JP2766166B2 - Radar video compression system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is directed to a predetermined scanning area.
The present invention relates to a radar video compression apparatus used in a radar video transmission system for transmitting radar video output from a receiver of a radar system which is fixedly operated .

[0002]

2. Description of the Related Art As is well known, a method of transmitting radar video output from a receiver of a radar system to a display device such as a central monitoring station at a remote place by using a digital line. There is.

[0003]

However, when adopting a system in which radar video is simply digitized and put on a digital line, fine quantization is required in order not to reduce the distance resolution of the target, so that high capacity is required. Or a large number of small-capacity digital lines are bundled and time-division transmission is performed, resulting in a high maintenance cost such as a fee for using the digital lines.

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and has as its object to provide a radar video compression apparatus capable of generating video data that can be transmitted through a low-capacity digital line.

[0005]

To achieve the above object, a radar video compression apparatus according to the present invention has the following configuration. That is, the radar video compression apparatus of the present invention, predetermined
A radar system that operates fixedly for scanning coverage
Digitizing means for converting the radar video including the clutter obtained in the above into digital video data; a video memory for storing the video data; and averaging at least one scan of the video data in a time axis direction to obtain an average value. Generate and consider clutter fluctuations in the average
The target detection
Target data and the following signals to the video data output from the video memory the target detection threshold level or more signals; target determining offset data generating means and for generating and outputting a target detection threshold level as a constant measure and target clutter separating means and outputting the separated into Kurattade <br/> over data; and clutter data averaging means for outputting the compressed clutter data averaging the clutter data in the time axis direction; the said target data compression Data editing means for multiplexing clutter data and outputting transmission video data.

[0006]

Next, the operation of the radar video compression apparatus according to the present invention will be described. Generates a target detection threshold level, which is a reference value for target detection, from video data obtained by digitizing radar video, and uses that to separate video data stored in video memory into target data and clutter data, and averages clutter data. Multiplexing the compressed clutter data and the target data generated as a result to form transmission video data.

[0007] Therefore, since the data amount can be reduced, the data can be transmitted through a low-capacity digital line, and the maintenance cost such as a line usage fee can be reduced. Since the target signal in the radar video is not digitized and averaged as it is, there is an advantage that the target signal does not deteriorate.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a radar video compression apparatus according to one embodiment of the present invention. As shown in FIG. 1, the radar video compression apparatus of the present invention comprises a digitizing means 1, a video memory 2, a target determination offset data generating means 3, a target / clutter separating means 4, a clutter data averaging means 5, a data editing means. 6 is basically provided.

[0009] The digitizing means 1 converts radar video output from the receiver of the radar system into digital video data according to a clock. This video data includes, for example, a clutter (b) in addition to the target (a) as shown in FIG. 2, but is temporarily stored in the video memory 2 and becomes an input to the target determination offset data generating means 3.

The target determination offset data generating means 3 averages at least one scan of the input video data in the direction of the time axis to generate an average value ((c) in FIG. 2), and sometimes generates the average value. Time-series characteristics of the clutter that changes every moment
The target detection threshold level ((e) in FIG. 2) is generated by adding an appropriate offset value ((d) in FIG. 2) as a fluctuation range which is set in consideration of the characteristics, and is used as the target clutter. It is given to the separation means 4. Flat mentioned above
The leveling process does not necessarily require the absence of the target
However, in this embodiment, the accuracy of the averaging process is improved.
The average value of multiple predetermined times when the target is absent
It is assumed.

The target / clutter separating means 4 compares the amplitude of the video data output from the video memory 2 with the target detection threshold level ((e) in FIG. 2), and the target (a) in FIG. 2 is output to the data editing means 6 as target data a, while a signal lower than the target detection threshold level, such as the clutter (b) in FIG.
Is output to the clutter data averaging means 5.

The clutter data averaging means 5 averages the clutter data b in the time axis direction and outputs compressed clutter data c obtained by compressing the amount of clutter data to the data editing means 6.

The data editing means 6 stores the target data a
And the compressed clutter data c are multiplexed to output transmission video data d.

[0014]

As described above, in the radar video compression apparatus of the present invention, a target detection threshold level serving as a reference value for target detection is generated from video data obtained by digitizing radar video, and a video memory is used by using the target detection threshold level. The video data stored in the target is separated into target data and clutter data, and the compressed clutter data generated by averaging the clutter data and the target data are multiplexed to form transmission video data, so that the amount of transmission data can be reduced. Transmission is possible through a low-capacity digital line, which has the effect of reducing maintenance costs such as line usage fees. Since the target signal in the radar video is digitized as it is and is not averaged, there is an effect that the target signal does not deteriorate.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a radar video compression device according to an embodiment of the present invention.

FIG. 2 is an operation explanatory diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Digitization means 2 Video memory 3 Target judgment offset data generation means 4 Target / clutter separation means 5 Clutter data averaging means 6 Data editing means

Claims (1)

(57) [Claims] 1. A fixed scanning operation for a predetermined scanning area.
Digitizing means for converting radar video including clutter obtained by a radar system used into digital video data; video memory for storing the video data; and averaging at least one scan of the video data in the time axis direction. To generate an average, and click on the average .
Add the offset value that is set in consideration of the fluctuation of the
And target decision offset data generating means for generating and outputting a target detection threshold level as determined measure of target detection; video data output from the video memory below the target data of the target detection threshold level or more signals target clutter separating means and for outputting the separated and Kurattade data of the signal; and clutter data averaging means for outputting the compressed clutter data averaging the clutter data in the time axis direction; the target data and the compressed clutter data And a data editing means for multiplexing the data and outputting video data for transmission.