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在单通道合成孔径雷达(SAR)复图像的距离Doppler域,混合积累检测可通过长时间积累提高运动目标检测性能。但当目标Doppler跨模糊数时,现有方法因目标信号分裂而导致性能严重下降。该文将距离Doppler域的Doppler频率范围扩展到地面目标最大可能Doppler范围,在扩展的Doppler频率域做距离徙动校正。运用混合积累方法实现运动目标检测。与现有方法相比,该方法可消除目标信号分裂,提高Doppler模糊运动目标的检测性能。数值试验结果证明了该方法的有效性。
In the distance Doppler domain of single channel synthetic aperture radar (SAR) complex image, hybrid accumulation detection can improve moving target detection performance through long time accumulation. However, when the target Doppler crosses the ambiguities, the existing methods cause severe performance degradation due to the splitting of the target signal. This paper extends the Doppler frequency range from the Doppler domain to the maximum possible Doppler range of the ground target and makes distance migration correction in the extended Doppler frequency domain. Application of Hybrid Accumulation Method to Realize Moving Target Detection. Compared with the existing methods, this method can eliminate the target signal splitting and improve the detection performance of Doppler fuzzy moving targets. The numerical results show the effectiveness of the method.