罗兰C周期识别的Wigner-Vill变换分析  

Wigner-Vill Transformation Analysis for Cycle Identification of Loran-C

作　　者：朱银兵[1] 许江宁[1] 曹可劲[1] 崔国恒[1] 

机构地区：[1]海军工程大学电气与信息工程学院,武汉430033

出　　处：《弹箭与制导学报》2010年第2期211-214,共4页Journal of Projectiles,Rockets,Missiles and Guidance

基　　金：国家自然科学基金(40676055);海军工程大学基金(HGDJJ07028)资助

摘　　要：为了改善时域或频域分析的局限性,提高罗兰C的周期识别能力,在分析罗兰C信号的Wigner-Vill变换特征基础上,仿真分析了样本长度、天线输入端信噪比、天地波幅值比及天地波相位差等对罗兰C周期识别的影响。结果表明,罗兰C信号的Wigner-Vill变换峰值稳定、抗噪声性能强,利用不同天地波相位差下罗兰C信号的Wigner-Vill变换最小峰值对应的频率点不同,能够有效的实现罗兰C信号的周期识别。For improving the limit of time domain or frequency domain analysis and the cycle identification capability for Loran-C, the effect of swatch＇s length, signal-to-noise ratio（SNR） at the antenna input, sky-wave to ground-wave ratio（SGR） and phase difference of sky-wave to ground-wave on cycle identification of Loran-C were analyzed and simulated based on the analysis of Loran-C signal＇s Wigner-Vill transformation（WVT） characters. The results show that positive peak values of Loran-C signal＇s WVT are steady, the transformation has good anti-noise performance, and cycle identification can be realized successfully and effectively because the frequency points corresponding to the negative peak values of Loran-C signal＇s WVT are different at different phase difference.

关 键 词：罗兰C 周期识别 Wigner-ViU变换 

分 类 号：TN961[电子电信—信号与信息处理]