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由于机载凝视成像激光雷达对地测距采用稳定平台,抑制了飞行过程中的高频振动,随机振动影响成像质量的成分主要是中低频振动。建立了随机振动模糊的理论模型,分析了采用多曝光叠加的动态成像过程中像素间串扰的影响机理。结合双通道三维主动测距方案,通过对具体的稳定平台振动谱的分析,研究了曝光时间与像素串扰半径、相对测距误差系数之间的关系。通过仿真程序得出满足横向分辨率要求下的最佳曝光时间,从而提高了系统的测距性能。
Because of the stable platform for on-the-air distance measurement of airborne staring imaging laser radar, the high frequency vibration is suppressed during the flight. The component of the random vibration affecting the imaging quality is mainly the low-frequency vibration. The theoretical model of random vibration blur is established and the influence mechanism of inter-pixel crosstalk in dynamic imaging using multi-exposure superposition is analyzed. Combined with two-channel three-dimensional active ranging scheme, the relationship between exposure time and pixel crosstalk radius and relative ranging error coefficient was studied by analyzing the vibration spectrum of the stabilized platform. Through the simulation program to meet the horizontal resolution requirements of the best exposure time, thereby improving the system’s ranging performance.