The laser radar Doppler spectrum of moving conical target in its spaced orbit observed by ground-based station

Abstract

Utilizing the characteristics of laser Doppler spectrum of rotating conical target in target coordinate system and combining with a hypothetical spaced orbit data and transformed relationships between space target, ground-based observation and geocentric coordinate system, the model on the laser radar Doppler spectrum of moving conical target in its orbit observed by ground-based station is presented in this paper. Three applied cases are detaily calculated and analyzed that the lidar normalized power of moving conical target observed by ground-based station is changed with the time of orbit and the Doppler frequency shift in different dimensions and roughness of conical target and different ground-based observed directions. The calculated results are shown that the dimension and roughness of orbited conical target and different ground-based observed directions have influnce on their laser Doppler spectrum. The rules of the lidar normalized power changed with the time of orbit and the Doppler frequency shift is periodically fluctuated for any spaced conical targets. As the rotation speed is constant, the dimension of conic target is bigger, Doppler frequency shift is higher. The roughess of the conic surface is bigger, the fluctuatations of lidar normalized power changed with the time of orbit and the Doppler frequency shift is strongger. So our works are based on further developed to theoretically study on all kinds of spased complex targets in their orbits and furth given a technological support for laser radar observing spased complex targets with micro-motion and distinguishing true/false targets in their orbits on gound-based station.