High-resolution Doppler reconstruction method for frequency-agile radar

Abstract

The invention discloses a high-resolution Doppler information reconstruction method of frequency-agile radar targets based on a sparse reconstruction algorithm, which mainly solves the problem that the traditional signal coherent accumulation method cannot complete the target Doppler information of radar echoes under the frequency-agile system. The extraction problem. The implementation plan is: by constructing a distance compensation matrix and a dictionary matrix, the echo is compensated for distance; and then the compensated echo signal is correlated with the dictionary matrix to find the best compensation, obtain the high-resolution distance of the target, and realize Dimensionality reduction processing of the signal; then reconstruct the high-resolution Doppler information of the compensated signal through the orthogonal matching pursuit algorithm. Compared with existing methods, the present invention has higher accuracy and stability for the reconstruction of target features, and improves the calculation speed of the reconstruction process and the real-time performance of signal processing, which can be used for real-time signal processing system design of radar, Radar anti-jamming, electronic reconnaissance and countermeasures.

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...

AI Technical Summary

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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