Radar Moving Target Detection Method Based on Short-time Sparse Fractional Fourier Transform
A fractional Fourier, moving target detection technology, used in measurement devices, radio wave measurement systems, radio wave reflection/re-radiation, etc. Change characteristics and other problems to achieve high parameter estimation accuracy, ensure energy accumulation, and improve the effect of SCR
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[0021] In order to explain the sparse time-frequency representation of the moving target echo signal involved in the present invention, a Time-Frequency Distribution (TFD) model of the time-varying non-stationary signal is first given.
[0022] After pulse compression, the radar moving target signal can be modeled as a Frequency Modulated (FM) signal with amplitude fluctuations, namely
[0023]
[0024] In the formula, a(t m ) is the envelope of the signal, t m is the slow time between pulses, is the signal phase.
[0025] In practical engineering applications, according to the length of radar observation and signal accumulation time, the maneuvering target echo signal can be approximated as a linear FM (LFM) signal to describe the target's velocity and acceleration motion state. Although high-order phase signals (such as quadratic frequency modulation signals or polynomial signals) can more accurately describe time-varying signals, the subsequent coherent accumulation ...
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