JPS604952B2 - Color display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color display system for radar, sonar, etc.

Generally, when displaying a radar or sonar PPI screen in color, it is common to display the signals in different colors depending on the strength of the signal. If so, they would be displayed in the same color, making it difficult to distinguish them.

The present invention focuses on the fact that the continuous length of the received signal changes depending on the size of the target object, and uses color-coded display to make it easier to distinguish ships, land, etc.

A detailed explanation will be given below according to the drawings.

FIG. 1 is a block diagram showing the principle of the present invention.

Since the signal received by the receiver 1 is generally a polar coordinate signal in radar or sonar, it is converted into a rectangular coordinate signal through a scan converter 2 or the like, converted into a digital signal by an AD converter 3, and recorded in a storage device 4. On the other hand, in synchronization with the scanning of the color display, records of the corresponding point and its surroundings are constantly retrieved from the storage device 4, the degree of continuity is checked by the continuity identification circuit 2, the corresponding color is determined, and the color is displayed. Vessel 6
Display in .

FIG. 2 shows an example of the recorded contents of the storage device. Here, the diagonally shaded area indicates that there was a recording lr, that is, there was a received signal, and the white area indicates that there was a recording 0'', that is, that there was no received signal.
A is a record corresponding to land, and B and C are records corresponding to a ship. This is read out from the left edge and displayed in accordance with the scanning of the display 6. For example, if a display corresponding to point a is to be displayed, the continuity identification circuit 5 compares the record of point a in the storage device 4. The records connected to this are sequentially presented and counted over a certain range, and the number of consecutive records is determined, for example, 8.
The color display 6 displays brown when there are 4 or more consecutive pieces, yellow when there are 4 to 7 pieces in a row, red when there are 3 or less pieces. Such a continuity identification circuit can be constructed using a computer or the like. Therefore, when the record shown in FIG. 2 is displayed on the color display 6, the land area A is brown, the ship area B,
C is displayed in red, and land and ships are clearly separated. b
The edge of land near a point may turn yellow depending on the method used to identify continuity. When displaying point a, it is ideal to check the continuity of a certain area centered on point a, but it is possible to Satisfied.

Now, suppose that the records in the storage device 4 are displayed in order from left to right in Figure 2, and when one line is completed, the next line is displayed, and from the top line to the bottom line. The continuity identification in the example direction can be constructed relatively easily as shown in FIG.

In FIG. 3, signals read from the storage device 4 are sequentially input into an 8-bit shift register 51.

The signal shifts to the right every time a new signal is read!・Assume that it enters, shifts out from the right end, and disappears. An 8-bit continuous detection circuit 53 and a 4-bit continuous detection circuit 52 connected to the output of each digit of the shift register 51
, and detects each consecutive 8 bits and consecutive 4 bits, and sets the 8 bits or more detection flip-flop 55 and the 4 bits or more detection flip-flop 54.

In addition, if the flip-flops 54 and 55 are reset when the right end of the shift register 51 becomes "0", the flip-flop 55 will reset when the right end of the shift register 51 becomes "0". It is set to 1 hour when the clock reaches 1, and is reset to "0" when a continuous signal passes and the right end of the shift register 51 becomes "no". Similarly, when a continuous signal of 4 bits or more is received, the flip-flop 54 becomes nl'' while the signal continues.Flip-flops 54, 5
5 and the rightmost output of the shift register 51 are put into a color-differentiated circuit 56 consisting of a simple AND circuit, and when 8 bits or more are consecutive, the output is from mode B and brown is displayed.
Continuous bits to 7 bits are output from the Y terminal and displayed in yellow, and 3 or less bits are output from the R terminal and displayed in red to identify continuity.

Two other examples of continuity identification circuits are shown in FIGS. 4 and 5.

The example in Fig. 4 is an example configured with a one-shot multi-vibrator, and one-shot multi-vibrator 51
The signal is triggered at the rising edge of the signal (T terminal), and outputs a pulse with a duration of, for example, 4 consecutive bits. If the signal becomes 0'' on the way, at that point the one-shot multivibrator 510 is reset and the pulse disappears. If the AND circuit 511 calculates the AND of the negative output Q of the multivibrator 510 and the input signal, then This world power becomes "1" when the input signal has 4 or more consecutive bits.

This detects 4 or more consecutive bits, but has the drawback that the first 4 bits are multiplied, but it has an extremely simple circuit configuration.
The example shown in FIG. 5 is an example in which the counter 520 is an up/down counter, and counts positively when the signal is 1'' and counts negatively when the signal is 0''.

Also, the maximum count value is, for example, up to 4'', and even if the signal ``1'' comes more than that, it stays at 4'', and,
The minimum calculated value is "0", and even if more signals "0" are received, it remains at 0". Counter 52
When 0 becomes 4'', the flip-flop 521 is set, and when 0 becomes 0'', it is reset. In this way, if the signal "r" is almost continuous for 4 bits or more, the output will be "
1", and if the subsequent signal 0" is almost continuous for 4 bits or more, the output becomes 0". In this case, the signal is integrated by a counter, so it is resistant to noise etc. In the example shown in Figure 1, the scan converter 1 2 converts the received signal from polar coordinates to rectangular coordinates and stores and displays it, but if the display is scanned radially or spirally from the center. , the scan converter-2 becomes unnecessary.

FIG. 6 shows an example in which the present invention is applied to a radar to perform the above operation, and the display device performs spiral scanning.

The radar reception signal is a radial signal, and when it is stored in a storage device and read out, it is read out in the direction perpendicular to the writing, that is, in the circumferential direction, and displayed on a spiral-scanned display. Therefore, in this example, the continuity of the signal in the radial direction before being written into the storage device and the continuity of the signal in the circumferential direction after being written from the storage device are distinguished.

That is, the signal from the receiver 1 is converted into a digital signal by the AD converter 3 and recorded in the storage device 4, and the continuity is checked by the radial direction continuity identification circuit 530 and stored in the storage circuit 410. On the other hand, in synchronization with the spiral scanning of the display 6, a corresponding record is retrieved from the storage device 4, checked for continuity by the circumferential continuity identification circuit 540, and displayed on the color display 6. Furthermore, the memory in the memory circuit 410 is also stored in the memory device 4.
and display it on the color display 6.

The color tone output from the radial continuity identification circuit 530 and the circumferential continuity identification circuit 540 may be the same color, but
Each color may be different.

Furthermore, the color may be changed when both overlap.

Also, depending on the case, one of the identification circuits can be omitted. The present invention can also be applied to a device that displays received signals in color by color-coding them according to their intensity.

In this case, continuity will be identified at a certain intensity level or above, but at intensity below this level, or below the minimum number of consecutive bits for continuity identification, color coding will be done according to intensity. Become.

It is preferable that the color tone when continuity is identified is different from the color tone for each intensity.

Further, it is also possible to switch between color classification based on intensity and color classification based on continuity. The continuity identification circuit is shown in Figures 4 and 5.
As illustrated in the figure, identification in one step is sufficient for distinguishing between land and ships, but if necessary, identification can be done in two or more steps as illustrated in Figure 3. The number of consecutive bits may be appropriately determined depending on the size of the target object, the roughness of the screen, etc.

Further, the color tone may be appropriately selected so that the contrast object can be intuitively recognized. As mentioned above, by selecting the size of the target object based on the continuity of the received signal and displaying it in different colors, you can intuitively know whether the target object is a ship or land, so the effect is extremely effective. It's large.

[Brief explanation of the drawing]

FIG. 1 shows an example of a configuration illustrating the principle of the present invention, and FIG.
An example of the recorded contents of the storage device, FIG. 3 is an example of the configuration of the continuity identification circuit which is the main part of the present invention, and FIGS. 4 and 5 are examples of other configurations of the continuity identification circuit, and FIG. The figure shows a configuration example when the present invention is applied to a radar. 1...Receiver, 2...Scan converter, 3...AD converter, 4...Storage device,
410... Memory circuit, 5... Continuity identification circuit, 51... Shift register, 52...
4-bit continuous detection circuit, 53... 8-bit continuous detection circuit, 54... 4-bit or more detection flip-flop, 55... 8-bit or more detection flip-flop, 5. 6... Color-coded circuit, 510...
...One-shot multivibrator, 511...
AND circuit, 520... Counter, 521.
... Flip-flop, 530 ... Radial direction continuity identification circuit, 540 ... Circumferential direction continuity identification circuit, 6 ... ... Color indicator, A.・
... Record corresponding to land, B, C ... Record corresponding to ship, a, b ... Recording point in the storage device. Ne, soup, 2, wood, 3, ice, 4, net, 5, offing, 6

Claims (1)

[Claims] 1. A display system for radar or sonar, etc., which is equipped with means for identifying the continuity of the received signal, and is characterized by displaying PPI on a color display by changing the color tone depending on the degree of continuity of the received signal. .