摘要: |
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 Modulation)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。 |
关键词: 航天测控 脉冲超宽带信号 传输性能 抗干扰性能 测量性能 |
DOI: |
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A combined modulation IR-UWB TT&C signal |
MENG Xiangli,HOU Xiaomin,LIAN Xin |
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Abstract: |
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 measurement performance of TT&C system. This paper intends to combine Direct Spread-Pulse Amplitude Modulation(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 ambiguity function. Simulation results show that the transmission performance,anti-jamming performance and performance 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. |
Key words: space TT&C;impulse radio-ultra wideband(IR-UWB) signal transmission performance anti-interference performance measurement performance |