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Anti-interference technology of secondary radar response treatment

A secondary radar, consistent technology, applied in the direction of reflection/re-radiation of radio waves, use of re-radiation, measurement devices, etc., can solve the problems of difficult to transplant secondary radar, prone to misjudgment, and low detection probability.

Inactive Publication Date: 2007-08-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0008] (1). When the number of response overlaps exceeds 2, only two aircraft can be processed at the same time at most, that is to say, the detection probability is low in the case of high-density response;
[0009] (2). In the case of many phantoms and severe FRUIT interference, the detection probability is low and misjudgment is prone to occur
From the above analysis, it can be seen that there are great flaws in judging the sorties and coding content of responding aircraft based only on the sliding window method, especially it is not suitable for high-density response processing
Moreover, only processing based on the sliding window method is not sufficient when using the information provided by the new monopulse secondary radar, and it is not easy to transplant to the S-mode secondary radar

Method used

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  • Anti-interference technology of secondary radar response treatment

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Embodiment Construction

[0074] Provide an example of implementing the present invention below, in the example, without loss of generality, we assume that the system clock frequency is 16.552MHz, the number of frames sent from the previous stage is no more than 120, and the number of times of the response reserved in the DEFRUIT program is 5 .

[0075] The whole anti-interference processing process is realized by DSP programming:

[0076] First, the data sent to the DSP after the pre-processing is stored in the DSP chip memory according to the format of Table 1.

[0077] The de-ghosting processing module is implemented by DSP programming. The flow chart is shown in Figure 2, and the amplitude consistency threshold is selected according to the actual operating environment of the processor.

[0078]The EFRUIT processing module of DSP is also implemented by DSP programming. The flow chart is shown in Figure 3. The decision threshold is reduced by 10% based on the traditional sliding window method, so th...

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Abstract

The present invention provides an interference-proofing new technique for secondary radar response treatment. Said new technique includes two portion contents: first portion content is to remove unreal image, defining unreal image frame and deleting it; and second portion content is to remove FRUIT interference. Said invention also provides the method and steps for removing said interference.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing, in particular to the response signal processing technology of monopulse secondary radar. Background technique [0002] The traditional secondary radar processing method for the response signal is mainly based on the sliding window method. Firstly, the frame is detected by detecting whether there are pulse pairs at the position with an interval of 20.2 ~ 20.4us, and then the phantom processing is performed. The processing method is shown in Figure 1, and all the intermediate frames in a series of overlapping frames are considered to be phantoms. And throw away, only keep the first and last frame. Then be the extraction of code, the method is to think that its code is 1 if there is a pulse on the corresponding position of the code in the reserved real frame, and the code is 0 if there is no pulse. Finally, it is sent to a distance-based sliding window for DEFRUIT processing. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/36G01S13/74
Inventor 李玉柏蒋睿伍春杨晓飞
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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