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A multi-channel coherent detection method based on sliding window phase shift

A detection method and multi-channel technology, applied to radio wave measurement systems, instruments, etc., can solve the problems of increased calculation amount and unbearable calculation resources

Active Publication Date: 2018-11-13
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

The calculation amount of these methods increases sharply with the increase of the signal bandwidth and the number of channels, resulting in a calculation load that cannot be borne by the calculation resources in engineering implementation. Method [J]. Modern Radar. 2009, 31(5): 30-34.)

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  • A multi-channel coherent detection method based on sliding window phase shift
  • A multi-channel coherent detection method based on sliding window phase shift
  • A multi-channel coherent detection method based on sliding window phase shift

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Embodiment Construction

[0034] The present invention mainly adopts the method of computer simulation to verify, and all steps and conclusions are verified correctly on MATLAB-R2010b. The specific implementation steps are as follows:

[0035] Step 1. Divide the area into a spatial grid, and evenly divide the spatial surveillance area into a rectangular grid with a size of ΔLo×ΔLa, where ΔLo and ΔLa are the rectangular side lengths of the spatial grid.

[0036] Step 2. Determine the azimuth θ and distance r information of each grid corresponding to each radar site, and establish a grid position information set.

[0037] Step 3. Determine the index of the irradiated grid.

[0038] There are N integrated transceiver radars, at time t, the angular coverage of the beam emitted by radar s is The maximum operating distance is Then the angle and distance to the radar in the area satisfy the range limit set All grids of are irradiated, record the labels of these grids, and construct a grid retrieval mat...

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Abstract

The invention discloses a multi-channel coherent detection method based on sliding window phase shifting. In this method, the distance and beam azimuth mapping relationship between the radar echo signal of each channel and the spatial grid is established, and the retrieval information set of the measurement of the radar echo signal corresponding to the transmitting and receiving channels of the spatial grid is formed; then, according to the grid information- The illumination mode retrieval matrix extracts all the echo signal measurements contained in the spatial grid of each channel, and the other channels are phase-registered with the transceiver channel 1 through the method of equal-step sliding window phase shifting, and finally the registered signal is used to align the space The grid performs multi-channel coherent detection, and traverses all spatial grids to detect the monitoring plane. This method makes full use of the valuable target echo phase information in multi-beams at each post-detection point, and realizes multi-channel coherent joint detection. It solves the problem that the traditional method cannot use the phase information of the echo signal, reduces the amount of calculation, improves the signal-to-noise ratio after the echo signal is accumulated, and improves the detection performance of multi-channel detection.

Description

technical field [0001] The invention belongs to the technical field of radar target detection, in particular to the technical field of multi-site distributed network radar signal level joint target detection. Background technique [0002] With the increasingly complex electromagnetic environment and increasingly precise hard-destroy capability, it is difficult for conventional radar systems to deal with increasingly approaching space targets and stealth targets. With the development of material technology and manufacturing process, stealth targets such as cruise missiles, stealth drones, and stealth aircraft emerge in an endless stream. The small scattering cross section of the latter greatly challenges the modern air defense network system. Such targets can be detected by increasing the power of the transmitter and increasing the aperture of the antenna. However, with huge antennas and fixed positions that are difficult to move, the survivability of precision-guided weapon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 易伟李帅谌振华郭世盛周涛陈璐孔令讲崔国龙
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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