Step frequency radar target extraction algorithm based on maximum local energy sum

A technology for step-frequency radar and target extraction, which is applied in the field of signal processing and can solve problems such as unclear physical meaning, false peaks, and large amount of calculation.

Inactive Publication Date: 2019-07-05
CNGC INST NO 206 OF CHINA ARMS IND GRP
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Problems solved by technology

The disadvantage is that the amount of calculation is large, and false peaks will appear when there is a distance to walk, and the physical meaning of the addition is not clear

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  • Step frequency radar target extraction algorithm based on maximum local energy sum
  • Step frequency radar target extraction algorithm based on maximum local energy sum
  • Step frequency radar target extraction algorithm based on maximum local energy sum

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Embodiment Construction

[0059] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0060] The solution of the present invention to solve the technical problem is: first perform IFFT on the same distance unit points in different pulse repetition periods in one frame of data, take the result after IFFT as the benchmark of the coarse distance sampling point where the target is located, and convert all the coarse distance sampling points The data within is cyclically shifted, so that the same segment of fine sampling distance in each coarse distance sampling point is continuous on the real distance of the target, which is called "alignment" processing in this algorithm. In the coarse-distance sampling point where the target is located, calculate the local energy sum of each point as the starting point, select the range when the local energy sum is the largest as the extraction range, take out a part of the data in the "aligned" matrix, and process t...

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Abstract

The invention discloses a step frequency radar target extraction algorithm based on maximum local energy sum, which is used to remove a distance mismatch redundancy between a distance range represented by step frequency signals subjected to IFFT distance refining and a distance range represented by a current echo sampling value, and an oversampling redundancy. Through the algorithm, the problem insuch classical algorithms as the abandonment method and the method of selecting sampling points with larger amplitudes that sampling of a target point is very likely to fail if the '0th' sampling point is not calibrated is solved. The algorithm is characterized in that data are 'aligned' through cyclic shifting on a coarse distance sampling dimension with a coarse distance where the target existsas a benchmark; an extraction range is determined among coarse resolution distance sampling points where the maximum value exists according to the maximum local energy sum criterion; and target extraction is finally completed in an 'aligned' matrix. The algorithm has the advantages that a data extraction range is determined totally according to measured data, so that calibration on the '0th' sampling point is avoided, and it is ensured that the extraction range can cover multiple large-energy scattering points among target scattering points.

Description

technical field [0001] The invention belongs to the technical field of signal processing, and specifically relates to a new step frequency radar target extraction algorithm based on local energy and maximum. The distance mismatch redundancy between the distance ranges represented by the wave sampled values, and the oversampling redundancy. Background technique [0002] The step frequency signal is an important high-range high-resolution radar signal. It transmits a series of radar pulses with linear hopping of the carrier frequency, and then obtains the effect of high-range high-resolution synthesis through IFFT processing on the pulse echo. The stepped frequency signal is a composite broadband signal, which decomposes the broadband signal into multiple narrowband signals in the frequency domain, and obtains the composite broadband information by sending and receiving multiple narrowband signals. The pulse signals transmitted and received by the step-frequency signal are al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G06F7/02
CPCG01S7/415G06F7/02
Inventor 戴巧娜郭鹏程邱林茂张江华倪宁张楠
Owner CNGC INST NO 206 OF CHINA ARMS IND GRP
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