自然地物对星载激光测高仪回波特性的影响

详细信息

Effect of natural terrain object on return signal of space based laser altimeter

School of Instrument Science and Opto-electronics Engineering, Beihang University, Beijing 100191, China

摘要: 为了研究沙漠、草地等具有连续分布特点的自然地物对星载激光测高仪回波特性的影响,以菲涅耳衍射理论为基础,建立连续地面物理模型,采用网格划分的方法,对地面平均高度以及地面高度均方差对回波形状、功率和脉冲宽度等特性的影响进行了数值模拟研究。结果表明,若地面高度均方差一定,地面平均高度的变化不会引起脉冲回波信号的变化,而地面高度均方差的变化会直接导致回波信号的变化。
- 激光技术 /
- 激光测高仪 /
- 回波信号 /
- 地面平均高度 /
- 地面高度均方差
Abstract: According to the theory of Fresnel diffraction,a continuous land model was established for natural terrain like desert and grass land,a method of gridding partition was developed to simulate the effect of average surficial height and height mean square error on the properties of return signal,including waveform,power and pulse width.The results show that height mean square error determines the properties of return signal,while the change of terrain mean height cause no difference in return signal in the case of fixed height mean square error.
- laser technique /
- laser ranging /
- return signal /
- surficial average height /
- surficial height mean square error

[1]	LIS.Recent progreas of spacebome laser altimeter system[J].Optics & Optoelectronic Technology,2004,2(6):4-6(in Chinese).
[1]	BUFTON J L.Laser altimetry measurement from aircraft and apacecraft[J].Proceedings of the IEEE,1989,77(3):463-477.
[2]	DAI B M,ZHANG Ch,LI D Sh.Analysis of ranging error of pulse laser ranger[J].Laser Technology,1999,23 (1):50-52 (in Chiese).
[3]	HARDING D L,BUFITON J L,FRAWLEY J J.Satellite laasr altimeter of terrestrial topography:vertical accuracy as a function of surface slope,roughness,and cloud cover[J].IEEE Transaction on Ceoscience and Remote Sensing,1994,32(2):329-339.
[4]	GARDNER C S.PurnEing performance of satellite laserahimeters[J].IEEE Transaction on Geoscience and Remote Sensing,1992,30(5):1061-1072.
[5]	LI S,ZHOU H,SHI Y,et al.Theoretical model for returnsignal of laser altimeter[J].Optics and Precision Engineering,2007,15(1):33-39(in Chinese).
[6]	ZHOU H,LI S.Waveform simulator of returm signal for laser altimeter[J].Chinese Journal of Laser,2006.33(10):1402-1046(in Chinese).
[7]	FANG Q H,ZHAO Y L.The research progress in data processing algorithm of satellite laser ranging[J].Laser Technology,2008,32(4):417-423(in Chinese).
[8]	GOODMAN J W.Introduction to Fourier optics[M].Beijing:Science Press,1980:68(in Chinese).
[9]	GARDNER C S.Target signatures for laser altimeters:an analysis[J].Applied Optics,1982,21 (3):448-453.