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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Mohammed A, Chemnitzer H, and Last D. Full performanceanalysis of IFFT spectral-division technique for skywaveidentification in Loran-C receivers[C]. Proc. 31st AnnualConvention and Technical Symposium, International LoranAssociation(ILA31), Washington, DC, 2002: 1-10.[2]Mohammed A and Last D. IFFT technique for skywavedetection in Loran-C receivers[J]. Electronic Letters, 200l,37(6): 398-400.[3]Mohammed A. Effect of Loran-C signal parameters onskywave delay estimation of IFFT technique[J]. ElectronicLetters, 2003, 39(14): 1091-1093.[4]胡东亮,杨迎春,范菊红. 基于MUSIC 算法的罗兰C 接收机天地波自动识别方法研究[J]. 海军工程大学学报,2006, 18(3):7-9.Hu Dong-liang, Yang Ying-chun, Fan Ju-hong. Loran-Creceiver skywave detection based on MUSIC algorithms[J].Journal of Naval University of Engineer, 2006, 18(3): 7-9.[5]周新力,刘华芹,孟庆萍等. 罗兰C 接收机天波识别技术研究[J]. 现代电子技术, 2007, (23): 36-44.Zhou Xin-li, Liu Hua-qin, and Meng Qing-pin, et al.. Researchon Loran-C skywave detection[J]. Modernistic ElectronicTechniques, 2007, (23): 36-44.[6]朱银兵,许江宁,王红星等. 基于IFFT 频谱相除的罗兰C 天地波识别新算法[J].电子与信息学报.2009, 31(5):1153-1156浏览[7]唐艳,汤井田. 基于Wigner 高阶谱的ECG 信号分析[J]. 电子科技大学学报,2007, 36(1): 143-145.Tang Yan and Tang Jin-tian. Analysis of ECG signal base onWigner-Ville high-order spectra[J]. Journal of University ofElectronic Science and Technology of China, 2007, 36(1):143-145.
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