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被测目标表面的粗糙度会影响调频连续波(FMCW,Frequency ModulatedContinuous-Wave)相干激光雷达的拍频信号特性,进而影响雷达的测速测距精度.为衡量该影响以改善雷达的性能,通过对照射目标面的空间离散化,建立和分析了拍频信号的场强模型,并针对不同粗糙度的反射表面,进行了Monte Carlo模拟仿真及系统实验验证.仿真和实验结果表明:镜面目标反射面的倾斜将导致拍频信号交流分量强度的急剧衰减;而对于高斯型粗糙面目标,强度与粗糙面高度及波长的比值成负指数关系.实验结果与理论分析和模拟仿真结果一致,且系统的测距误差小于1 mm,静态速度稳定性优于0.1 mm/s.
The roughness of the measured target surface will affect the beat frequency characteristics of FMCW (Frequency Modulated Cuted-Continuous-Wave) coherent laser radar, which will affect the precision of the radar’s velocity measurement and ranging.To measure this effect to improve the performance of the radar, The space of the irradiation target surface is discretized, and the field strength model of beat frequency signal is established and analyzed. Monte Carlo simulation and system experimental verification are carried out for the reflection surface with different roughness. The simulation and experimental results show that the mirror target reflection surface Will lead to the sharp decay of AC component intensity of beat frequency signal.For the Gaussian rough surface target, the ratio of intensity to roughness height and wavelength has a negative exponential relationship.The experimental results are in good agreement with the theoretical analysis and simulation results, and the systematic Ranging error less than 1 mm, static speed stability better than 0.1 mm / s.