JPH0140067Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention connects the detection signal obtained by rotating the antenna pointing direction while detecting the distance direction to a black-and-white radar that displays the detection signal on a black-and-white display. The present invention relates to a color display radar addition device that displays a color display image colored according to the color display.

In a conventional black and white radar, a transmission radio wave is sent out while rotating the antenna pointing direction, a detection signal is received by the reflected signal, and a display, such as a cathode ray tube display, is displayed in synchronization with the rotation of the antenna pointing direction. By mechanically rotating the CRT display's deflection device and scanning the CRT display's electron beam in the radial direction, so-called PPI
It was displaying. In other words, the black-and-white radar had a real-time display where the received detection signal was directly sent to the CRT display.

On the other hand, while rotating the pointing direction of the antenna, the detection signal is stored in the main memory,
The signal stored in its main memory is read out in synchronization with the scanning of the color display, and the read out detection signal is converted into a different color signal corresponding to its value, that is, the instantaneous level of the detection signal, and the color It has been proposed to drive a color display using a signal to display PPI on a display screen in a color that corresponds to the reflection level. Although the resolution of such radars with color display is somewhat worse than that of black and white radars, since the reflection level is differentiated by color, reflective objects with small differences in level can be displayed conspicuously, making them easy to see. There is.

This invention provides a radar addition device for color display that can easily perform color display with a simple and inexpensive configuration by adding it to an existing monochrome radar.

An embodiment of the color display radar addition device according to this invention will be described below with reference to the drawings. In FIG. 1, numeral 11 indicates a black and white radar part, and
The transmitted pulse radio waves from 2 are radiated to the outside through a directional antenna 13, and the direction of the directional antenna 13 is rotated by a motor 14. An angle signal indicating the angle of the pointing direction of the antenna 13 from the motor 14 is generated by the angle signal generator 15, and this angle signal drives the pulse motor 17 through the drive circuit 16, for example, to drive the polarization yoke of the black and white CRT display 18. 19 is rotated. Therefore, the monochrome CRT display 18 is swept in its radial direction, and the sweep rotates in synchronization with the rotation of the pointing direction of the antenna 13, so that the radial sweep is performed sequentially.

A detection signal consisting of a reflected signal from the antenna 13 is received by a receiver 21 and is given as a display signal to a monochrome CRT display 18 through a synthesis circuit 22, so that a so-called PPI display is performed. When the rotation of the motor 14 causes the pointing direction of the antenna 13 to match the reference direction of a device equipped with this radar, for example, a ship, for example, the bow direction, the reference direction signal generator 2
A reference direction signal is obtained from 3, and this is sent to the synthesis circuit 2.
2 to the monochrome CRT display 18.
This causes the reference orientation to be displayed on the display screen. Although not shown in the figure, distance markers, direction markers, etc. are also configured to be displayed on the display screen of the display 18.

In this invention, the transmitter 1 of the monochrome radar section 11
2, a detection video signal from the receiver 21, an angle signal from the angle signal generator 15,
The reference signals from the reference direction signal generator 23 are displayed on the color display section through the interface section 24.
25 to display the signal in different colors depending on the instantaneous level of the detection signal. That is, in the interface section 24, the transmission trigger from the transmitter 12 is supplied to the buffer circuit 26, and the angle signal from the angle signal generator 15 is supplied to the buffer circuit 27.
The signal is applied to the azimuth signal converter 28 through the azimuth signal converter 28, where it is converted into an angular signal corresponding to the angular resolution of the color display 25.

In other words, in order to rotationally drive the polarization yoke 19 in the black and white radar unit 11, for example, 480 pulses are generated in 360 degrees, and one rotation of 360 degrees in the pointing direction is made 20 times per minute, that is, one rotation takes 3 seconds. rotate,
The angle signal pulse is therefore 160Hz. on the other hand,
In the color display 25, the angle signal is e.g.
The azimuth resolution is every 0.5 degrees, and one rotation of the antenna pointing direction takes 3 seconds, and during that time, each rotation of the antenna direction is 0.5 degrees.
In other words, it generates 720 pulses, resulting in a 240Hz angle signal. Therefore, in this example, the direction signal converter 28
Converts a 160Hz angle signal to a 240Hz angle signal.
In other words, if you multiply the 160Hz angle signal of the monochrome radar by 3/2, you will get a 240Hz angle signal.

Further, the detection video signal from the receiver 21 of the monochrome radar section 11 is applied to a buffer 29, and the reference azimuth signal from the reference azimuth generator 23 is applied to a buffer 31. Outputs from these interface sections 24 are supplied to a color display section 25.

In the color display section 25, the detected video signal from the buffer 29 is sampled at appropriate intervals by an AD converter 32, and each sampling value is stored in a buffer memory 33 as a multi-bit digital value. This memory is written by addressing the output of the counter 34 through the selector 39;
The transmission trigger from the buffer 26 is applied to the clock generator 35 to generate a clock pulse with a period determined by the period of the transmission trigger, that is, the period corresponding to the so-called range set by the black and white radar. This clock is counted by a counter 34. Therefore, a predetermined number of sampling signals are stored in the buffer memory 33 in synchronization with the transmission trigger.

This detection signal is transferred to main memory 36. That is, the read counter 37 counts the clocks at the terminal 38, and the contents of this counter 37 are selected by the selector 39 to designate the read address of the buffer memory 33, while the contents of this counter 37 are sent to the main memory 3 as a distance address through the selector 41.
Specify the lower address of 6. Angle signal converter 2
The angle signal converted by 8 is applied to a counter 42 for counting, and this counter 42 is reset by the reference direction from the buffer 31.
The counted value of this counter 42 is supplied to the main memory 36 as an upper address through the selector 41.

As shown in FIG. 2, the main memory 36 has memory cells M ₁₁ to M _1o that store one sampling value of the detection video signal stored in the buffer memory 33 arranged in rows and columns. The addresses are 0 degrees, 0.5 degrees, and 1.0 degrees in this example.
The addresses are set in increments of 0.5 degrees, such as 0.5 degrees, 1.5 degrees, etc., and the rows of the memory 36 are designated by the counter 42, and the addresses are increased in the order of reflected signals having the closest distance address to the angle address. Therefore, the main memory 36 is larger than the buffer memory 33.
The detection signal of 0 degree is sequentially stored in the memory cells as shown by the solid line arrow in FIG. In this way, detection signals corresponding to angle signals are sequentially stored.

This main memory 36 is repeatedly read out and displayed on the color display 43 as a display signal. that time,
The digital detection signal read out from the main memory 36 is supplied to a color converter 45 through a synthesizer 44.
The color converter 45 converts the digital value into a color signal corresponding to the digital value, and provides the color signal to the color display 43 as a display signal. On the other hand, the clock from the terminal 46 is counted by the angle counter 47, and the carry of this angle counter 47 is counted by the distance counter 48.
The count values of these counters 47 and 48 are determined by the selector 4.
1 is given as the read address of the main memory 36. In other words, the addresses in the column direction of the main memory 36 are sequentially specified by the contents of the angle counter 47, that is, the angle addresses are sequentially specified, and when the angle address for one column has been specified, a carry is carried and the distance address is set by one step. The row addresses for that column are all specified, ie, the angular addresses, and the main memory 36 is therefore read out sequentially as shown by dotted lines in FIG.

The carry signal of this angle counter 47 is
9 into a sine wave, that is, a sine wave signal whose period is one period for reading out one row of memory cells in FIG.
The analog signal obtained by converting the count value of 2 by the DA converter 51, that is, the analog signal corresponding to the address in each distance direction in the memory cell, is added by the analog synthesis adder 52. The added output is divided into two parts, one of which remains as is, and the other of which is shifted in phase by 90 degrees by a phase shifter 53 and supplied to the deflection circuit 54 of the color display 43. Therefore, the color display 43 is scanned concentrically, and as a result, the detection signal read out from the main memory 36 is displayed in PPI color. A spiral operation may be used instead of this concentric scanning. The contents of the angle counter 47 and the distance counter 48 and the reference direction signal from the buffer 31 are supplied to a marker generator 55 and then to a color converter 45 through a synthesis circuit 44, and a distance marker, a direction marker, and a direction marker are displayed on the display 43.
Furthermore, the reference direction is displayed. Furthermore, the carry of the angle signal converter 28 and the counter 34 is supplied to the read/write control unit 56, and the output of the read/write control unit 56 switches the address signals of the selectors 39, 41 and controls the reading/writing of the memories 33, 36. will be carried out.

As mentioned above, according to this invention, as a radar addition device for color display, an interface section that takes in detection signals etc. from a black and white radar, an AD converter, a buffer memory, a main memory, an address forming circuit, an address selector, and a marker generator are used. By providing a color display section, a color converter, and a color display section, color display including marker display can be easily performed with a simple and inexpensive configuration. In the above description, the polarization yoke is driven by a pulse motor in a monochrome radar, but even when driven by a synchro motor, the signal for controlling the synchronization is converted correspondingly by the converter 28 to change the angle. All you have to do is get a signal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a color display radar device according to this invention, and FIG. 2 is a diagram showing the stored contents of its main memory. 11: Black and white radar section, 12: Transmitter, 13: Directional antenna, 14: Antenna rotation motor, 1
5: Angle signal generator, 18: Black and white display, 21:
Receiver, 23: Reference direction signal generator, 24: Interface section, 25: Color display section, 26,2
7, 29, 31: buffer, 28: angle signal converter, 32: AD converter, 33: buffer memory,
36: Main memory, 34: Write address generation section,
37: Transfer address generation section, 39, 41: Selector, 42: Transfer angle address generation section, 47:
Read angle address generation section, 48: Read distance address generation section, 56: Read/write control section.

Claims (1)

[Claim for Utility Model Registration] A detection signal obtained by rotating the antenna pointing direction while detecting the distance direction is connected to a black-and-white radar that displays the detection signal on a black-and-white display, and the detection signal is colored according to its level. A color display radar addition device that displays a color display image is provided with an interface section and a color display section, and the interface section displays the angle signal indicating the antenna pointing direction from the black and white radar on the color display. an angular signal converter for converting into an angle signal corresponding to the azimuth resolution in the section, and is configured to input the detection signal, transmission trigger signal, and reference azimuth signal from the monochrome radar into the color display section, and the color display section includes an AD converter that converts the detection signal into a digital detection signal, a buffer memory that stores the digital detection signal from the AD converter, a main memory to which the digital detection signal is transferred from the buffer memory, and the transmission trigger signal. a buffer memory write address forming circuit that forms a write address for the buffer memory based on the buffer memory, a buffer memory read address forming circuit that forms a read address for the buffer memory, and a write address from the buffer memory write address forming circuit and the buffer memory. a buffer memory address selector that selects a read address from the read address forming circuit and sends it to the buffer memory; a main memory write address forming circuit that forms a write address for the main memory; and a main memory write address forming circuit that forms a read address for the main memory. a main memory read address forming circuit that selects a write address from the main memory write address forming circuit and a read address from the main memory read address forming circuit and sends the selected address to the main memory; , a marker generation unit that generates signals for displaying distance markers, direction markers, and reference direction, and a color conversion unit that converts the digital detection signal read from the main memory and the display signal from the marker generation unit into color signals. 1. A color display radar addition device comprising: a color converter; and a color display to which color signals from the color converter are supplied.