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根据线性调频信号的特点和光外差探测的原理,推导了具有高阶相位误差时线性调频信号经合成孔径激光雷达外差探测后的输出信号表达式。结合参考通道的系统结构和基于锐化函数的相位补偿算法,通过模拟仿真,对比分析了参考通道类型对单点目标成像的影响。通过研究锐化函数的物理含义,对锐化函数相位补偿算法进行了误差分析。指出了锐化函数相位补偿算法的适用范围,以及实现高质量的合成孔径激光雷达探测成像需进一步考虑的问题。
According to the characteristics of chirp signal and the principle of optical heterodyne detection, the expression of the output signal after the chirp signal is detected by synthetic aperture lidar with high-order phase error is deduced. Combined with the system structure of reference channel and the phase compensation algorithm based on sharpening function, the impact of reference channel type on single-point target imaging is analyzed by simulation. By studying the physical meaning of the sharpening function, the error of the sharpening function phase compensation algorithm is analyzed. The applicable range of sharpening function phase compensation algorithm is pointed out, and further consideration is needed to realize high quality synthetic aperture lidar imaging.