当载机存在偏航角速度时,载机航线会偏离理想航线,对稀疏阵列下视3维合成孔径雷达(DLSLA 3D SAR)成像产生影响。该文建立了载机在飞行过程中存在偏航角速度下的DLSLA 3D SAR成像模型,通过理论推导得到了信号的多普勒调频率表达式,多普勒调频率与目标被调制后的跨航向坐标有关,而与被调制后的方位向坐标无关。进一步,完成跨航向信号处理之后,在平台的速度和偏航角速度不准的情况下,利用参数化稀疏表征方法实现了平台的速度和偏航角速度的估计,并完成了方位向稀疏场景的重构,最后提出了一种形变校正方法。仿真实验验证了该算法的有效性。
【英文摘要】
In the presence of yaw angular velocity, a body will deviate from its ideal flight path, which will affect imaging of Downward-Looking Sparse Linear Array 3 D Synthetic Aperture Radar(DLSLA 3 D SAR). In this paper, an imaging model including yaw rate is established. Furthermore, Doppler frequency modulation,which is related to cross-track coordinates and not azimuth coordinates, was theoretically calculated.Thus, a cross-track signal could be reconstructed to obtain the cross-track coordinates before azimut...
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