JP2008225856A - Antitheft device for car navigation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent theft of a car navigation apparatus by a new structure completely different from existing known structures. <P>SOLUTION: The antitheft device for a car navigation apparatus 1 stores in advance a visible range of GPS satellites visible to a GPS antenna 20 of a GPS receiver 15 as a criterion visible range in a storage means, and when the car navigation apparatus 1 is started, acquires a visible range of GPS satellites visible to the GPS antenna 20, compares the visible range with the stored criterion visible range and, if they do not match, restricts the operation of the car navigation apparatus 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an anti-theft device for a car navigation device that can prevent the theft of a car navigation device mounted on a vehicle.

  As an example of an antitheft device for a car navigation device, a configuration described in Patent Document 1 is known. In this configuration, the position of the vehicle (position of the car navigation device) when the use of the previous car navigation device is completed, that is, when the engine of the vehicle is stopped is stored, and the vehicle position detected when starting the next engine is stored. And whether or not the stored vehicle position matches. When the two do not match, a predetermined password is input. When the password is not input, it is determined that the car navigation device has been stolen and the car navigation device is not operated.

According to the above configuration, even if the stolen car navigation device is attached to the vehicle, it cannot be operated, so that the car navigation device has no value. This eliminates the value of stealing the car navigation device, thereby preventing the car navigation device from being stolen.
Japanese Patent Laid-Open No. 2001-184568

  The configuration described in Patent Document 1 has an effect of sufficiently preventing the car navigation device from being stolen. On the other hand, the inventor tried to invent a configuration that can prevent the car navigation device from being stolen by a novel configuration that is completely different from the configuration described in Patent Document 1.

  An object of the present invention is to provide an antitheft device for a car navigation device that can prevent the car navigation device from being stolen with a novel configuration that is completely different from the known configuration.

  According to the first aspect of the present invention, the visible range of the GPS satellite that can be seen by the GPS antenna of the GPS receiver is stored in advance in the storage means as the visible range for determination, and when the car navigation device is started, the GPS antenna The visible range of the visible GPS satellite is obtained by comparing the visible range with the stored visible range for determination, and when the two do not match, the car navigation device is restricted from operating. The car navigation device can be prevented from being stolen by a novel configuration completely different from the above configuration.

  According to the invention of claim 2, when the visible range and the visible range for determination do not match, the user is prompted to input an authentication password, and when the authentication password is input, car navigation Since the device is configured to operate, the car navigation device can be operated by any authorized user of the car navigation device (ie, a user who knows the password for authentication).

  Further, in the case of the above configuration, as in the invention of claim 3, when the vehicle is parked at home, the visible range of the GPS satellite visible by the GPS antenna is stored in the storage means as the visible range for determination. It is preferable to configure. Furthermore, it is more preferable that the visible range of the GPS satellite visible by the GPS antenna is displayed on the display device as a GPS satellite visible map.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, FIG. 1 is a block diagram schematically showing an electrical configuration of the car navigation apparatus 1 of the present embodiment. As shown in FIG. 1, a car navigation device 1 includes a control device 2, a position detector 3, a map data input device 4, an operation switch group 5, a transceiver 6, an external memory 7, and a display device. 8, a voice controller 9, a voice recognition device 10, a remote control sensor 11, and a communication I / F 12. In the case of the present embodiment, the car navigation device 1 also has a function as an anti-theft device.

  The control device 2 has a function of controlling the overall operation of the car navigation device 1, and includes a CPU, a ROM, a RAM, an SRAM, a flash memory, various I / Os, and a bus connecting them (all illustrated). Not configured). The control device 2 constitutes storage means and control means.

  The position detector 3 includes a gyroscope 13, a distance sensor 14, and a GPS (Global Positioning System) receiver 15. The position detector 3 is configured to detect the current position of the vehicle while interpolating with each other by the three sensors 13 to 15, and has a highly accurate position detection function. In addition, when position detection accuracy is not so required, the position detector 3 may be configured by any one of the three sensors 13 to 15 (or a combination of a plurality of sensors). Further, the position detector 3 may be configured by appropriately combining a vehicle steering rotation sensor, a wheel sensor, a vehicle tilt sensor, and the like.

  The map data input device 4 is composed of a reader capable of reading a CD-ROM, DVD-ROM, HDD, memory, etc., and includes map data, map matching data, landmark data, voice recognition dictionary data, travel rules. It is a device for inputting various data such as a database. Here, the map data, the map matching data, the landmark data, and the speech recognition dictionary data may be appropriately used well-known data used in a normal car navigation device.

  The operation switch group 5 includes a touch switch (touch panel) provided on the upper surface of the display screen of the display device 8 and a mechanical push switch (not shown) provided on the periphery of the display device 8. . Further, the user (driver) is configured to be able to give an operation signal to the control device 2 via the remote control sensor 11 by operating the remote control 16.

  The transceiver 6 is composed of, for example, a VICS communication device, a mobile phone (a dedicated mobile phone terminal, a general-purpose mobile phone, or the like). The control device 2 is configured to be able to transmit / receive data to / from an external information supply center such as the VICS center 17 and various information centers via the transceiver 6. The external memory 7 is configured by a reading device such as a memory stick, a memory card, or a magnetic tape, and is a device for inputting map data, music data, video data, and the like.

  The display device 8 is composed of, for example, a color liquid crystal display for displaying a map, and overlays map data (road data, character data, background data, etc.), own vehicle position mark, additional data such as a guidance route, and the like. It is configured so that it can be displayed.

  The voice controller 9 outputs facility guidance and various guidance voices from the speaker 18 based on the voice data input from the map data input device 4. The speech recognition device 10 receives an electrical signal (speech signal) based on speech uttered by the user via the microphone 19, executes processing for recognizing the user's speech based on this speech signal, and controls the speech recognition result. Output to 2. Thereby, the user can operate the car navigation device 1 by emitting a voice.

  The communication I / F 12 is connected to the in-vehicle LAN and communicates with various ECUs on the in-vehicle LAN. The control device 2 is configured to detect the start (and stop) of the engine of the vehicle via the communication I / F 12 and the in-vehicle LAN.

  The control device 2 also has a function of automatically calculating (searching) and setting an optimum route (guide route) from the current position (departure point) to the destination, that is, a route calculation function (route search function). As a method for automatically setting the optimum route, for example, the Dijkstra method or the like is used. The destination can be set by the user by operating the operation switch group 5 or the remote controller 16 or by voice through the microphone 19. Further, the control device 2 executes a function of displaying the optimum route (guidance route) to the destination on the map displayed on the display unit 6 and a map matching process for positioning the current position on the map. It has a function to do.

  Next, the operation of the car navigation device 1 configured as described above, in particular, the function of the car navigation device 1 as an anti-theft device will be described with reference to FIGS. First, the visible range of a GPS satellite that can be received by the GPS antenna of the GPS receiver 15, that is, visible, will be described with reference to FIGS.

  As shown in FIG. 4, the GPS antenna 20 of the GPS receiver 15 is often disposed at the front (front) or rear (rear) in the vehicle 21. 24 or more GPS satellites are installed in a predetermined satellite orbit, and at any point on the earth, four or more satellites are visible simultaneously by the GPS antenna 20 so that the position of the receiving point can be determined. It is configured. However, in practice, since there is an obstacle between the GPS antenna 20 and the GPS satellite, the GPS satellite that should be visible may not be visible.

  For example, as shown in FIG. 4, a GPS that can be seen by the GPS antenna 20 when the GPS antenna 20 is disposed at the front portion in the vehicle 21 and when the GPS antenna 20 is disposed at the rear portion in the vehicle 21. The number of satellites, that is, the visible region (range) of the GPS satellite is different (because the vehicle body structure is different for each vehicle, and the vehicle body part that is an obstacle is different). FIG. 5 shows an example of the visible region of the GPS satellite when the GPS antenna 20 is disposed in the front part of the vehicle 21. FIG. 6 shows an example of the visible region when the GPS antenna 20 is disposed in the rear part of the vehicle 21. 5 and 6, the upper part shows the front part of the vehicle, and the lower part shows the rear part of the vehicle.

  Here, assuming that the GPS antenna 20 is disposed in the front part of the vehicle 21, the visible region (see FIG. 5) of the GPS satellite at that time is used as a determination visible region (range) in the memory in the control device 2. If stored in (nonvolatile memory such as flash memory), if the GPS antenna 20 is disposed in the rear part of the vehicle 21 after the car navigation device 1 is stolen, the visible region of the GPS satellite at that time 6 is different from the determination visible region in the memory in the control device 2 because it becomes as shown in FIG. 6, and it can be seen that the car navigation device has been stolen. When it is found that the user has been stolen, for example, control is performed to request input of a pre-registered password for authentication or to restrict the car navigation device 1 from operating (this control will be described later). ).

  Even when the GPS antenna 20 is disposed in the front part of the vehicle 21, as shown in FIG. 7, the position of the GPS antenna 20 is the left part of the front part (near the passenger seat), The center of the front (near the passenger seat and the driver's seat) and the right front (near the driver's seat) may be different, and the visible area of the GPS satellite changes depending on the location of each. To do. For this reason, even if the location of the GPS antenna 20 after the theft is the front part of the vehicle, the visible area of the GPS satellite is different from the visible area for determination stored in the control device 2. It can be seen that the navigation device has been stolen.

  Further, even if the location of the GPS antenna 20 after the theft is accidentally the same as the location before the theft, as shown in FIGS. 8A and 8B, the parking at the home before the theft is possible. The environment of the car park (having surroundings) is different from the environment of the parking lot after theft (no surroundings). For this reason, if the visible area of the GPS satellite in the home parking lot before the theft is as shown in FIG. 9A, the visible area of the GPS satellite in the parking lot after the theft is as shown in FIG. 9B. From this, it can be seen that they were different and stolen. 9 (a) and 9 (b), the upper part shows the rear part of the vehicle and the lower part shows the front part of the vehicle.

  Next, referring to the flowchart of FIG. 3, in the state before the theft, for example, in a parking lot at home, a visible region (range, map) of a GPS satellite is created, and the created visible region is determined as a visible range for determination ( The control stored in the memory (nonvolatile memory such as a flash memory) in the control device 2 as the area) will be described.

  First, in step S10 of FIG. 3, it is determined whether or not the vehicle is parked at home, that is, whether or not the current location is at home. Here, if it is a home, it progresses to "YES" in step S10, progresses to step S20, and is visible with the GPS antenna 20 in the present location (home) based on Almanac data (satellite orbit and position data). Tracking GPS satellites.

  Subsequently, the process proceeds to step S30, where information from the GPS satellites that have been tracked is received, and information on the directions in which the GPS satellites are visible, that is, azimuth and elevation are extracted from the received information. Then, a GPS satellite visible map (a visible range of the GPS satellite, for example, see FIGS. 5 and 6) is created based on the extracted information. Further, the created GPS satellite visible map is stored in a memory (nonvolatile memory) in the control device 2 as a visible range for determination. This completes the above control.

In step S10, if the current location is not home, the process proceeds to “NO” and the control is terminated.
Next, control for determining whether or not the car navigation apparatus 1 has been stolen based on the visible map (range) of the GPS satellite will be described with reference to the flowchart of FIG. First, in step S110 of FIG. 2, a visible map (visible range for determination) of a GPS satellite created and stored in advance for each vehicle is read. Then, it progresses to step S120 and tracks the GPS satellite visible with the GPS antenna 19 in the present location based on Almanac data.

  Then, the GPS satellite that has been tracked is compared with the read GPS satellite visible map. Here, when the two are different, for example, when the GPS satellite visible map that has not been tracked (unexpected) could be tracked (in contrast, the GPS satellite visible map that was read could be tracked) If it becomes impossible to track the GPS satellite which has been used), the process proceeds to “YES” in step S140. In this case, there is a high possibility that the car navigation device 1 has been removed from the vehicle and there is a risk of theft, so the user is warned and the car navigation device 1 cannot be used. Specifically, the process proceeds to step S150, and a screen for inputting a pre-registered password for authentication is displayed on the display device 8.

  Thereafter, the process proceeds to step S160, and it is determined whether or not the password input by the user matches an authentication password registered in advance. If the passwords do not match, the process proceeds to “NO” in step S160, returns to step S150, and causes the user to re-enter the password. That is, when the passwords do not match, the password input screen is continuously displayed, and the car navigation device 1 is restricted from operating.

  On the other hand, when the passwords match in step S160 (that is, when it is determined that the user is an authorized user of the car navigation device 1), the process proceeds to “YES” in step S160, and step S170. The navigation function of the car navigation device 1 is normally started, that is, the car navigation device 1 is operated.

  Also, in step S140, the tracking GPS satellites are compared with the read GPS satellite visible map, and both (that is, the currently received GPS satellite visible map and the read GPS satellite visible map) match. Sometimes go to “NO”. In this case, there is almost no possibility that the car navigation device 1 has been removed from the vehicle, and there is no possibility of theft, so the process proceeds to step S170 and the navigation function of the car navigation device 1 is started.

  The above-described theft determination control of the car navigation device 1 is appropriately executed when the vehicle engine is started or when it is detected that the vehicle is located at a point set by the user (for example, at home). It is configured.

  In this embodiment having such a configuration, the visible range of a GPS satellite that is visible by the GPS antenna 20 of the GPS receiver 15 is stored in advance as a visible range for determination, and when the car navigation apparatus 1 is started, The visible range of a GPS satellite that is visible by the GPS antenna 20 is acquired, and the visible range is compared with the stored visible range for determination. If the two do not match, the car navigation device is not operated. It was set as the structure which restricts to. According to this configuration, since the stolen car navigation device 1 cannot be used, the car navigation device 1 can be prevented from being stolen with a new configuration that is completely different from the conventionally known configuration.

  In the above embodiment, when the visible range visible by the GPS antenna 20 and the visible range for determination do not match, the user is prompted to enter an authentication password and the authentication password is input. When configured, the car navigation device is configured to operate. As a result, when the car navigation device 1 is detached from the vehicle and attached to another vehicle (or when the visible range and the visible range for determination are inconsistent due to multipath or the like) It is possible to prevent erroneous determination that the navigation device 1 has been stolen, and the car navigation device 1 can be operated by a legitimate user.

  Further, in the above-described embodiment, when the vehicle is parked at home, the visible range of the GPS satellite that can be seen by the GPS antenna 20 is stored as the visible range for determination. The determination can be performed accurately. The point where the visible range for determination is stored is not limited to the above-described home, but may be another point designated by the user (such as a company or a store that stops frequently).

  Moreover, in the said Example, you may comprise so that the visible range of the GPS satellite visible with the GPS antenna 20 may be displayed on the display apparatus 8 as a GPS satellite visible map. With this configuration, the user can visually recognize the GPS satellite visible map, that is, specifically, by looking at the display device 8.

  Furthermore, when the GPS satellite visible map is created by the control device 2, the GPS satellite visible map is manually input (drawn) by the user, and the GPS satellite visible map is created based on the input GPS satellite visible map. You may comprise so that it may do. If comprised in this way, the processing time which produces the GPS satellite visible map by the control apparatus 2 can be shortened.

  In the above-described embodiment, the control for creating and storing the visible range for determination is configured to be executed when parking at home. However, the present invention is not limited to this, and the vehicle engine is stopped. Alternatively, the above control may be executed. In this configuration, when the vehicle engine is started, a visible range of the GPS satellite visible by the GPS antenna 19 is created, and the created GPS satellite visible range and the stored visible range for determination are stored. It is preferable that the control for determining the theft is executed.

1 is a block diagram of a car navigation apparatus showing an embodiment of the present invention. Flow chart for theft determination (part 1) Flow chart for theft determination (part 1) Side view of the vehicle showing the location of the GPS antenna Figure showing an example of a GPS satellite visible map The figure which shows the other example of the GPS satellite visible map The figure which shows the front part in the vehicle which shows the arrangement | positioning position of a GPS antenna (A) is a diagram showing the situation around the home before the theft, (b) is a diagram showing the situation around the parking lot after the theft (A) is a diagram showing an example of a GPS satellite visible map created in a parking lot at home before theft, and (b) is a diagram showing an example of a GPS satellite visible map created in a parking lot after theft.

Explanation of symbols

  In the drawings, 1 is a car navigation device, 2 is a control device (storage means, control means), 3 is a position detector, 4 is a map data input device, 5 is an operation switch group, 6 is a transceiver, 7 is an external memory, 8 is a display device, 11 is a remote control sensor, 12 is a communication I / F, 13 is a gyroscope, 14 is a distance sensor, 15 is a GPS receiver, and 20 is a GPS antenna.

Claims (4)

In a car navigation device anti-theft device for preventing a car navigation device equipped with a GPS receiver from being stolen,
Storage means that can be received by a GPS antenna of the GPS receiver, that is, a visible range of a visible GPS satellite is stored in advance as a visible range for determination;
When starting the car navigation device, obtain a visible range of a GPS satellite visible by the GPS antenna, compare the visible range with the visible range for determination stored in the storage means, An antitheft device for a car navigation device, comprising: a restricting unit that prevents the car navigation device from operating when there is a mismatch.   The restricting means causes the user to input an authentication password when the visible range and the visible range for determination do not match, and when the authentication password is input, 2. The antitheft device for a car navigation device according to claim 1, wherein the antitheft device is operated.   2. The storage means is configured to store a visible range of a GPS satellite visible by the GPS antenna as a visible range for determination when the vehicle is parked at home. Anti-theft device for car navigation devices.   The anti-theft device for a car navigation device according to claim 1, wherein a visible range of a GPS satellite visible by the GPS antenna is displayed on a display device as a GPS satellite visible map.

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