基于混合积累的SAR微弱运动目标检测

本文指出在合成孔径雷达(SAR)有限的检测时间内,运动目标的徙动轨迹可近似为一条直线.进而提出了一种基于相干-非相干混合积累的微弱运动目标检测新方法:把检测时间分成多个连续的相干处理间隔(CPI),在各CPI内部通过FFT实现同一距离单元内信号的相干积累,在各CPI间通过Hough变换实现跨越距离单元的非相干积累,从而获得大的积累增益.仿真实验证明,新方法可显著改善微弱运动目标的检测性能.

SAR Weak Moving Target Detection Based on Hybrid Integration

In the limited synthetic aperture radar(SAR) detection time,it is shown that the track of the moving target may be approximated to a linear function versus azimuth time.Furthermore,an effective method of SAR weak moving target detection is proposed based on hybrid integration in this paper.The detection time duration is divided into multiple coherent processing intervals(CPIs).Coherent integration in same range cell may be done via fast Fourier transform(FFT) within each CPI and noncoherent integration through several range cells may be done via Hough transform among all CPIs,and thus higher integration gain can be obtained.Simulation results are also given to demonstrate that the detection performance of weak moving target may be dramatically improved.