摘要
论述小波变换的数学理论和方法。根据小波变换的多分辨率分析方法,重点分析小波变换在导航系统中的作用;利用D aubech ies小波函数,采用阈值去噪法,可在低信噪比的情况下较准确地估计导航传感器的原始信号;分别针对多普勒系统和北斗双星定位系统,借助小波变换对其接收信号进行了离线仿真研究。仿真分析表明,应用小波变换的分层技术抽取特征参数效果明显,去噪效果亦较为理想。
The theory of wavelet analysis and the multi-resolution analysis method are introduced and then applied to analyze navigation sensor noise in this paper. By means of Daubechies wavelet function and using threshold decreasing noise method, the original value of ship navigation sensor can precisely be estimated under the low signal-to-noise ratio. According to the character of Bei Dou satellite navigation positioning system, off-line simulation research on the received signal is performed using wavelet transform. The simulation research results show that the effectiveness of the method filtering out sensor noise is very obvious.
出处
《中国造船》
EI
CSCD
北大核心
2006年第3期84-89,共6页
Shipbuilding of China
关键词
船舶
舰船工程
小波分析
导航传感器
仿真
ship engineering
wavelet analysis
navigation sensor
simulation
