适用于宽带星地链路无线电系统的电离层色散模拟方法

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适用于宽带星地链路无线电系统的电离层色散模拟方法

本发明提供一种通用的适用于宽带星地链路无线电系统的电离层色散模拟方法，具体步骤为：步骤1：利用频率为ω L 的理想本振信号对宽带、任意波形的输入信号S(ω)做正交解调，得到复基带输入信号S b (ω)；步骤2：根据无线电波传输路径上的总电子含量TEC，将电离层色散特性对无线电波的影响建模为一个幅度恒定的非线性相位系统；步骤3：根据任意选择的参考频点ω o 将H iob (ω)分解为三个简单且易于实现的系统；步骤4：设计H l(ω)，H o (ω)和H nl (ω)系统，并将复基带输入信号S b (ω)依次通过上述三个系统，得到输出信号S iob (ω)；步骤5：利用频率为ω L 的理想本振信号S L2 (ω)＝2πδ(ω-ω L )对S iob (ω)做正交调制，得到电离层色散模拟输出信号S io (ω)。本发明色散特性的模拟无需知道信号形式、信号参数等先验信息，具有通用化的特点。

Ionosphere dispersion simulation method applicable to broadband satellite-to-earth link wireless system

The invention provides a universal ionosphere dispersion simulation method applicable to a broadband satellite-to-earth link wireless system. The ionosphere chromatic dispersion simulation method comprises the specific steps that 1, ideal intrinsic signals with the frequency being omega _L are used for conducting quadrature demodulation on broadband random waveform input signals S(omega) to obtain complex baseband input signals S_b(omega); 2, the influence of ionosphere dispersion characteristics on radio waves is modeled to a nonlinear phase system with the constant amplitude according to the total electron content (TEC) on a radio wave transmission route; 3, an H_iob(omega) is decomposed into three simple and easy-to-realize systems according to randomly selected reference frequency points omega₀; 4, an H₁(omega) system, an H₀(omega) system and an H_n1(omega) system are designed, and the complex baseband input signals S_b(omega) sequentially pass through the three systems to obtain output signals S_iob(omega); and 5, ideal intrinsic signals S_L2(omega)=2pidelta(omega-omega_L) with the frequency being omegaL are used for conducting quadrature demodulation on S_iob(omega), and the output signals S_io(omega) of ionosphere dispersion simulation are obtained. According to the ionosphere dispersion simulation method, apriori information such as signal forms and signal parameters does not need to be known for the dispersion characteristic simulation, and the universalization characteristic is achieved.