Abstract:

In practice the phase difference measuring error with phase-interferometer is so great that we cant acquire precise phase difference rate of change,and the location precision declines rapidly.A method is presented,which makes use of wavelet threshold 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.

Key words: wavelet de-noising, phase difference rate of change, threshold, passive location