小波降噪在相位差变化率定位技术中的应用

Applying Wavelet De-Noising to Passive Location Technology Based on Phase Difference Rate of Change

针对实际工程中因相位干涉仪的测量误差较大而导致相位差变化率的测量精度较低、定位精度迅速下降的问题,利用小波阈值降噪法对相位差及其变化率信息进行平滑滤波。该方法可在相位差测量误差较大的情况下进行快速高精度定位。仿真结果表明,相位差测量误差为0.3665 rad时,相对定位精度在50 s内可达5%。

In practice the phase difference measuring error with phase-interferometer is so great that we can＇t acquire precise phase difference rate of change ted, which makes use of wavelet threshold , and the location precision declines rapidly. A method is presen- de-noising algorithm to level off the metrical phase difference and metrical phase difference rate of change. Consequently the radiant point target can be located with high speed and precision in case of great measuring error of phase difference. Simulations show that this method can reach 5% relative location precision in 50 s when measuring error of phase difference is 0. 366 5 rad.