JPH0266483A - Rader display system - Google Patents

Abstract

PURPOSE:To improve the visibility of rader display by executing logarithmic distance scale display up to a previously set distance, and in the succeeding distance, executing an equal interval distance scale display. CONSTITUTION:A clock and a rader trigger are inputted to a counter 1. The counter 1 is reset up by the rader trigger and counted up by the successively inputted clock. The output of the counter 1 is applied to a ROM 2 and the contents of the ROM are read out. Distance scale sweeping data corresponding to sweeping having characteristics executing distance scale display expressing a near distance by a logarithmic scale and a far distance by an equal interval scale are previously stored in each X-axis deflection component and Y-axis deflection component as the contents of the ROM 2 and respective data are supplied to D/A converters 3, 4. The D/A converters 3, 4 D/A convert respective inputs and supply the converted results to sweeping amplifiers 5, 6. The D/A converters 3, 4 amplify respective inputs up to prescribed current level and send the amplified signals respectively to a CRT X-axis deflection coil and a CRT Y-axis deflection coil to display a required distance scale.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a radar display system, and more particularly to a radar display system that improves the distance scale display of a precision approach radar.

[Conventional technology]

The maximum display distance of conventional precision approach radar is 1 ON M
(Naut, 1 cal Mi Ie),
In order to improve the distance reading accuracy at short distances, the distance scale was displayed logarithmically. FIG. 2 is a display example of a distance scale when a 16-inch CRT is used and the maximum display distance is IONM, which is 1/2 of the actual size.

[Problem to be solved by the invention]

In the above-mentioned radar display method since fS fit, the intervals between the distance scales become narrower as the distance increases, so when the maximum display distance is increased, the distance intervals become too narrow at long distances, which is a drawback. FIG. 3 is a display example of a distance scale when a 16-inch CRT is used and the maximum display distance is 2ONM, which is 1/2 of the actual size.

The interval between the distance scales near 2ONM is approximately 1 compared to Fig. 2.
/3 width. FIG. 4 is an example of a distance scale displayed when a 23-inch CRT is used and the maximum display distance is 2ONM, and is 1. /2. 2ONM
The spacing between the nearby distance scales is wider than that in Figure 3, but it still does not reach the spacing in Figure 2.

On the other hand, in order to widen the intervals at long distances, a display method in which the distance scale is equally spaced like a normal search radar may be considered.

FIG. 5 shows an example of display on a 23-inch CRT with a maximum display distance of 20 NM and a distance scale at equal intervals, which is 1/2 of the actual size.

In this case, there is a drawback that the long-distance distance interval becomes wide, but the short-distance distance interval becomes too narrow.

SUMMARY OF THE INVENTION An object of the present invention is to provide a radar display system that uses a logarithmic distance scale for short distances and an equally spaced scale for long distances, in order to eliminate the above-mentioned drawbacks.

[Means to solve the problem]

The radar display method of the present invention is a radar display method for a precision approach radar, and is configured by having means for displaying a logarithmic distance scale up to a preset distance and displaying an equally spaced distance scale for distances beyond that. .

〔Example〕

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

FIG. 1 is a block diagram of a sweep system showing one embodiment of the present invention, which includes a counter 1, ROM 2, D/A conversion 7;
, a sweep amplifier 5.6, etc.

A clock and a radar trigger are input to counter 1. Counter 1 is reset by radar trigger,
After that, the count is increased according to the input flock.

The output of this counter 1 is added to ROM2, and the ROM
The contents of 2 are read out. The contents of ROM2 contain distance scale sweep data corresponding to the sweep characteristic of displaying a distance scale with a logarithmic scale for short distances and an equally spaced scale for long distances, which is stored in advance for each X@deflection and Y@deflection component of the radar display. are stored and supplied to D/A converters 3 and 4, respectively.

D7 and A/A converters 3 and 4 respectively D/A convert the input and supply it to sweep amplifiers 5 and 6.

The D/A converters 3 and 4 amplify the current of the input to a predetermined level and output the current to the CRTX@(i-direction coil and CRT
The YN deflection coil is sent out to display the desired distance scale.

FIG. 6 is an explanatory diagram showing an example of the distance scale display of the embodiment of FIG. 1.

FIG. 6 shows an example of display on a 23-inch CRT with a logarithmic distance scale up to 5NM1 and an equally spaced scale thereafter, which is 1/2 of the actual size. Close range is the third
The intervals between the distance scales are normal, and the intervals at long distances are greater than those shown in FIG. 2, making it possible to satisfy the conditions for long and short distances.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to realize a radar display system that enlarges and displays distance scale intervals for short distances while maintaining distance scale intervals for long distances above a certain level.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram of a distance scale display example when the maximum display distance is IONM on a 16-inch CRT, and Fig. 3 is a 16-inch CRT.
Fig. 4 is an explanatory diagram of a display example of a distance scale when the maximum display distance is 2ONM on a 23 inch CRT; The figure is an explanatory diagram of a display example of a distance scale with a maximum display distance of 2ONM and equally spaced distance scales on a 23-inch CRT, and FIG. 6 is an explanatory diagram showing an example of a distance scale display of the present invention. 1...Counter, 2...ROM, 3, 4...D/
A converter, 5.6...sweep amplifier.

Claims (1)

[Claims] A radar display system for a precision approach radar, characterized by comprising a means for displaying a logarithmic distance scale up to a preset distance and an equally spaced distance scale at distances beyond that.