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Space-based radar distance/speed ambiguity resolution method based on ambiguity matrix updating

A fuzzy matrix, space-based radar technology, applied in the direction of radio wave reflection/re-radiation, using re-radiation, measuring devices, etc., can solve a large number of virtual shadow points and other problems, achieve good real-time performance, fast computing speed, and good engineering The effect of applying value

Active Publication Date: 2020-06-16
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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Problems solved by technology

The defuzzification method based on Lattice matrix transforms the distance defuzzification problem into a Lattice matrix solution problem, which can meet the requirements of time efficiency and solution accuracy at the same time, but under the condition of low signal-to-noise ratio and multiple targets, a large number of ghost points will appear

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  • Space-based radar distance/speed ambiguity resolution method based on ambiguity matrix updating
  • Space-based radar distance/speed ambiguity resolution method based on ambiguity matrix updating
  • Space-based radar distance/speed ambiguity resolution method based on ambiguity matrix updating

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Embodiment 1

[0044] The usage scenario of this embodiment is: there are 4 targets in the two-dimensional observation scene of interest, and their corresponding distances and Doppler positions are shown in Table 1. Under two different PRFs, the range and Doppler position information of the target is different.

[0045] Table 1. Target range and Doppler position under two sets of PRF

[0046] Target 1 2 3 4 distance index 1 62 691 726 1527 Doppler index 1 119 1174 1741 995 distance index 2 305 1045 654 1067 Doppler index 2 3 1531 1553 1205

[0047] The effectiveness of the proposed method is verified with two different PRF combinations. The frequencies of the first group of PRFs are 25200Hz, 25300Hz, 24500Hz and 24750Hz respectively, and the second group of PRFs adds a repetition frequency of 25000Hz on the basis of the first group of PRFs. The specific defuzzification implementation steps are as follows:

[0048] Such as figure 1As s...

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Abstract

The invention discloses a space-based radar distance / speed ambiguity resolution method based on ambiguity matrix updating, which belongs to the technical field of radars. According to the method, a fuzzy matrix is adopted to replace a traditional distance-speed two-dimensional separation ambiguity resolution criterion, the problem of fractional order errors can be avoided in the modes of matrix expansion, element sorting, amplitude variance sorting and element updating, and meanwhile the problem of virtual images caused by multi-target pairing errors and noise pairing can be solved. Under multiple PRF observations, the space-based radar target detection multi-target distance-speed ambiguity resolution is realized, and the occurrence of virtual images can be inhibited. The method has the advantages of being high in operation speed, good in real-time performance and high in anti-noise capacity, can cope with the situation of multi-target or missile defense penetration, and has good engineering application value. The method is especially suitable for ultra-high-speed target detection multi-target distance-speed ambiguity resolution.

Description

technical field [0001] The invention belongs to the technical field of radar, in particular to the field of space-based radar ultra-high-speed target detection range velocity defuzzification field. Background technique [0002] Space-based radar is not restricted by national boundaries, and can greatly overcome the influence of the curvature of the earth. It has a long range of action and a wide coverage area. Therefore, it greatly improves the early warning time and enhances the depth of defense. It has gradually received great attention from the world's military powers. Due to the long range of space-based radar and the fast detection speed of the target, there is inevitably the problem of ambiguity in the distance and speed of target detection, which has a great impact on the positioning and continuous tracking of the target. [0003] The design of multiple frequency groups is currently the main method for defuzzification of target velocity and distance. For the selected...

Claims

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Application Information

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IPC IPC(8): G01S7/41G01S13/58
CPCG01S7/418G01S13/58G01S13/582
Inventor 段崇棣卜祥元王伟伟李渝
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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