High-definition Doppler reconstruction method of frequency-agile radar

Abstract

The invention discloses a target high-definition Doppler information reconstruction method of a frequency-agile radar based on a sparse reconstruction algorithm, and mainly solves the problem that a traditional signal phase-coherent accumulation method cannot be used to extract the target Doppler information from a radar in the frequency agile system. The method comprises that distance compensation is carried out on echoes by means of a distance compensation matrix and a dictionary matrix; a compensated echo signal is correlated to the dictionary matrix, optimal compensation is searched for, high-definition distance of the target is obtained, and the dimension of the signal is reduced; and high-definition Doppler information reconstruction is carried out on the compensated signal by meansof an orthogonal matching and tracking algorithm. Compared with a present method, the target characteristic is reconstructed in higher precision and stability, the calculating speed and signal processing instantaneity in the reconstruction process are improved, and the method can be used to fields including design of a real-time radar signal processing system, radar anti-interference and electronic reconnoitering and confrontation.

Description

technical field [0001] The invention belongs to the technical field of radar digital signal processing, in particular to a high-resolution Doppler reconstruction method, which can be used for radar real-time signal processing system design, radar anti-jamming, electronic reconnaissance and countermeasures. Background technique [0002] The difference from the traditional pulse Doppler radar is that the carrier frequency of the transmitted pulse of the frequency-agile radar is random and agile between adjacent pulses. This pulse-to-pulse agility mechanism can greatly improve the anti-jamming performance of the radar system. For radar reconnaissance aircraft and jammers, only after accurately obtaining the operating frequency of the detected radar can they be effectively positioned and jammed. Therefore, the frequency agility radar has the following advantages and application prospects: 1) improve the anti-jamming performance of the radar, 2) increase the detection distance of...

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Problems solved by technology

There are two defects in this method: First, there is a grid mismatch problem. This method only divides the speed-distance of interest into several intervals at equal intervals. In practical application scenarios, the speed and distance of the target are both Continuously changing, the grid mismatch will cause the amplitude of the main lobe to attenuate, and false peaks will appear, which will eventually affect the detection performance of the radar system to the target

The second is the amount of calculation. In this method, the interested target speed and distance intervals are divided into equal intervals, and all possible situations of the two-dimensional combination of distance and speed are constructed by means of permutation and combination. This will lead to the algorithm When performing reconstruction calculations, too many computing resources are wasted, which affects the real-time performance of system signal processing

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