JPS61246683A - Detection display - Google Patents

Abstract

PURPOSE:To facilitate the judgment on features of a target object detected, by arranging a continuity identification means adapted to change the color tone depending the degree of continuing a received signal and an intensity identification means adapted to change the color tone depending on the intensity of the receiving signal. CONSTITUTION:A signal received with a receiver 1 is converted to a rectangular coordinate through a scan converter 2 and memorized into a memory 4 through an A/D converter 3. On the other hand, a corresponding point and a record surrounding it are always read out of the unit 4 synchronizing the scanning of a color display to check the degree of continuation with a continuity identification circuit 5 and a corresponding color is determined to be shown on the color display 6. A intensity identification circuit 7 identifies and outputs the intensity level and a color coding display is done by the intensity identification means, by continuity identification and by parallel operation of the intensity identification means and the continuity identification means through the changeover of a switch.

Description

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

In general, PP is used in reflection detection devices such as radar or sonar.
When displaying the I screen in color, it is normal to display the signals in different colors depending on the strength of the signal, but in this case, for example, if the reflected waves from land and ships are of the same intensity, they will be displayed in the same color. It was a defect that was difficult to distinguish from this alone.

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 by operating the color display means in parallel, it is possible to easily distinguish ships, land, etc. This is what I did.

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

FIG. 2 is a block diagram showing the principle of a portion of the present invention in which the color tone is changed and displayed depending on the continuity of the received signal.

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, the records of the corresponding point and its surroundings are constantly read out from the storage device 4, the degree of continuity is checked by the continuity identification circuit 5, the corresponding color is determined, and the record is displayed on the color display 6. indicate.

FIG. 3 shows an example of the recorded contents of the storage device.

Here, the shaded area represents record 111, ie, there was a received signal, and the white area represents record 01, ie, there was no received signal. A is the record corresponding to land, B, C#-1
: Records corresponding to ships.

This is read out and displayed in order from the left end in accordance with the scanning of the display device B. For example, if a display corresponding to point a is to be displayed, the continuity identification circuit 5 records the point a in the storage device 4 and displays it. Read out the connected records in terms and count them to see how many are consecutive. For example, if there are 8 or more consecutive records, brown, if 4 to 7 consecutive records, yellow, 3
The numbers less than 1 are summed and displayed in red on the color display 6.

Such a continuity identification circuit can be constructed using a computer or the like. Therefore, when the record shown in Figure 3 is displayed on the color display 6, the land area A is displayed in brown, the ship areas B and G are displayed in red, and the land and ships can be clearly separated from each other by the land area around the 6th point. Depending on the method of identifying continuity, the edges of the line may appear yellow depending on the method used to identify continuity.

When displaying point a, it is ideal to check the continuity of the area centered on point a, but it is generally satisfactory to check the continuity of both the vertical and/or horizontal columns that include point a. can.

Now, if we read out the records in the storage device 4 sequentially from left to right in FIG. The continuity identification can be constructed relatively easily as shown in FIG.

In FIG.

It is assumed that each time a new signal is read out, the signal is shifted to the right to enter, and from the right end, it is shifted out and disappears.

There is an 8-bit continuous detection circuit 56 and a 4-bit continuous detection circuit 52, which are connected to the output of each digit of the shift register 51.
Each consecutive 8 bits and consecutive 4 bits are detected and the 8 bits or more detection flip-flop 55 and the 4 or more bits detection flip-flop 54 are set. Also, for the 7 lip 70 knob 54.55, the right end of the shift register 51 is 101
If the flip-flop 55 is reset when 8 bits or more of the signal 11@ are consecutive, it will be set to 111 when the head reaches the right end of the shift register 51, and the consecutive signals will pass through the shift register. 5
When the right end of 1 becomes 101, the busy state is reset and becomes 101. Similarly, the flip-flop 54 is busy, and when a continuous signal of 4 bits or more is received, the flip-flop 54 is 11° while the signal is continuous.
becomes.

7 Litsuge'70 Tsubu 54.55 and shift register 51
The rightmost output of is input to a color-coded circuit 56 consisting of a simple AND circuit, and 8 or more consecutive bits are output from terminal B.
Continuous 4 to 7 bits are output from the Y terminal and displayed in yellow, and 3 bits or less are output from the R terminal and displayed in red to identify continuity. It was designed to do so.

FIGS. 5 and 6 show other examples of the continuity identification circuit. The example shown in FIG. 4 is an example configured with a one-shot multivibrator, and the one-shot multivibrator 510 is trigged at the rising edge of the signal (for example, a pulse with a pulse width of 4 consecutive bits). If the signal reaches 101 during this process, the [af'7] shot multivibrator 510 will be reset and the pulse will disappear.

If the AND circuit 511 takes the logical product of the negative output of the multivibrator 510 and the input signal, the output becomes 111 when the input signal is 4 bits or more consecutively. This is 4
Consecutive bits or more are detected, but the first 4 bits) d) b
Although there is a disadvantage that it is difficult to use, the circuit configuration is considerably simpler.

The example shown in FIG. 6 is an example in which the counter 520 is an up/down counter, and it counts positively for the signal 111 and counts negatively when the signal 101 is busy. The maximum count value is, for example, up to 141, and even if more signals 111 come, it will stop at 141. Also, the minimum count value is 101, and any more signal 101
Assume that it stops at log even if it comes. When the counter 520 reaches 141, the flip-flop 521 is set t, and when it becomes "0", it is reset.In this way, if the signal 111 is continuous for 4 bits or more, the output will be 11g. If the subsequent signal 1 (11) is continuous for 4 or more bits, the output will be 101. In this case, the signal is integrated by a counter, so it is resistant to noise.

In the example shown in Fig. 2, the scan converter 2 converts the received signal from polar coordinates to rectangular coordinates and stores and displays it. However, if the display is scanned in a radial or radial direction from the center, , the scan converter 2 becomes unnecessary.

FIG. 7 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, which is stored in a storage device and read out in the direction perpendicular to the writing, that is, in the circumferential direction, and displayed on a spirally 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 read 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 4101C.

On the other hand, in synchronization with the spiral scanning of the display device B, the corresponding record is read out from the storage device 4 and the circumferential direction continuity identification circuit 540 displays the continuity on the survey color display device 6.

Further, the record in the memory circuit 410 is also read out in synchronization with the memory device 4 and displayed 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 may be a different color.

Furthermore, the color may be changed when both overlap, or one of the identification circuits may be omitted depending on the case.

The present invention operates in parallel with means for color-coding and displaying received signals according to their continuity recognition and means for color-coding and color-displaying received signals according to intensity. Continuity will be identified at a certain intensity level or above, but at an intensity below this level or below the minimum number of consecutive bits for continuity identification, color classification will be performed according to intensity.

It is preferable that the color tone used when continuity is identified is different from the color tone based on intensity, and the color separation based on intensity and the color separation based on continuity may be switched and used.

FIG. 1 shows a block diagram of the present invention, and in the figure, parts indicated by the same symbols as in FIG. 2 perform the operations described above with reference to FIG.

The intensity identification circuit 7 is a circuit that identifies and outputs the intensity level, similar to the conventional A/D conversion means used for displaying colors based on signal intensity.

When the switching circuit 8 is connected to the position ■, it is color-coded according to the intensity identification means, when it is connected to the position ■, it is color-coded according to continuity identification, and when it is connected to the position ■, it is color-coded according to the intensity identification means. Colors obtained by operating both the discriminating means and the continuity discriminating means in parallel are displayed.

As illustrated in Figures #5 and 6, the continuity identification circuit is good for distinguishing between land and ships if it is identified in one step, but
If necessary, identification may be performed in three or more stages, as illustrated in FIG. 4, and the number of consecutive bits may be determined as appropriate 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.

According to the present invention, the received signals are not continuous but strong, such as reflected signals from steel towers and buoys, etc., reflected signals from ships that are slightly more continuous, and reflected signals that are more continuous. It has the effect of being able to observe the signal, its presence, and the degree of attenuation of the reflected signal depending on the distance of the point, as well as the color separation.

[Brief explanation of the drawing]

FIG. 11 is an example of a configuration illustrating the principle of the present invention, FIG. 2 is an example of a configuration of a portion that displays by changing the color tone based on continuity recognition, FIG. 3 is an example of recorded contents of a storage device, and FIG. 4 is: FIGS. 5 and 6 show an example of the configuration of the continuity identification circuit, and FIG. 6 shows another example of the configuration of the continuity identification circuit, and FIG. 7 shows an example of the configuration when the present invention is applied to a spiral scanning display 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 continuity detection circuit, 53... 8-bit continuity Detection circuit, 54...4 bits or more detection flip 7
0, 55-8 bits or more detection flip-flop, 5
6... Color-coded circuit, 510-- One-shot multivibrator-1511 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, 7...Intensity identification circuit,
8...Switching circuit.

Claims (1)

[Scope of Claims] 1. A reflection detection device that displays a received signal in PPI on a color display, comprising a continuity identifying means that changes the color tone depending on the degree of continuity of the received signal, and an intensity that changes the color tone depending on the intensity of the received signal. What is claimed is: 1. A reflection detection device characterized in that the characteristics of a detection target are made easier to judge by comprising identification means. 2. The reflection detection device according to claim 1, further comprising a switching means for operating the continuity discriminating means and the intensity discriminating means in parallel or operating each of them separately. Reflection detection device.