张雷洪, 孙刘杰, 马秀华. 激光跟踪中目标卫星表面BRDF对回波信号的影响[J]. 红外与激光工程, 2012, 41(8): 2048-2052.
引用本文: 张雷洪, 孙刘杰, 马秀华. 激光跟踪中目标卫星表面BRDF对回波信号的影响[J]. 红外与激光工程, 2012, 41(8): 2048-2052.
ZHANG Lei-Hong-, SUN Liu-Jie-, MA Xiu-Hua-. 激光跟踪中目标卫星表面BRDF对回波信号的影响[J]. Infrared and Laser Engineering, 2012, 41(8): 2048-2052.
Citation: ZHANG Lei-Hong-, SUN Liu-Jie-, MA Xiu-Hua-. 激光跟踪中目标卫星表面BRDF对回波信号的影响[J]. Infrared and Laser Engineering, 2012, 41(8): 2048-2052.

激光跟踪中目标卫星表面BRDF对回波信号的影响

激光跟踪中目标卫星表面BRDF对回波信号的影响

  • 摘要: 通过双向反射分布函数(BRDF)公式,模拟了空间激光主动照明跟踪中,相同材料、不同粗糙度下卫星表面的BRDF,得出了随着卫星表面材料粗糙度的增加,镜面反射分量越小,漫反射分量越大,双向反射分布散射角越宽,接收到的回波信号对方向的敏感性减小。同时模拟了入射角度对卫星表面BRDF的影响,得出了照明光束小角度入射、接收信号方向与照明光束方向一致时,镜面反射分量的增加增强了反馈信号,当大角度入射时,反馈信号急剧减小。当入射角大于34时,通过卫星表面BRDF计算得到的最小接收功率,比之前把卫星目标看成朗伯体,通过激光雷达公式计算得到的最小接收功率小。得出了增加照明光束的发射功率为原来的5倍,或者增大接收口径为原来的2.5倍,可以消除大入射角度带来的接收功率的减小,使得系统有4倍的功率余量。

     

    Abstract: The bidirectional reflection distribution of target satellite surface with different roughness was simulated by the formula of the bidirectional reflection distribution function(BRDF) in laser tracking in the space. The component of diffuse reflection became larger and the component of specular reflection became smaller with the increase of the target surface roughness. Meanwhile, the scattering angle became larger. These benefited the random receiving direction and decreased the sensitivity of receiving direction. The varieties of BRDF of target satellite surface affected by the change of the incident angle were also simulated. The change of bidirectional reflection distribution was obtained. The receiving echo increased with the increase of the component of specular reflection, when the incident angle was small and the illumination beam axis and receiving telescope axis were coaxial. The receiving echo power decreased quickly with the increase of the incident angle. When the incident angle was larger than 34, the minimum receiving echo power computed by BRDF was lower than the one computed by the formula of lidar supposing that the target satellite surface was Lambertian reflection plate. The illuminating laser power should become 5 times the former one or the receiving aperture became 2.5 times the former one. These methods could remove the effect of the decrease of the receiving echo power.

     

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