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合成孔径激光成像雷达发射的信号一般为线性啁啾激光信号,然而激光器的实际扫频特性会产生二次及高次等非线性项。非线性项的存在会造成相位误差,导致距离向成像聚焦模糊,降低距离向成像分辨率,因此必须对光源的非线性啁啾进行补偿。因此提出非匹配参考通道匹配滤波算法对非线性啁啾相位误差进行克服。仿真结果显示,距离向图像可以得到较好压缩。同时,还分析了参考通道长度及非线性贡献比例等不同参数环境下的距离向压缩效果。
Synthetic aperture laser imaging radar signals are usually linear chirp laser signal, however, the actual sweep characteristics of the laser will produce second and high order nonlinear term. The existence of non-linear term will cause the phase error, resulting in blurred distance from the imaging focus, reducing the distance to the imaging resolution, it is necessary to compensate for the nonlinear chirp of the light source. Therefore, a non-matching reference channel matching filter algorithm is proposed to overcome nonlinear chirp phase error. Simulation results show that the distance image can be better compressed. At the same time, the effect of distance compression under different parameters such as reference channel length and nonlinear contribution ratio is analyzed.