ABSTRACT

Symmetric triangular linear frequency-modulated continuous wave (STLFMCW) signals include an up-ramp chirp and a down-ramp chirp. These two chirps can be treated individually as successive pulses for synthetic aperture radar (SAR) imaging. Since Doppler frequency shift between the two chirp signals contains information in both the azimuth and range direction, it can be utilized for motion estimation regarding the observed scene is static. This letter presents a novel motion estimation strategy based on STLFMCW signals for unmanned aerial vehicle (UAV) SAR. First, the STLFMCW signal error model is built. Then, an effective estimation strategy based on spilt-band signal interference is developed to extract radial displacements from raw data. Finally, simulations validate the proposed strategy.

摘要

对称三角线性调频连续波 (STLFMCW) 信号包括上升斜坡线性调频脉冲和下降斜坡线性调频脉冲。这两个啁啾可以单独处理为合成孔径雷达 (SAR) 成像的连续脉冲。由于两个啁啾信号之间的多普勒频移包含方位角和距离方向的信息，因此它可用于关于观察到的场景是静态的运动估计。这封信提出了一种基于 STLFMCW 信号的用于无人驾驶飞行器 (UAV) SAR 的新型运动估计策略。首先，建立STLFMCW信号误差模型。然后，开发了一种基于分裂带信号干扰的有效估计策略，以从原始数据中提取径向位移。最后，模拟验证了所提出的策略。