摘要
分析了车流量检测雷达中频信号的特点,探讨了小波变换在中频信号去噪中的应用;分别采用小波变换阈值法、平移不变量法和小波变换模极大值法对中频信号进行了去噪处理并对这三种方法的去噪性能进行了分析;实验结果表明,三种方法均能有效的抑制噪声,其中小波阈值法去噪效果较好,计算速度很快;平移不变量法去噪效果略优于小波阈值法,但计算速度较慢,模极大值法虽然取得了最好的去噪效果,但计算速度很慢;综合而言,小波变换阈值法最具实用价值。
The characteristics of IF signal of vehicle volume detecting radar is analyzed, the application of wavelet transtorm in the de-noising for the IF signal is discussed. The wavelet threshold method, the translation invariant method and the wavelet transform modulus maxima method are used to de-noising for IF signal and the performances of the methods are analyzed. The experimental results show the three methods can suppress the noise effectively, the wavelet threshold method has good performance and little computation; the translation invariant method is better than wavelet threshold method but has more computation; the wavelet transform modulus maxima method has the best performance but has much computation. In general, the wavelet threshold method has highest practical value among the three methods.
出处
《计算机测量与控制》
CSCD
2008年第4期564-566,共3页
Computer Measurement &Control
基金
上海市信息化专项基金项目(123)
关键词
小波变换
去噪
车流量检测雷达
wavelet transform
de-noising
vehicle volume detecting radar
