Phase-coherent accumulation detection method used for uniform acceleration moving target

Abstract

The present invention discloses a phase-coherent accumulation detection method used for a uniform acceleration moving target and belongs to the radar technical field. According to the method of the invention, a PD radar is adopted to transmit linear frequency modulation signals; pulse compression is performed on received echo signals containing a target; coordinate shift transformation is performed on the echo signals which have been subjected to pulse compression, so that the migration of the target can be corrected; and fractional-order Fourier transformation is used to eliminate the Dopplermigration of the target and achieve the phase-coherent accumulation of energy. Since the amplitude and phase information of the echoes of the target is utilized to perform long-time phase-coherent accumulation, noises can be effectively suppressed, and the detection performance of the radar for a weak target can be improved; and the fractional-order Fourier transformation can be realized throughfast Fourier transformation, and therefore, the amount of computation can be greatly reduced, and the rapid detection of the radar for the weak target can be facilitated.

Description

technical field [0001] The invention belongs to the moving target detection technology in the field of radar technology, and in particular relates to a coherent accumulation detection method for uniformly accelerating moving targets. Background technique [0002] In recent years, with the development and progress of science and technology, how to quickly and effectively detect moving targets with low signal-to-noise ratio has become a challenging problem in the field of radar signal processing. Because long-distance targets and low radar cross-section targets usually have very low echo signal-to-noise ratios, we often call these two types of targets weak targets. In order to effectively detect weak targets, increasing the number of echo accumulation and prolonging the accumulation time is an effective method. However, as the accumulation time prolongs, the target will inevitably exhibit range walk and Doppler walk. Therefore, the compensation effect of distance walking and...

AI Technical Summary

Problems solved by technology

However, the calculation of the generalized Radon Fourier transform is very complicated, which affects the real-time performance of radar signal processing

Generally speaking, the existing methods are mainly realized by interpolation operation or multi-dimensional parameter search, which reduces the practicability due to the larger amount of computation and more complex implementation methods.

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