基于Wigner-Ville时延分析的传感器网络定位方法

Sensor Network Localization Method Based on Wigner-Ville Time Delay Analysis

到达时间差(TDOA)定位是根据各个传感器接收信号的时差来实现目标定位的,时延估计的准确程度直接影响到定位的精度。从信号能量角度出发,根据Wigner-Ville变换得出一种时频能量分布,通过对应频率下能量的最大值来确定信号的到达时间,进而确定出时间差,同时计算了振动信号在实验介质中的传播速度,最终实现了振动定位的目的。试验结果表明,基于WVD时频能量分析的方法有利于减少实际测量环境下的振动源定位误差,从而提高定位的精度。

Time difference of arrival( TDOA) location is based on the time difference of each signal received by the sensor to achieve the target location,the accuracy of time delay estimation directly affects the accuracy of location. From the perspective of signal energy,coming up with a time-frequency energy distribution according to Wigner-Ville transform,the arrival time of the signal is determined by the maximum value of the corresponding frequency energy,and to confirm the time difference and calculate the propagation velocity of vibration signal in the experiment medium,achieving the purpose of positioning the vibration,ultimately. Test results showed that the method based on WVD time frequency energy analysis is advantageous to reduce the error of vibration source localization in the actual measurement environment,so as to improve the accuracy of positioning.