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最近若干年来作者在进行短波电离层传播信号色散的测量研究和理论分析时获得了一系列结果。主要包括: (1) 给出了远距离高频电路上进行短波相位起伏、多径展宽与多普勒展宽测量的统计分析资料。 (2) 对非高斯的输入变量,确定了线性或非线性(无记忆)包络检波器输出和输入均方根带宽之间以及输出和输入频谱之间的关系,并将所得结果应用于实时地同时测量多径展宽与多普勒展宽的实包络技术,而不必假定信道是高斯信道。 (3) 计算了选频短波信道上采用最大似然序列检测技术时的概率收敛速度和检测截止
In recent years, the author obtained a series of results when performing measurement research and theoretical analysis on dispersion of shortwave ionospheric signals. The main contents are as follows: (1) The statistical analysis data of shortwave phase undulation, multipath broadening and Doppler broadening measurement on long-distance high-frequency circuits are given. (2) For non-Gaussian input variables, the relationship between the output of the linear or non-linear (memoryless) envelope detector output and the input root mean square bandwidth and between the output and input spectra is determined and applied to real-time Simultaneous measurement of real envelope techniques for multipath and Doppler broadening without having to assume that the channel is a Gaussian channel. (3) Calculate the probability convergence rate and the detection cut-off when using the maximum likelihood sequence detection technique on the short-wave channel