Frequency agility radar target information reconstruction method based on coherent accumulation

Abstract

The invention discloses a frequency agility radar target information reconstruction method based on coherent accumulation. The method comprises the following steps: establishing a target echo signal model of the frequency agile radar based on coherent accumulation, and an optimization model taking a phase error and scene sparseness as optimization targets, and solving the optimization model through phase self-focusing algorithm reconstruction and an alternating direction multiplier method so as to obtain self-adaptive phase difference and speed and distance information of a target, and achieving reconstruction of the target information. According to the method, accurate target echo phase error estimation and observation scene reconstruction can be carried out, the problem that the coherent accumulation performance of the coherent frequency agility radar is reduced due to the phase error is effectively solved, good coherent accumulation performance is provided, and accurate estimation of the distance and the speed of the target is achieved.

Description

technical field [0001] The invention relates to the technical field of coherent frequency-agile radar. Background technique [0002] Frequency agile coherent radar (FACR) combines the two advantages of frequency agile and coherent systems. On the one hand, it uses the coherent system to provide signal phase information to improve the radar’s ability to distinguish targets; Switching the operating frequency of the radar allows the radar to gain an advantage in electronic countermeasures. At present, the means of realizing coherent frequency-agile radar reception is generally through the direct digital frequency synthesis method, but because it cannot realize frequency hopping in the range of several GHz, in order to achieve large-scale frequency modulation and avoid large-band interference, the direct frequency synthesis method can be used instead , however, this method inevitably produces random initial phases between pulses, which affects the performance of coherent accumu...

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Problems solved by technology

[0004] The purpose of the present invention is to propose a new method for reconstructing target information of frequency-agile radar, which can accurately estimate the phase error of target echo and reconstruct the observation scene, and effectively solve the problem of coherent accumulation performance of coherent frequency-agile radar caused by phase error. Descent problem, provides good coherent accumulation performance, and achieves accurate estimation of target distance and velocity

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