JPS61104275A - System for synthesis of radar video signal - Google Patents

Abstract

PURPOSE:To perform the image display or data processing of a video signal independent from the scanning of radar, by respectively once storing video signals of radars in image memories and reading these stored video signals by common scanning before synthesizing said signals. CONSTITUTION:Video signals from a plurality of radars 1-3 are respectively once stored in image memories 4-6 and these stored video signals are read by scanning the image memories 4-6 by scanning means 10, 11 while the read video signals of a plurality of the radars are synthesized by a synthesizer circuit 13. Further, a region signal generation circuit 12 for generating a region signal at every region is provided and, by the region signal, the video signal of either one of a plurality of the radars 1-3 is selected at every region or the correlation of the video signals of a plurality of the radars 1-3 is taken to synthesize the video signals. By this method, the base point of reading scanning, a scanning speed and a scanning rotary speed can be set independently of radar scanning.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a system for combining radar video signals of a system comprising a plurality of radars installed at a plurality of different locations.

[Conventional technology]

In maritime traffic control systems, etc., video signals from multiple radars installed in different locations are collected in each area for image complementation in radio wave areas, removal of false image unnecessary signals, observation of one system of radar images, data processing, etc. Although one video signal is selected, there are cases where a plurality of video signals are correlated and synthesized.

In such cases, conventionally, as shown in Japanese Patent Application Laid-open No. 58-178277 (Japanese Patent Application No. 57-60598), the video signal of one radar is temporarily stored in an image memory, and then the video signal of the other radar is stored. The stored video signals were read out in accordance with the scanning signal, and the video signals of both radars were combined.

[Problem that the invention seeks to solve]

However, in the conventional video signal synthesis method described above,
Since the scanning of the combined video signal is the same as the scanning of the other radar, the scanning base point, scanning speed, etc. of the combined video signal cannot be changed independently of the scanning signal of the other radar, making it difficult to observe images or This sometimes caused inconvenience in data processing.

[Means for solving problems]

In order to solve the above problems, the present invention provides a system consisting of a plurality of radars installed at different locations.
It comprises an image memory provided corresponding to the plurality of radars, a common scanning circuit for scanning the image memory, and a synthesis circuit for synthesizing the video signals of the radars. Stored in image memory,
The stored video signals are read out by scanning the image memory by the scanning means, and the read video signals of the plurality of radars are combined by the combining circuit.

Further, the image memory is constituted by memories corresponding to a plurality of partial coordinates on the same coordinate plane.

Furthermore, a region signal generation circuit is provided for generating a region signal for each region, and one region signal from the region signal generation circuit is used to select one of the video signals of one of the radars for each region. , the video signals of any plurality of radars are correlated and synthesized.

[Effect]

By combining video signals from multiple radars as described above, it becomes possible to set the base point, scanning speed, scanning rotation speed, etc. of the readout scan independently of the radar scanning. The scanning starting point, scanning speed, etc. of the video signal are not restricted by the scanning of the other radar, which is convenient when displaying images or processing data of the video signal of the radar.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of a radar video signal synthesis device to which a radar video signal synthesis method according to the present invention is applied. In the same figure, 1°2.3 is the radar, 4
, 5.6 is an image memory, 7°8.9 is a write address generation circuit, 10 is a readout scanning signal generation circuit, 11 is a readout address generation circuit, 12 is an area signal generation circuit, 13 is a synthesis circuit, and 14 is a timing A signal generation circuit, T1 is an output terminal for a composite video signal, T2 is an output terminal for a trigger signal,
T3 is an output terminal for an angle signal.

Radars 1, 2, and 3 are installed at different locations, and each radiates pulsed radio waves with a fixed period from a horizontally rotating antenna (not shown), and after receiving the reflected radio waves from the target with the same antenna, they are detected.・Amplify video signal al
, a2. a3, and the video signals al, a2. a3
are sent to the image memories 4, 5 and 6, respectively, and trigger signals bl, 'o2. b3 and antenna angle signals C1, c2. Write address creation circuit 7 for each c3
, 8 and 9. When radars 1, 2 and 3 are located at remote locations, the above video signals al, a2 . a3
, trigger signals bl, b2. b3 and antenna angle signals cl, c2. It is assumed that c3 is sent through a wired or wireless transmission path. Image memories 4, 5 and 6 are on the same virtual coordinate plane (X-YJ!1lli) (71Lz
- It is provided so as to include respective predetermined areas corresponding to the monitoring areas of 1, 2, and 3, and is operated by addressing on the same coordinate plane. Image memories 4, 5 and 6 receive video signals al, a2 . a3, write address signal di from write address generation circuits 7.8 and 9;
d2. d3, A2 . The video signals al, a2 . a3 is stored, and during a read operation, the stored contents corresponding to the read address signal e are read out, and the read video signals al and a2°A3 are sent to the combining circuit 13, respectively. Write address generation circuits 7, 8 and 9 receive trigger signals bl, b2, b3 and antenna angle signal C1 from radars 1, 2 and 3, respectively.
, C2, and C3, each position in the antenna directivity direction is determined by an address signal di,
d2, A3, and this address signal di, d2゜A
3 are sent to image memories 4, 5 and 6, respectively. A readout scanning signal generation circuit 10 generates a trigger signal g having a constant period and an angle signal changing at a constant speed for performing a common scan for reading out the image memories 4, 5, and 6. and the angle signal are read out by the address generation circuit 11. Area signal generation circuit 12 and output terminal T2. I am sending it to T3. The readout address generation circuit 11 receives the retrigger signal g and the angle signal from the readout scanning signal generation circuit 10, sets the base point of the readout scan on the same coordinate of the navigation, and from this base point, the 6-area signal generation in which a readout scanning line running in the angular direction is set, each point on this scanning line is converted to an address on the same coordinates, and this address signal e is sent to image memories 4, 5 and 6. The circuit 12 receives a trigger signal g and an angle signal ri from the readout scanning signal generation circuit 10,
'A region signal i is generated for determining which two radar video signals should be correlated (product correlation) on the same coordinate plane. This area signal i includes video signals al, a2 . Each video signal al, a2 . two signals for a3, and radars 1 and 2. Video signals a1 and A2 of radars 2 and 3. The correlation between A2 and 83 is made up of two area signals for correlation between radar 1 and radar 2, which are 1 in the area and 0 in other areas. These area signals i
is a signal that is synchronized with the readout scanning line and scans from the base point of the reading ratio scanning in the same angular direction as the reading scanning at the same speed. These area signals i are sent to a combining circuit 13. The combining circuit 13 receives the video signals al, a2 . a3 and the area signal generation circuit 12, and in the area where the area signal i is 1, a video signal corresponding to the area signal is created and output to the terminal T1 (each area signal is 1 at the same time). ). The timing signal generation circuit 14 generates timing signals J1* necessary for each circuit.
J2...jn is generated and sent to each circuit.

Next, the operation of the above embodiment will be explained using FIG. Second
The figure shows the positions, areas, etc. of memories 4, 5, and 6 on the same virtual coordinate plane, and shows PL, P2, . P3 is radar 1 respectively
, 2.3 installation device, P4 is the base point of readout scanning, L is readout scanning line, A1°A2. A3 is radar 1 and 2 respectively
．． 3 monitoring areas, Ml, M2. M3 each indicates a memory area of image memory 4°5.6, and now radars 1 and 2
Assuming that the video signals al, a2゜A3 output from radars 1, 2.3 and 3 are limited to those within the monitoring areas Al, A2゜A3 of each radar 1, 2.3, Video signals al, a2 of radar l, 2.3
．． It is clear from the above description that a3 is stored in the memory areas M1, M2 and M3 of the image memories 4, 5 and 6, respectively. Each video signal al of radars 1, 2 and 3.

A2. As the area to select A3, monitor area A
Within I, A2 and A3, areas that do not overlap with other monitoring areas are allocated, and radars 1 and 2 and radar 2
Assume that mutually overlapping regions Bl and B2 of the monitoring regions Al, A2 and A3 are assigned as correlation regions between and 3, respectively, and when a region signal is created based on this, the synthesis circuit 13 outputs the regions according to the above assignments. The video signals of radars 1.2 and 3 al, a2 . The correlated video signals of a3 and radars 1 and 2 and radars 2 and 3 are
It will be output according to the scanning of the readout scanning line.

In this way, the video signals al of radars 1, 2 and 3
, a2. a3 is read out by common scanning, combined and output as a video signal on the same coordinate plane.

As described above, according to the above embodiment, the video signals al, a2 . a3 are temporarily stored in the image memories 4, 5, and 6, respectively, and the stored video signals are read out by a common scan and then synthesized in the 1 synthesis circuit 13. Therefore, the base point P4 of the readout scan, the scanning speed, and the scanning Video signals al, a2 . It is now possible to set the optimum value for image display or data processing of A3, and unlike the conventional example, the scanning starting point, scanning speed, etc. of the combined video signal are regulated by the other radar scanning. This is useful for image display or data processing.

In the above embodiment, the readout scanning method is polar coordinate (R-Q) scanning, but it is not limited to this, and it is of course possible to use rectangular coordinate (x-y) scanning, for example. be.

〔Effect of the invention〕

As explained above, according to the present invention, each radar video signal is temporarily stored in an image memory, and the stored video signals are read out by a common scan and then synthesized, so that the readout scan can be done quickly. , scanning speed, scanning rotation speed, etc. for image display or data processing of video signals independent of radar scanning.

This makes it possible to set the optimal value, which is extremely convenient for image display or data processing, and it is an excellent advantage when the radar video signal synthesis method according to the present invention is applied to, for example, a harbor radar system. Effects can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a radar video signal synthesis device to which the radar video signal synthesis method according to the present invention is applied, and FIG. 2 is a diagram for explaining the operation of the radar video signal synthesis device. It is. In the figure, 1, 2.3... Radar, 4, 5.6... Image memory, 7, 8.9... Write address creation circuit, 1
0... Read scanning signal generation circuit, 11... Read address generation circuit, 12... Area signal generation circuit, 13.
... Synthesis circuit, 14... Timing signal generation circuit.

Claims (4)

[Claims] (1) In a system consisting of a plurality of radars installed at different locations, an image memory provided corresponding to the plurality of radars, a common scanning means for scanning the image memory, and a video of the radar comprising a combining means for combining signals, temporarily storing video signals from the plurality of radars in the image memory, reading out the stored video signals by scanning the image memory with the scanning means, and reading out the stored video signals by scanning the image memory with the scanning means; A method for combining radar video signals, characterized in that video signals from a plurality of radars are combined by the combining means. (2) The radar system according to claim (1), wherein the image memory is constituted by memories provided corresponding to a plurality of partial coordinates on the same coordinate plane.
Video signal synthesis method. (3) In a system consisting of a plurality of radars installed at different locations, an image memory provided corresponding to the plurality of radars, a common scanning means for scanning the image memory, and a video of the radar. It comprises a synthesis means for synthesizing signals and an area signal generation means, the video signals from the plurality of radars are temporarily stored in the image memory, and the image memory is scanned with the stored video signals by the scanning means. The video signals of the plurality of radars read out are selected for each region by the signal from the region signal generating means, or the video signals of the plurality of radars are correlated. A method for synthesizing radar video signals, characterized in that the signals are taken and synthesized by the synthesizing means. (4) Radar video signal synthesis according to claim (1), (2), or (3), wherein the scanning from the common scanning means is polar coordinate scanning. method.