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根据线性调频信号的特点和光外差探测的原理,推导了合成孔径激光雷达外差探测的输出信号表达式。针对点阵目标模拟了条带工作模式时的数据图像,先对距离向进行傅里叶变换后校正剩余视频项,再对方位向进行相关运算,进而实现了目标图像的重构。推导得到了目标图像在距离向和方位向的解析表达式,分析了目标图像在距离向和方位向的强度分布曲线的特点及其对成像的影响。分析了影响图像分辨率的因素和改进方法,为优化算法和系统设计提供了参考。
According to the characteristics of chirp signal and the principle of optical heterodyne detection, the output signal expression of synthetic aperture lidar detection is deduced. For the dot matrix simulation data of the strip work mode, the first Fourier transform the distance after the correction of the remaining video items, and then the azimuth to carry out the relevant operations, and then to achieve the target image reconstruction. The analytic expressions of the target image in distance and azimuth are deduced. The characteristics of the intensity distribution curve of the target image in the distance and azimuth and its influence on the imaging are analyzed. The factors affecting the resolution of the image and the improved methods are analyzed, which provide references for the optimization of algorithms and system design.