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。

Based on the LFM(Linear Frequency Modulation) signal and the principle of the heterodyne, the expression on the output of the heterodyne detection in synthetic aperture ladar was induced in detail with the considerations of phase error. Combining with the reference channel design and phase compensation algorithm, the influence of reference channel design on single point object image had been analyzed by simulation. Some error analysis concerning the compensation algorithm with sharpen function had been given by researching the physical meaning of sharpen function. Finally, the application scope of the phase compensation algorithm with sharpening function had been given out, and some problems to realize high quality synthetic aperture laser radar imaging had been pointed out in these paper.