The method of interferometer phase un-wrapping in frequency domain

Electronic warfare has became the undisputed important part in the modern warfare. Radio direction finding technique is an important aspect of electronic warfare. It can even determine the battlefield initiative of the future. The existing direction finding technique technology contains that the amplitude method,time difference,interferometer and frequency-doppler direction finding system, interferometer has advantage in maturity,simplicity and high precision in different area.Comparing with the traditional interferometer phase un-wrapping based on muti-baseline, the paper raises a new method based on signal frequency domain, by extracting continuing trait of signal phase, un-wrapping phase by varying the ratio between baseline and signal wavelength, the method simplify traditional interferometer realization. The experiment result show that, the method has good robustness and high-precision DOA estimation, providing a new way to solve phase un-wrapping in traditional interferometer.