摘要
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 procedure to setup a return signal model of laser altimeter was given.The waveforms of return signal from slope terrains were simulated. The impaction of Gauss fitting-error on ranging precision was used to determine whether return signal was Gaussian or not. The difference between optimum fitting-waveforms and practical waveforms of MOLA return signal, with different~ target slope angle and threshold value,were obtained by using LM nonlinear algorithm. The impaction of fitting-error on ranging precision of MOLA was analyzed.The result reveals that the impaction is too small to be considered. It means that it is feasible to regard the return signal of MOLA as Gaussian shape.
出处
《红外与激光工程》
EI
CSCD
北大核心
2006年第3期318-321,共4页
Infrared and Laser Engineering
关键词
高斯函数
LM算法
拟合误差
测距精度
Gaussian function
LM algorithm
Fitting-error
Ranging precision
