脉冲超宽带信号测量性能分析

超宽带技术是一项新兴的无线通信技术,具有极其广阔的发展前景,但目前仅用于室内短距离通信,少见用于航天测控系统。为了将超宽带技术应用于测控系统中,以模糊函数为工具,对脉冲超宽带信号的测量性能进行分析。首先推导矩形脉冲串信号和载波调制矩形脉冲串信号的模糊函数,并对其模糊特性进行仿真分析。在此基础上,主要针对用于测控系统的伪码调制脉冲超宽带信号,利用其模糊函数分析其测距测速性能。结果表明:该超宽带信号具有良好的测距测速性能,其最大无模糊距离为1个伪码周期,最大无模糊多普勒频率为脉冲重复频率的倒数;单脉冲宽度越窄,其测距性能越好而测速性能越差。

Analysis of the Measuring Performance of UWB Signals

UWB (Ultra Wideband), an emerging and promising wireless communication technology, is rarely used in space TT&C (Tracking, Telemetry and Command) systems although it has been extensively used in indoor short distance communication.To apply UWB technology in space TT&C systems, the measuring performance of UWB signal is analyzed using ambiguity function as a tool.First, the ambiguity function of rectangular pulse sequence signal and carrier modulation rectangular pulse sequence signal are derived and their ambiguity characteristics are simulated and analyzed.On this basis, aiming at the pseudorandom code modulation UWB signal used in space TT&C systems, its range and range rate measuring performance are analyzed using its ambiguity function.The results show that this UWB signal has good ranging and range rate measuring performance and its maximum unambiguity range is one period of the pseudorandom code and its maximum unambiguity Doppler frequency is the reciprocal of pulse repetition frequency.The narrower the single pulse width is, the better the range measuring performance is, and the worse the range rate (Doppler) measuring performance is.