JPH11308168A - Selection call system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To selectively call a ship whose location is clear and makes it give the response of peculiar data on the ship. SOLUTION: A radar equipment 1 which can output the position of a cursor marker as latitude/longitude data and a call transmission device 3 transmitting position data as a call code constitute a call side. A response side is constituted of a call signal reception device 2 receiving/decoding a call signal and a data processor calculating the difference distance of two pieces of position data obtained from a self-position device measuring a self-position. When the calculated difference distance is not more than a prescribed value, self-identification data is transmitted from a response transmission device 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a selective calling system for identifying a ship operating in a designated sea area.

[0002]

2. Description of the Related Art Conventionally, as a selective calling method by radio, a known identification code is transmitted from a calling side, and a response side transmits information such as its own ship position when the received and decoded identification code matches the own ship identification code. Is returned as a response signal. Therefore, in order to ascertain the names and positions of the ships acting in the designated sea area in association with each other, it is necessary to call all the target ship groups. For this reason, in the case of a ship whose ship name is unknown even though its location can be ascertained by radar or the like, many calling operations are required as described above to know the ship name.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems. The present invention directly calls a ship whose position is known and calls the ship's individual name such as the ship name. The purpose is to have the data returned.

[0004]

In the selective calling system according to the present invention, the location of a ship whose name is unknown on the radar screen is coded and transmitted as a call code. Only when the decoded position data matches the position of the own ship, the ship name of the own ship is coded and returned.

[0005]

As described above, according to the selective calling device of the present invention, only the called ship whose position data included in the calling signal matches the own ship position data will respond.

[0006]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a calling apparatus using the selective calling method of the present invention. Reference numeral 1 denotes a radar device, to which a self-position measured by the GPS receiver 2 is input, and which can encode and output the latitude and longitude of a cursor marker displayed on the radar device 1.
Reference numeral 3 denotes a call transmitting device, which emits a radio wave modulated with the position data encoded by the cursor marker as a call signal.

Reference numeral 4 denotes a response signal receiving device, which displays data unique to the ship obtained by receiving and decoding a response signal from the called ship.

FIG. 2 is a diagram showing a configuration of an apparatus mounted on the called vessel. Reference numeral 5 denotes a GPS receiver, which codes and outputs the latitude / longitude of the position of the ship. Reference numeral 6 denotes a calling signal receiving device, which receives the calling signal and outputs position data included in the calling signal. Reference numeral 7 denotes a data processor which calculates a difference distance between the two position data and sends a transmission drive signal when the difference distance is equal to or less than a predetermined distance. Reference numeral 8 denotes a response transmitting device, which transmits a radio wave modulated by the output of the self-identification code generator 9 in accordance with a transmission drive signal generated by the data processor 7.

[0009]

As described above, according to the selective calling device of the present invention, for example, the name of a ship leaving the restricted sea area can be quickly known, so that a great effect can be expected for monitoring fishery operations. .

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a calling side device using a selective calling method of the present invention. FIG. 2 is a diagram showing a configuration of a device mounted on the called vessel.

[Explanation of symbols]

1; radar device 5; GPS
Receiver 2; GPS receiver 6; paging signal receiver 3; paging transmitter 7; data processor 4: response signal receiver 8; response transmitter 9; self-code generator

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[Procedure amendment]

[Submission date] July 29, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Brief description of drawings

[Correction method] Change

[Correction contents]

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a device on a calling side using a selective calling method of the present invention.

FIG. 2 is a diagram showing a configuration of a device mounted on a called vessel.

[Description of Signs] 1; radar device 5; GPS receiver 2; GPS receiver 6; paging signal receiving device 3: paging transmitting device 7; data processor 4: response signal receiving device 8; response transmitting device 9; Generator

Claims (1)

[Claims] In a selective calling method for selecting and calling vessels scattered within a radar coverage area, a calling side designates a picture of a vessel displayed on a radar screen and obtains a vessel corresponding to the picture. The responding side compares the position data obtained from the received and decoded call codes with the self-position data obtained by the self-position measuring device equipped on the ship, and the difference is determined in advance. , When the value is smaller than the value set in (1), the unique identification code of the own ship is returned as a response code.