JP2000266552A - Navigation system utilizing gps - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve position accuracy that can be utilized by a personal navigation system and to reduce power consumption by combining a car navigation system with a personal navigation system utilizing a handy, portable GPS receiver that can be used by an outdoor field. SOLUTION: A car navigation system 1 with a GPS position measuring means, a storage means for storing map information, and a display means for displaying a current position that is obtained by the GPS position measuring means with map information that is read from the storage means is provided with a means for creating correction information for DGPS for improving position accuracy by reducing the influence of an error part included in a GPS signal in advance. Also, communication means 2 and 4 are provided between the car navigation system 1 and a personal navigation system 3 utilizing a handy, portable GPS receiver that can be used in an outdoor field.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a GPS (Glob).
The present invention relates to a car navigation system and a personal navigation system using an al Positioning System.

[0002]

2. Description of the Related Art Conventionally, a portable personal navigation system using a GPS system is currently broadcast by public FM multiplex broadcasting in order to reduce the influence of an error portion of the GPS and improve the position accuracy. Used DGPS information. For that purpose, it was necessary to provide an FM broadcast receiver for receiving the FM multiplex broadcast. Further, in a place where FM multiplex broadcasting cannot be received, improvement in position accuracy by DGPS cannot be expected. Similarly, as the DGPS information, there is a method using an AM beacon broadcasted by the Japan Coast Guard,
In places where information from beacons could not be received, improvement in location accuracy could not be expected.

A portable personal navigation system that receives GPS radio waves and performs an operation on the signal requires a battery (battery) because it is a portable type. Battery drains in a short time. Furthermore, in order to receive and use DGPS information such as FM multiplex broadcasts, power is also required to operate the equipment, so that the battery is consumed in a shorter time. In addition, in order to display map data in a personal navigation system, it is necessary to hold a map database or the like.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a car navigation system and a handy type portable that can be used in an outdoor field. By combining with a personal navigation system using a certain GPS receiver, it is possible to improve the position accuracy that can be used in the personal navigation system and to reduce power consumption.

[0005]

In order to solve the above-mentioned problems, in a navigation system using GPS according to the present invention, as shown in FIGS. 1 to 3, a GPS signal transmitted from a GPS satellite is used. G to find the current position using
A car navigation system comprising: a PS positioning unit; a storage unit that stores map information in a readable manner; and a display unit that displays a current position obtained by the GPS positioning unit together with the map information read from the storage unit. 1 is provided with a means for creating correction information for DGPS for improving the position accuracy by reducing the influence of an error portion included in the GPS signal in advance. The car navigation system 1 and a handy device that can be used in an outdoor field It is characterized by having communication means 2 and 4 between it and a personal navigation system 3 using a portable GPS receiver.

Here, as a means for creating correction information for DGPS on the side of the car navigation system 1, D is transmitted using an FM multiplex broadcast which is a public broadcast.
Preferably, a means for receiving GPS information is provided, and the DGPS information is transferred to a personal navigation system. As a communication means between the car navigation system and the personal navigation system, a radio wave of a specific low power radio may be used, or a public radio wave such as a mobile phone, a PHS, and an MCA may be used.

On the other hand, the personal navigation system has only a function of receiving a signal from a GPS satellite with respect to the GPS function, performs an arithmetic operation on the received signal, and uses the latitude / longitude / altitude / speed / date / time / satellite. The function of outputting a signal such as a situation is preferably performed on the car navigation system side. In this case, it is more preferable to transfer information such as map information prepared in a storage device of the car navigation system to the personal navigation system.

[0008]

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 1, a communication means 2 is added to the car navigation system 1 and a communication means 4 is added to the personal navigation system 3 to perform data communication between the communication means 2 and the communication means 4. It is configured with a device capable of.

As shown in FIG. 2, a car navigation system 1 includes a GPS antenna 5, a GPS receiver 6, an FM
Text multiplex receiver 7, FM antenna 8, arithmetic unit 9, display monitor 10, external storage readout unit 11, map software 12, vehicle speed sensor input unit 13, angular speed sensor 1
4. Further, the communication means 2 is configured by the specific low-power radio 15.

As shown in FIG. 3, the personal navigation system 3 includes a display monitor 18, a GPS antenna 19, a GPS receiver 20, an arithmetic unit 21, and a power supply unit 22.
Consists of The power supply unit 22 is composed of, for example, a vehicle-mounted battery. Further, the communication means 4 is configured by the same specific low-power radio 16 as the communication means 2 of the car navigation system 1.

[0011] The personal navigation system 3
Conventionally, a signal from a GPS satellite has been received, an arithmetic operation has been performed on the signal, and signals such as latitude, longitude, altitude, speed, date and time, and satellite usage have been output. However, signals from GPS satellites include SA (Selective Availability).
signal, which degrades the accuracy of the position where the calculation is performed intentionally, is added. As a means for removing the influence of this portion, there is a method of using a DGPS correction value. This correction information is provided by FM text multiplex broadcasting. To use this correction information, conventionally, it is necessary to provide an FM antenna for receiving DGPS information and an FM text multiplex broadcasting receiver on the personal navigation system 3 side. Was. However, even if an FM teletext receiver is provided, the DGPS correction information cannot be used in a location where the FM teletext radio wave cannot be received. In addition to the FM text multiplex broadcasting, DGPS correction information service using an AM beacon is also provided, but in order to use this service, it is necessary to provide an AM receiver set on the personal navigation system 3 side. Also, it cannot be used in a place where the information of the AM beacon cannot be received.

According to the present invention, the arithmetic unit 9 of the car navigation system 1 can generate DGPS correction information. The generated DGPS correction information is transmitted to the communication means 4 of the personal navigation system 3 using the communication means 2, and the DGPS correction information and the GPS antenna 19 are transmitted to the personal navigation system 3.
And using the GPS information received by the GPS receiver 20,
Signals such as latitude / longitude / altitude / speed / date / time and satellite usage are output with the error reduced by the DGPS correction information, and displayed on the display monitor 18.

When the DGPS correction information is generated by the arithmetic unit 9 of the car navigation system 1, the accuracy of the generated DGPS correction information becomes poor unless the position of the car navigation system 1 with as few errors as possible is not known. However, the car navigation system 1
In places where DGPS correction information is provided by FM teletext broadcasting, DGPS information broadcast using FM antenna 8 and FM teletext broadcasting receiver 7 is used, so GPS satellites are used alone. Since a position with higher accuracy than that in the case of
Since the correction information is also generated based thereon, an effect can be expected even if the data is used as the DGPS correction information in the personal navigation system 3.

Further, the car navigation system 1 has an F
In a place where the M character multiplex broadcasting cannot be received, the map information including the road information of the map software 12, the vehicle speed information from the vehicle speed sensor input unit 13, and the traveling direction of the vehicle by the angular velocity sensor 14 are provided in the car navigation system 1. Since the position with higher accuracy than that in the case of using the GPS alone is obtained from the integrated value and the GPS information, the generated DGPS correction information is also generated based on the position. An effect can be expected even when used as DGPS correction information.

(Embodiment 2) In the system described in Embodiment 1, the car navigation system 1 shown in FIG. 2 is located in an area where the FM text multiplex receiver 7 can receive DGPS information broadcasted by FM text multiplex broadcasting. If exists,
The arithmetic unit 9 decodes the DGPS information received by the FM antenna 8 and the FM character multiplex receiver 7 into a format that can be used by the personal navigation system 3, and transmits it to the personal navigation system 3 using the specified low-power radio 15. . Personal navigation system 3
Then, the position accuracy using DGPS can be obtained using the received data.

(Embodiment 3) In the configuration described in Embodiments 1 and 2, specific low-power radio, transceiver, or wire is used as the communication means 2 and 4. In this case, the first embodiment
It can be used even if there is no public communication means in the place where the car navigation system 1 exists in the cases 2 and 2.
Further, unlike the case where public communication means is used, the communication fee is not charged, so that the operation cost can be reduced.

(Embodiment 4) In the configuration described in Embodiments 1 and 2, as the communication means 2 and 4, a mobile phone, PHS, M
Use public communication means such as CA radio. in this case,
Since there is no need to directly connect the car navigation system 1 and the personal navigation system 3 by radio waves, the range of action of the personal navigation system 3 can be increased.

(Embodiment 5) In the systems described in Embodiments 1 and 2, the GPS antenna 19 and the GPS receiver 20 of the personal navigation system 3 use the GPS
It has a function of only receiving signals, and transmits GPS reception signals to the car navigation system 1 using the communication means 4 via the arithmetic unit 21. The arithmetic unit 9 of the car navigation system 1 that has received the GPS reception data performs an arithmetic operation on the GPS signal received by the personal navigation system 3, and calculates the latitude, longitude, altitude, speed,
Request the date and time, satellite usage status, etc. Then, the personal navigation system 3 is again used by using the communication means 2 and 4.
And displays it on the display monitor 18 of the personal navigation system 3.

When the arithmetic unit 9 of the car navigation system 1 performs an arithmetic operation on a GPS signal, DGPS information is also received and used from FM teletext broadcasting. Further, even when the DGPS information cannot be received by the FM text multiplex broadcasting, as described in the first embodiment, the DGPS information is generated and used by the arithmetic unit 9 of the car navigation system 1 and displayed on the personal navigation system 3. Can be expected to improve the accuracy of the position.

(Embodiment 6) In the system described in Embodiment 1 or 2, information of the map software 12 existing in the car navigation system 1 is transmitted to the personal navigation system 3 by using the communication means 2 and 4. . As a result, the display monitor 18 of the personal navigation system 3 can also display the current position on the map information.

[0021]

According to the first or second aspect of the present invention, a personal navigation system receives public DGPS information, such as an FM character multiplex receiver and an AM beacon receiver, required when using DGPS. Since it is not necessary to provide a personal navigation system with a device to perform the operation, the size of the device of the personal navigation system can be reduced. In addition, the life of the power supply unit can be extended. Until now, even if a personal navigation system is provided with a public DGPS receiver, it has not been useful in places where DFM-corrected radio waves of public FM teletext broadcasting cannot be received. DGPS
If the information service is available, even if the personal navigation system is not in a place where the public DGPS information service can be used, the position accuracy can be improved by DGPS reception.

According to the third aspect of the present invention, since a public network is not used for communication means, positioning using DGPS information can be performed at no cost. According to the invention of claim 4, even if the distance between the car navigation system and the personal navigation system is a certain distance, if the communication means can be secured, it is possible to perform positioning using DGPS information. .

Further, according to the fifth aspect of the present invention, it is not necessary to perform all the calculations for obtaining the position in the arithmetic unit of the personal navigation system, so that the power consumption of the personal navigation system can be reduced. On the car navigation system side, DG
Since the position is obtained in consideration of the PS correction information, an improvement in accuracy can be expected as compared with the case where the position is calculated only by the GPS using only the personal navigation system.

Further, according to the invention of claim 6, the information already provided on the side of the car navigation system, such as the information of the map software provided on the side of the car navigation system and the information broadcasted by the FM text multiplex broadcasting, is used for personal navigation. By transmitting the information to the system and displaying it, it is possible to use map information and information on shops and public facilities related to the current position without holding the information on the personal navigation system side. Can be simplified.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing a detailed configuration of the car navigation system shown in FIG. 1;

FIG. 3 is a block diagram showing a detailed configuration of the personal navigation system shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Car navigation system 2 Communication means 3 Personal navigation system 4 Communication means

Continued on the front page (72) Inventor Wakio Yamada 1048 Kadoma Kadoma, Osaka Pref.Matsushita Electric Works, Ltd. Masahito Fukuda 1048 Kadoma Kazuma, Kadoma City, Osaka Pref. Matsushita Electric Works, Ltd. Matsushita Electric Works Co., Ltd. F term (reference) 2C032 HB22 HB23 HB25 HC11 HD29 2F029 AA02 AA07 AB01 AB07 AB09 AC02 AC04 AC06 AC14 AD03 5H180 AA01 AA21 AA30 BB04 BB05 BB08 BB15 EE18 FF04 FF05 FF27 AFF05 FF27 AFF04

Claims (6)

[Claims] 1. A GPS positioning means for obtaining a current position using a GPS signal transmitted from a GPS satellite, a storage means for storing map information in a readable manner,
A display means for displaying the current position obtained by the positioning means together with the map information read from the storage means. Communication means between the car navigation system and a personal navigation system using a portable portable GPS receiver that can be used in an outdoor field. GP characterized by having a configuration having
Navigation system using S. 2. A means according to claim 1, wherein said car navigation system receives DGPS information transmitted using FM multiplex broadcasting which is a public broadcast, and transfers said DGPS information to a personal navigation system. And a navigation system using GPS. 3. The navigation system using GPS according to claim 1, wherein the communication means between the car navigation system and the personal navigation system uses radio waves of a specific low power radio. 4. The navigation system according to claim 1, wherein a public radio wave such as a mobile phone, a PHS, and an MCA is used as communication means between the car navigation system and the personal navigation system. 5. The method according to claim 1, wherein
The personal navigation system has only a function of receiving a signal from a GPS satellite with respect to a function related to GPS, performs an operation on the received signal, and outputs signals such as latitude, longitude, altitude, speed, date and time, satellite use status, and the like. The output function is performed on the car navigation system side, and is a navigation system using GPS. 6. The navigation system using GPS according to claim 5, further comprising means for transferring information such as map information prepared in a storage device of the car navigation system to the personal navigation system.