JP2001091270A - Portable navigation device with electronic azimuth meter, and method for detecting destination direction - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable GPS receiver of low power consumption capable of allowing to rapidly find out a destination direction, whenever and wherever one may be located. SOLUTION: An azimuth obtained by an electronic azimuth meter 20 is corrected with a declination angle value obtained from a declination angle data storage circuit 70, based on a present position obtained by a GPS receiver 10. Destination direction is obtained with a calculation processing device 30 and indicated on a display device 40.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable navigation device with an electronic compass capable of displaying a destination direction, and a destination direction detection method.

[0002]

2. Description of the Related Art GPS (Global Position)
(Ning System) is a global positioning system that uses a satellite developed and launched by the United States Department of Defense to determine the current position. At present, more than twenty-four GPS satellites have been launched over the earth, and radio waves can always be received from four or more artificial satellites anywhere on the earth. Each satellite has a defined orbit,
The position is to be known at any time.

A method for determining the current position is to receive radio waves from four or more artificial satellites whose positions on the earth are known, and to determine the distance from each satellite by the arrival time of the radio wave from each satellite. The intersection of the distance from each satellite is the current position and can be obtained.

FIG. 3 is a block diagram showing a conventional structure. [Structure description: FIG. 3] The GPS receiver 10 can determine the current position at the moment. The destination input device 50 is for inputting the latitude and longitude of the destination. The arithmetic processing device 30 performs an arithmetic process for obtaining the destination direction based on the current position information obtained by the GPS receiver 10 and the destination information input by the destination input device 50, and displays the calculation result on the display device 40. To send to. Display device 40
Is for displaying a destination direction based on information from the arithmetic processing unit 30.

FIG. 4 is a diagram showing a locus of movement. [Explanation of Operation: FIG. 4] The operation for obtaining the destination direction in the related art will be described with reference to FIG. The GPS receiver 10 can determine the current position at the moment, but cannot know the direction in which the GPS receiver 10 is facing.

Therefore, the current position is continuously obtained by the GPS receiver 10 while moving. For example, the trajectory of the movement is point 1 (139 ° 31′40 ″ east longitude, 35 ° 43′2north latitude)
9 ") → Point 2 (139 ° 31'50" E, 35 ° 43'29 "N) → Point 3 (139 ° 3E3)
2'00 ", north latitude 35 ° 43'29") → point 4
(139 ° 32'10 "E, 35 ° 43'2N
9 "), the latitude does not change and the east longitude increases, indicating that the vehicle is traveling east.

In the arithmetic processing unit 30 which receives a signal from the GPS receiver 10 as an input, the traveling direction and the destination point 5 obtained by the GPS receiver 10 continuously obtaining the signal.
The direction of the destination can be obtained from the latitude and longitude of.

For example, as shown in FIG.
139 ° 53'05 ”E, 35 ° 37'45” N
, The current position point 4 is 139 ° E3
Since it is 2'10 "and north latitude 35 ° 43'29", the direction is calculated to be about 18 ° clockwise from the east from the relation with the latitude and longitude. The direction of travel is east, so the direction of travel is 1 clockwise.
The direction of 8 ° can be determined as the direction of the destination.

[0009]

With the GPS receiver alone, the direction of the destination cannot be known unless the current position is continuously obtained while moving. In a navigation device with a sufficient battery, the current position may be obtained continuously. However, in a portable navigation device, the current position cannot be obtained continuously because the battery is limited. In a car or the like, the traveling direction is clear because the forward direction of the car is the traveling direction. However, when a person has a portable GPS receiver, it is necessary to perform measurement quickly in a short period of time because it is not known which direction the person is facing instantaneously.

[0010] It is an object of the present invention to provide a portable navigation device that can know the direction of a destination without continuously finding the current location.

[0011]

In order to achieve the above object, a portable navigation device with an electronic compass of the present invention is provided.
The following configuration is adopted.

A portable navigation device with an electronic azimuth meter according to the present invention is a GPS receiver for obtaining a current position, an electronic azimuth meter for obtaining an azimuth, and a control for controlling operations of the GPS receiver and the electronic azimuth meter. A signal generation circuit, a current position obtained by the GPS receiver, and an arithmetic processing for obtaining the destination direction based on the azimuth value obtained from the azimuth data storage circuit based on the current position and the azimuth obtained by the electronic compass. And a display device for displaying the calculation result of the calculation processing device.

The portable navigation device with an electronic compass of the present invention is characterized in that the display device displays the direction of the destination with respect to the upper end when the user uses the navigation device.

Further, the portable navigation device with an electronic compass of the present invention is characterized in that the traveling direction is simultaneously displayed on a display device.

Further, the portable navigation device with an electronic compass of the present invention is characterized in that information on north, south, east and west is simultaneously displayed on the display device.

Further, the destination direction detecting method of the present invention comprises the steps of: obtaining latitude and longitude information from a GPS receiver for obtaining a current position; azimuth information from an electronic compass for obtaining an azimuth;
It is characterized in that the direction of the destination is obtained based on the argument information obtained from the argument data storage circuit based on the current position.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments for implementing a portable navigation device according to the present invention will be specifically described below with reference to the drawings. FIG. 1 is a block diagram of a portable navigation device according to an embodiment of the present invention, and FIG.
It is an operation | movement figure for calculating | requiring the direction of a destination.

[Structure description: FIG. 1] The GPS receiver 10
C / sent from the PS satellite to identify the satellite
The navigation message including the A code, the orbit information of the satellite and the current time is received, and the position of the satellite and the distance from the satellite are obtained. If the distances from four or more satellites are determined at the same time, the current position is determined as the coordinates of the intersection, and the device can know the exact time from the result of calculating the current position. The electronic compass 20 can detect magnetic north by detecting the state of geomagnetism. The argument data storage circuit 70 is a place where the argument values at each latitude and longitude are stored in a database based on the argument data diagram shown in FIG. The control signal generation circuit 60 includes the GPS receiver 1
0 and a circuit for generating a control signal for operating and measuring the electronic compass 20. The arithmetic processing unit 30 includes:
Current position information obtained from the GPS receiver 10, argument value information obtained from the argument data storage circuit 70 based on the current position information, direction information obtained from the electronic compass 20, and information obtained from the destination input device 50 The arithmetic processing for obtaining the direction of the destination is performed based on the destination information. Display device 40
Displays the direction of the destination based on the calculation result of the calculation processing device 30. The destination input device 50 is for inputting the latitude and longitude of the destination. As an input method, a numerical value of latitude and longitude may be directly input, or a numerical value may be transmitted from a map software by detecting the numerical value by connecting to a device such as a personal computer. Further, the destination information may be written in advance in the program memory area in the arithmetic processing unit 30 without using the destination input device 50. In the embodiment of FIG. 1, the arithmetic processing device 30 performs a process of selecting the argument data from the argument data storage circuit 70 and the argument data with respect to the current position information obtained from the GPS receiver 10. , The current position information obtained from the GPS receiver 10 is also supplied to the declination data storage circuit 70, and the GPS receiver 1
A configuration is also conceivable in which after the argument data is selected for the current position information obtained from 0, the argument value information for the current position information is supplied to the arithmetic processing unit 30.

[Description of Operation: FIG. 2] First, the information of the destination point 5 is input to the destination input device 50 at 139 ° 5 east longitude.
3'05 "and 35 ° 37'45" north latitude. At the current position point 4, a signal is sent from the control signal generation circuit 60 to the GPS receiver 10 in order to determine the current position. The GPS receiver 10 measures a current position. G
The PS receiver 10 sets the current position point 4 to 139 ° east longitude.
32'10 "and 35 ° 43'29" north latitude. Next, a signal is sent from the control signal generation circuit 60 to the electronic compass 20. The electronic compass 20 detects terrestrial magnetism and measures the direction in which the measurer is facing. The electronic compass 20 determines that the direction in which the measurer is facing is 37 ° clockwise from magnetic north. In the arithmetic processing unit 30, 139 ° 32′10 ″ east longitude and 35 ° 43′2 north latitude determined by the GPS receiver 10
9 ”and the declination data storage circuit 70 calculates the declination value as 7 ° in the counterclockwise direction.
At -7 = 30, it is required to be oriented clockwise 30 degrees from true north. Next, to determine the direction of the destination point 5, the current position point 4 (139 ° east longitude)
32′10 ″, 35 ° 43′29 ″ N and destination point 5 (139 ° 53′05 ″ E, 35 ° 37′N
45 ″). The difference in longitude is (139 ° 5 east longitude)
3'05 ")-(139 ° 32'10" E) = 20 '
55 seconds. The distance per 1 "longitude near Japan is 2
It is 5m, which is 31.4km east when converted, and it is east because the sign is positive. The latitude difference is (35 ° N
37'45 ")-(35 ° 43'29" N) =-5 '
44 ”. The distance per 1” latitude near Japan is 3
It is 0 m, which is 10.3 km when converted. The angle is arctan (10.3Km / 31.4Km)
= 18 ° The direction is 18 ° clockwise from the east. Since the direction of the measurer is 30 ° clockwise from true north, it is 60 ° from there to east. Therefore, the direction of 78 ° clockwise from the current direction is determined to be the direction of the destination.

In the above description, the GPS receiver 10 and the electronic compass 20 are operated only once to measure and obtain the destination direction. However, in the present invention, the destination direction can be obtained even by one measurement. It does not mean that the measurement is limited to one time. In order to increase the accuracy, averaging may be performed twice or three times as long as the battery allows.

[Explanation of declination data: FIG. 6] The north obtained by a compass or an electronic compass is obtained by detecting geomagnetism, and thus is not true north but magnetic north. FIG. 6 is a declination data diagram showing the difference between magnetic north and true north. In FIG. 6, latitude and longitude are drawn on the world map, and lines of declination data are drawn thereon. The minus sign in the figure indicates that magnetic north is tilted counterclockwise (west) with respect to true north, and the plus sign indicates that it is clockwise (east). Looking at the declination data around Japan, 0-10 degrees
In the range. Therefore, magnetic north near Japan is tilted counterclockwise (west) in the range of 0 to -10 °.

[Explanation of Display: FIG. 5] A specific display of the display device 40 is shown in FIG. Looking at the display device 40, the upper end portion is used as a traveling direction at the time of use, and a destination direction corresponding to the traveling direction is displayed by a destination display mark 140, and information on east, west, north and south is simultaneously displayed at the north display mark 100, the east display mark 110, the south display mark 120, the west display mark 130 is displayed.

The traveling direction mark 150 is displayed on the display device 40.
Display at the top of In FIG. 5, the traveling direction mark 150 is shown.
Is arranged outside the display device, but the traveling direction mark 1
The position of 50 may be inside the display device or outside the display device.

The traveling direction mark 150 may be always displayed or may be displayed only when the destination is displayed.

The display sample shown in FIG. 5 shows that the traveling direction is a direction of 30 ° clockwise with respect to the north and the direction of the destination is a direction of 78 ° with respect to the traveling direction. ing.

[0026]

As is apparent from the above description, the portable navigation device with an electronic compass of the present invention displays the compass data from the compass and the difference between magnetic north and true north on the GPS receiver. The calculation based on the argument data makes it possible to quickly obtain the accurate traveling direction and destination direction instantly.

Further, since there is no need to perform continuous GPS reception, power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a portable navigation device according to an embodiment of the present invention.

FIG. 2 is an operation diagram for obtaining a direction of a destination in the embodiment of the present invention.

FIG. 3 is a block diagram showing a portable navigation device according to a conventional embodiment.

FIG. 4 is a diagram showing a locus of movement and a direction of a destination in a conventional embodiment.

FIG. 5 is a display example in the embodiment of the present invention.

FIG. 6 is a diagram illustrating values of argument data according to the embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 locus point 2 locus point 3 locus point 4 current position point 5 destination point 10 GPS receiver 20 electronic compass 30 arithmetic processing unit 40 display device 50 destination input device 60 control signal generation circuit 70 argument data storage circuit 100 north Display mark 110 East display mark 120 South display mark 130 West display mark 140 Destination display mark 150 Travel direction mark

Claims (5)

[Claims] 1. A portable navigation device with an electronic azimuth meter, comprising: a GPS receiver for obtaining a current position; an electronic azimuth meter for obtaining an azimuth; and controlling operations of the GPS receiver and the electronic azimuth meter. A control signal generation circuit, a current position obtained by the GPS receiver, and an operation for obtaining the destination direction based on the azimuth value obtained from the azimuth data storage circuit based on the current position and the azimuth obtained by the electronic compass. A portable navigation device with an electronic compass, comprising: an arithmetic processing device for performing processing; and a display device for displaying an arithmetic result of the arithmetic processing device. 2. The portable navigation device with an electronic compass, wherein the display device displays a destination direction with respect to an upper end portion when the wearer uses the display device. 3. The portable navigation device with an electronic compass as claimed in claim 2, wherein the display device also displays the traveling direction at the same time. 4. The portable navigation device with an electronic compass as claimed in claim 2, wherein information on east, west, north and south is simultaneously displayed on the display device. 5. A declination obtained from a declination data storage circuit based on a latitude and longitude information from a GPS receiver for obtaining a current position, an azimuth information from an electronic compass for obtaining an azimuth, and a current position. A destination direction detection method, wherein a destination direction is obtained based on value information.