罗兰C周期识别时频分析方法研究
doi: 10.3724/SP.J.1146.2009.00129
Time-frequency Methods for Period Identification of Loran-C
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摘要: 该文在分析罗兰C信号的STFT及WV时频变换表示基础上，仿真分析了天线输入端信噪比、天地波幅值比以及天地波相位差对罗兰C信号STFT及WV时频变换的影响。结果表明，罗兰C信号STFT及WV变换的峰值稳定，抗噪声性能强，但都存在多值性，而利用罗兰C信号WV变换的负峰值对应的频率点不同能够有效消除多值性，从而提出了基于WV变换的周期识别新方法。Abstract: Based on the analysis of Short Time Fourier Transform(STFT) and Wigner-Vill Transform(WVT) for Loran-C signal, influence of SNR at the antenna input, SGR(Sky-wave to Ground-wave Ratio) and phase difference on STFT and WVT for Loran-C signal are analyzed and simulated. The results show that peak values of STFT and WVT for Loran-C signal are steady, and noise can be restrained successfully. But they both have the issue of multi-values, moreover, the issue of multi-values of Loran-C signals WVT can be removed successfully and effectively because frequency points of its negative peak values are different when the arrival time interval of sky-wave and ground-wave is different, so a new period identification based on WVT for Loran-C is presented.
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