旋转飞行器分集式测速信号处理方法

Processing of Spacecraft Diversity Doppler Signal under Spinning Flight

飞行器旋转飞行时,采用分集多天线方式,可以实现信号的全向接收和向地转发。由于飞行器的转动,测量会引入微多普勒效应作用,受工作天线变换影响,接收测速信号(多普勒频率)会阶跃变化,在锁相环的作用下又引入响应误差。为实现高精度测量必须从测量信号中处理出所需的飞行器中心运动信息。针对这一问题,研究并推导了四天线分集式双程应答多普勒测速方程,分析了该模式下理想及测速回路(锁相环)响应信号的特点,提出了分集式测速信号处理方法。仿真实验结果表明,该方法可以有效滤除锁相环响应误差、分离微多普勒频率,得出高精度中心速度测元。

When a radar’s target undergoes spinning in addition to constant bulk motion under transponding mode,in order to let the target receive and the transmit signal from any directions,and the Doppler information can be got from the radars,diversity multi-antennas mode is brought forward. However,besides the micro-Doppler effect induced by spinning, this mode brings frequency steps,which have great influence on Doppler-Loops and brings new error. To get the Doppler information of target center’s movement,the formulas of the double-distance Doppler signal under four diversity antennas are derived,the influence of this mode on Doppler-Loops is analyzed,and then the process and the detail method are introduced. Finally,simulation experiment shows this method to be feasible.