| 一种基于短时傅里叶变换的罗兰C信号频谱分析方法 |
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| 引用本文： | 孙伟玮,陈俊喆,王伟. 一种基于短时傅里叶变换的罗兰C信号频谱分析方法[J]. 现代导航, 2022, 13(5): 339-343 |
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| 作者姓名： | 孙伟玮 陈俊喆 王伟 |
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| 作者单位： | 海军装备部;中国电子科技集团公司第二十研究所,西安 710068 ；陕西省组合与智能导航重点实验室,西安 710068 |
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| 摘 要： | 当前对罗兰 C 信号的频谱分析基本上采用的是基于傅里叶变换法的频谱分析方法， 此类方法无法实现对信号频谱的实时监测。采用短时傅里叶变换法(STFT)对不同信干比、天波幅度和时延条件影响下的罗兰 C 信号进行理论建模与仿真，并建立信号的时频数据库。通过对罗兰 C 信号的 STFT 分析，并与时频数据库进行谱峰比对，可有效解决实时性要求较高的天地波识别与天波时延测量问题。
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| 关 键 词： | 罗兰 C；短时傅里叶变换；天波；频谱分析 |
Method for Spectrum Analysis of Loran-C Signals Based on Short Time Fourier Transform |
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| Sun Weiwei,Chen Jun,Wang Wei. Method for Spectrum Analysis of Loran-C Signals Based on Short Time Fourier Transform[J]. Modern Navigation, 2022, 13(5): 339-343 |
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| Authors: | Sun Weiwei Chen Jun Wang Wei |
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| Abstract: | The current spectrum analysis method of Loran-C signals based on Fourier transform method, which can not realize the real-time monitoring of the signal spectrum. The Short-Time Fourier Transform (STFT) method is used to model and simulate Loran-C signals under different signal-to-interference ratio, sky wave amplitude and delay conditions, and the time-frequency database of the signal is established. The STFT analysis of Loran-C signal and spectral peak comparison with time-frequency database can effectively solve the problem of sky wave identification and sky wave delay measurement with high real-time requirements. |
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