一种组合调制的脉冲超宽带测控信号

将脉冲超宽带(IR-UWB)信号应用于航天测控领域,能够有效提高当前航天测控系统的隐蔽性、抗干扰性和测量性能,具有重要的现实意义.将DS-PAM(Direct Spread-Pulse Amplitude Mod-ulation)调制、TH-PPM(Time Hopping-Pulse Position Modulation)调制的信号和PSM(Pulse Shape Modulation)调制技术组合起来,可构成一种新的组合调制的脉冲超宽带信号,即DS-PAM-TH-PPM-PSM-UWB(Direct Spread-Pulse Amplitude Modulation-Time Hopping-Pulse Position Modulation-Pulse Shape Modulation-Ultra Wideband)信号.利用对数正态阴影模型分析其传输性能,在单频干扰信号条件下分析其抗干扰性能,利用模糊函数分析其测量性能.仿真结果表明,相比于传统的DS-PAM-UWB信号和TH-PPM-UWB信号,该组合信号具有良好的传输性能、抗干扰性能和测量性能,为脉冲超宽带信号应用于航天测控领域提供了更多的选择.

A combined modulation IR-UWB TT&C signal

Applying Impulse Radio-Ultra Wideband ( IR-UWB ) signal in space tracking, telemetry and command( TT&C) system can effectively improve concealment,anti-interference performance and measure-ment performance of TT&C system. This paper intends to combine Direct Spread-Pulse Amplitude Modula-tion(DS-PAM),time hopping-pulse position modulation(TH-PPM) signal and pulse shape modulation ( PSM) technique to constitute a new combination of pulse modulated ultra-wideband signal called DS-PAM-TH-PPM-PSM-UWB ( Direct Spread-Pulse Amplitude Modulation-Time Hopping-Pulse Position Modulation- Pulse Shape Modulation-Ultra Wideband ) signal . By using the lognormal shadowing path loss model,the transmission performance is analyzed. Its anti-interference performance is analyzed under single-frequency signal interference condition and its measurement performance is analyzed using ambigui-ty function. Simulation results show that the transmission performance,anti-jamming performance and per-formance measurement of the combined signal are improved compared with conventional DS-PAM-UWB signal and TH-PPM-UWB signal. Therefore more choices are provided for application of IR-UWB signal in TT&C field.