JPS6353479A - Radar display system - Google Patents

Abstract

PURPOSE:To perform a highly accurate monitoring by displaying a magnified expected arbitrary bearing range and displaying reduced the other bearing range. CONSTITUTION:An arbitrary display magnification ratio K(>1) and a bearing angle range theta1-theta2 desired to be magnified are inputted to a computer 7 is advance. Based on inputs thus inputted, a calculator 71 calculates a reduction ratio (k) outside the range. A calculator 72 calculates display angles corresponding to angles in a real space in accordance with (k), K and the bearing angle range theta1-theta2 to feed the display angles to a RAM 8. An operation process is executed off line. The contact of a changeover device 9 is connected to the side of a counter 1 by a calculation termination signal, a counter output is fed to the RAM 8 and the output of the RAM 8 is fed to a ROM 2 to produce sweep saw-tooth-like waves 5a and 6a. This structure enables the inside of the magnified specific range to be monitored and controlled with a high accuracy and no target outside the range is missed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a radar display system, and in particular to a radar display system with an improved angle display function. (Prior Art) FIG. FIG. 3 is a diagram illustrating a comparison between an angle in real space in a display method and an angle in a radar display.

In the conventional radar angle display method, Fig. 3 (X)
The angle θ between two arbitrary points A and B on the real space shown in K and the corresponding angle θ4 between A and B on the radar display shown in Figure 3 (Y) were displayed as equal angles.

(Problems to be Solved by the Invention) In the conventional radar display method described above, the display angle of the radar is the same as the angle in real space, so in order to monitor and control a certain direction with high precision, It wasn't necessarily suitable.

The purpose of the present invention is to expand the display angle of the radar only in the azimuth range necessary for surveillance and control, to perform high-precision surveillance and control, and to eliminate targets outside the range. The object of the present invention is to provide a radar display method that can guarantee reliable surveillance and control without any problems.

(Means for Solving the Problems) In order to solve the above-mentioned problems and achieve the above objects, the present invention provides a radar display system that displays images of real space in all directions on the same display. The present invention is characterized by comprising means for reducing the other azimuth ranges.

(Example) Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention,
Counter 1, ROM (read-only memory) 2, D/
A (digital/analog) converter 3.4, sweep generators 5, 6, arithmetic unit 7, RAM (read/write memory)
8. It is configured with a switching device 9.

The embodiment shown in FIG. 1 shows the main components related to the display angle of the azimuth range display of the radar device. Among these components, the arithmetic unit 7, RAM 8, and switch 9 are directly related to the present invention. It is a part.

The counter 1 receives an azimuth reference signal 1a and an azimuth signal 1b which are output once per rotation of a radar antenna (not shown) and fi in the air. The azimuth signal 1b has 36 directions in all directions.
This is a pulse signal that divides 0 degrees into N equal parts and is emitted at the azimuth angle position of each of the N equal parts. Is the counter 1 based on the direction reference signal 1a? ) 9 and then counts the azimuth signal 1b that is input. In the conventional azimuth signal generation system, the output of this counter 1 is stored in the ROM.
2 and the ROM contents corresponding to the counter output value are read out. The output of this ROM2 is two outputs: 5INE (sine wave) and C08INE (cosine wave). After each output is D/A converted by D/A converters 3 and 4, it is sent to sweep generators 5 and 6. In the present invention, the counter output 1 is not sent directly to the ROM 2, but is sent to the RAM 8 via a switch 9. The output of this RAM 8 is sent to the ROM 2, and sweep sawtooth waves 5a and 6a are generated in the same manner as in the prior art. The arithmetic unit 7 in the configuration of the present invention operates as follows. That is, the computing unit 71C determines in advance an arbitrary display magnification rate K (>1) and an azimuth range θ1. θ is input as data. Based on these input data, the reduction rate calculator 71 is driven to calculate the reduction rate k of the display outside the azimuth angle range θ, to θ. The angle calculator 72 adds 1 to the reduction rate k calculated by the reduction rate calculator 71 and the enlargement rate of the input data.
Azimuth angle range θ1. According to θ2, the display angle corresponding to the angle in real space, that is, the angle of enlargement and reduction to be displayed on the radar display is calculated. This calculated angle is
8 and stored.

The calculation process in the arithmetic unit 7 is performed off-line, and after the calculation is completed, a completion signal is sent to the switch 9 to switch the switching contact of the switch 9 to the counter 1 side. Therefore, when the radar is operating, the output of counter 1 is RA
M2't is sent. An output after angle conversion (calculated angle) corresponding to the output of the counter 1 is read from the RAM 2.

FIG. 2 is a diagram showing a comparison between the angle in real space (FIG. 2 (X)) and the angle on the radar display (FIG. 2 (Y)). Azimuth angle range θ, ~θ! shown in No. 2111(X)! Then, as shown in FIG. 2 (Y) Ic, the radar display angle range is expanded only by the magnification rate, and the azimuth angle range is 01 to θ,
In other azimuth angle ranges, only the reduction ratio is displayed.

The above is a method of reading the contents of ROM2 using the output of RAM8, but the use of ROM2 is stopped and RAM8
Needless to say, it is possible to directly output the 5INE and C05INE signals for CRT deflection.

Further, in the embodiment shown in FIG. 1, the angle calculation by the angle calculator 72 is performed offline, but the offline calculation is performed only for the reduction rate, and the angle calculation is performed online.
It is also possible to read the contents of the ROM 2 using this online output.

(Effects of the Invention) As explained above, according to the present invention, radar display is performed by providing means for enlarging a specific azimuth range and reducing display of other azimuth ranges. This has the effect of realizing a radar display system that guarantees reliable surveillance and control without missing any targets, even for targets outside the target range, while performing surveillance and control with high precision.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a display diagram showing the relationship between the real space and the display on the radar display in the embodiment of FIG. FIG. 3 is a display diagram showing the relationship between real space and the display on the radar display. 1...Counter, 2...ROM, 3, 4...D/
A converter, 5, 6... sweep generator, 7... arithmetic unit,
8...RAM19...Switcher, 71...Reduction rate calculator, 72...Angle calculator. Agent: Patent attorney Shinsuke Honjo? Ward 3 (X) Diagram

Claims (1)

[Claims] A radar display system that displays images of real space in all directions on the same display device, comprising means for enlarging and displaying a preset arbitrary azimuth range and reducing display of other azimuth ranges. A radar display method characterized by: