JPH03282280A - Radio wave emitting source locator - Google Patents

Abstract

PURPOSE:To locate and display the position of a radio wave emitting source on an hourly moving ship by locating the position of a radio wave emitting source from the intersecting point of an azimuth line drawn using the positional variation of a ship due to navigation as a base line. CONSTITUTION:A display apparatus 3 has a memory medium 3a having a marine chart data stored therein and said data are converted to a coordinates value by a CPU 36 to be displayed on a display device 3C. In this case, the position data from a navigation apparatus 1 is sent out as numerical value data of latitude and longitude and the azimuth data from a direction finder 2 is sent out as numerical value data of the angle from due north and these data are successively stored in a memory circuit 3e. These accumulated data are read by the CPU 3b on the basis of the reading sequence indicated by a keyboard 3f and the position data is converted to the coordinates value of a display surface and the azimuth data are converted to azimuth lines D1, D2...and these values are displayed so as to be superposed on a marine chart to calculate intersecting points X1, X2....

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a display device that displays the position of a radio wave emission source such as a radio buoy used in oceanographic surveys and fishing.

[Conventional 11 In the land azimuth 2IJ system used for radio wave monitoring, etc., the radio wave emission source is located by drawing azimuth lines from the installation positions of a plurality of azimuth establishing sensors on a display device.

Furthermore, when radio buoys released at sea for various purposes are later recovered, a method of homing is used in which the direction of the radio waves emitted by the radio buoys is captured using a direction finder.

[Problem to be solved by the invention] However, in ships that sail alone on the sea,
It was difficult to determine the distance to the radio wave source using only azimuth information because the base line in trigonometry could not be fixed. Further, when a plurality of radio buoys are used, the order of collection cannot be determined because the distance is unknown only from the azimuth information, and efficient collection cannot be performed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a display device that can display the position of a radio wave emission source on a constantly moving ship.

[Means for Solving the Problems] The present invention has been made to achieve the above objects, and
It attempts to locate the position of the radio wave emission source from the intersection of azimuth lines drawn using the change in self α) position due to navigation as the baseline.

[Operation] Since azimuth lines are drawn on the display device in relation to the movement of the own ship, the position of the radio wave emission source can be located from the intersection of the lines.

[Example] An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a system diagram of the present invention, in which (1) is a navigation device such as a Loran navigation device, which transmits the measured position information of the own ship. <2) is a direction finder.

The measured direction information of the radio wave emission source is transmitted from the own ship. (
3) is a display device, and in the 1 display device (3) that depicts the screen as shown in Figure 2, (3a) is a memory device that stores nautical chart information along with latitude and longitude lines, and these data are It is converted into coordinate values by the CPU (3b) and displayed on the 1 display (3C) as a nautical chart with vJ lines (Lat) and meridian lines (Lon).

The position information from the navigation device (1) is sent as numerical data of latitude and longitude, and the direction information from the direction finder (2) is sent out as numerical data of the angle from true north. Memory circuit (3e) via output circuit N (3d)
are stored sequentially. These accumulated data are specified on the keyboard (3f) and sent to the CPU using the fS read sequence.
(3b), the position information is converted to coordinate values on the display surface, and the direction information is the position at the time it was measured (Pl
, P2. ) is converted into a direction line (DID2...) and displayed on the 7 display (3c) superimposed on the nautical chart, so the intersection (Xl, X2...) can be found.

[Effects of the Invention] As explained above, according to the device of the present invention, it is possible to locate the position of the radio wave emission source as the intersection point of the azimuth lines on the screen displayed. If necessary, it can be collected via the shortest route, which greatly improves raking efficiency.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of an embodiment of the present invention, and FIG. 2 shows an example of a display screen. In Figure 1, is (1) a navigation device? F12) is a direction finding fi, <3) is a display device, and 9 The display device (3) is composed of the following parts. (3aH; i storage medium, (3b) is CP Ll,
<3c) The display (3d) is the data input/output circuit &J1. (
3e) is the memory times N, <3f) is the keyboard. In Figure 2, (Lat) is the latitude line, (Lon) is the longitude line (gate, P2...) is the own ship's position, (DI, D2.
・) is the intersection of the azimuth lines (Xl, X2...>lj azimuth lines. M 1 Figure

Claims (1)

[Claims] The first position information, the azimuth information of the radio wave emission source measured from that position, and the second and third position and azimuth information obtained at sequential intervals after moving are input, and the azimuth from each position is input. A radio wave emission source display device that displays lines superimposed on latitude lines and longitude lines, and locates the radio wave emission source from the intersection of the azimuth lines.