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给出了激光测高仪接收信号模型的建立过程,并模拟了斜坡地形下接收信号的波形图。为了判定是否可以将接收信号简化为高斯信号处理,提出了以高斯拟合误差对测距精度的影响作为判定依据。以MOLA系统为例,采用LM非线性拟合算法,得到了不同目标倾斜角及阈值情况下,最优化高斯拟合波形与实际接收信号波形的误差。详细分析了MOLA系统中拟合误差对系统测距精度的影响。结果表明,这个影响相对于系统测距误差而言,可以忽略不计。因此,将MOLA系统的接收信号简化成高斯信号处理是完全可行的。
The establishment process of laser altimeter receiving signal model is given and the waveform of received signal under the slope terrain is simulated. In order to determine whether the received signal can be reduced to Gaussian signal processing, the Gaussian fitting error is proposed to determine the effect of ranging accuracy. Taking the MOLA system as an example, the error of the optimized Gaussian fitting waveform and the actual received signal waveform is obtained under different target tilt angles and thresholds by using LM non-linear fitting algorithm. The effect of fitting errors in MOLA system on the accuracy of the system is analyzed in detail. The results show that this effect is negligible relative to the system ranging error. Therefore, it is feasible to simplify the received signal of MOLA system to Gaussian signal processing.