合肥工业大学学报（自然科学版）
閤肥工業大學學報（自然科學版）
합비공업대학학보（자연과학판）
JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY(NATURAL SCIENCE)
2014年
9期
1089-1092
,共4页
GNSS信号%时频分析%短时傅里叶变换%Wigner-Ville分布%卫星导航接收机
GNSS信號%時頻分析%短時傅裏葉變換%Wigner-Ville分佈%衛星導航接收機
GNSS신호%시빈분석%단시부리협변환%Wigner-Ville분포%위성도항접수궤
global navigation satellite system (GNSS) signal%time-frequency analysis%short-time Fou-rier transform(STFT)%Wigner-Ville distribution%GNSS receiver
GNSS（Global Navigation Satellite System ）信号在传播的过程中会受到各种连续波的干扰，以至于接收机很难根据GNSS信号进行准确的导航和定位。GNSS接收机接收到的信号是近平稳或者非平稳的，其统计量是时变函数。因此只了解信号在时域或频域的全局特性是远远不够的，还需要知道信号频谱随时间变化的情况。为了分析和处理非平稳信号，文章引入了时频分析的方法，利用其可以同时描述信号在时间和频率的能量密度和强度；通过短时傅里叶变换和Wigner-Ville分布分别处理被连续波干扰的GNSS信号，它们都能够捕获GNSS信号中连续波干扰的频率，再通过滤波器滤除连续波的干扰；利用Wigner-Ville分布和短时傅里叶变换，通过Matlab仿真分别检测GNSS信号中连续波干扰的频率，并比较两者性能的差异。
GNSS（Global Navigation Satellite System ）信號在傳播的過程中會受到各種連續波的榦擾，以至于接收機很難根據GNSS信號進行準確的導航和定位。GNSS接收機接收到的信號是近平穩或者非平穩的，其統計量是時變函數。因此隻瞭解信號在時域或頻域的全跼特性是遠遠不夠的，還需要知道信號頻譜隨時間變化的情況。為瞭分析和處理非平穩信號，文章引入瞭時頻分析的方法，利用其可以同時描述信號在時間和頻率的能量密度和彊度；通過短時傅裏葉變換和Wigner-Ville分佈分彆處理被連續波榦擾的GNSS信號，它們都能夠捕穫GNSS信號中連續波榦擾的頻率，再通過濾波器濾除連續波的榦擾；利用Wigner-Ville分佈和短時傅裏葉變換，通過Matlab倣真分彆檢測GNSS信號中連續波榦擾的頻率，併比較兩者性能的差異。
GNSS（Global Navigation Satellite System ）신호재전파적과정중회수도각충련속파적간우，이지우접수궤흔난근거GNSS신호진행준학적도항화정위。GNSS접수궤접수도적신호시근평은혹자비평은적，기통계량시시변함수。인차지료해신호재시역혹빈역적전국특성시원원불구적，환수요지도신호빈보수시간변화적정황。위료분석화처리비평은신호，문장인입료시빈분석적방법，이용기가이동시묘술신호재시간화빈솔적능량밀도화강도；통과단시부리협변환화Wigner-Ville분포분별처리피련속파간우적GNSS신호，타문도능구포획GNSS신호중련속파간우적빈솔，재통과려파기려제련속파적간우；이용Wigner-Ville분포화단시부리협변환，통과Matlab방진분별검측GNSS신호중련속파간우적빈솔，병비교량자성능적차이。
Global navigation satellite system (GNSS) signals will be affected by a variety of continuous wave interference in the process of transmission ,so that it is difficult to offer accurate navigation and position based on GNSS receiver signal .As the GNSS receiver’s signal is stationary or non-stationary , its statistic is a time-varying function ,so understanding global characteristics of the signal in time or frequency domain is not enough ,and it is necessary to know the signal spectrum changes over time .In order to analyze and deal with the non-stationary signals ,the time-frequency analysis method is intro-duced in this paper ,w hich can be used to describe the energy density and intensity of the signal in dif-ferent time and frequency .The short-time Fourier transform (STFT ) and Wigner-Ville distribution are used to process the continuous wave interference of GNSS signal respectively ,the continuous wave jamming signal spectrum in GNSS signal can be captured ,and the continuous wave interference is re-moved through the filter .Based on Matlab simulation ,the continuous wave jamming signal spectrum in GNSS signal distribution is detected with STFT and Wigner-Ville distribution respectively ,and their performance is compared .
