JPH0228465Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a reflection detection device that displays a received signal obtained by reflection detection using radar, sonar, etc. on a color display in PPI.

[Conventional technology]

This type of device has a configuration that displays the PPI by color-coding the received signals according to their intensity based on the signals obtained by identifying the received signals of the radar according to their intensity.
11911, etc., and Japanese Patent Application Laid-Open No. 50-40091, etc. discloses a configuration for identifying the continuity of radar reception signals and sorting and displaying detected targets.

In addition, a structure in which the signals detected in the radial direction are sequentially stored, and the signals obtained by reading out the stored contents in a direction perpendicular to the memorized direction is displayed in a spiral scanning display and displayed as PPI is disclosed in Japanese Patent Application Publication No. The radar was disclosed in Japanese Patent Application Laid-open No. 53-18894 (filed on August 6, 1975).
Disclosed by Japan).

If the same color-coding means as the above-mentioned color-coded display according to intensity is applied to the above-mentioned display based on continuity identification, the difference in the size of the detection target can be made easier to see.

A device as shown in FIG. 4 can be considered as a device provided with such a configuration.

In FIG. 4, the signal received by receiver 1 is
In radar or sonar, the signal is generally a polar coordinate signal, so it is converted to rectangular coordinates through a scan converter 2, etc., converted to 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 read out from the storage device 4, the degree of continuity is checked in the continuity identification circuit 5, the corresponding color is determined, and the record is displayed on the color display 6. indicate.

FIG. 2 shows an example of the recorded contents of the storage device.

Here, the shaded area represents a recording of "1", ie, that a received signal was received, and the white area represents a recording of "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 sequentially read out and displayed from the left end 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 with the display corresponding to point a. Read out and count the records connected to that one after another in a certain range and check how many consecutive records there are. For example, if there are 8 or more consecutive records, the color will be brown, if there are 4 to 7 consecutive records, the color will be yellow, and if there are 4 to 7 consecutive records, the color will be yellow.
The color display 6 displays the numbers below in red.

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;
Parts B and C of the ship are displayed in red, and the land and ship are clearly separated. The edge of the land near point b may turn yellow depending on the method used to identify continuity.

When displaying point a, it is ideal to check continuity in a certain area centered on point a, but
It is generally satisfactory to check the continuity of both or one of the columns and rows that include point a.

Now, if we read out the records in the storage device 4 sequentially from left to right in FIG. Gender identification can be configured 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.

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

There are an 8-bit consecutive detection circuit 53 and a 4-bit consecutive detection circuit 52 connected to the output of each digit of the shift register 51, which detect 8 consecutive bits and 4 bits consecutively, respectively, and connect a flip-flop 55 for detecting 8 bits or more and a flip-flop for detecting 4 bits or more. 54
Set. In addition, flip-flops 54, 5
5, if the flip-flop 55 is reset when the right end of the shift register 51 becomes "0", the flip-flop 55 is reset when the head reaches the right end of the shift register 51 when the signal "1" continues for 8 or more bits. When a continuous signal passes and the right end of the shift register 51 becomes "0", it is reset to "0".

Similarly, when a continuous signal of 4 bits or more is received, the flip-flop 54 becomes "1" while the signal continues.

The rightmost outputs of the flip-flops 54 and 55 and the shift register 51 are put into a color-coded circuit 56 consisting of a simple AND circuit, and when 8 bits or more are consecutive, the output is from terminal B and brown is displayed.
Consecutive bits to 7 bits are output from the Y terminal and are displayed in yellow, and 3 bits or less are output from the R terminal.
The output from the terminal is displayed in red to identify continuity.

[The problem that the idea aims to solve]

In the configuration shown in Figure 4 above, coordinate conversion processing is required, and in order to identify continuity more precisely, each stored data in the X direction and Y direction must be read out to identify continuity in both directions. must be carried out,
In addition to complicating the structure of the conversion processing storage and the identification processing after storage, a considerable amount of processing time is required, resulting in a delay in display and being impractical.

Therefore, there is a problem in that it is desired to provide a device that eliminates the above-mentioned disadvantages with a very simple configuration.

[Means to solve the problem]

The present invention stores a received signal obtained by performing reflection detection using radar or sonar in a radial direction in a storage device, and then scans and displays the signal obtained by reading it out in a direction perpendicular to the writing of this memory, and displays it in a spiral manner. , a reflection detection device that identifies the continuity of the above received signal and displays it on a color display according to the degree of continuity, the signal in the radial direction before writing the above received signal to the storage device. radial direction continuity identification means for identifying the above continuity in the distance direction based on the above, and circumferential direction continuity identifying means for identifying the above continuity in the circumferential direction based on the signal obtained by reading in the above perpendicular direction. By providing an identification means, the above problem can be solved.

〔Example〕

Hereinafter, an embodiment will be described with reference to FIG. 1.

In Figure 1, the radar reception signal is a radial signal, which is input into a recording device and read out in a direction perpendicular to the writing, that is, in the circumferential direction, and displayed on a spirally scanned display. The configuration is such that 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 discriminated.

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, the corresponding record is read out from the storage device 4, and the continuity is checked by the circumferential continuity identification circuit 540 and displayed on the color display 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, or may be different colors.

Furthermore, the color may be changed when both overlap.

Further, in some cases, 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 intensity. In this case, 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 when continuity is identified is different from the color tone for each intensity. Further, color classification based on intensity and color classification based on continuity may be switched and used.

As shown in Figure 3, the continuity identification circuit
There may be three levels of medium and short, and the number of consecutive bits may be determined as appropriate depending on the size of the object and the roughness of the screen.

Further, the color tone may be appropriately selected so that the object can be intuitively recognized.

[Effect of idea]

According to the present invention, as described above, the continuity in the distance direction is identified based on the signal in the radial direction before the received signal is written into the storage device, and the continuity in the circumferential direction is identified based on the signal read from the storage device. In other words, by identifying the continuity in the angular direction, both components of the polar coordinates are identified, so the continuity of the data after storage only needs to be identified in one direction, and the coordinate transformation process before storage is Not only is it unnecessary, but the time required for continuity identification is shortened, there is less time delay between reception and display, and detection information can be displayed more quickly. Since there is no need for a complicated processing configuration, the present invention has the advantage that the device can be provided simply and at low cost.

[Brief explanation of the drawing]

The drawings show an embodiment, and FIG. 1 is a block diagram of the present invention, FIG. 2 is a conventional memory configuration diagram, FIG. 3 is a diagram of a continuity identification circuit, and FIG. 4 is a conventional block diagram. be. 1...Receiver, 2...Scan converter, 3
... AD converter, 4 ... Memory device, 410 ... Memory circuit, 5 ... Continuity identification circuit, 51 ... Shift register, 52 ... 4-bit continuity detection circuit, 53
...8-bit continuous detection circuit, 54...Flip-flop for detecting 4 bits or more, 55...Flip-flop for detecting 8 bits or more, 56...Color-specific circuit, 53
0...Radial direction continuity identification circuit, 540...Circumferential direction continuity identification circuit, 6...Color display.

Claims (1)

[Claims for Utility Model Registration] A received signal obtained by performing reflection detection using a radar or sonar in a radial direction is stored in a storage device, and then the signal obtained by reading out the signal in a direction perpendicular to the writing in the memory is converted into a spiral shape. A reflection detection device that scans and displays the received signal, identifies the continuity of the received signal, and displays the PPI on a color display in different colors according to the degree of continuity, comprising: a) displaying the received signal in the radial direction before the writing; radial direction continuity identification means for identifying the continuity in the distance direction based on a signal in the direction; b. circumferential continuity for identifying the continuity in the circumferential direction based on a signal obtained by reading in the orthogonal direction; 1. A reflection detection device characterized by comprising gender identification means.