Sparse reconstruction-based broadband radar high-speed group-target resolving method

Abstract

The invention discloses a sparse reconstruction-based broadband radar high-speed group-target resolving method, which comprises the following steps: 1, keystone transformation is carried out on broadband radar echo signals of a space high-speed group-target, keystone transformation is realized through chirp-z transformation, and a discrete spectrum SCZT (m, n) of the mth broadband radar echo signal of the space high-speed group-target in a Doppler ambiguity-existing range frequency domain is obtained; 2, a relationship between an observation data matrix XCZT and a range Doppler two-dimensional complex amplitude matrix GMN of the space high-speed group-target is deduced; 3, a relationship between the observation data matrix XCZT and a range Doppler two-dimensional complex amplitude matrix G'(M*L)N of the high-speed group-target between space and time with different Doppler ambiguity times is deduced; 4, a problem of detecting and resolving the high-speed group-target between space and time with different Doppler ambiguity times is converted into a sparse optimization problem, and the range Doppler two-dimensional complex amplitude matrix G'(M*L)N of the high-speed group-target between space and time with different Doppler ambiguity times is obtained; and a range Doppler plane of the space high-speed group-target is drawn, and coherent accumulation and resolution of the space high-speed group target can be realized.

Description

technical field [0001] The invention belongs to the technical field of radar detection, and relates to a wideband radar high-speed group target resolution method based on sparse reconstruction, which is suitable for effectively realizing the detection of high-speed group targets in space by wideband radar (the absolute bandwidth of the radar transmission signal at any time is not less than 500MHz). Coherent accumulation and resolution. Background technique [0002] In the radar of the modern coherent system, it is often necessary to carry out coherent accumulation on multiple pulse echoes, and its role is mainly reflected in the following three aspects: 1) According to the signal detection theory, the coherent accumulation of M pulse echoes , can increase the signal-to-noise ratio of the target echo signal by M times to facilitate target detection; 2) can estimate the radial velocity of the target; 3) increase the dimension of multi-target resolution. When narrow-band radar...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, propose a kind of broadband radar high-speed group target resolution method based on sparse reconstruction, can overcome two limitations that traditional keystone transformation exists: 1) can't simultaneously Targets with different Le ambiguity times achieve focusing, thus causing false alarms or false signals of strong targets covering the real signals of weak targets; 2) It implies that the Doppler ambiguity times of the same target within the radar signal bandwidth range are the same premise assumptions, so that the coherent accumulation and resolution of space high-speed group targets cannot be effectively realized

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