JPH0389109A - Locator system - Google Patents

Abstract

PURPOSE:To make it possible to obtain the present position accurately and readily by preparing detail maps which are classfied in detail based on longitudes and latitudes, and retrieving the detail map through a map number based on the longitude and the latitude which are computed with a receiver. CONSTITUTION:A signal containing position data from an artificial satellite is sent into a computing part 4 through an antenna 1, a high frequency circuit part 2 and a demodulating part 3. In the computing part 4, computation is performed based on the data, and the longitude and the latitude of the receiving point are computed. Then, the computed longitude and latitude are compared with the longitude and the latitude which are stored in a map control part 6 together with a map control number in a collating part 7. The detailed map of the map control number in which the computed longitude and latitude are included is detected. Then, the detected map control number and the computed longitude and latitude are displayed on a display part 5 together. Therefore, the intended detail map is obtained by retrieving the map number of an atlas based on the displayed map control number, and the present position can be determined.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention is a locator system installed in a car, particularly for identifying longitude and latitude values obtained by receiving radio waves from an artificial satellite by referring to an atlas. This relates to a simple locator system that allows one to ascertain the current location of one's own troops.

PRIOR ART A locator system of this type is the GPS (Groba
It uses a worldwide positioning system using artificial satellites called the I Positioning System, and uses a GPS receiver and a separately prepared atlas as shown in Figure 4. In FIG. 4, 1 is an antenna, 2 is a high frequency circuit section, 3 is a demodulation section, 4 is a calculation processing section, and 5 is a display section.

A data signal containing position information from an artificial satellite is received by an antenna 1 and sent to a demodulator 3 via a high frequency circuit 2.
to demodulate. The demodulated data from the satellite includes satellite time correction data, data for satellite orbit calculation, almanac data, health data, etc. These demodulated data are sent to the calculation processing section 4 through an A/D converter. The calculation processing unit 4 performs calculation processing based on the above data to calculate the longitude and latitude of the receiving point.

The calculated longitude and latitude are sent to the display unit 5 and displayed, and the driver or fellow passenger refers to this display and grasps the current position from the atlas. Other information such as time may also be displayed on the display unit 5.

Problems to be Solved by the Invention However, although the conventional locator system described above accurately displays the longitude and latitude of the current location, when checking which position on the atlas the displayed longitude and latitude occupy, In particular, land maps do not have detailed longitude and latitude information, so there is a problem in that it is difficult to accurately determine the current location when comparing with the map.

The present invention solves these conventional problems,
It is an object of the present invention to provide an excellent and simple zero-digit system that can accurately and easily grasp the current position.

Means for Solving the Problems In order to achieve the above object, the present invention prepares a detailed map in which the longitude and latitude are further divided, and uses the longitude and latitude calculated by the receiver to transmit the detailed map through the map number. It is made searchable.

Effect: Therefore, according to the present invention, since a detailed map can be searched from the longitude and latitude calculated by the receiver, it is possible to accurately and easily grasp the current position.

Embodiment FIG. 1 shows the configuration of an embodiment of the present invention. Components similar to those of the conventional example shown in FIG. 4 are given the same reference numerals. In FIG. 1, 1 is an antenna, 2 is a high frequency circuit section, 3 is a demodulation section, 4 is a calculation processing section, 5 is a display section,
6 is a map management section, and 7 is a collation section. With these, GP
An S receiver is configured.

・On the other hand, as shown in Figure 2, the atlas covers Hokkaido, Tohoku, Kanto-Koshinetsu, Tokai, Hokuriku, Kinki, Chugoku, Shikoku, Munyo,
It is organized by region such as Okinawa, and the longitude α and latitude -β are shown in minutes. For example, longitudes αn and αi+t and latitudes βn and βn' are defined as units of area surrounded by adjacent longitudes and latitudes.
Map numbers are assigned to units of areas indicated by diagonal lines surrounded by s. Then, for each map number, the longitude αn to αn+1 and the latitude βn to β
A detailed map is prepared in which n+1 is the maximum and the area between them is subdivided into seconds. This atlas also includes a map management number that corresponds to the map number of each detailed map.

The map management unit 6, which is composed of a semiconductor memory or the like of the GPS receiver, stores the map management number corresponding to each map number in the above-mentioned map book and the values of the longitude range and latitude range in the detailed map. There is. The collation unit 7 is also provided with an arithmetic circuit that collates the longitude and latitude position data from the map management unit 6 with the longitude and latitude position data from the calculation processing unit 4.

Next, the operation of the above embodiment will be explained. A signal containing position data from an artificial satellite is received by an antenna 1, and is demodulated by a demodulation unit 3 via a high frequency circuit unit 2. The demodulated data is sent to the calculation processing unit 4 through the A/D converter, and the calculation processing unit 4 performs calculation processing based on the above data to calculate the longitude and latitude of the receiving point. The calculated longitude and latitude are compared by the collation unit 7 with the longitude and latitude stored in the map management unit 6 together with the map management number, and it is determined which map management number the detailed map includes the calculated longitude and latitude. is detected, and the detected map management number is displayed on the display unit 5 along with the calculated longitude and latitude.
will be displayed. Therefore, by searching the map number of the atlas based on the displayed map management number, it is possible to arrive at the desired detailed map. The current location can be determined by specifying the longitude and latitude values displayed on this detailed map.

- In the above embodiment, the map number of the atlas and the map management number in the map management section 6 are different, but they may be the same.

Effects of the Invention As is clear from the above embodiments, the present invention makes it possible to easily search for a detailed map based on the map number displayed on the receiver, and also to search for the detailed map using the exact longitude and latitude displayed on the receiver. This has the advantage that the current position can be accurately and easily determined.

[Brief explanation of drawings]

Fig. 1 is a schematic block diagram of a locator system according to an embodiment of the present invention, Fig. 2 is a map showing an example of a regional atlas used in the locator system, and Fig. 3 is an example of a detailed map in the atlas. FIG. 4 is a schematic block diagram showing an example of a conventional locator system. DESCRIPTION OF SYMBOLS 1... Antenna, 2... High frequency circuit part, 3... Demodulation part, 4... Calculation processing part, 5... Display part, 6...
Map management department, 7... collation department.

Claims (1)

[Claims] It consists of a receiver and an atlas, and the receiver has a calculation processing unit that calculates the longitude and latitude of the current position from the data received from the artificial satellite, and a map number that corresponds to the map number on the atlas is stored. A map management unit, a verification unit that verifies which map number the calculated longitude and latitude are included in, and a display unit that displays the map number obtained by the verification and the calculated longitude and latitude. The locator system is characterized in that the atlas includes a detailed map in which a map number corresponding to the map number of the map management unit and subdivided longitudes and latitudes are written.