Radar high maneuvering target phase-coherent accumulation detection method based on time-reversed non-uniform sampling

Abstract

The invention relates to a radar high maneuvering target phase-coherent accumulation detection method based on time-reversed non-uniform sampling, and belongs to the technical field of radar signal processing and detecting. The radar high maneuvering target phase-coherent accumulation detection method comprises the steps that first, radar echo pulse pressure is performed, time reversal is matchedwith Fourier transform, and slow time second-order phase compensation is performed; fast time dimension Fourier transform is performed to obtain distance frequency-slow time data, and frequency second-order phase compensation is performed; then, non-uniform sampling order reduction and variable scale scaling change are performed; inverse Fourier transform and the Fourier transform are performed inthe distance frequency and time dimension separately to realize long-term phase-coherent accumulation; and finally, the detection statistics are constructed to detect and estimate a maneuvering target. The radar high maneuvering target phase-coherent accumulation detection method can effectively accumulate maneuvering target signals with a high-order phase, compensate the distance and Doppler migration and improve the detection capability of the radar maneuvering target; meanwhile, the influence of a cross term of a traditional successive order reduction method is reduced, and the parameter estimation accuracy is improved; and no multi-dimensional motion parameter search matching calculation is needed, the amount of calculation is reduced, and the radar high maneuvering target phase-coherent accumulation detection method is suitable for engineering application.

Description

technical field [0001] The invention belongs to the technical field of radar signal processing and detection. More specifically, the invention relates to a radar high maneuvering target coherent accumulation detection method based on time-reversal non-uniform sampling, which can be used for rapid radar detection and estimation of maneuvering targets. Background technique [0002] The detection and parameter estimation of maneuvering targets are always the key technologies and difficulties in radar signal processing. Since the echoes of maneuvering targets can be represented by polynomial phase signals, the stronger the maneuverability, the higher the polynomial order, and the high precision of its detection and parameters It is estimated to be more difficult. In addition, radar maneuvering target detection usually adopts coherent accumulation. Long-term coherent accumulation is an effective way to achieve high accumulation gain, but there are two problems in long-term accumu...

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Problems solved by technology

[0003] 1) The segmented or step-by-step accumulation method has limited accumulation gain and cannot cope with strong clutter backgrounds and complex motion forms of maneuvering targets. The effect of subsequent Doppler walking compensation is affected by the result of distance walking compensation, which is likely to cause target Doppler energy Diffusion, motion parameter estimation accuracy is poor

[0004] 2) The long-term coherent accumulation method based on parameter search requires multi-dimensional parameter search, but for the high-order polynomial phase signal of high-maneuvering targets, its motion parameter dimension is very high, resulting in a large amount of multi-dimensional parameter search calculations, which is difficult to be suitable for engineering applications

[0005] 3) The maneuvering target accumulation detection method based on order reduction mostly adopts correlation successive order reduction, each time order reduction will generate cross terms, thus affecting the accumulation effect and parameter estimation accuracy

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