一种脉冲超宽带测控信号及其性能分析

摘要

将脉冲超宽带技术应用于航天测控系统，可大大提高测控信号的安全性。对测控信号形式的选择是脉冲超宽带测控系统中首先要考虑的问题。将目前常用的两种脉冲超宽带信号形式相结合，提出了一种同时对脉冲进行幅度调制和位置调制的混合调制脉冲超宽带测控信号。利用对数正态阴影衰落模型分析了信号的传输性能，利用模糊函数分析了信号的测量性能，同时针对阻塞式噪声干扰，分析了信号的抗干扰性能。仿真结果表明，混合调制脉冲超宽带测控信号具有良好的传输性能、测量性能和抗干扰性能，是一种较理想的脉冲超宽带测控信号形式。%Using the impulse radio-ultra wideband(IR-UWB)technology into the tracking,telemetry and command (TT&C)system can greatly improve the security performance of the TT&C signal.And the problem that should be firstly considered is the selection of the TT&C signal scheme.Combining the two IR-UWB signal schemes commonly used currently,a new kind of hybrid modulation IR-UWB TT&C signal scheme is pro-posed,conducting amplitude modulation and position modulation to the pulse at the same time.Its transmission performance is analyzed by using the lognormal shadowing path loss model,its measuring performance is ana-lyzed by using ambiguity function,and its anti-interference performance is analyzed in terms of blocking noise interference.Simulation results show that the hybrid modulation IR-UWB TT&C signal scheme has quite good transmission performance,measuring performance and anti-interference performance.It is an ideal IR-UWB TT&C signal scheme.