再入环境中的遥测信号软解调研究

Research on Soft Demodulation of Telemetry Signal in Reentry Telemetry Environment

摘要:

PCM/FM遥测形式是飞行器再入遥测中应用较广泛的一种信号体制；针对跟踪目标再入过程中信噪比较低,而传统非相干鉴频法存在门限过高的问题,结合调频遥测信号的相位连续性,研究一种基于基带正交复旋转多符号检测(MSD)的软件化解调方法；通过仿真,验证了该方法可使解调门限有效降低。

Abstract:

PCM/FM system is one of the most widely used in the missile and rocket telemetry system. For the problem that the breakthrough tradition demodulation method of demodulation threshold leaded by the telemetry signals low signal noise ratio (SNR) of target spacecraft reentry telemetry environment, a baseband complex rotating orthogonal MSD based soft PCM/FM signal demodulation method is studied combined with the PCM/FM signal phase characteristic. The corresponding synchronization algorithm is applied to ensure the smooth operation of the demodulation. The simulation and test results verify the soft demodulation algorithm can make reduce the demodulation threshold effectively.