JP2010038798A - Gps receiving apparatus and gps positioning system - Google Patents

Abstract

Provided is a GPS receiver and a GPS positioning system that can suppress the use of useless power during storage, and can perform quick positioning at startup without requiring troublesome operations during storage and reuse. To do.
SOLUTION: Detection means (20, 21) for detecting a movement state of a GPS receiving device and determining whether the device main body is in a moving state or a stationary state; and when the device main body shifts to a stationary state, GPS A power supply control means (16) for turning off the GPS power supply when the apparatus main body shifts to a moving state, and a navigation message acquisition means (10-12) capable of obtaining a navigation message via a communication network. When the apparatus main body shifts to a moving state, a navigation message is acquired via the navigation data acquisition means, and the navigation message stored in the storage means (19) is updated with the acquired navigation message. .
[Selection] Figure 1

Description

  The present invention relates to a GPS receiver that performs positioning by receiving a signal from a GPS satellite, and a GPS positioning system that includes the GPS receiver and a server device.

  2. Description of the Related Art GPS receivers that receive radio waves from a GPS (Global Positioning System) satellite and measure the current position have been known.

  Devices that use GPS receivers include car navigation devices that are installed in cars and output current information to the destination while measuring the current position, and in recent years, they have been reduced in size to be portable and simple navigation. PND (Personal Navigation Device) to be performed has been developed. The PND can be used while walking, or attached to a car and used during driving.

  For accurate positioning using GPS, positioning codes (positioning signals) such as C / A (Coarse and Acquisitions) codes and P (Precise) codes transmitted from GPS satellites, and navigation messages transmitted from GPS satellites (Ephemeris, almanac, time correction data, ionospheric correction data, etc.) are required. Of these, the navigation message takes a relatively long time (for example, 10 minutes or more) to receive all, but it is not necessary to receive it every positioning, and once it is received, until the predetermined expiration date is passed, It becomes possible to perform accurate positioning using the navigation message received last time.

  In PND and the like, the expiration date of the navigation message received last time during storage is often exceeded, so normally it is necessary to start from reception of the navigation message at the start of use, and positioning is possible. May take a relatively long time to complete.

Thus, some proposals have been made to enable quick positioning even when the navigation message previously received and stored in the GPS receiver has exceeded the expiration date. For example, Patent Document 1 discloses a GPS receiver that receives a necessary navigation message by e-mail or the like from a GPS assist server that regularly collects navigation messages and performs positioning using the navigation message. Yes. Further, Patent Document 2 includes a GPS reception device having a communication function, periodically receiving positioning assist information transmitted from a radio base station, and periodically updating positioning assist information stored therein. Is disclosed. Patent Document 3 discloses a configuration in which a navigation message transmitted from a GPS satellite is received by a GPS monitoring server, and the GPS monitoring server transmits GPS auxiliary information in the navigation message from an FM multiplex broadcast station.
JP 2000-275319 A JP 2002-221565 A JP 2002-228739 A

  However, in the GPS receiver of Patent Document 1, when starting use from the storage state, it is confirmed whether the navigation message stored in the receiver has exceeded the expiration date, or the expiration date has passed. In such a case, there is a problem that a complicated operation is required for the user, for example, the user needs to perform an operation of sending a mail requesting acquisition of a navigation message. In the first place, for users who repeat the operation of attaching and using the PND in a car on a daily basis or removing it after use and storing it in the room, turn off the PND when storing it, and turn on the PND when starting use. It is considered that it is troublesome for the user to confirm the expiration date of the navigation message or to send an e-mail at the start of use.

  Further, in the configurations of Patent Documents 2 and 3, it is necessary to supply power to the receiving unit at all times or periodically to perform data receiving operation even during storage, and in a battery-driven type GPS receiving device, There is a drawback that the battery runs out even during storage. In addition, if the storage location is a place where radio waves do not reach, there is a disadvantage that data necessary for positioning cannot be received.

  An object of the present invention is to provide a GPS receiver and a GPS positioning device that can suppress the use of useless power during storage, and can perform quick positioning at startup without requiring troublesome operations during storage and reuse. To provide a system.

In order to achieve the above object, the invention according to claim 1
Receiving means for receiving positioning signals and navigation messages transmitted from GPS satellites;
Storage means for storing the navigation message received by the receiving means;
Positioning means for calculating the current position from the positioning signal received by the receiving means and the navigation message stored in the storage means;
In a GPS receiver having
Determining means for detecting the movement state of the device body of the GPS receiver and determining whether the device body is in a moving state or a stationary state;
When the determining means determines that the apparatus main body has shifted from the moving state to the stationary state, the power of the receiving means and the positioning means is turned on, and it is determined that the apparatus main body has shifted from the stationary state to the moving state. Power supply control means for turning off all or part of the power supply of the receiving means and the positioning means,
Navigation message acquisition means capable of acquiring a navigation message from outside without going through the receiving means;
When it is determined by the determination means that the device main body has shifted from a stationary state to a movement state, a navigation message is acquired via the navigation message acquisition means, and the acquired navigation message is stored in the storage means A navigation message updating means for updating the navigation message;
It is characterized by having.

The invention according to claim 2 is the GPS receiver according to claim 1,
The discrimination means includes
An acceleration sensor for detecting an acceleration applied to the device body;
A calculation means for calculating the speed of the apparatus main body based on a detection value of the acceleration sensor;
State determining means for determining whether the apparatus main body is in a moving state or a stationary state based on a detection value of the acceleration sensor and a speed value calculated by the calculating means;
It is characterized by having.

The invention according to claim 3 is the GPS receiver according to claim 1,
The navigation message acquisition means includes:
A communication means for communicating with an external device in which new navigation messages are sequentially stored;
A communication control means for transmitting a transfer request for a new navigation message to the external device via the communication means, and receiving a navigation message transmitted from the external device based on the transfer request;
It is characterized by having.

The invention according to claim 4 is the GPS receiver according to claim 3,
The communication means includes
It is configured to connect to the Internet via a wireless LAN,
The communication control means includes
The communication means is configured to obtain a navigation message from the outside via the Internet.

The invention according to claim 5 is the GPS receiver according to claim 3,
The communication control means includes
When the navigation message transfer request is made, the current position information previously measured by the positioning means is transmitted, and the navigation message corresponding to the current position information is received.

The invention according to claim 6 is the GPS receiver according to claim 1,
The navigation message update means includes:
When it is determined by the determining means that the apparatus main body has shifted from the stationary state to the moving state, it has time limit determining means for determining whether or not the expiration date of the navigation message stored in the storage means has passed. ,
When the expiration date determining means determines that the expiration date has passed, the navigation message acquisition means acquires the navigation message and updates the navigation message stored in the storage means. .

The invention according to claim 7 is the GPS receiver according to claim 1,
Having a battery mounting section,
The receiving unit and the positioning unit are configured to be driven by a power source of a battery mounted on the battery mounting unit.

The invention described in claim 8
A GPS receiving system comprising the GPS receiving device according to claim 1 and a server device connected to a network.
The server device
Storage means for storing new navigation messages sequentially;
A communication means for communicating via a communication network;
Communication control means for transmitting a navigation message stored in the storage means in response to a transfer request from the GPS receiving device via the communication network;
With
The navigation message acquisition means in the GPS receiver is
Communication means for communicating via the communication network;
Communication control means for connecting to the server device via the communication network by the communication means, requesting the server device to transfer a new navigation message, and receiving the navigation message from the server device;
It is characterized by having.

The invention according to claim 9 is the GPS positioning system according to claim 8,
The communication control means in the GPS receiver is
When the transfer request for the new navigation message is requested, information on the current position previously measured by the positioning means is transmitted.
The communication control means of the server device includes:
When the current position information is received from the GPS receiver, a new navigation message corresponding to the current position is read from the storage means and transmitted to the GPS receiver.

  According to the present invention, it is possible to reduce unnecessary power consumption in the storage state without restarting the user during storage or reuse, or to restart the supply of power necessary for reuse and perform the positioning operation. be able to. Furthermore, at the time of reuse, it is possible to obtain a new navigation message from other than the GPS satellite and perform quick positioning without requiring troublesome operations.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing an overall configuration of a GPS receiver according to an embodiment of the present invention.

  The GPS receiver 1 of this embodiment is, for example, a PND (Personal Navigation Device) that is miniaturized so as to be portable and that measures the current position and performs a simple navigation operation. As shown in FIG. 1, the GPS receiver 1 includes a pseudo-distance between a GPS antenna 14 that receives positioning signals and navigation message signals from GPS satellites, and at least four GPS satellites from positioning signals and navigation messages. A GPS positioning calculation device 15 that obtains satellite orbits and calculates the current position therefrom, a display device 13 that outputs positioning information, navigation information, and the like, a CPU (central processing unit) 16 that performs overall control of the device, Obtained by the final position information storage memory 17 in which the latest calculated position information is stored, the map database 18 in which map data is stored in, for example, a non-volatile memory, and reception from GPS satellites or data communication via the Internet Equipped with an ephemeris storage memory 19 for storing navigation messages (eg, ephemeris data) To have.

  Further, the GPS receiver 1 includes a wireless LAN antenna 10 that transmits and receives wireless signals to and from other wireless LAN (Local Area Network) devices, and a network that performs mutual conversion between transmission and reception signals and communication data in accordance with communication rules. The control device 11, the Internet connection device 12 that performs communication processing for connecting to the Internet by data communication via the wireless LAN antenna 10, the acceleration sensor 20 that detects the motion state of the device body, and the output data of the acceleration sensor 20 For example, a movement determination apparatus 21 that generates a determination signal for the movement state of the apparatus main body, and a power supply 22 that is mounted with a battery such as a secondary battery and supplies a power supply voltage to each unit.

  The wireless LAN antenna 10 has, for example, a WiFi (registered trademark) standard configuration, and can be wirelessly connected with low power to a home wireless LAN in which connection settings have been made in advance. The network control device 11 converts transmission data sent from the CPU 16 or the Internet connection device 12 into a signal of a predetermined communication method and transmits it from the wireless LAN antenna 10 or receives it from a reception signal via the wireless LAN antenna 10. Data communication is performed with other wireless LAN devices by reproducing the data and sending it to the CPU 16 and the Internet connection device 12. The Internet connection device 12 enables data communication via the Internet by performing data conversion according to the Internet protocol between the CPU 16 and the network control device 11.

  The CPU 16 executes a control program stored in a non-illustrated non-volatile memory and uses the unillustrated RAM (Random Access Memory) as a working memory space to perform overall control processing of the device. It is. The CPU 16 also functions as communication control means for performing communication by communication means such as the network control device 11 and the Internet connection device 12.

  Although the final position information storage memory 17 and the ephemeris storage memory 19 are illustrated as separate configurations in the drawing, they are formed as a partial storage area such as one static RAM or one nonvolatile memory. Is.

  The acceleration sensor 20 is, for example, a three-dimensional acceleration sensor, and can detect the acceleration by discriminating between the vertical direction and the horizontal direction by taking the difference between the acceleration and the gravitational acceleration as a reference acceleration. is there. Note that a gyroscope or the like may be mounted to detect the rotation direction at the same time.

  The movement determination device 21 is a processing device that takes in a detection signal from the acceleration sensor 20 and determines the movement state of the apparatus main body. The movement determination device 21 continues to determine the movement state of the apparatus main body even when the CPU 16 enters the sleep state, and outputs a sleep release signal to the CPU 16 when the apparatus main body shifts from the stationary state to the movement state. Thus, the sleep state of the CPU 16 can be canceled.

  The power supply 22 can turn on (supplied) / off (stopped) the GPS power supplied to the GPS positioning calculation device 15 and the GPS antenna 14 based on a command from the CPU 16, for example. Further, it is possible to turn off the power supplied to each part except for the acceleration sensor 20 and the movement determination device 21 or to switch to supply for the sleep mode according to a command from the CPU 16.

  FIG. 2 is a system configuration diagram showing the configuration of the GPS positioning system according to the embodiment of the present invention.

  As shown in FIG. 2, the GPS positioning system according to the present embodiment includes the GPS receiver 1 described above and a server device 30 connected to the Internet 40.

  The server device 30 is connected to, for example, a CPU 31 that performs communication control, a RAM 32 that provides a working memory space to the CPU 31, a storage device 33 that stores control programs and control data, and the Internet 40 for data communication. A communication processing unit 34 that performs processing is provided.

  The server device 30 operates so as to store the navigation message transmitted from the GPS satellite in the storage device 33, for example, by being transmitted from another receiving device connected to the communication network. Since the navigation message is updated every predetermined time, a new navigation message is received every time it is updated, and the latest navigation message is stored. Note that the server device 30 may be configured to directly receive a navigation message from a GPS satellite and store the directly received navigation message.

  The navigation message stored in the storage device 33 is ephemeris data, for example, and a plurality of latest ephemeris data received from a plurality of GPS satellites is stored in the storage device 33.

  In addition, the server device 30 always executes site processing (FIG. 4), which will be described later, and can be accessed from a pre-registered device via the Internet 40 and accessed. A predetermined process is executed.

  In FIG. 3, the flowchart of the terminal process performed by the GPS receiver 1 is shown. FIG. 4 shows a flowchart of site processing executed by the server device 30.

  The GPS receiver 1 is always in a state in which the terminal process of FIG. 3 is executed. This terminal processing includes processing when the GPS receiver 1 is normally used, processing when the GPS receiving device 1 is stopped such as during storage, and processing when resuming use.

[Normal use status processing]
First, processing when the GPS receiver 1 is in a normal use state will be described. For example, when the GPS receiver 1 is taken out and used, the loop process of steps S1 to S9 is repeatedly executed in the terminal process of FIG.

  First, in step S1, the movement determination device 21 takes acceleration data from the acceleration sensor 20, and determines whether or not the acceleration is zero in step S2. If the acceleration is not zero, in step S3, speed calculation is performed from the acceleration data to update the speed data stored internally. On the other hand, if it is determined that the acceleration is zero, the speed data stored internally in step S4 is taken out, and it is determined in step S5 whether the speed is zero. If it is determined in step S5 that the speed is not zero, the process proceeds to subsequent step S6.

  That is, it is determined by the processes in steps S1 to S5 that either the speed or the acceleration is not zero, and it is determined that the GPS receiver 1 is in the moving state.

  When it is determined that the GPS receiver 1 is in the moving state and the process proceeds to step S6, it is determined whether the GPS power source from the power source 22 is turned on or off in step S6. Since the GPS power source is turned off as described later when it is determined that the apparatus main body is in a stopped state, it can be determined that the GPS power source was in the moving state even in the previous loop processing.

  In the normal use state, since the apparatus main body continues to move and the GPS power source is kept on, the process proceeds to step S7 as a result of the determination process in step S6.

  In step S7, the GPS positioning operation device 15 and the GPS antenna 14 are operated to perform GPS satellite signal reception processing, and it is determined whether or not the GPS satellite is supplemented. If supplemented, the process proceeds to step S 8, where the current position calculation process is performed using the positioning signal received by the GPS positioning calculation device 15 and the ephemeris data stored in the storage memory 19. When the current position is calculated, the current position information is stored in the final position information storage memory 17.

  When the GPS satellite signal is received, if an updated navigation message (ephemeris data, for example) is being transmitted, it is received and the latest ephemeris data is stored in the storage memory 19. Update ephemeris data.

  When the current position is calculated in step S8, display processing such as outputting display data representing the current position on a map to the display device 13 is performed in subsequent step S9. This display data is generated, for example, by reading out map data around the current position from the map database 18 and adding display data representing the current position to a part corresponding to the current position of the map data.

  When the display process in step S9 is completed, the process returns to step S1 again, and the loop process from step S1 is repeated.

  By repeating the loop processing of steps S1 to S9, when the GPS receiver 1 is in a moving state, GPS reception is performed, and the current position is measured and its display processing is repeated. ing.

Stop status processing
Next, a process when the apparatus main body is in a stopped state such as after use of the GPS receiving apparatus 1 will be described. For example, when the GPS receiving apparatus 1 is stopped due to being placed in a storage place or the like, both the stopped state are detected by the acceleration determination process (step S2) and the speed determination process (step S5). It is determined by becoming zero.

  When the GPS receiver 1 is determined to be in a stopped state in this way, the process proceeds to step S10 and the CPU 16 outputs a command code to the power source 22 to stop the supply of GPS power. And it returns to step S1 again.

  When the GPS receiver 1 continues in a stopped state, the loop processing of steps S1, S2, S4, S5, and S10 is repeated, so that the GPS receiver 1 is in an operating state while the GPS power is off. Monitoring will continue if there is no transition.

  Note that the processing in the stopped state is transferred not only when the GPS receiving device 1 is stored after use, but also when the GPS receiving device 1 is temporarily stopped during use, for example. However, since the current position does not change during the temporary stop, there is no need to update the display on the display device 13 or perform GPS reception processing, so the process proceeds to the loop processing of steps S1, S2, S4, S5, and S10. As a result, wasteful power consumption can be reduced.

  In order to distinguish between a pause in use and a stopped state in the storage state, it is determined whether a state in which both acceleration and speed are zero continues for a predetermined period or a predetermined number of times, and continues for a predetermined period or a predetermined number of times. If it is determined that the storage device is in a storage state after use, the display device 13 is turned off, and other configurations except for the acceleration sensor 20 and the movement determination device 21 necessary for restarting are in the sleep mode state. You may comprise so that it may transfer to.

[Transition process from stationary to moving]
Next, processing when the device main body of the GPS receiving device 1 changes from the stopped state to the moving state again will be described. The determination of the transition from the stopped state to the moving state is performed by the acceleration / speed determination process in step S2 or S5 and the GPS power on / off determination process in step S6. That is, when the device body of the GPS receiver 1 is changed to the moving state, the acceleration or the speed is not zero, and the process proceeds to step S6 by the determination processing in steps S2 and S5. Further, if the previous state is the stop state, the GPS power source is turned off by the process of step S10. Therefore, when it is determined in step S6 that the GPS power source is off, the transition is made from the stop state to the moving state. Is determined.

  When it is determined that the GPS receiving apparatus 1 has shifted from the stopped state to the moving state, the process proceeds to step S11. First, in step S11, a command code is output to the power supply 22 to turn on the GPS power supply (supply state). In the case of shifting to the sleep mode, the movement determination device 21 outputs a sleep cancel signal to the CPU 16, thereby canceling the sleep mode of the CPU 16 and setting the power supply 22 to the normal mode by a command code from the CPU 16. The sleep mode of each part is also canceled.

  When the GPS power supply is turned on, it is determined in subsequent step S12 whether the ephemeris data stored in the ephemeris storage memory 19 is new or old. The acquisition time information may be determined from the time information of the navigation message stored together with the ephemeris data, or when the ephemeris data is stored in the storage memory 19, the time data is also added and stored. You may make it discriminate | determine from this time data. As a result, if it is determined that the acquisition time is old and the expiration date of the ephemeris data has passed, the process proceeds to step S13. If it is determined that the acquisition time is new and the expiration date of the ephemeris data has not passed, the step is performed. The process proceeds to S7.

  That is, when the GPS receiver 1 shifts to an operating state from a temporary stop, the ephemeris data stored in the storage memory 19 can be used as it is, so the process returns to step S7 and again the step of the normal use state. Returning to the loop processing of S1 to S9.

  On the other hand, when the ephemeris data stored in the storage memory 19 is old and cannot be used, for example, when the GPS receiver 1 is used after being stored for a certain period of time, first, in step S13, the network controller 11 Wireless connection processing is performed via the wireless LAN antenna 10 to determine whether there is a wireless LAN device that can be connected nearby. If there is a connectable wireless LAN device, wireless connection processing with this wireless LAN device is performed in the subsequent step S14. With this wireless connection, the GPS receiving device 1 becomes accessible to the server device 30 via the Internet 40.

  When the server device 30 becomes accessible, next, in step S15, the CPU 16 reads the previously calculated position information (previous position information) stored in the final position information storage memory 17 and stores it in the server device 30. Send to. The previous position information is equivalent to information representing the current position information because the GPS receiver 1 should have been stopped since the previous calculation.

  By the way, in the server apparatus 30, the site process shown in FIG. 4 is always in a state of being executed by parallel processing or the like. And it is always monitored whether there is access from the GPS receiver 1 by the loop process of step S21. Therefore, when the previous position information is sent from the GPS receiving apparatus 1 to the server apparatus 30, this is detected by the server apparatus 30 and the process proceeds to step S22, and the previous position information is received in step S22. In addition, when the access from the GPS receiving device 1 to the server device 30 is performed, a preset authentication process may be performed.

  When receiving the previous position information, in the next step S23, the server device 30 is a position that is easily received in the same area as the received previous position information among the ephemeris data of the plurality of GPS satellites stored in the storage device 33. The ephemeris data (the latest ephemeris data corresponding to the position information) of a predetermined number of GPS satellites existing in is searched.

  In step S24, the searched ephemeris data is transmitted to the GPS receiver 1, and the process returns to step S21 again.

  In the GPS receiver 1, after transmitting the previous position information to the server device 30 in step S15 of FIG. 3, the response reception process from the server device 30 is repeated in step S16. When the latest ephemeris data is received from the server device 30, the process proceeds to step S17, and the ephemeris data stored in the storage memory 19 is updated to the latest one.

  After updating the ephemeris data, the process proceeds to step S7 and returns to the loop process of steps S1 to S9 in the normal use state again. In this loop processing, it is possible to quickly calculate the current position and display the current position using the latest ephemeris data.

  On the other hand, if it is determined that there is no wireless LAN device that can be wirelessly connected to the outside in the determination process of the presence or absence of the wireless LAN device in step S13 described above, the ephemeris data in the storage memory 19 remains obsolete and the process moves to step S7. Again, the process returns to the loop processing of steps S1 to S9 in the normal use state. In this case, although a relatively long time is required, new ephemeris data is received from the GPS satellite and the current position is calculated.

  As described above, according to the GPS receiver 1 of this embodiment, the acceleration sensor 20 and the movement determination device 21 are used to detect whether the GPS receiver 1 is in a moving state or in a stopped state, and in the stopped state. If there is, the GPS power supply is turned off, and the GPS power supply is turned on when the operation state is changed from the stopped state, so that useless power consumption can be reduced. In addition, if the stop state continues to some extent, it is put into a sleep state except for the configuration necessary for restart, and when the transition from the stop state to the operation state, the GPS power supply is turned on and other configurations are returned from the sleeve state. The user can switch the GPS receiver 1 from the state suitable for storage to the normal use state without performing complicated operations when storing after use or when starting use from the storage state. Since the power consumption is very small in the storage state, the battery power supply is not consumed quickly.

  Further, according to the GPS positioning system including the GPS receiver 1 and the server device 30 of this embodiment, when the GPS receiver 1 is resumed from the storage state, the GPS receiver 1 shifts from the stopped state to the moving state. Then, the wireless LAN connection is automatically made based on this, and the ephemeris data corresponding to the point is acquired from the server device 30 via the network. Therefore, the user can start measurement of the current position promptly using this ephemeris data without performing any complicated operation. Further, even when storing for a long period, the ephemeris data is not updated during the storage, so that the battery power supply is not consumed quickly.

  In addition, since the acceleration sensor 20 and the movement determination device 21 are used to detect the operation state of the GPS receiver 1, the operation state can be detected at low cost and with low power consumption.

  In addition, as the configuration for receiving the latest ephemeris data from the server device 30, data communication via a wireless LAN and the Internet is adopted, so that reliable data acquisition is possible at low cost and with low power consumption.

  Further, when the ephemeris data transfer request is made to the server device 30, the ephemeris data suitable for the current position of the GPS receiver 1 is obtained because the transfer request is made by transmitting the previous position information. The effect that quick positioning can be started by the data communication is obtained.

  Even when the GPS receiver 1 shifts from the stationary state to the operating state, it is once confirmed whether or not the ephemeris data in the storage memory 19 has expired, and only when the expiration date has passed, the server device 30. Since the ephemeris data is acquired from the data, unnecessary data communication can be omitted when the operation state is shifted from the temporary stop.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above-described embodiment, an example in which a portable PND is applied as the GPS receiver 1 has been described. However, the present invention can also be applied to a type of car navigation installed in a car. It can also be applied to a GPS receiver of a type that displays positioning information in latitude and longitude, or it can be applied to a GPS receiver that does not have a display device, stores positioning information as a history, and can later be loaded into a computer. Is possible.

  In addition, details shown in the embodiment such as a method for detecting the movement state of the apparatus main body and a communication form between the GPS receiver 1 and the server apparatus 30 can be appropriately changed without departing from the spirit of the invention.

It is a block diagram which shows the whole structure of the GPS receiver of embodiment of this invention. It is a system configuration figure showing the composition of the GPS positioning system of the embodiment of the present invention. It is a flowchart which shows the procedure of the control processing performed by CPU of a GPS receiver. It is a flowchart which shows the procedure of the control processing performed by a server apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 GPS receiver 10 Wireless LAN antenna 11 Network controller 12 Internet connection apparatus 13 Display apparatus 14 GPS antenna 15 GPS positioning calculating apparatus 16 CPU
17 Final position information storage memory 18 Map database 19 Ephemeris storage memory 20 Acceleration sensor 21 Movement determination device 22 Power supply

Claims (9)

Receiving means for receiving positioning signals and navigation messages transmitted from GPS satellites;
Storage means for storing the navigation message received by the receiving means;
Positioning means for calculating the current position from the positioning signal received by the receiving means and the navigation message stored in the storage means;
In a GPS receiver having
Determining means for detecting the movement state of the device body of the GPS receiver and determining whether the device body is in a moving state or a stationary state;
When the determining means determines that the apparatus main body has shifted from the moving state to the stationary state, the power of the receiving means and the positioning means is turned on, and it is determined that the apparatus main body has shifted from the stationary state to the moving state. Power supply control means for turning off all or part of the power supply of the receiving means and the positioning means,
Navigation message acquisition means capable of acquiring a navigation message from outside without going through the receiving means;
When it is determined by the determination means that the device main body has shifted from a stationary state to a moving state, a navigation message is acquired via the navigation message acquisition means, and the acquired navigation message is stored in the storage means A navigation message updating means for updating the navigation message;
A GPS receiver characterized by comprising: The discrimination means includes
An acceleration sensor for detecting an acceleration applied to the device body;
A calculation means for calculating the speed of the apparatus main body based on a detection value of the acceleration sensor;
State determining means for determining whether the apparatus main body is in a moving state or a stationary state based on a detection value of the acceleration sensor and a speed value calculated by the calculating means;
The GPS receiver according to claim 1, comprising: The navigation message acquisition means includes:
A communication means for communicating with an external device in which new navigation messages are sequentially stored;
A communication control means for transmitting a transfer request for a new navigation message to the external device via the communication means, and receiving a navigation message transmitted from the external device based on the transfer request;
The GPS receiver according to claim 1, further comprising: The communication means includes
It is configured to connect to the Internet via a wireless LAN,
The communication control means includes
4. The GPS receiving apparatus according to claim 3, wherein a navigation message is acquired from the outside by the communication means via the Internet. The communication control means includes
The configuration is such that, when the navigation message transfer request is made, information on a current position previously determined by the positioning means is transmitted, and a navigation message corresponding to the information on the current position is received. 3. The GPS receiver according to 3. The navigation message update means includes:
When it is determined by the determining means that the apparatus main body has shifted from the stationary state to the moving state, it has a time limit determining means for determining whether or not the expiration date of the navigation message stored in the storage means has passed. ,
When it is determined by the time limit determining means that the expiration date has passed, the navigation message acquiring means acquires the navigation message and updates the navigation message stored in the storage means. The GPS receiver according to claim 1. Having a battery mounting section,
2. The GPS receiver according to claim 1, wherein the receiving unit and the positioning unit are driven by a power source of a battery mounted on the battery mounting unit. A GPS receiving system comprising the GPS receiving device according to claim 1 and a server device connected to a network.
The server device
Storage means for storing new navigation messages sequentially;
A communication means for communicating via a communication network;
Communication control means for transmitting a navigation message stored in the storage means in response to a transfer request from the GPS receiving device via the communication network;
With
The navigation message acquisition means in the GPS receiver is
Communication means for communicating via the communication network;
Communication control means for connecting to the server device via the communication network by the communication means, requesting the server device to transfer a new navigation message, and receiving the navigation message from the server device;
A GPS positioning system characterized by comprising: The communication control means in the GPS receiver is
When the transfer request for the new navigation message is requested, information on the current position previously measured by the positioning means is transmitted.
The communication control means of the server device includes:
9. A configuration in which when a current position information is received from the GPS receiver, a new navigation message corresponding to the current position is read from the storage means and transmitted to the GPS receiver. GPS positioning system.

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