'clock direction to the 12 o'clock direction. These numbers and symbols represent satellite signal reception modes. “1” means a date and time synchronization mode (time measurement mode) in which time information is received and the internal time is corrected. “4+” means a positioning mode that receives time information and orbit information, calculates position information that is the current position, and corrects the internal time and time zone data described later.

The hands 26 and 27 are provided at a position in the 6 o'clock direction from the center of the dial 11. The hand 26 displays “minute” of the second time, and the hand 27 displays “hour” of the second time.
The pointer 28 is provided at a position in the 4 o'clock direction from the center of the dial 11 and displays the morning and afternoon of the second time.
The calendar small window 15 is provided in the opening part which opened the dial 11 in the rectangular shape, and the number printed on the calendar wheel 20 can be visually recognized from the opening part. This number represents the “day” of the date.

Also, on the dial ring 35, time difference information 37 representing a time difference with Coordinated Universal Time (UTC) is indicated by numerals and symbols other than numbers along the inner scale. The numerical time difference information 37 represents an integer time difference, and the symbol time difference information 37 represents a time difference other than an integer. The time difference between the first time displayed by the hands 21 to 23 and UTC can be confirmed by the time difference information 37 indicated by the hand 21 by pressing the B button 3.
Further, the bezel 32 provided around the dial ring 35 includes city information 36 representing the representative city name of the time zone using the standard time corresponding to the time difference of the time difference information 37 written on the dial ring 35. Is also written in the time difference information 37.

[Circuit configuration of electronic watch]
FIG. 4 is a block diagram showing a circuit configuration of the electronic timepiece 1. As shown in FIG. 4, the electronic timepiece 1 is a solar power generation rechargeable GNSS compatible wristwatch type device. The electronic timepiece 1 includes an antenna body 110, a GNSS receiving circuit 45, a timing device 46, a storage device 60, an input device 47, a control circuit 50, a driving mechanism 140, a display device 141, a solar cell 135, , A charging circuit 131, a secondary battery 130, and a light amount detection circuit 132.
The control circuit 50 includes a reception control unit 51, a time information generation unit 52, a time correction unit 53, and a display control unit 54.
The driving mechanism 140 and the display device 141 constitute a clock display unit that displays time.
The charging circuit 131 supplies power generated in the solar cell 135 to the secondary battery 130 and charges the secondary battery 130.
The light amount detection circuit 132 detects the light amount of light irradiated on the electronic timepiece 1. Since the magnitude of the electric power generated in the solar cell 135 is proportional to the amount of light irradiating the electronic timepiece 1, the light amount detection circuit 132 according to the present embodiment is generated by the solar cell 135 and passed through the charging circuit 131. The amount of power charged in the secondary battery 130 is detected to detect the amount of light. Note that the light amount detection circuit 132 may be configured by an optical sensor, an ultraviolet sensor, or the like.

The GNSS receiving circuit 45 as a satellite signal receiving device is configured to receive a plurality of types of satellite signals used in GNSS such as GPS and GLONASS. The GNSS receiving circuit 45 is connected to the antenna body 110 and processes satellite signals received via the antenna body 110 to acquire time information and position information.
Details of the GNSS receiving circuit 45 will be described later. In the following description, a case where a satellite signal is received from a GPS satellite as the position information satellite 100 will be described as an example.

  The input device 47 includes the A button 2, the B button 3, and the crown 4 shown in FIG. 2, and executes various processes based on the pressing and releasing of the buttons 2 and 3 and the pulling and pushing of the crown 4. An operation to be instructed is detected, and an operation signal corresponding to the detected operation is output to the control circuit 50.

The display device 141 includes the dial plate 11, the dial ring 35, the bezel 32, the hands 21 to 28, and the calendar wheel 20 shown in FIG.
The time measuring device 46 includes a crystal resonator driven by the electric power stored in the secondary battery 130, and updates time data using a reference signal based on an oscillation signal of the crystal resonator.

The storage device 60 includes a RAM (Random Access Memory) and a ROM (Read Only Memory), and includes a time data storage unit 610 and a time zone data storage unit 620 as shown in FIG.
The time data storage unit 610 includes reception time data 611, leap second update data 612, internal time data 613, first display time data 614, second display time data 615, and first time zone data. 616 and second time zone data 617 are stored.
The reception time data 611 stores time information (GPS time) acquired from satellite signals. The reception time data 611 is normally updated every second by the timing device 46, and when the satellite signal is received, the acquired time information (GPS time) is stored.
The leap second update data 612 stores at least current leap second data. That is, in subframe 4 and page 18 of the satellite signal, “current leap second”, “leap second update week”, “leap second update date”, and “leap second after update” are included as data relating to leap seconds. Each data is included. Among these, in the present embodiment, at least “current leap second” data is stored in the leap second update data 612.

  Internal time information is stored in the internal time data 613. This internal time information is updated by the GPS time stored in the reception time data 611 and the “current leap second” stored in the leap second update data 612. That is, the internal time data 613 stores UTC (Coordinated Universal Time). When the reception time data 611 is updated by the timing device 46, the internal time information is also updated.

The first display time data 614 stores time information obtained by adding the time zone data (time difference information) of the first time zone data 616 to the internal time information of the internal time data 613. The first time zone data 616 is set as time zone data obtained when the user manually selects or receives in the positioning mode. Here, the time information of the first display time data 614 corresponds to the first time displayed by the hands 21 to 23.
The second display time data 615 stores time information obtained by adding the time zone data of the second time zone data 617 to the internal time information of the internal time data 613. The second time zone data 617 is set as time zone data obtained when the user manually selects. Here, the time information of the second display time data 615 corresponds to the second time displayed by the hands 21, 26 to 28.

  The time zone data storage unit 620 stores position information and time zone data (time difference information) in association with each other. For this reason, when the position information is acquired in the positioning mode, the control circuit 50 can acquire the time zone data based on the position information.

  The time zone data storage unit 620 further stores a city name and time zone data in association with each other. Therefore, when the user selects a city name for which the local time is desired by operating the crown 4, the control circuit 50 searches the time zone data storage unit 620 for the city name set by the user and corresponds to the city name. Time zone data to be acquired is acquired and set in the first time zone data 616 or the second time zone data 617.

  The control circuit 50 includes a CPU that controls the electronic timepiece 1. The control circuit 50 functions as a reception control unit 51, a time information generation unit 52, a time correction unit 53, and a display control unit 54 by executing various programs stored in the storage device 60.

The reception control unit 51 operates the GNSS reception circuit 45 to execute reception processing when a reception condition that is a condition for executing reception is met. In the present embodiment, the reception control unit 51 includes a satellite navigation information collection mode for collecting satellite navigation information, a date / time synchronization mode for acquiring and correcting time information, and a positioning mode for calculating and acquiring position information. It is configured to be capable of operating different types of reception modes.
For example, if the reception control unit 51 corresponds to a preset time, the reception control unit 51 determines that the reception condition of the date / time synchronization mode is satisfied, and operates the GNSS reception circuit 45. In addition, the reception control unit 51 determines that the reception condition of the satellite navigation information collection mode is satisfied at regular time intervals (for example, every 4 hours), and operates the GNSS reception circuit 45.
Furthermore, when the reception control unit 51 detects that the A button 2 is pressed for 3 seconds or more and less than 6 seconds based on the output signal of the input device 47, the reception control unit 51 operates the GNSS reception circuit 45 to receive data in the date and time synchronization mode. Execute the process. Further, when it is detected that the A button 2 has been pressed for 6 seconds or longer, the GNSS receiving circuit 45 is operated to execute the receiving process in the positioning mode.
As will be described in detail later, when the reception process in the date / time synchronization mode is executed, the GNSS reception circuit 45 captures at least one position information satellite 100 and receives a satellite signal transmitted from the position information satellite 100. Time information.
When the reception process in the positioning mode is executed, the GNSS receiving circuit 45 captures at least three, preferably four or more position information satellites 100, and receives satellite signals transmitted from each position information satellite 100. The position information is calculated and acquired. Further, the GNSS receiving circuit 45 can simultaneously acquire time information when receiving a satellite signal.
That is, the reception control unit 51 controls the GNSS reception circuit 45 when performing a periodic reception process or when a reception process by a user operation is instructed, and performs a date and time synchronization mode, a positioning mode, Implement each process in the satellite navigation information collection mode.

The time information generation unit 52 generates time information from the information acquired by the GNSS reception circuit 45 and stores the time information as reception time data 611 in the storage device 60. Further, the received data is updated by using a reference clock generated by a crystal resonator built in the time measuring device 46. Furthermore, the time information generation unit 52 sets time zone data based on the acquired position information when the position information is successfully acquired in the reception process in the positioning mode. Specifically, the time zone data corresponding to the position information is selected and acquired from the time zone data storage unit 620 and stored in the first time zone data 616.
For example, since Japan Standard Time (JST) is a time (UTC + 9) that is 9 hours ahead of UTC, when the acquired position information is Japan, the time information generation unit 52 includes the time zone data storage unit 620. The time difference information (+9 hours) in Japan standard time is read out from the first time zone data 616 and stored.
In addition, when either the time difference information 37 or the city information 36 is selected by the operation of the input device 47, the time information generation unit 52 displays time zone data corresponding to the selected time difference information 37 or the city information 36, The first time zone data 616 or the second time zone data 617 is stored.

The time correction unit 53 stores the acquired time information in the reception time data 611 when the time information is successfully acquired in the reception process in the date / time synchronization mode or the positioning mode. Thereby, the internal time data 613, the first display time data 614, and the second display time data 615 are corrected.
The time correction unit 53 corrects the first display time data 614 using the first time zone data 616 and corrects the second display time data 615 using the second time zone data 617. Therefore, the first display time data 614 and the second display time data 615 are times obtained by adding each time zone data to the internal time data 613 that is UTC.

  The display control unit 54 controls the drive mechanism 140 to display the time information of the first display time data 614 on the hands 21 to 23, and controls the time information of the second display time data 615 to the drive mechanism 140. And displayed on the hands 26-28.

[Navigation message]
GNSS such as GPS broadcasts satellite navigation information (navigation message) on a transmitted signal. Here, a navigation message (satellite navigation information) that is a satellite signal transmitted from the position information satellite 100 will be described using GPS as an example. The GPS navigation message is modulated into satellite radio waves as 50 bps data.
6 to 8 are diagrams for explaining a configuration of a GPS navigation message.
As shown in FIG. 6, the navigation message is configured as data in which a main frame having a total number of 1500 bits is used as one unit. The main frame is divided into five sub-frames 1 to 5 each having 300 bits. Data of one subframe is transmitted from each position information satellite (GPS satellite) 100 in 6 seconds. Accordingly, data of one main frame is transmitted from each GPS satellite 100 in 30 seconds.

Subframe 1 includes week number data (WN: week number) and satellite correction data.
The week number data is information representing a week including the current GPS time information, and is updated on a weekly basis.
The subframes 2 and 3 include ephemeris parameters (detailed orbit information of each GPS satellite 100). The subframes 4 and 5 include almanac parameters (general orbit information of all GPS satellites 100). As for the almanac parameter, the same information is broadcast from any GPS satellite 100 that is tracking. On the other hand, the ephemeris parameter is broadcast only from the tracking GPS satellite 100. If the ephemeris parameters cannot be acquired from the tracking satellite, positioning cannot be performed. In addition, once acquired, the ephemeris parameter can be used for about 4 hours. Therefore, in order to perform continuous positioning, it is necessary to acquire periodically, for example, every 4 hours.

  Further, in the subframes 1 to 5, TLM word (also referred to as word 1) storing 30-bit TLM (Telemetry word) data and 30-bit HOW (hand over word) data are stored from the top. HOW word (also referred to as word 2) is included.

  Therefore, TLM words and HOW words are transmitted from the GPS satellite 100 at intervals of 6 seconds, whereas week number data, satellite correction data, ephemeris parameters, and almanac parameters are transmitted at intervals of 30 seconds.

  As shown in FIG. 7, the TLM word includes preamble data, a TLM message, reserved bits, and parity data.

  As shown in FIG. 8, the HOW word includes GPS time information called TOW (Time of Week, also referred to as “Z count”). In the Z count data, the elapsed time from 0 o'clock every Sunday is displayed in seconds, and it returns to 0 at 0 o'clock on the next Sunday. That is, the Z count data is information in units of seconds indicated every week from the beginning of the week. This Z count data indicates GPS time information at which the first bit of the next subframe data is transmitted.

Therefore, the electronic timepiece 1 acquires date information and time information by acquiring the week number data included in the subframe 1 and the TLM word and HOW word (Z count data) included in the subframes 1 to 5. Can do. However, when the electronic timepiece 1 has previously acquired week number data and is counting the elapsed time from the time when the week number data was acquired internally, the electronic timepiece 1 does not acquire the week number data. Current week number data can be obtained.
Therefore, the electronic timepiece 1 only needs to acquire the week number data of the subframe 1 only when the week number data (date information) is not stored therein after resetting or when the power is turned on. When the week number data is stored, the electronic timepiece 1 can know the current time by acquiring the TLM word and the HOW word.

[Configuration of GNSS receiver circuit]
FIG. 9 is a block diagram showing a circuit configuration of the GNSS receiving circuit 45.
As shown in FIG. 9, the GNSS receiving circuit 45 includes an RF (Radio Frequency) unit 70 and a baseband unit 80.

[RF part]
The RF unit 70 as a receiving unit receives the radio wave in the frequency band of the satellite signal using the antenna body 110 and outputs a received signal. Specifically, the RF unit 70 mixes an amplification circuit (LNA) that amplifies the received signal, a bandpass filter (BPF) that removes signal components other than the frequency band of the satellite signal from the received signal, and a local oscillation signal. And a processing unit that receives and processes a satellite signal such as a mixer circuit that converts the received signal into a signal of an intermediate frequency band.
The RF unit 70 is provided with a processing unit for each receivable GNSS, and operates a processing unit corresponding to the received GNSS. For example, when four types of GNSS, that is, GPS, Galileo, GLONASS, and Beidou, can be received, the RF unit 70 includes four types of corresponding processing units, and operates a processing unit corresponding to the received GNSS. The type of GNSS to be received may be selected by the user, or may be set so that priority is given to the GNSS in which information acquisition was successful during the previous reception.

[Baseband part]
The baseband unit 80 includes a sampling unit 81, a sample memory unit 82, a replica code generation unit 83, a correlation calculation processing unit 84, and a baseband control unit 85.
The sampling unit 81 includes an analog / digital converter (ADC) and the like, and converts the reception signal output from the RF unit 70 into a digital signal at a predetermined sampling period and outputs the digital signal.
In the sample memory unit 82 as a reception signal storage unit, the reception signal output from the sampling unit 81 is accumulated (stored). Note that the sample memory unit 82 may secure a dedicated area for each type of GNSS, or may be shared by a plurality of types of GNSS, and the size (accumulation size) of received signals that can be stored can be changed. It may be configured. The sample memory unit 82 can be set to a size that can accommodate at least the received GNSS. Further, the sample memory unit 82 may change the size of the received signal when the GNSS receiving circuit 45 is controlled in a first control mode, a second control mode, and a third control mode, which will be described later.
The replica code generation unit 83 generates a replica of the PRN code corresponding to the type of GNSS designated by the baseband control unit 85 and the position information satellite 100 to be received.
The correlation calculation processing unit 84 executes correlation processing for calculating a correlation value between the received signal stored in the sample memory unit 82 and the replica code (also referred to as a code) generated by the replica code generation unit 83.

  The baseband control unit 85 includes a satellite signal detection unit 851, a satellite signal tracking unit 852, a satellite navigation information decoding unit 853, and a time / position information calculation unit 854.

The satellite signal detection unit 851 controls the RF unit 70, the sampling unit 81, and the sample memory unit 82 to receive radio waves, and stores the reception signal converted into digital data by the sampling unit 81 in the sample memory unit 82.
Further, the replica code generation unit 83 and the correlation calculation processing unit 84 are controlled to generate a replica code, calculate a correlation value between the received signal stored in the sample memory unit 82 and the replica code, and detect a satellite signal. The detection process to be executed is executed.

The satellite signal tracking unit 852 controls the RF unit 70, the sampling unit 81, the sample memory unit 82, the replica code generation unit 83, and the correlation calculation processing unit 84 to perform the following processing. That is, a replica code is generated, a correlation value between the received signal stored in the sample memory unit 82 and the replica code is calculated, and a tracking process (tracking) for tracking the detected satellite signal is executed. This process is performed until the target frequency range to be searched is completed.
Here, the satellite signal tracking unit 852 executes the above processing by operating both the RF unit 70 and the correlation calculation processing unit 84 simultaneously.
In order to acquire position information, it is necessary to receive satellite signals for at least 3 frames (18 seconds) for each satellite. If there is no limit on the received signal storage size in the sample memory unit 82, the tracking process can be executed using the received signal stored in the sample memory unit 82 without putting the RF unit 70 in an operating state. However, in reality, when the power consumption, footprint, cost, etc. of the sample memory unit 82 are taken into consideration, the storage size can only be a size that can store a received signal of 1 second at the maximum. The tracking processing is executed by operating both the arithmetic processing units 84.

The satellite navigation information decoding unit 853 decodes the tracked satellite signal.
The time / position information calculation unit 854 calculates and acquires time information and position information based on the decoded data (such as satellite navigation information and code information included in the tracking signal). That is, the time / position information calculation unit 854 acquires time information when operating in the date / time synchronization mode, and acquires time information and position information when operating in the positioning mode.

As will be described in detail later, the baseband controller 85 includes a first control mode (RF / BB independent operation mode), a second control mode (RF / BB parallel operation mode for high-accuracy reception processing), and a third control mode. (RF / BB parallel operation mode for low power reception processing) is selected and executed to control the operations of the RF unit 70 and the correlation calculation processing unit 84. Therefore, the control unit of the present invention is configured by the baseband control unit 85.
Here, in the first control mode (RF / BB independent operation mode), while the data received by the RF unit 70 is stored in the sample memory unit 82, the correlation calculation processing unit 84 is not operated and the RF unit 70 is not operated. After the state is set, the first detection process for detecting the satellite signal by operating the correlation calculation processing unit 84 is performed. That is, the RF unit 70 and the correlation calculation processing unit 84 are switched and operated.
The second control mode (RF / BB parallel operation mode for high-accuracy reception processing) includes a second detection process (search process) in which the RF unit 70 and the baseband unit 80 are operated in parallel to detect satellite signals; It performs satellite signal tracking processing.
In the third control mode (RF / BB parallel operation mode for low power reception processing), the RF unit 70 and the baseband unit 80 are operated in parallel, but the satellite signal detection processing is not performed, and the first detection processing is performed. The tracking processing of the detected satellite signal is performed.

[Receive processing]
Next, reception processing by the reception control unit 51 will be described using the flowcharts of FIGS.
When the reception control unit 51 starts the reception process, as shown in FIG. 10, the GNSS reception circuit 45 is turned on (S1) and the reception mode is confirmed (S2).
The reception control unit 51 determines whether or not the reception mode is the satellite navigation information collection mode (S3). If it is determined “YES” in S3, the reception control unit 51 executes the satellite navigation information collection mode (S4).
When it is determined “NO” in S3, the reception control unit 51 determines whether or not it is the date and time synchronization mode (time measurement mode) (S5). When it is determined “YES” in S5, the reception control unit 51 executes the date / time synchronization mode (S6), and when it is determined “NO” in S5, it executes the positioning mode (S7).
When the process in each mode is completed, the reception control unit 51 turns off the power of the GNSS reception circuit 45 (S8), and ends the reception process.

[Satellite Navigation Information Collection Mode]
The satellite navigation information collection mode is a reception mode for the purpose of periodically collecting and storing information (ephemeris, almanac) mainly on the satellite orbit from the satellite system.
Once acquired, the ephemeris information can be used for about 4 hours. For this reason, periodic ephemeris information needs to be acquired in order to perform continuous positioning. The purpose of this reception mode is to control the GNSS receiving circuit 45 with optimum settings when there is a high probability that ephemeris information can be acquired from a satellite.
When the satellite navigation information collection mode of S4 in FIG. 10 is started, the reception control unit 51 first sets the reception end condition of this mode as shown in FIG. 11 (S11). It is assumed that the reception end condition can be set in combination with factors such as timeout of reception processing, number of acquired ephemeris information (number of satellites), signal strength of the satellite being measured, and the like.
An example of the reception end condition is given below.
(1) Time-out period until transition to RF / BB parallel operation: 10 seconds Even after 10 seconds have elapsed since startup in the RF / BB independent operation mode (first control mode), the RF / BB parallel operation mode (second control mode) is entered. If not, exit this mode.
(2) Timeout period after shifting to RF / BB parallel operation: 30 seconds After shifting from the RF / BB independent operation mode to the RF / BB parallel operation mode, this mode is terminated after 30 seconds.

Next, the reception control unit 51 sets parameters for the RF / BB independent operation mode (S12). The main setting is the transition condition (second condition) from the first control mode (independent operation mode) to the second control mode (parallel operation mode), basically the threshold of the number of satellites found in the search. is there. In the present embodiment, the condition is set that the mode is shifted to the parallel operation mode when at least one satellite is found.
If the threshold of the number of satellites is not exceeded, the RF / BB independent operation mode does not shift to the RF / BB parallel operation mode, so that a GNNS satellite such as a room cannot be seen, and ephemeris information is unlikely to be acquired. In such a case, since the RF / BB parallel operation mode is not carried out unnecessarily, power consumption can be reduced.

Next, the reception control unit 51 sets parameters for various satellite searches (S13). There are various parameters, but typical ones include a sensitivity range for performing a search and an ability to perform a search (search power).
The setting of the sensitivity range for performing the search is the setting of how far the signal intensity is to be searched. For example, it is better to search for a strong signal satellite in a shorter time than to search for a weak signal satellite over time. May be suitable. In the satellite navigation information collection mode, in order to acquire satellite navigation information from the GNSS satellite, the signal level needs to be somewhat strong. For this reason, the sensitivity range is set so as to search up to a somewhat strong signal range.
The search power setting is how much search is performed per unit time. When the power is increased, the target range can be searched earlier, so that the satellite can be found earlier, but the power consumption increases. Conversely, if the power is reduced, the time to find the satellite is delayed, but the power consumption is reduced. In the satellite navigation information collection mode, the normal search power is set.

[Satellite signal search processing]
Next, the reception control unit 51 activates the GNSS reception circuit 45 in the RF / BB independent operation mode (first control mode) (S14). Therefore, one of the first conditions for executing the first control mode is that reception is started in the satellite navigation information collection mode.
Next, the reception control unit 51 executes a satellite signal search process (S15). This satellite signal search process S15 will be described with reference to the flowchart of FIG.
The satellite signal detection unit 851 of the GNSS reception circuit 45 first sets the RF unit 70 to the operating state (S21), and starts receiving satellite signals (S22).
The satellite signal received by the RF unit 70 is A / D converted by the sampling unit 81 of the baseband unit 80 and converted into digital data (S23). The satellite signal data converted into digital data by the sampling unit 81 is accumulated in the sample memory unit 82 (S24).
The satellite signal detector 851 determines whether or not the satellite signal data stored in the sample memory unit 82 has been stored up to a preset capacity (S25). Since the data capacity stored in the sample memory unit 82 is proportional to the time from the start of reception, the satellite signal detection unit 851 determines whether or not data has been stored up to the set capacity in the sample memory unit 82 in S25. By determining, it can be determined whether or not the received signal for a predetermined period is stored in the sample memory unit 82.

Here, in the RF / BB parallel operation mode (second control mode and third control mode), the reception processing in the RF unit 70 and the correlation calculation processing in the baseband unit 80 are operated in parallel. 82 is sequentially updated to the latest state, and the capacity required for the sample memory unit 82 can be made relatively small.
On the other hand, in the RF / BB independent operation mode (first control mode), only the data stored in the sample memory unit 82 during the operation of the RF unit 70 is used to stop the RF unit 70 during the correlation calculation process. It will be. Therefore, in the RF / BB independent operation mode, the contents of the sample memory unit 82 are held until the correlation calculation process is completed.
Therefore, it is preferable that the set capacity of the satellite signal data stored in the sample memory unit 82 in the RF / BB independent operation mode is set larger than that in the RF / BB parallel operation mode.

If the satellite signal detection unit 851 determines NO in S25, the satellite signal detection unit 851 continues the processing of S22 to S25. Further, when the data is accumulated up to the set capacity and it is determined YES in S25, the satellite signal detecting unit 851 determines whether the current operation mode is the RF / BB independent operation mode (S26). When it is determined YES in S26, the satellite signal detection unit 851 sets the RF unit 70 to the non-operation state and stops the reception process (S27).
On the other hand, if the satellite signal detection unit 851 determines NO in S26, that is, if the current operation mode is the RF / BB parallel operation mode, the satellite signal detection unit 851 does not set the RF unit 70 to the non-operation state. Maintain state.

[Signal detection processing]
Next, the satellite signal detection unit 851 reads the data held in the sample memory unit 82 (S28), and performs signal detection processing (S29).
This signal detection process will be described with reference to the flowchart of FIG.
The satellite signal detector 851 first sets the PRN code of the satellite to be detected (S32), and controls the replica code generator 83 to generate a corresponding replica code (S33). The correlation calculation processing unit 84 performs peak detection processing (correlation processing) using the generated replica code (S34).
The satellite signal detection unit 851 determines whether or not a signal peak has been detected in the peak detection process of S34 (S35). As a result, when the signal peak can be detected (YES in S35), the baseband control unit 85 shifts to the satellite tracking state based on the current code and frequency by the satellite signal tracking unit 852 (S36). When the satellite tracking state is entered, since the correct code and frequency are known, the satellite can be tracked with a very small search power, and the search range can be narrowed, resulting in a reduction in power consumption. On the other hand, if the satellite signal detector 851 determines NO in S35, it does not shift to the satellite tracking state.

Next, the satellite signal detector 851 changes the search frequency (S37), and determines whether or not the search for the target frequency range has ended (S38).
If the satellite signal detection unit 851 determines NO in S38, the satellite signal detection unit 851 repeats until the entire frequency range targeted for the processing in S32 to S37 can be searched. When the satellite signal detection unit 851 finishes the search of the target frequency range and determines YES in S38, the satellite signal detection unit 851 finishes the signal detection process and returns to FIG.

  As shown in FIG. 12, when the signal detection process S29 ends, the satellite signal detection unit 851 changes the search target satellite (S30) and determines whether all the target satellites have ended (S31). If the satellite signal detection unit 851 determines NO in S31, the signal detection processing in S28 to S30 is repeated until the signal detection processing for all the search target satellites is completed. When the satellite signal detection unit 851 finishes the signal detection process for all the search target satellites and determines YES in S31, the satellite signal search process ends and the process returns to FIG.

  As shown in FIG. 11, when the satellite signal search process S15 ends, the baseband controller 85 determines whether or not the reception end condition in the RF / BB independent operation mode is satisfied (S16). In this embodiment, if no satellite is found within the preset time-out time (10 seconds) after the start processing of the RF / BB independent operation mode (S14), the satellite signal detection unit 851 determines YES in S16. To end the satellite navigation information collection mode. On the other hand, the satellite signal detection unit 851 determines NO in S16 if one or more satellites are found, or if no satellite is found but the timeout time has not elapsed.

[RF / BB parallel operation mode (second control mode)]
When it is determined NO in S16, the baseband controller 85 determines whether or not the transition condition (second condition) from the RF / BB independent operation mode to the RF / BB parallel operation mode is satisfied (S17). .
In this embodiment, the transition condition is set when one or more satellites are found. Therefore, the baseband control unit 85 repeatedly executes the satellite signal search process S15 until one or more satellite signals can be detected and YES is determined in S17.

If the baseband control unit 85 satisfies the condition for shifting to the parallel operation and determines YES in S17, the baseband control unit 85 executes the reception process in the RF / BB parallel operation mode (S18).
The reception processing in the RF / BB parallel operation mode will be described with reference to the flowchart of FIG.
The baseband control unit 85 sets the RF unit 70 to the operating state and starts the operation in the RF / BB parallel operation mode (S41). Thereby, satellite tracking processing by the satellite signal tracking unit 852 is possible, and satellite navigation information can be continuously acquired (decoded) from the tracking satellite.
Next, the satellite signal detection unit 851 performs search processing for a satellite that is not currently being tracked (S42). In this example, search processing is performed for the satellites that have not been tracked in S15 of FIG. The satellite signal search process S42 basically performs the processes shown in FIGS. At this time, since the satellite signal search process S15 was operating in the RF / BB independent operation mode, YES was determined in S26 of FIG. 12, and the RF unit 70 was set in a non-operating state in S27. On the other hand, since the satellite signal search process S42 operates in the RF / BB parallel operation mode, the satellite signal search process S15 is different from the satellite signal search process S15 in that NO is determined in S26 and the RF unit 70 is not set to the non-operation state. Different.
The satellite signal tracking unit 852 executes the tracking process of the satellite detected in the satellite signal search process S42 (S43).
The reason why the search process is continued in the RF / BB parallel operation mode is that, in the RF / BB independent operation mode, the search process and the tracking process are performed in parallel because the RF unit 70 is set to the non-operation state. It is not possible.

After shifting to the RF / BB parallel operation mode, the normal operation is performed, and the satellite signal detection unit 851 determines whether or not the reception end condition in the RF / BB parallel operation mode is satisfied (S44). In this embodiment, since the timeout of 30 seconds is set in the reception end condition, the satellite signal detection unit 851 determines YES in S44 when 30 seconds have elapsed after shifting to the RF / BB parallel operation mode, and The operation mode reception process ends.
If the satellite signal detection unit 851 determines NO in S44, the satellite signal tracking unit 852 determines whether there is a satellite being tracked (S45). If NO is determined in S45, the process returns to S42, and the satellite signal search process S42 and the satellite signal tracking process S43 are continued.
When there is a satellite being tracked by the satellite signal tracking processing S43, the satellite navigation information decoding unit 853 and the time / position information calculation unit 854 of the baseband control unit 85 perform the satellite navigation information decoding / date / time synchronization / positioning processing. Implement (S46).

[Decode / Synchronize / Positioning]
Next, the decoding / date synchronization / positioning process of S46 will be described based on the flowchart shown in FIG.
First, the satellite navigation information decoding unit 853 decodes the satellite navigation information from the satellite signal received from the tracking satellite (S51). The satellite navigation information decoding unit 853 determines whether or not the satellite navigation information can be decoded (S52). If the satellite navigation information decoding unit 853 can decode the satellite navigation information (YES in S52), the data is not shown in the GNSS receiving circuit 45. Save in the backup memory (S53). The contents of this memory are retained even after the measurement operation is completed, and are used for the positioning operation. On the other hand, when the satellite navigation information decoding unit 853 cannot decode the satellite navigation information (NO in S52), the storage process of S53 is not performed.

  Next, the time / position information calculation unit 854 determines whether the date and time are synchronized from the decoded result (S54). When the date and time are synchronized, that is, when the time information can be acquired (YES in S54), the date and time of the receiver (electronic clock 1) is corrected (S55), and the date and time information (time related information) is stored in the backup memory. Is stored (S56). On the other hand, the time / position information calculation unit 854 does not perform the processing of S55 and S56 when the date and time are not synchronized (NO in S54).

Next, the time / position information calculation unit 854 determines whether or not positioning has been performed by acquiring ephemeris information of three or more satellites from the decoded result (S57). If positioning is possible (YES in S57), the time zone of the receiver (electronic timepiece 1) is corrected from the position information of the positioning result (S58), and positioning information (position information, crystal drift information, etc.) is stored in the backup memory. ) Is saved (S59). On the other hand, the time / position information calculation unit 854 does not perform the processing of S58 and S59 when the positioning is not completed (NO in S57).
In the present embodiment, in the decoding / date / time synchronization / positioning process S46 in the satellite navigation information collection mode, as shown in FIG. 15, the date / time synchronization and time zone correction (positioning operation) are performed following the satellite navigation information decoding process. However, since it is in the satellite navigation information collection mode, only the satellite navigation information decoding process may be performed, and the date / time synchronization and positioning process may not be performed.
When the decoding / date / time synchronization / positioning process shown in FIG. 15 is completed, as shown in FIG. 14, the baseband controller 85 determines whether or not the reception end condition (timeout 30 seconds) is satisfied (S47). If it determines with NO by S47, it will return to S42 and will continue a process. On the other hand, if the baseband control unit 85 determines YES in S47, the parallel operation mode reception process is terminated, the process returns to FIG. 11, and the satellite navigation information collection mode is also terminated.
After completion of the satellite navigation information collection mode, the process returns to FIG. 10, and the reception control unit 51 turns off the power of the GNSS reception circuit 45 (S8), and ends the reception process.

The satellite navigation information collection mode operates in the RF / BB independent operation mode (first control mode) until the satellite navigation information can be acquired, and it is highly possible that the satellite navigation information can be acquired. When a signal of one or more satellites is actually detected, such as when the signal strength of the signal is high, it is not the limited number of satellites as in the RF / BB independent operation mode, but the normal RF / BB parallel operation mode. (Second control mode) is performed. This allows more satellites to be searched and decodes satellite navigation information to reduce useless search processing in environments where satellite navigation information cannot be acquired at all, while reducing unnecessary power consumption. An operation such as acquiring a lot of satellite navigation information can be performed.
The satellite navigation information obtained here can be used for hot start in a “positioning mode” to be described later, and can perform positioning processing with higher speed and efficiency.

[Date / time synchronization (time measurement) mode]
The date / time synchronization mode is a mode for correcting the time and date of the receiver (electronic clock 1) using the time synchronization information and date information decoded from the signal received from the satellite system.
The satellite navigation information shown in FIG. 6 described above includes the timing synchronized with the second and the time information at the head of each of the subframes 1 to 5. In subframe 1, there is information for obtaining the current date. By acquiring these pieces of information, the date and time of the electronic timepiece 1 can be corrected.
The basic operation is the same as the “satellite navigation information collection mode” described above. However, since the time or date information can be obtained if a signal is received from at least one satellite and the satellite navigation information can be decoded, the object can be achieved with a minimum search operation. Therefore, in the date / time synchronization mode, the system is activated in the RF / BB independent operation mode (first control mode), and after shifting to the RF / BB parallel operation mode, only the satellites acquired in the RF / BB independent operation mode, that is, the first detection process. Only the satellite signal detected in is tracked. That is, the date / time synchronization mode RF / BB parallel operation mode is a third control mode in which no new search is performed after the transition.
In addition, when there is no tracking satellite after the RF / BB parallel operation mode shifts, the satellite search operation is performed again by shifting to the independent operation mode.

Specific processing in the date and time synchronization mode S6 as described above will be described based on the flowchart shown in FIG.
When the date and time synchronization mode starts, the reception control unit 51, as shown in FIG. 16, sets the reception end condition setting process S61, the parameter setting process S62 of the RF / BB independent operation mode (first control mode), the satellite search parameter A setting process S63 is executed.
The reception end condition in the date / time synchronization mode is that the timeout time until the transition to the RF / BB parallel operation mode is 15 seconds, and the end condition of the entire processing in the date / time synchronization mode is the timeout time of 60 seconds, or the date and time can be synchronized. And RF / BB independent operation parameter setting and satellite search parameter setting are the same as the processing S12 and S13 in the satellite navigation information collection mode shown in FIG.

Next, the reception control unit 51 performs an activation process S64 of the GNSS reception circuit 45 in the RF / BB independent operation mode. Therefore, one of the first conditions for executing the first control mode is that reception is started in the date / time synchronization mode. Next, the satellite signal detection unit 851 performs a satellite signal search process S65, a reception end condition determination process S66, and a condition (third condition) determination process S67 for shifting from independent to parallel operation. The satellite signal search process S65 is the same as the process shown in FIG. When the satellite signal detection unit 851 cannot detect one or more satellites and the timeout time (15 seconds) for shifting to the RF / BB parallel operation mode has elapsed, the satellite signal detection unit 851 determines YES in step S66, and the date / time synchronization mode Exit.
If the satellite signal detection unit 851 determines NO in S66, a transition condition determination process S67 is performed. When it is determined YES in S67 corresponding to the third condition, specifically, when one or more satellite signals can be detected, the baseband control unit 85 sets the RF unit 70 to the operating state and sets the RF · The operation in the BB parallel operation mode (third control mode) is started (S68). The satellite signal tracking unit 852 executes a satellite signal tracking process S69.

After the satellite signal tracking process S69, the satellite signal tracking unit 852 determines whether or not a condition (first condition) for shifting from the parallel operation to the independent operation is satisfied (S70). The first condition for shifting from the parallel operation to the independent operation is a case where there is no satellite being tracked in the satellite signal tracking process S69, that is, a case where the satellite being tracked is 0, and is set in advance.
If the baseband control unit 85 determines YES in S70, the baseband control unit 85 performs the startup process S64 in the RF / BB independent operation mode, and thereafter repeats the processes of S65 to S70.
If the satellite signal detection unit 851 determines NO in S70, the satellite signal detection unit 851 executes the decoding / date / time synchronization / positioning process S71 of the satellite signal being tracked. This process S71 is the same as the process of S46 in the satellite navigation information collection mode shown in FIG. In this embodiment, as in the satellite navigation information collection mode, date and time synchronization and time zone correction (positioning operation) are also performed in S71. However, the time zone in which power consumption increases due to computation processing is required. It is good also as control which does not implement correction (positioning operation).
After the process of S71, the baseband control unit 85 determines whether or not the reception end condition (timeout 60 seconds) has been met (S72). If NO is determined in S72, the baseband control unit 85 returns to S69 and continues the process. On the other hand, if the baseband control unit 85 determines YES in S72, it ends the date and time synchronization mode.
After completion of the date / time synchronization mode, the process returns to FIG. 10, and the reception control unit 51 turns off the power of the GNSS reception circuit 45 (S8), and ends the reception process.

[Positioning mode]
In the positioning mode, positioning is performed using ephemeris information decoded from the signal received from the satellite system, the time and time zone of the receiver (electronic clock 1) are corrected, and the positioning position information is read by other applications. This mode is intended to be used.
This positioning mode will be described with reference to FIGS. Since the basic operation of the positioning mode is the same as that of the “satellite navigation information collection mode” and the “date / time synchronization (time measurement) mode” described above, the changes will be mainly described.

The reception control unit 51 first determines whether or not a hot start condition is met when starting positioning, that is, whether or not the GNSS reception circuit 45 can be activated by a hot start (S80). The hot start is a start state when current time information, initial position information (rough position, that is, a position within a certain range from the true position), and the number of ephemeris information that can be measured are known. In this case, the range of the satellite search can be limited, and the time for decoding the satellite navigation information is not required, so that faster positioning is possible as a result. In addition, since the satellite navigation information is known, positioning is possible even using a signal from a satellite with a weaker signal level. In other words, when the hot start condition is not satisfied (during cold start), it is necessary to receive satellite signals with a signal level that is high to some extent in order to acquire (decode) satellite navigation information. The positioning is possible even when using a satellite signal whose signal level is lower than that at the cold start.
Note that the “satellite navigation information collection mode” described above is a mode for obtaining ephemeris information of a number (three or more) that can be measured particularly because the hot start condition is mainly satisfied.

[Positioning mode (hot start)]
When the hot start condition is satisfied, the reception control unit 51 operates only in the RF / BB parallel operation mode (third control mode) and performs the positioning operation. If a satellite is found by the search process, a tracking process is performed. The flow of acquisition of satellite navigation information during tracking, date and time synchronization processing, and the like is the same as the reception processing S18 in the RF / BB parallel operation mode (second control mode) in the “satellite navigation information collection mode”.
Therefore, when the hot start condition is met (YES in S80), the reception control unit 51 executes a reception end condition setting process S81 and a satellite search parameter setting process S82 in the hot start condition.
The reception end condition set in S81 is that the time-out time of the entire process is 120 seconds, and the measurement is ended when the positioning is not completed even when the time-out time elapses and when the positioning is completed within the time-out time. .

In the satellite search parameters set in S82, the sensitivity range for performing the search also targets weak signals, and the search power is set smaller than usual. The weak signal is also considered here because the ephemeris is already held in the hot start, so it is not always necessary to acquire the ephemeris information from the satellite signal, and even a weak signal can be used for positioning.
In addition, setting the search power smaller than normal allows the search range to be significantly narrower than the case where the hot start condition is not met, as described above, so that a practical satellite search can be realized even with a search power smaller than normal. This is because power consumption can be further suppressed.

  Next, the reception control unit 51 performs an activation process S83 of the GNSS reception circuit 45 in the RF / BB parallel operation mode (second control mode). The satellite signal detection unit 851 performs satellite signal search processing S84, and the satellite signal tracking unit 852 performs satellite signal tracking processing S85. The baseband controller 85 executes a reception end condition determination process S86, a tracking process determination process S87, a decoding / date synchronization / positioning process S88, and a reception end condition determination process S89. Since these processes are substantially the same as the reception processes in the RF / BB parallel operation mode in the satellite navigation information collection mode described above, description thereof will be omitted.

[Positioning mode (cold start)]
When it is determined NO in S80, that is, when the hot start condition is not met, the reception control unit 51 executes reception processing S90 in the cold start positioning mode.
First, an outline of the flow of processing at a cold start will be described. At the cold start, as described above, the satellite signal search range is large and requires a search capability. Therefore, at the start of measurement, the operation is started in the RF / BB independent operation mode (first control mode). When the conditions such as finding the number of satellites necessary for positioning in the RF / BB independent operation mode (three or more satellites for positioning) are satisfied, the RF / BB parallel operation mode is set.
The processing in the RF / BB parallel operation mode is branched depending on whether or not power consumption is important. In the case of high-accuracy reception processing that places importance on positioning accuracy and positioning success rate, as well as “satellite navigation information collection mode”, not only tracking processing for satellites found in the RF / BB independent operation mode, but also satellites that are not tracking Also, the RF / BB parallel operation mode (second control mode) for executing the search / tracking process is executed. Thereby, positioning processing using a satellite signal with a high signal level is possible, and positioning accuracy and positioning success rate can be improved. On the other hand, in the RF / BB parallel operation mode, power consumption increases because search processing for satellites that have not been tracked is also performed.
On the other hand, in the case of low-power reception processing that places importance on power consumption, as in the “date / time synchronization (time measurement) mode”, RF / BB parallel that performs tracking processing only on satellites found in the RF / BB independent operation mode The operation mode (third control mode) is executed. As a result, the low power reception process can reduce power consumption compared to the high precision reception process. On the other hand, since the low power reception process does not search for a new satellite in the RF / BB parallel operation mode, there is a possibility that the positioning accuracy and the positioning success rate may be lower than the high precision reception process.

The specific reception process S90 at the time of the above cold start will be described with reference to FIG.
The reception control unit 51 executes a reception end condition setting process S91, a satellite search parameter setting process S92, and an RF / BB independent operation parameter setting process S93.
The reception end condition set in S91 is that the timeout time until transition to the RF / BB parallel operation is 15 seconds, the timeout time of the entire process (positioning process) is 120 seconds, and the positioning is not completed even after the timeout time elapses. If the positioning is completed within the timeout time, the measurement is terminated.
In the satellite search parameter set in S92, the sensitivity range for performing the search is set to a strong signal sensitivity range to some extent so that satellite navigation information can be acquired from the satellite signal. The search power is set to a normal level and higher than that in the hot start condition.
The parameters of the RF / BB independent operation mode set in S93 are the transition conditions from the independent operation mode to the parallel operation mode. Basically, the number of satellites found in the search is the minimum number of satellites required for positioning. This is a condition.

Next, the reception control unit 51 performs an activation process S94 of the GNSS reception circuit 45 in the RF / BB independent operation mode (first control mode). Therefore, one of the first conditions for executing the first control mode is that reception is started in the positioning mode (cold start). The satellite signal detection unit 851 executes a satellite signal search process S95, a reception end condition determination process S96, and a transition condition determination process S97 from independent to parallel operation. Since these processes are the same as the processes in the satellite navigation information collection mode, description thereof is omitted.
If YES in S97, that is, if three or more satellites are found in the satellite signal search process S95 in the independent operation mode, the reception control unit 51 is set to place importance on power consumption as a positioning process at a cold start. It is determined whether or not (S98). If the reception control unit 51 determines NO in S98, the reception control unit 51 executes the high-accuracy reception process S100, and if it determines YES in S98, the reception control unit 51 executes the low power reception process S110.
Here, the determination in S98 may be made based on, for example, the remaining battery level of the receiver (electronic timepiece 1), or may be made based on the use (application) of the position information obtained by the positioning process. For example, when the positioning process is performed to determine the time zone of the electronic timepiece 1, there is no practical problem even if the positioning error is large to some extent, so the low power reception process may be executed. On the other hand, when acquiring movement information such as a person or a vehicle wearing a receiver like a GPS logger, it is necessary to perform high-accuracy reception processing because it is necessary to increase the positional accuracy.

[High-precision reception processing]
When the high-accuracy reception process S100 is executed, as shown in FIG. 19, the baseband control unit 85 operates the GNSS reception circuit 45 in the RF / BB parallel operation mode (S101).
Then, the satellite signal detection unit 851 and the satellite signal tracking unit 852 are a satellite signal search process S102 for searching for a satellite that is not currently being tracked, a satellite signal tracking process S103, a reception end condition determination process S104, and a tracking satellite presence determination process. S105, decoding / date synchronization / positioning processing S106, and reception end condition determination processing S107 are executed. These processes S101 to S107 are the same as the processes in the RF / BB parallel operation mode (second control mode) in the satellite navigation information collection mode.
Note that the reception end conditions of the reception end condition determination processing S104 and S107 are when positioning reception is successful and when timeout time (120 seconds) elapses from the start of positioning mode without successful positioning reception. The determination condition in step S105 is YES if the tracking satellite is three or more satellites necessary for positioning, and NO if it is less than three satellites.
If YES in step S104 or S107, the reception control unit 51 ends the high-precision reception process, returns to FIG. 18, and ends the positioning mode. Further, the reception control unit 51 returns to FIG. 10, turns off the power of the GNSS reception circuit 45 (S8), and ends the reception process.

[Low power reception processing]
When the low power reception process S110 is executed, as shown in FIG. 20, the baseband control unit 85 operates the GNSS reception circuit 45 in the RF / BB parallel operation mode (S111).
The satellite signal detection unit 851 and the satellite signal tracking unit 852 perform a satellite signal tracking process S112, a transition condition determination process S113 from parallel to independent operation, a decoding / date synchronization / positioning process S114, and a reception end condition determination process S115. Execute. These processes S111 to S115 are the same as the processes in the date / time synchronization mode.
However, since it is the positioning mode, the determination process S113 for determining the transition condition (first condition) from parallel to independent operation determines YES if the number of tracking satellites is less than the three satellites necessary for positioning, If 3 satellites or more are maintained, NO is determined. If the determination in step S113 is YES, the satellite signal detection unit 851 returns to the process S94 in FIG. 18, switches to the operation in the RF / BB independent operation mode, and executes the processes after the satellite signal search process S95.
The determination conditions of the reception end condition determination process S115 are when positioning reception is successful and when timeout time (120 seconds) elapses from the start of positioning mode without successful positioning reception.
If YES in step S115, the reception control unit 51 ends the low power reception process, returns to FIG. 18, and ends the positioning mode. Further, the reception control unit 51 returns to FIG. 10, turns off the power of the GNSS reception circuit 45 (S8), and ends the reception process.

The positioning mode first determines whether the hot start condition is satisfied or not. Based on the determination result, the startup process S83 in the normal RF / BB parallel operation mode or the RF / BB independent operation mode is performed. If the activation process S94 is selected and the hot start condition is satisfied, the positioning operation can be performed while suppressing power consumption by reducing the search power instead of not operating in the RF / BB independent operation mode.
Also, when it is cold start and positioning accuracy and positioning success rate are important, search for the minimum necessary satellite while suppressing power consumption by starting in RF / BB independent operation mode. By searching for satellites that have not yet been found after shifting to the parallel operation mode, it is possible to search for more satellites and perform positioning calculations using more satellites. A positioning rate can be realized.
In addition, when cold starting and when reducing power consumption is important, tracking, decoding, and positioning in the RF / BB parallel operation mode for the minimum number of satellites found in the RF / BB independent operation mode Since the process is performed, the positioning operation can be realized while suppressing the power consumption more than the two conditions of the hot start and the high accuracy reception process at the cold start.

[Effects of Embodiment]
According to the electronic timepiece 1, the baseband control unit 85, which is a control unit, controls the RF unit 70 and the correlation calculation processing unit 84 as a first control mode (RF / BB independent operation mode) and a second control mode ( RF / BB parallel operation mode), it is possible to increase the number of satellites from which satellite signals can be acquired while suppressing power consumption.
That is, if the first control mode is executed at the start of reception processing, the RF unit 70 and the correlation calculation processing unit 84 do not operate simultaneously, so that peak current can be suppressed and power consumption can be reduced. Therefore, it is possible to determine whether or not the environment can detect the satellite with low power consumption by first executing the first control mode and performing the first detection process. For this reason, even when the reception process is started in a state where the electronic timepiece 1 is disposed indoors, it is possible to determine that the environment is not suitable for reception with low power consumption, and to terminate the reception process.
Further, when the second control mode is executed, the baseband control unit 85 uses the RF unit 70 and the correlation calculation processing unit 84 as operating states, and performs a second detection process (search process) for detecting a satellite signal, A tracking process for tracking the satellite signal is executed. At this time, in the second control mode, since a detection process for detecting a new satellite signal is performed, even a satellite signal that could not be detected when the first control mode was executed is detected when the second control mode is executed. You may be able to. Therefore, in the tracking process in the second control mode, in addition to the satellite signal detected in the first detection process in the first control mode, the satellite signal detected in the second detection process in the second control mode can also be tracked. More satellite signals can be tracked. For this reason, since satellite signals with high signal strength can be received or many satellite signals can be received, the positioning success rate for successfully acquiring position information can be improved, and the accuracy of position information can also be improved.

In the present embodiment, a third control mode is provided in addition to the first control mode and the second control mode. In the third control mode, only the satellite signal detected in the first control mode is tracked, so that power consumption can be reduced compared to the second control mode. Therefore, the baseband control unit 85 can suppress power consumption and increase the number of satellites from which satellite signals can be acquired by selecting and executing the first control mode, the second control mode, and the third control mode. In particular, since the second control mode and the third control mode can be selected and executed according to the type of information to be acquired, etc., high-accuracy reception processing with improved position accuracy and positioning success rate by the second control mode, It is possible to select a low-power reception process that can reduce power consumption in the three control modes, and necessary information can be acquired with minimum power consumption.
Therefore, the baseband control unit 85 selects each control mode depending on the purpose of reception, that is, the type of information to be acquired, position accuracy, or low power consumption. Optimal performance can be achieved with optimal power consumption.
In addition, because the search target sensitivity range and the search power are set according to the reception mode such as the satellite navigation information collection mode, the date / time synchronization mode, and the positioning mode, the reception purpose can be realized while further reducing the power consumption.
Furthermore, as the reception end condition, the timeout time for the entire process and the timeout time for transition from the independent operation mode to the parallel operation mode are set according to the reception mode, so the reception processing is continued according to the reception purpose. It is possible to appropriately determine whether or not it should be performed, and it is possible to prevent useless reception processing from continuing, and to reduce power consumption accordingly.

  In the satellite navigation information collection mode, after starting in the first control mode, after a satellite with a second predetermined value or more (in the above embodiment, the number of satellites is 1 or more) is found, the system shifts to the second control mode and is currently found. While tracking satellites and decoding satellite navigation information, it is possible to search for new satellites that are not currently found and track them, so a large amount of satellite navigation information can be acquired. In addition, since it is confirmed whether the environment is such that the satellite can be detected in the first control mode at the start of reception, power consumption when the satellite cannot be detected is reduced compared to when the reception process is started in the second control mode. it can. Therefore, satellite navigation information can be acquired while suppressing power consumption.

  In the date / time synchronization mode, after starting in the first control mode, if a satellite with a third predetermined value or more (in the above embodiment, the number of satellites is one or more) is found, switch to the third control mode and execute reception processing. Yes. For this reason, it is possible to determine whether the environment is such that the satellite signal can be received with the minimum power consumption by the first control mode. In addition, since the new satellite detection process is not performed when the time information is acquired in the third control mode, the time information can be acquired with minimum power consumption.

In the time measurement reception mode, when hot start, cold start, and when importance is placed on improving the accuracy of position information (high-accuracy reception processing), and when cold start and importance is placed on reducing power consumption (low) Since different reception control is performed in the power reception process), position information can be acquired with optimal power consumption according to each measurement purpose.
That is, at the time of hot start, the reception process is executed in the second control mode without executing the first control mode. At the time of hot start, since the search range (frequency range for searching) of the satellite signal can be limited and the search power can be reduced, the power consumption can be reduced even if the second control mode is executed. Furthermore, since the search and tracking can be performed in real time by executing the second control mode from the start of reception, the positioning time can be shortened and the positioning rate can be improved.
In addition, when the cold start is intended for high-precision reception processing, reception processing is started in the first control mode, and the number of satellite signals detected in the first control mode is equal to the number of satellites necessary for positioning ( For example, if there are three or more satellites), the reception process is continued by switching to the second control mode. For this reason, since satellites that could not be detected in the first control mode can also be detected in the second control mode, the satellites that can be detected in the first control mode and the second control mode can be tracked, and more satellite signals can be detected. Can be obtained. For this reason, since the probability that position information can be acquired using a satellite signal with a high signal level is also increased, the positioning success rate can be improved, and highly accurate position information can be acquired.
Furthermore, when the cold start is intended for low power reception processing, the reception processing is started in the first control mode, and the number of satellite signals detected in the first control mode is equal to the number of satellites necessary for positioning ( For example, if there are three or more satellites), the reception process is continued by switching to the third control mode. In the third control mode, since only the satellites detected in the first control mode are tracked, power consumption can be reduced compared to the case where the second control mode is executed.

In addition, in the date and time synchronization mode for executing the third control mode and the low power reception processing in the positioning mode, the number of tracking satellites is less than a predetermined number during execution of the third control mode (the date and time synchronization mode is less than one satellite). If the positioning mode is less than 3 satellites), since the acquisition of information cannot be succeeded even if the tracking process is continued, the operation is switched to the first control mode. Therefore, it is possible to determine again whether or not the environment is such that information acquisition can be successfully performed while suppressing power consumption, and since it is possible to newly search for a satellite that can be detected at that time, the second control mode can be executed again.
According to this, after the execution of the third control mode, it is possible to improve the acquisition success rate of time information and position information, compared to the case where the first control mode is not executed.

The condition for shifting from the first control mode to the second control mode or the third control mode is set to one or more satellites, which is the minimum value from which time information can be acquired, in the date / time synchronization mode, and in the positioning mode. , It is set to 3 satellites or more which is the minimum value from which position information can be acquired.
According to this, the parallel operation mode can be set and the tracking process can be executed only when the number of satellite signals necessary for information acquisition can be detected. Thereby, it can suppress that a tracking process is performed in the condition where acquisition of information cannot succeed.

[Other Embodiments]
The present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

In the embodiment, the three control modes of the first control mode, the second control mode, and the third control mode can be executed. However, the first control mode can be obtained by replacing the third control mode with the second control mode. Only two types of control modes, i.e., the second control mode, may be executable.
However, when the three control modes can be executed as in the above-described embodiment, the control mode can be selected according to each reception purpose, so that there is an advantage that the optimum performance can be realized with the optimum power consumption.

In the embodiment, in the navigation information collection mode and the date / time synchronization mode, the second predetermined value or the third predetermined value, which is a condition for shifting to the second control mode or the third control mode, is set to one satellite. It may be set. In the positioning mode, the second predetermined value and the third predetermined value are set to three satellites, but may be set to four or more satellites.
Furthermore, in the above-described embodiment, the condition for shifting from the first control mode to the third control mode and the condition for shifting from the third control mode to the second control mode are the same number of satellites, but they may be different numbers.
Further, the conditions for shifting each control mode may be changed according to the elapsed time from the start of the reception process.

  The electronic device of the present invention is not limited to a wristwatch (electronic timepiece), and is widely used in devices that receive satellite signals transmitted from a position information satellite, such as a mobile phone and a portable GPS receiver used for mountain climbing. Available.

  In each of the above embodiments, the GPS satellite 100 has been described as an example of the position information satellite, but the present invention is not limited to this. For example, as the position information satellite, a satellite used in other global public navigation satellite systems (GNSS) such as Galileo (EU), GLONASS (Russia), and Beidou (China) can be applied. Further, a geostationary satellite such as a geostationary satellite type satellite navigation augmentation system (SBAS) or a satellite such as a regional satellite positioning system (RNSS) that can search only in a specific region such as a quasi-zenith satellite can be applied.

  DESCRIPTION OF SYMBOLS 1 ... Electronic timepiece (electronic device), 110 ... Antenna body, 45 ... GNSS receiving circuit (satellite signal receiving apparatus), 50 ... Control circuit, 51 ... Reception control part, 70 ... RF part (receiving part), 80 ... Baseband , 81 ... Sampling unit, 82 ... Sample memory unit (received signal storage unit), 83 ... Replica code generation unit, 84 ... Correlation calculation processing unit, 85 ... Baseband control unit (control unit), 851 ... Satellite signal detection unit 852 ... Satellite signal tracking unit, 853 ... Satellite navigation information decoding unit, 854 ... Time / position information calculation unit.

Claims (10)

A receiver that receives radio waves in the frequency band of the satellite signal transmitted by the position information satellite and outputs a received signal;
A received signal storage unit for storing the received signal;
A correlation calculation processing unit for calculating a correlation value of a code corresponding to the received signal and the position information satellite;
A control unit that controls operations of the reception unit and the correlation calculation processing unit,
The controller is
The reception unit is in an operating state, the correlation calculation processing unit is in an inoperative state, the reception signal output from the reception unit is stored in the reception signal storage unit, and the reception signal for a predetermined period is stored in the reception signal storage unit. When stored in the reception signal storage unit, the correlation value of the reception signal and the code stored in the reception signal storage unit is calculated with the reception unit in an inoperative state and the correlation calculation processing unit in an operation state. A first control mode for executing a first detection process for detecting the satellite signal;
A second detection process for detecting the satellite signal by calculating a correlation value of the reception signal and the code output from the reception unit with the reception unit and the correlation calculation processing unit as operating states; A first control process and a tracking process for tracking the satellite signal detected in the second detection process, and a second control mode for acquiring information based on the tracked satellite signal. Yes,
The satellite signal receiving device, wherein the first control mode is executed when a preset first condition is met, and the second control mode is executed when a preset second condition is met. The satellite signal receiving device according to claim 1,
The controller is
Tracking the satellite signal detected in the first detection process by calculating a correlation value of the reception signal and the code output from the reception unit with the reception unit and the correlation calculation processing unit as operating states And a third control mode for acquiring information based on the tracked satellite signal.
The satellite signal receiving apparatus, wherein the third control mode is executed when a preset third condition is satisfied. The satellite signal receiving device according to claim 2,
The information is time information,
The control unit is operable in a date and time synchronization mode for acquiring the time information,
When operating in the date / time synchronization mode, the reception process is started in the first control mode, and the third condition is met when the number of the satellite signals detected in the first control mode is equal to or greater than a predetermined number. A satellite signal receiving apparatus characterized in that it determines that it has been performed, and switches to the third control mode to execute reception processing. In the satellite signal receiving device according to any one of claims 1 to 3,
The information is satellite navigation information,
The control unit is operable in a satellite navigation information collecting mode for acquiring the satellite navigation information;
When operating in the satellite navigation information collection mode, the reception process is started in the first control mode, and the second condition is satisfied when the number of the satellite signals detected in the first control mode is equal to or greater than a predetermined number. The satellite signal receiving apparatus, wherein the receiving process is executed by switching to the second control mode. In the satellite signal receiving device according to any one of claims 1 to 4,
The information is position information,
The control unit is operable in a positioning mode for acquiring the position information;
When operated in the positioning mode, the reception process is executed in the second control mode as long as the satellite signal can be activated by hot start. In the satellite signal receiving device according to any one of claims 1 to 5,
The information is position information,
The control unit is operable in a positioning mode for acquiring the position information;
When it is operated in the positioning mode, cannot be started by hot start, and when performing high-accuracy reception processing, the reception processing is started in the first control mode and detected in the first control mode. When the number of satellite signals is equal to or greater than the number of satellites necessary for positioning, it is determined that the second condition is satisfied, and the reception process is executed by switching to the second control mode. The satellite signal receiving device according to claim 2,
The information is position information,
The control unit is operable in a positioning mode for acquiring the position information;
When it is operated in the positioning mode, cannot be started by hot start, and when low power reception processing is performed, the reception processing is started in the first control mode and detected in the first control mode. A satellite signal receiving apparatus, wherein when the number of satellite signals is equal to or greater than the number of satellites necessary for positioning, it is determined that the third condition is satisfied, and the reception process is executed by switching to the third control mode. In the satellite signal receiving device according to any one of claims 1 to 7,
The controller is
The sensitivity range for performing the first detection process, the sensitivity range for performing the second detection process, the ability to perform the first detection process, and the ability to perform the second detection process can be set. A satellite signal receiving device characterized by comprising: An electronic apparatus comprising the satellite signal receiving device according to any one of claims 1 to 8. A receiving unit that receives radio waves in the frequency band of the satellite signal transmitted by the position information satellite and outputs a received signal; a received signal storage unit that stores the received signal; and a code corresponding to the received signal and the position information satellite A correlation signal processing unit for calculating a correlation value of the satellite signal receiving apparatus,
The reception unit is in an operating state, the correlation calculation processing unit is in an inoperative state, the reception signal output from the reception unit is stored in the reception signal storage unit, and the reception signal for a predetermined period is stored in the reception signal storage unit. When stored in the reception signal storage unit, the correlation value of the reception signal and the code stored in the reception signal storage unit is calculated with the reception unit in an inoperative state and the correlation calculation processing unit in an operation state. A first control step for executing a first detection process for detecting the satellite signal;
A second detection process for detecting the satellite signal by calculating a correlation value of the reception signal and the code output from the reception unit with the reception unit and the correlation calculation processing unit as operating states; And a second control step for performing tracking processing for tracking the satellite signal detected in the first detection processing and the second detection processing, and acquiring information based on the tracked satellite signal,
A control method for a satellite signal receiving device, wherein the first control step is executed when a first condition set in advance is satisfied, and the second control step is executed when a second condition set in advance is satisfied.

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