JP2012251947A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus capable of more effectively shortening time required to calculate position information.SOLUTION: A satellite travel information generating section 122 generates satellite travel information on the basis of a radio wave signal received from a navigation satellite and stores the satellite travel information in a storing section 130. A communicating section 70 has a function for receiving the radio wave signal from the navigation satellite to perform direct radio communication with another electronic apparatus located at a distance where the direct radio communication is possible. A satellite travel information receiving section 22 receives satellite travel information from the another electronic apparatus through the communicating section 70. A satellite travel information updating section 24 collates the satellite travel information received by the satellite travel information receiving section 22 with the satellite travel information stored in the storing section 130, and updates the satellite travel information stored in the storing section 130 by using the satellite travel information received by the satellite travel information receiving section 22. A position information calculating section 124 calculates its own position information on the basis of the satellite travel information stored in the storing section 130.

Description

  The present invention relates to an electronic device having a function of receiving a radio signal from a navigation satellite.

  A satellite navigation system ("satellite positioning system") that transmits radio waves superimposed with time and orbit information from multiple navigation satellites (a type of artificial satellite) and receives these radio waves with a ground receiver to measure the position. Also known as). As a widely used satellite navigation system (satellite positioning system), there is a GPS (Global Positioning System) which is a kind of Global Navigation Satellite Systems (GNSS).

  In this system, a GPS receiver receives a radio signal transmitted from a GPS satellite (hereinafter referred to as a “GPS satellite signal”), and GPS satellite information superimposed on the GPS satellite signal (orbit information of GPS satellite, time information, etc.) ) To obtain position information. In such a GPS receiver, provision of position information in a short time is often requested, and GPS satellite information at the time of position information calculation is stored and used for the next position information calculation. However, when the GPS receiver is started up or returned from the standby state, the GPS satellite information may not be stored or may not be used because the stored GPS satellite information is old. In such a case, it must be performed from the process of searching for a GPS satellite that can be captured, and even if the reception conditions are good, it takes about several minutes to calculate the position information.

  In order to solve this problem, a method has been proposed in which a GPS receiver acquires the latest GPS satellite information by communicating with a GPS satellite information server that manages and records the latest GPS satellite information (server assist).

JP 2002-195846 A

  However, the information acquired from the GPS satellite information server is only general information such as satellite information that can be received in the area. Even if the acquired information is used, there is actually an obstacle such as a building. In some cases, GPS satellite signals cannot be received. Further, communication with the GPS satellite information server needs to be performed via a mobile phone communication network or a LAN, which increases costs and current consumption, and is not suitable for a small electronic device equipped with a GPS receiver.

  The present invention has been made in view of the above problems, and according to some aspects of the present invention, it is possible to provide an electronic device capable of more effectively reducing the time required for calculating position information. can do.

  (1) The present invention is an electronic device having a function of receiving a radio signal from a navigation satellite, generates satellite operation information based on the radio signal received from the navigation satellite, and stores the generated satellite operation information in a storage unit A satellite operation information generating unit stored in the communication unit, a communication unit having a function of receiving radio signals from the navigation satellite, and performing direct wireless communication with other electronic devices at a distance capable of direct wireless communication; A satellite operation information receiving unit that receives satellite operation information from the other electronic device via the communication unit; satellite operation information received by the satellite operation information receiving unit; and satellite operation information stored in the storage unit. The satellite operation information update unit updates the satellite operation information stored in the storage unit using the satellite operation information received by the satellite operation information reception unit according to the comparison result, and is stored in the storage unit. To satellite operation information Zui and includes a position information calculating unit that calculates position information of the self, and an electronic apparatus.

  According to the electronic device of the present invention, for example, when satellite operation information effective for calculating position information is received from another electronic device, the stored satellite operation information is received from the other electronic device as necessary. By using the updated satellite operation information, it is possible to obtain effective satellite operation information by calculating the position information. Therefore, according to the present invention, the time required for the position information calculation process can be more effectively reduced.

  (2) In this electronic device, the satellite operation information receiving unit may receive captured satellite information that can identify a navigation satellite captured by the other electronic device as satellite operation information.

  In this way, by using captured satellite information received from other electronic devices, it is possible to try to acquire satellite information necessary for calculating position information in preference to navigation satellites that have a relatively high possibility of being captured. . Therefore, the time required for the position information calculation process can be shortened as compared with the case where the position information is calculated from a state in which no captureable navigation satellite is known at the time of activation.

  (3) In this electronic device, the satellite operation information receiving unit may receive orbit information capable of specifying the orbit of the navigation satellite as the satellite operation information.

  In this way, orbit information received from other electronic devices (such as approximate orbit information that can specify the approximate orbit of the navigation satellite, detailed orbit information that can specify the detailed orbit of the navigation satellite captured by the other electronic device, etc. ) Can be used to increase the efficiency of the satellite information acquisition process necessary for calculating the position information, and the time required for the position information calculation process can be efficiently reduced.

  (4) In this electronic device, the satellite operation information receiving unit may receive management information that supports calculation of the position information as satellite operation information.

  As described above, by using the management information received from another electronic device, the position information calculation process can be made more efficient, so that the processing time can be efficiently shortened.

  (5) In this electronic device, after receiving the captured satellite information, the satellite operation information receiving unit may further receive orbit information capable of specifying the orbit of the navigation satellite as satellite operation information.

  In this way, even if communication with another electronic device is disabled after receiving captured satellite information and before or during the reception of orbit information, the position information is based on the received captured satellite information. It is possible to reduce the time required to calculate

  (6) In this electronic device, after receiving the captured satellite information, the satellite operation information receiving unit may further receive management information that supports calculation of the position information as satellite operation information.

  In this way, even if communication with other electronic devices is disabled after receiving orbit information and before or during reception of management information, it is based on received captured satellite information and orbit information. The time required for calculating the position information can be efficiently reduced.

  (7) In this electronic device, the satellite operation information update unit includes a time stamp attached to the satellite operation information received by the satellite operation information reception unit and a time attached to the satellite operation information stored in the storage unit. When the satellite operation information received by the satellite operation information receiving unit is newer than the satellite operation information stored in the storage unit, the satellite operation information stored in the storage unit is received. You may make it update to the satellite operation information which the part received.

  In this way, since the satellite operation information stored in the storage unit can be kept in a newer state, the time required for the position information calculation process can be shortened.

  (8) In response to a request for transmitting satellite operation information from another electronic device, the electronic device transmits at least part of the satellite operation information stored in the storage unit via the communication unit. You may make it further contain the satellite operation information transmission part transmitted to an apparatus.

  If it does in this way, the satellite operation information optimal for calculation of position information can be shared between the said electronic device and another electronic device.

  (9) In this electronic device, the satellite operation information transmitting unit determines whether the satellite operation information stored in the storage unit is information within an expiration date, and determines the satellite operation information that has passed the expiration date. You may make it not transmit.

  In this way, by not transmitting wasteful satellite operation information that cannot be used for calculating position information, it is possible to reduce time and current consumption required for communication with other electronic devices.

The figure for demonstrating the outline | summary of GPS. The figure for demonstrating the structure of the navigation message of GPS. FIG. 10 is a diagram illustrating a configuration example of an electronic apparatus according to an embodiment. Explanatory drawing about the example of mounting of a GPS antenna and a GPS module. Explanatory drawing about the example of mounting of a GPS antenna and a GPS module. Explanatory drawing about the example of mounting of a GPS antenna and a GPS module. The flowchart figure which shows an example of the whole process of position information calculation. The flowchart figure which shows the specific example of near field communication (reception of satellite operation information). The flowchart figure which shows the specific example of near field communication (transmission of satellite operation information). The flowchart figure which shows the specific example of a satellite operation information update process. The flowchart figure which shows the specific example of a positional information calculation process.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. Also, not all of the configurations described below are essential constituent requirements of the present invention.

1. Outline of GPS FIG. 1 is a diagram for explaining an outline of GPS.

  The GPS satellite 2 (an example of a navigation satellite) orbits a predetermined orbit above the earth, and a radio signal (hereinafter referred to as “GPS satellite signal”) in which a navigation message is superimposed on a 1.57542 GHz radio wave (L1 wave). ”) To the ground.

  Currently, there are about 30 GPS satellites, and in order to identify which GPS satellite the GPS satellite signal is transmitted from, each GPS satellite is 1023 chip (1 ms) called C / A code (Coarse / Acquisition Code). (Period) unique pattern is superimposed on the GPS satellite signal. The C / A code looks like a random pattern with each chip being either +1 or -1. GPS employs a CDMA (Code Division Multiple Access) system in which all GPS satellites transmit satellite signals of the same frequency using different C / A codes, and the GPS satellite signals and the patterns of each C / A code are used. By taking the correlation, the C / A code superimposed on the GPS satellite signal can be detected.

  The GPS satellite 2 includes an atomic clock, and the GPS satellite signal includes extremely accurate time information measured by the atomic clock. In addition, a slight time error of the atomic clock mounted on each GPS satellite is measured by a control segment (not shown) on the ground, and the navigation message includes time correction data for correcting the time error. ing.

  FIG. 2 is a diagram for explaining the configuration of the navigation message. As shown in FIG. 2, 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. One subframe of data is transmitted in 6 seconds from each GPS satellite. Accordingly, data of one main frame is transmitted from each GPS satellite in 30 seconds.

  Subframe 1 includes satellite correction data such as week number data and the time correction data. The week number data is information representing a week including the current GPS time information. The starting point of the GPS time information is January 6, 1980, 00:00:00 in UTC (Coordinated Universal Time), and the week starting on this day is the week number 0. Week number data is updated on a weekly basis.

  Subframes 2 and 3 include ephemeris data (detailed orbit information of each GPS satellite). The ephemeris data is detailed orbit information of each GPS satellite and is updated every 2 hours, and the valid time is about 4 hours.

  Subframes 4 and 5 contain almanac data. Almanac data is rough orbit information of all GPS satellites, and is updated every day.

  Further, subframes 1 to 5 include, from the beginning, a TLM (Telemetry) word storing a 30-bit synchronization pattern and a HOW word storing 30-bit time information.

  TLM words and HOW words are transmitted from GPS satellites at intervals of 6 seconds, whereas satellite correction data such as week number data, ephemeris data, and almanac data are transmitted at intervals of 30 seconds.

  The electronic device 1 of the present embodiment receives GPS satellite signals from each GPS satellite, demodulates the navigation message, corrects the internal time using time information and time correction data included in the navigation message, Positioning calculation processing is performed using time information and orbit information (ephemeris data) included in the message.

  When the electronic device 1 calculates a two-dimensional position (x, y), the time information included in each navigation message from three or more GPS satellites, in addition to x, y, the internal time error t is an unknown. And orbit information (ephemeris data) are used to establish three or more simultaneous equations, and a process for obtaining the solution is performed. Similarly, when calculating the three-dimensional position (x, y, z), the electronic device 1 sets the error t of the internal time in addition to x, y, z as an unknown number, and sets each of four or more GPS satellites. Using the time information and trajectory information (ephemeris data) included in the navigation message, four or more simultaneous equations are established, and a process for obtaining the solution is performed.

  When the electronic device 1 does not hold valid ephemeris data such as when the power is turned on, the electronic device 1 starts with a process of searching for a GPS satellite that can be captured, that is, capable of demodulating a navigation message (cold start). In the case of a cold start, it takes 12.5 minutes to try to acquire ephemeris data for all GPS satellites and store the acquired ephemeris data. Although three-dimensional positioning calculation can be performed when ephemeris data of four or more GPS satellites is obtained, it takes about several minutes until the result is obtained.

  On the other hand, when the electronic device 1 does not hold valid ephemeris data, such as when returning from standby mode, it can estimate GPS satellites that can be captured if it holds valid almanac data. As a result, it is possible to shorten the time until the positioning calculation result is obtained (warm start).

  Moreover, if the electronic device 1 holds four or more valid ephemeris data, the electronic device 1 can immediately start positioning calculation (hot start).

  Before starting the positioning calculation, the electronic device 1 according to the present embodiment directly communicates with another electronic device 1 that is within a distance where direct wireless communication (wireless communication not via a server) is possible (hereinafter, “ Short distance wireless communication ”), and satellite operation information related to the operation of the GPS satellite is received from the other electronic device 1. This satellite operation information includes, in addition to each information included in the navigation message, information on the captured GPS satellite, reception intensity of the GPS satellite signal, and the like. Then, the electronic device 1 compares and selects each information included in the satellite operation information stored in the electronic device 1 and each information included in the satellite operation information received from the other electronic device 1, and selects and updates the information. Update to satellite operation information and perform positioning calculation using the updated satellite operation information. Thereby, it is possible to shorten the time for positioning calculation.

2. 2. Configuration of electronic device 2-1. Functional Configuration FIG. 3 is a diagram illustrating a configuration example of an electronic device according to the present embodiment. The electronic device 1 of this embodiment includes a GPS module 10, a GPS antenna 12, a TCXO (Temperature Compensated X'tal Oscillator) 14, a processing unit (CPU) 20, an operation unit 30, a display unit 40, and a ROM (Read Only Memory) 50. A RAM (Random Access Memory) 60 and a communication unit 70 are included. Note that the electronic device 1 of the present embodiment may have a configuration in which some of these configurations (elements) are omitted or a new configuration (element) is added.

  The GPS module (GPS receiver) 10 includes a SAW (Surface Acoustic Wave) filter 100, an RF processing unit 110, a baseband processing unit 120, and a storage unit 130. Note that the GPS module 10 of the present embodiment may have a configuration in which some of these configurations (elements) are omitted or a new configuration (element) is added.

  The SAW filter 100 performs a process of extracting a GPS satellite signal from the radio wave received by the GPS antenna 12. That is, the SAW filter 100 is configured as a band-pass filter that passes a 1.5 GHz band signal.

  The RF processing unit 110 down-converts the GPS satellite signal extracted by the SAW filter 100 into a signal (IF signal) in an intermediate frequency band (for example, several MHz), and then performs A / D conversion to the baseband processing unit 120. Output.

  The baseband processing unit 120 demodulates the baseband signal from the IF signal output from the RF processing unit 110 and performs various processes on the demodulated baseband signal. In particular, the baseband processing unit 120 of the present embodiment includes a satellite operation information generation unit 122 and a position information calculation unit 124. Note that the baseband processing unit 120 of this embodiment may have a configuration in which some of these configurations (elements) are omitted or a new configuration (element) is added.

  The satellite operation information generation unit 122 generates satellite operation information related to the operation of the GPS satellite based on the baseband signal, and performs processing for storing the generated satellite operation information in the storage unit 130.

  Specifically, the satellite operation information generation unit 122 first performs a satellite search process for searching for a GPS satellite that can be captured. More specifically, the satellite operation information generation unit 122 generates a local code having the same pattern as each C / A code, and performs a process of correlating each C / A code included in the baseband signal with the local code. . Then, the satellite operation information generation unit 122 adjusts the local code generation timing so that the correlation value for each local code becomes a peak, and if the correlation value is equal to or greater than the threshold value, it synchronizes with the GPS satellite of the local code ( It is determined that the GPS satellite has been captured). Then, the satellite operation information generation unit 122 stores the satellite identification information (for example, satellite number) of the captured GPS satellite in the storage unit 130. The satellite operation information generation unit 122 can shorten the processing time by performing the satellite search processing in parallel for a plurality of (for example, 12) satellites.

  In addition, the satellite operation information generation unit 122 demodulates the navigation message from the baseband signal and acquires various types of information included in the navigation message. Specifically, the satellite operation information generation unit 122 demodulates the navigation message by mixing the local code and the baseband signal having the same pattern as the C / A code of the captured GPS satellite, and is included in the navigation message. Get orbit information (ephemeris data and almanac data) and time information. Then, the satellite operation information generation unit 122 stores each information included in the acquired navigation message in the storage unit 130.

  Furthermore, the satellite operation information generation unit 122 may store information on the reception intensity of the GPS satellite signal from each GPS satellite in the storage unit 130.

  In addition, the satellite operation information generation unit 122 adds a time stamp such as the date and time acquired or generated to each of the satellite operation information and stores the information in the storage unit 130.

  The satellite operation information and other satellite operation information generated by the satellite operation information generation unit 122 are stored in the storage unit 130 as a satellite operation information list 132.

  The position information calculation unit 124 performs positioning calculation based on the latest satellite operation information list 132 stored in the storage unit 130 and stores the positioning data (position information and time information) obtained by the positioning calculation in the storage unit 130. Store or transmit the positioning data to the processing unit (CPU) 20.

  The TCXO 14 generates a clock signal for the RF processing unit 110 and the baseband processing unit 120.

  The ROM 50 stores programs for the processing unit (CPU) 20 to perform various calculation processes and control processes, programs and data for various applications, and the like.

  The processing unit (CPU) 20 performs various types of calculation processing and control processing according to a program stored in the ROM 50. Specifically, the processing unit (CPU) 20 transmits various control commands to the GPS module 10 to control the operation of the GPS module 10 or receives positioning data from the GPS module 10 to perform various calculation processes. I do. In addition, the processing unit (CPU) 20 performs various processes in accordance with operation signals from the operation unit 30, processes for transmitting display signals for displaying various types of information on the display unit 40, and other electronic devices 1 and data. In order to perform communication, processing for controlling the communication unit 350 is performed.

  The operation unit 30 is an input device including operation keys, button switches, a touch panel, and the like, and outputs an operation signal corresponding to an operation by a user to the processing unit (CPU) 20. By operating the operation unit 30, activation and termination of various applications are instructed.

  The display unit 40 is a display device configured by an LCD (Liquid Crystal Display) or the like, and displays various types of information (for example, position information and time information) based on a display signal input from the processing unit (CPU) 20. indicate.

  The RAM 60 is used as a work area of the processing unit (CPU) 20, and programs and data read from the ROM 50, data input from the operation unit 30, calculation results executed by the processing unit (CPU) 20 according to various programs, and the like. Is temporarily stored.

  The communication unit 70 performs short-range wireless communication with other electronic devices 1. Specifically, the communication unit 70 receives data from the processing unit (CPU) 20 superimposed on a radio signal and transmitted to the other electronic device 1 or a radio signal from the other electronic device 1. A process of extracting data superimposed on the wireless signal and outputting it to the processing unit (CPU) 20 is performed. Examples of communication standards for short-range wireless communication include Bluetooth (registered trademark), BLE (Bluetooth Low Energy), infrared communication, and wireless LAN.

  In particular, the processing unit (CPU) 20 of this embodiment includes a satellite operation information receiving unit 22, a satellite operation information updating unit 24, and a satellite operation information transmitting unit 26. Note that the processing unit (CPU) 20 of the present embodiment may have a configuration in which some of these configurations (elements) are omitted or a new configuration (element) is added.

  The satellite operation information receiving unit 22 performs a process of receiving satellite operation information from another electronic device 1 via the communication unit 70.

  For example, the satellite operation information receiving unit 22 may receive captured satellite information such as satellite identification information (for example, satellite number) of a GPS satellite captured by another electronic device 1 as the satellite operation information.

  Further, for example, the satellite operation information receiving unit 22 may receive orbit information of GPS satellites acquired by the other electronic device 1 as the satellite operation information. For example, the satellite operation information receiving unit 22 receives the general orbit information (almanac data) of all GPS satellites and the detailed orbit information (ephemeris data) of each GPS satellite acquired by the other electronic device 1 as the orbit information. The satellite operation information receiving unit 22 may receive orbit information after receiving captured satellite information from another electronic device 1.

  Further, for example, the satellite operation information receiving unit 22 may receive management information held by another electronic device 1 as the satellite operation information. The management information is information that supports calculation of position information, and is, for example, information on the reception intensity of a GPS satellite signal for each GPS satellite, information on a GPS satellite that was in a receivable position but could not be received, and the like. The satellite operation information receiving unit 22 may further receive management information after receiving orbit information from another electronic device 1.

  The satellite operation information update unit 24 collates the satellite operation information received by the satellite operation information reception unit 22 with the satellite operation information stored in the storage unit 130, and the satellite operation information reception unit 22 receives the result according to the comparison result. The satellite operation information list 132 is updated using the acquired satellite operation information.

  For example, when the satellite operation information of the same type as the satellite operation information received by the satellite operation information receiving unit 22 is not included in the satellite operation information list 132, the satellite operation information update unit 24 converts the satellite operation information into the satellite operation information. You may make it add to the information list 132. For example, if the satellite operation information receiving unit 22 receives almanac data and the satellite operation information list 132 does not include the almanac data, the almanac data may be added to the satellite operation information list 132. Also, for example, if the ephemeris data of the satellite number k is received by the satellite operation information receiving unit 22 and the ephemeris data of the satellite number k is not included in the satellite operation information list 132, the ephemeris data of the satellite number k is operated as the satellite operation. You may make it add to the information list 132. However, the satellite operation information update unit 24 may not add the information to the satellite operation information list 132 when the expiration date of the information to be added has expired.

  Further, for example, when the satellite operation information of the same type as the satellite operation information received by the satellite operation information receiving unit 22 is included in the satellite operation information list 132, the satellite operation information update unit 24 converts the satellite operation information into the satellite operation information. The satellite operation information list 132 may be updated by comparing with the same type of satellite operation information included in the information list 132 and selecting valid satellite operation information by calculating the position information. For example, the satellite operation information update unit 24 is added to each of the satellite operation information received by the satellite operation information reception unit 22 (for example, identification information of GPS satellites that can be captured, almanac data, ephemeris data of each GPS satellite, etc.). The time stamp and the time stamp attached to the same type of satellite operation information included in the satellite operation information list 132 are compared, and the satellite operation information list 132 is updated by selecting the newer satellite operation information. May be.

  By such processing of the satellite operation information receiving unit 22 and the satellite operation information updating unit 24, the satellite operation information list 132 is sequentially updated to information that is optimal for calculating position information.

  The satellite operation information transmission unit 26 transmits at least a part of the satellite operation information included in the satellite operation information list 132 via the communication unit 70 in response to a request for transmission of satellite operation information from another electronic device 1. The process which transmits to the electronic device 1 is performed.

  The satellite operation information transmitting unit 26 determines whether each of the satellite operation information included in the satellite operation information list 132 is information within the expiration date, and does not transmit the satellite operation information after the expiration date. Also good. Specifically, for example, prior to transmission, the satellite operation information transmitting unit 26 compares the time stamp attached to each satellite operation information included in the satellite operation information list 132 with the current time, and adds the satellite operation information to the satellite operation information. On the other hand, it is determined whether or not a preset expiration date has passed.

2-2. Mounting Example FIGS. 4 to 6 are explanatory diagrams of mounting examples of the GPS antenna 12 and the GPS module 10. In this embodiment, the GPS antenna 12 and the GPS module 20 are mounted on separate boards (printed boards) having substantially the same size. 4 to 6, illustration of some components mounted on each board is omitted.

  4A and 4B are a top view and a bottom view of the first board 80 on which the GPS antenna 12 is mounted, respectively. The GPS antenna 12 (patch antenna) is provided with a through hole at a position slightly deviated from the center of the surface thereof, and is fixed to the upper surface of the first board 80 by a pin 81 that passes through the through hole. Further, the first board 80 has an attachment portion 82 in which three through holes for attaching a 3-pin connector are formed, and an attachment portion 83 in which three through holes are attached for attaching other 3-pin connectors. Is provided. Further, an attachment portion 84 for attaching an RF cable connector is provided on the lower surface of the first board 80.

  5A and 5B are a top view and a bottom view of the second board 90 on which the GPS module 10 is mounted, respectively. The GPS module 10 (IC) is fixed to the upper surface of the second board 90. The first board 80 has an attachment portion 92 formed with three through holes for attaching a 3-pin connector, and an attachment portion 93 formed with three through holes for attaching another 3-pin connector. Is provided. Further, an attachment portion 94 for attaching an RF cable connector is provided on the upper surface of the second board 90. Further, an attachment portion 91 for attaching a 20-pin connector is provided on the lower surface of the second board 90.

  FIG. 6 is a schematic side view of a mounting example in which the first board 80 on which the GPS antenna 12 is mounted and the second board 90 on which the GPS module 20 is mounted are connected. In the mounting example of FIG. 6, the lower surface of the first board 80 and the upper surface of the second board 90 face each other, and the 3-pin connector 85 is inserted into the mounting portion 82 of the first board 80 and the mounting portion 92 of the second board 90. The first board 80 and the second board 90 are connected by inserting and attaching the 3-pin connector 86 to the attachment part 83 of the first board 80 and the attachment part 93 of the second board 90. Further, the connectors 96a and 96b at both ends of the RF cable 96 are respectively inserted and attached to the attachment portion 84 of the first board 80 and the attachment portion 94 of the second board 90, so that the GPS antenna 12 (patch antenna) and the GPS module 10 are attached. (IC) is electrically connected.

  A 20-pin connector 95 is attached to the attachment portion 91 on the lower surface of the second board 90, and the third board can be further overlapped and connected via the 20-pin connector 95. .

  For example, the GPS antenna 12, the GPS module 10, and the short-range wireless communication module are extremely connected by connecting a board on which a short-range wireless communication module including the processing unit 20 (CPU) and the communication unit 70 is mounted as the third board. Since it can be integrated in a small size and current consumption can be suppressed, it can be easily mounted on a portable device.

  Further, for example, by connecting a USB board capable of communicating with a PC as the third board, it is possible to easily evaluate a GPS receiver including the GPS antenna 12 and the GPS module.

  Further, for example, by connecting a board equipped with a memory card as the third board, a log of positioning data by the GPS receiver can be easily obtained.

  Since the first board 80 and the second board 30 can be easily separated by simply removing the 20-pin connectors 85 and 86, the first board 80 and the second board can be used according to the restrictions of the casing of the electronic device. 30 can also be arranged flexibly.

3. 3. Processing of electronic device 3-1. Overall Process of Position Information Calculation FIG. 7 is a flowchart showing an example of the overall process of position information calculation by the electronic device of this embodiment.

  As shown in FIG. 7, when a location information calculation event occurs (Y in S10), the electronic device 1 (1A) of the present embodiment first has other electronic devices 1 (1B, 1C,... Close-range wireless communication with each other and share satellite operation information (S20, short-range wireless communication processing). The position information calculation event may occur automatically, for example, when the electronic device 1A is turned on or when the electronic device 1A is returned from the standby mode in the intermittent operation, or may be irregular depending on the operation of the operation unit 30 by the user. It is also possible that this occurs.

  Next, the electronic device 1A updates the satellite operation information stored in the storage unit 130 using the satellite operation information received from the other electronic devices 1B, 1C,... As necessary (S30). Satellite operation information update process).

  Finally, the electronic device 1A calculates position information using the updated satellite operation information (S40, position information calculation process).

3-2. Near Field Communication Processing FIGS. 8 and 9 are flowcharts showing a specific example of the near field communication processing (S20) of FIG.

  FIG. 8 is a flowchart of processing in which the electronic device 1A receives satellite operation information from the other electronic devices 1B, 1C,. FIG. 9 is a flowchart of processing in which any of the electronic devices 1B, 1C,... Transmits satellite operation information to the electronic device 1A.

  First, the electronic device 1A transmits an inquiry signal to other unspecified electronic devices 1B, 1C,... At a short distance (S100).

  When the other electronic devices 1B, 1C,... Receive the inquiry signal from the electronic device 1A (Y of S150), the electronic devices 1B transmit a response signal to the electronic device 1A (S152).

  If none of the response signals from the electronic devices 1B, 1C,... Is received within the time limit (N in S102 and Y in S104), the electronic device 1A ends the processing. For example, there may be a case where there are no other electronic devices 1B, 1C,... Nearby or a poor communication environment.

  On the other hand, when a response signal from any one of the other electronic devices 1B, 1C,. ) Transmits a satellite operation information request signal (S106).

  If the electronic device 1B does not receive the satellite operation information request signal within the time limit (N in S154 and Y in S156), the electronic device 1B ends the process. For example, the case where the electronic device 1A or the electronic device 1B moves out of the short-range wireless communication range or the case where the communication environment is inferior can be considered.

  On the other hand, when the electronic device 1B receives the satellite operation information request signal within the time limit (Y in S154), communication between the electronic device 1A and the electronic device 1B is established, and the inquiry signal from the electronic device 1A is received. The other electronic device 1C cannot receive the satellite operation information request signal until the communication between the electronic device 1A and the electronic device 1B ends, and periodically transmits a response signal to the electronic device 1A. repeat.

  And the electronic device 1B performs the process which transmits satellite operation information to the electronic device 1A (S158-S172).

  Specifically, if the electronic device 1B stores the captured satellite information (satellite identification information of the captured GPS satellite) in the storage unit 130 (Y in S158), first, the electronic device 1B stores the captured satellite information in the electronic device 1A. Transmit (S160). The electronic device 1B has relatively high reception intensity among the captured GPS satellites as the captured satellite information together with the satellite identification information of the captured GPS satellite or instead of the satellite identification information of the captured GPS satellite. You may make it transmit the satellite identification information of a GPS satellite (the possibility that it can receive is relatively high).

  Next, if the electronic device 1B stores the approximate orbit information (almanac data) in the storage unit 130 (Y in S162), the electronic device 1B transmits the approximate orbit information (almanac data) to the electronic device 1A (S164).

  Next, when the electronic device 1B stores the detailed trajectory information (ephemeris data) in the storage unit 130 (Y in S166), the electronic device 1B transmits the detailed trajectory information (ephemeris data) to the electronic device 1A (S168).

  Finally, the electronic device 1B stores management information (information on the reception intensity of GPS satellite signals for each GPS satellite, information on GPS satellites at a receivable position but not received) in the storage unit 130. If this is the case (Y in S170), this management information is transmitted to the electronic device 1A (S172).

  The electronic device 1A sequentially receives satellite operation information (captured satellite information, approximate orbit information, detailed orbit information, management information) from the electronic device 1B, and temporarily stores the received satellite operation information in a storage unit (such as the RAM 60). Store (acquire) (S110).

  When the predetermined time limit has elapsed since the transmission of the satellite operation information request signal to the electronic device 1B (S106) (Y in S112), the electronic device 1A stops receiving the satellite operation information and communicates with the electronic device 1B. The process is forcibly terminated (S116). For example, the case where the electronic device 1A or the electronic device 1B moves out of the short-range wireless communication range or the case where the communication environment is inferior can be considered.

  When the electronic device 1B completes the transmission processing of all satellite operation information, the electronic device 1B transmits a transmission end signal to the electronic device 1A (S174), and ends the processing.

  When the electronic device 1A receives the transmission end signal from the electronic device 1B within the time limit (N in S112 and Y in S1114), the electronic device 1A ends the communication with the electronic device 1B (S116).

  Subsequently, when the electronic device 1A receives a response signal from one of the other electronic devices 1C,... Within the time limit (Y in S118), the electronic device 1A transmits the response signal. When the satellite operation information request signal is transmitted to (1C) (S106) and the electronic device 1C receives the satellite operation information request signal within the time limit (Y in S154), the electronic device 1A and the electronic device 1C Communication between them is established.

  Then, the electronic device 1C transmits the satellite operation information and the transmission end signal to the electronic device 1A (S158 to A174), and the electronic device 1A receives the satellite operation information and the transmission end signal (S108 to S116). The communication with 1C is terminated (S116).

  Similarly, the electronic device 1A receives (acquires) satellite operation information from other electronic devices until the time limit elapses (N in S120) (S106 to S116), and when the time limit elapses (Y in S120), The process ends.

3-3. Satellite Operation Information Update Process FIG. 10 is a flowchart showing a specific example of the satellite operation information update process (S30) of FIG.

  When the electronic device 1A fails to receive satellite operation information from another electronic device 1 in the short-range wireless communication process (S20) of FIG. 7 (N in S200), the process is terminated.

  On the other hand, when the electronic device 1A can receive satellite operation information from another electronic device 1 in the short-range wireless communication process (S20) of FIG. 7 (Y in S200), the same type of satellite operation information as the received satellite operation information is received. Is stored in the storage unit 130 (N in S202), the received satellite operation information is stored in the storage unit 130 (S210), and the satellite operation information list 132 is updated.

  If electronic device 1A stores the same type of satellite operation information as the received satellite operation information in storage unit 130 (Y in S202), the received satellite operation information and the satellite operation information stored in storage unit 130 are stored. And which one is more appropriate as a parameter used for calculating position information (S204). For example, if one of the received satellite operation information and the satellite operation information stored in the storage unit 130 is valid but the other is invalid, it is determined that the valid satellite operation information is more appropriate. Good. If both are valid, the time stamps may be compared to determine that newer satellite operation information is more appropriate.

  If the received satellite operation information is more appropriate (Y in S206), the satellite operation information list 132 is updated using the received satellite operation information (S208). On the other hand, when the satellite operation information stored in the storage unit 130 is more appropriate (N in S206), the satellite operation information list 132 is not updated.

  If there is unprocessed satellite operation information among all the satellite operation information received from the other electronic device 1 (Y in S212), the electronic device 1A performs the processing of S204 to S210 with respect to the unprocessed satellite operation information. If the process is performed and there is no unprocessed satellite operation information (N in S212), the process is terminated.

3-4. Position Information Calculation Process FIG. 11 is a flowchart showing a specific example of the position information calculation process (S40) of FIG.

  The electronic device 1A first refers to the satellite operation information list 132, and if the satellite operation information list 132 includes N or more effective detailed orbit information (ephemeris data) (Y in S300), the optimal N Individual detailed trajectory information (ephemeris data) is selected (S302), and positioning calculation is performed (S324). In this case, the position information calculation process at the hot start is performed. Here, when calculating a two-dimensional position in the positioning calculation, N = 3, and when calculating a three-dimensional position, N = 4.

  When the satellite operation information list 132 does not include N or more valid detailed orbit information (ephemeris data) (N in S300), the satellite operation information list 132 includes valid approximate orbit information (almanac data). If this is the case (Y in S304), the electronic device 1A grasps the positions of all the GPS satellites from this approximate orbit information (almanac data), and sets the priority of the satellite search to a higher position for GPS satellites that are more easily received. Then, the satellite search is started (S312). In this case, the position information calculation process is performed at the warm start.

  When the effective orbit information (almanac data) is not included in the satellite operation information list 132 (N in S304), the acquired satellite information (GPS satellites captured by the electronic device 1A or If the satellite identification information of the GPS satellites captured by the other electronic device 1 is included (Y in S308), the electronic device 1A prioritizes the receivable GPS satellites based on the captured satellite information and performs the satellite search order. Is set (S310) and satellite search is started (S312).

  If valid captured satellite information is not included in the satellite operation information list 132 (N in S308), the electronic device 1A starts a satellite search from the initial state (the same state as when the power is turned on) (S312). In this case, the position information calculation process is a cold start.

  If the electronic device 1 cannot start capturing the GPS satellite within the time limit after starting the satellite search (N in S314 and Y in S316), it ends the process. In this case, position information is not calculated.

  On the other hand, when the GPS satellite can be captured within the time limit (Y in S314), the electronic device 1 starts acquiring satellite information included in the navigation frame from the captured GPS satellite (S318). Note that the electronic device 1A continues to search for satellites even after capturing one GPS satellite and attempts to capture other GPS satellites.

  When the electronic device 1A fails to acquire N or more detailed trajectory information (ephemeris data) (N in S320 and Y in S322), the process is terminated. In this case, position information is not calculated. The case where N or more detailed orbit information (ephemeris data) could not be acquired means that N or more GPS satellites could not be captured or N or more GPS satellites could be captured, but N or more GPS satellites were captured. This corresponds to the case where detailed orbit information (ephemeris data) could not be acquired.

  On the other hand, when N or more detailed trajectory information (ephemeris data) can be acquired within the time limit (Y in S320), the electronic device 1A selects N detailed trajectory information (ephemeris data) and performs positioning calculation. Perform (S324).

  Then, the electronic apparatus 1A records the positioning data obtained by the positioning calculation in the storage unit 130 (S326), and ends the process.

  As described above, the electronic device 1 according to the present embodiment acquires satellite operation information from other electronic devices 1 that are close to each other. Therefore, the electronic device 1 is compared with information held by a remote server as in the server assist method. Thus, information that is extremely effective for calculating position information is obtained. Therefore, it is possible to effectively shorten the time required for the position information calculation process.

  In particular, in the present embodiment, it is assumed that the short-range communication time is short when the electronic device 1 or another electronic device 1 moves, and the other electronic device 1 has data necessary for calculating position information. In order from the satellite operation information with a small amount, specifically, the captured satellite information, the rough orbit information, the detailed orbit information, and the management information are transmitted in this order.

  The electronic device 1 of the present embodiment has already received the captured satellite information even if communication with another electronic device 1 becomes impossible during the reception of the approximate orbit information. By using the received captured satellite information, the electronic device 1 can try to acquire satellite information with priority from GPS satellites that are relatively likely to be captured by warm start. Accordingly, the time required for the position information calculation process can be shortened as compared with the cold start.

  Further, the electronic device 1 of the present embodiment has already received the captured satellite information and the approximate orbit information even if communication with the other electronic device 1 becomes impossible during the reception of the detailed orbit information. By using the received captured satellite information and the approximate orbit information, it is possible to try to acquire satellite information with priority from GPS satellites that are highly likely to be captured by warm start. That is, since the acquisition process of satellite information necessary for calculation of position information can be made efficient, the time required for the calculation process of position information can be shortened efficiently.

  In addition, when the electronic device 1 according to the present embodiment can receive up to detailed orbit information, the detailed orbit information is used to acquire all or part of the detailed orbit information necessary for calculating the position information from the GPS satellite. The processing to be performed can be omitted. In particular, if the satellite operation information list 132 already has the number of detailed orbit information necessary for the positioning calculation, the positioning calculation can be performed immediately by the hot start, so that the time required for the position information calculation process is greatly reduced. be able to.

  Furthermore, when the electronic apparatus 1 according to the present embodiment can receive even management information, the management information can be used to make the position information calculation process more efficient and improve the accuracy of positioning calculation.

  Moreover, the latest satellite operation information optimal for calculation of position information can be shared between the plurality of electronic devices 1 by transmitting and receiving the satellite operation information that is lacking between the plurality of electronic devices 1. . Thereby, each electronic device 1 can obtain a synergistic effect that shortens the calculation process of the position information.

4). Examples of use of electronic device Examples of use of the electronic device 1 include the following.

[Usage example 1]
For example, when one user carries a plurality of electronic devices 1 and performs short-range wireless communication between any two electronic devices 1, all the electronic devices 1 are optimal for calculating position information with respect to each other. Share satellite operation information. In this way, even if the satellite operation information generated for each electronic device 1 differs depending on the reception conditions and reception performance, the calculation time of the position information can be shortened by sharing the optimal satellite operation information. be able to.

[Usage example 2]
For example, when a certain user stays indoors where radio waves from GPS satellites do not reach for a long time, the expiration date of the satellite operation information stored in the electronic device 1 carried by the user may be considered. In such a case, when the electronic device 1 starts the calculation process of the position information when the user goes outdoors, the electronic device 1 carried by another user who is approaching while the user is moving is close to the electronic device 1. The position information calculation time can be shortened by receiving the satellite operation information by wireless communication.

[Usage example 3]
For example, when a plurality of users are indoors, an electronic device 1 carried by a first user who is in a position where radio waves reach such as by a window, and an electronic device 1 carried by a second user adjacent to the first user is short-range wireless communication. In addition, the electronic device 1 carried by the third user next to it receives the satellite operation information from the electronic device 1 carried by the second user by short-range wireless communication. Receive. As described above, the effective satellite operation information propagates through the plurality of electronic devices 1, so that the electronic device 1 in a position where the radio wave from the GPS satellite does not reach can also calculate the position information.

[Usage example 4]
For example, a user is on a moving body such as a vehicle, and the electronic device 1 carried by the user is close to another electronic device 1 (such as a GPS receiver of a car navigation system) fixed to the moving body. By performing distance wireless communication, satellite operation information that is optimal for calculating position information is acquired. In this way, the optimal satellite operation information can be acquired from the other electronic device 1 with good reception performance, and the calculation time of the position information can be shortened.

[Usage example 5]
For example, an electronic device 1 (such as a TV with a GPS reception function) fixed indoors performs short-range wireless communication with another electronic device 1 carried by the user, which is optimal for calculating position information. Satellite operation information is acquired (for example, position information is required when searching for a channel that can be received by a TV with a GPS reception function or when adjusting the time taking into account the time difference). In this way, even if the electronic device 1 is fixed indoors and has a poor reception environment, the optimal satellite operation information is acquired from the other movable electronic device 1 to shorten the calculation time of the position information. Can do.

  As the electronic device 1 of the present embodiment described above, for example, a mobile phone, a smartphone, a portable navigation device (PND), a portable information terminal (PDA: Personal Data Assistance) having a position display function, Various electronic devices such as portable devices such as digital cameras and activity meters, in-vehicle devices for car navigation systems, and electronic watches having time and time difference correction functions can be considered.

  In this embodiment, an electronic device that receives and measures a GPS satellite signal has been described as an example. However, the present invention is not limited to navigation satellites of other satellite navigation systems (satellite positioning systems) such as GLONASS and GALILEO. The present invention can also be applied to electronic devices that receive satellite signals and perform positioning.

  In addition, this invention is not limited to this embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention.

  For example, in the flowchart of FIG. 8, after the electronic device 1 </ b> A ends communication with the other electronic device 1 (S <b> 116), a process of transmitting satellite operation information regardless of whether there is a request from the other electronic device 1. You may make it perform. In this case, the other electronic device 1 may be able to select whether or not to receive satellite operation information from the electronic device 1A.

  For example, in the flowchart of FIG. 9, the electronic devices 1B, 1C,... Are each about satellite operation information (captured satellite information, general orbit information, detailed orbit information, management information) included in the satellite operation information list 132. Only valid satellite operation information (satellite operation information that has not expired) may be transmitted to the electronic apparatus 1A. In this way, since satellite operation information that cannot be used for calculation of position information is not transmitted unnecessarily, time and current consumption required for short-range wireless communication can be reduced.

  The present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. Further, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

1 electronic device, 2 GPS satellite, 10 GPS module, 12 GPS antenna, 14 TCXO, 20 processing unit (CPU), 22 satellite operation information receiving unit, 24 satellite operation information updating unit, 26 satellite operation information transmitting unit, 30 operation unit , 40 Display section, 50 ROM, 60 RAM, 70 Communication section, 80 First board, 81 pins, 82, 83, 84 Mounting section, 85, 863 Three pin connectors, 90 Second board, 91, 92, 93, 94 Attachment part, 95 20 pin connector, 96 RF cable, 96a, 96b connector, 100 SAW filter, 110 RF processing part, 120 baseband processing part, 122 satellite operation information generation part, 124 position information calculation part, 130 storage part, 132 Satellite operation information list

Claims (9)

An electronic device having a function of receiving a radio signal from a navigation satellite,
A satellite operation information generating unit that generates satellite operation information based on a radio signal received from a navigation satellite, and stores the generated satellite operation information in a storage unit;
A communication unit having a function of receiving a radio signal from a navigation satellite and performing direct wireless communication with another electronic device within a distance capable of direct wireless communication;
A satellite operation information receiving unit that receives satellite operation information from the other electronic device via the communication unit; and
The satellite operation information received by the satellite operation information receiving unit is compared with the satellite operation information stored in the storage unit, and according to the comparison result, the satellite operation information received by the satellite operation information receiving unit is used. A satellite operation information update unit for updating the satellite operation information stored in the storage unit;
An electronic device comprising: a position information calculation unit that calculates its own position information based on satellite operation information stored in the storage unit. In claim 1,
The satellite operation information receiving unit
An electronic device that receives captured satellite information that can identify a navigation satellite captured by the other electronic device as satellite operation information. In claim 1 or 2,
The satellite operation information receiving unit
Electronic equipment that receives orbit information that can identify the orbit of navigation satellites as satellite operation information. In any one of Claims 1 thru | or 3,
The satellite operation information receiving unit
An electronic device that receives management information that supports calculation of the position information as satellite operation information. In claim 2,
The satellite operation information receiving unit
An electronic device that receives orbit information that can specify the orbit of a navigation satellite as satellite operation information after receiving the captured satellite information. In claim 5,
The satellite operation information receiving unit
An electronic device that receives management information that supports calculation of the position information as satellite operation information after receiving the captured satellite information. In any one of Claims 1 thru | or 6.
The satellite operation information update unit
The satellite received by the satellite operation information receiving unit is compared with the time stamp attached to the satellite operation information received by the satellite operation information receiving unit and the time stamp attached to the satellite operation information stored in the storage unit. An electronic device that updates the satellite operation information stored in the storage unit to the satellite operation information received by the satellite operation information receiving unit when the operation information is newer than the satellite operation information stored in the storage unit. In any one of Claims 1 thru | or 7,
Satellite operation information transmission for transmitting at least a part of the satellite operation information stored in the storage unit to the other electronic device via the communication unit in response to a transmission request of the satellite operation information from another electronic device. The electronic device further includes a part. In claim 8,
The satellite operation information transmission unit
An electronic device that determines whether or not the satellite operation information stored in the storage unit is information within an expiration date, and does not transmit the satellite operation information after the expiration date.

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