Passive Localization Deception Approach Using Frequency Diverse Array

Passive localization technology plays an important role in the field of electronic countermeasures by its outstanding confidentiality and mobilization.At present,the method of combating passive localization still uses the method against active radar,which has many limitations.Based on the thoroughly analysis about the characteristics of frequency diverse array(FDA)beam-patterns,a new passive localization deception method by the use of FDA antenna is propose.Compared with the traditional countermeasure method,the technology has the characteristics of wide application range,simple system and easy adjustment of the countermeasure effect.The main research work of this thesis is as follows:1.The passive direction of arrival(DOA)localization deception method is proposed.The interferometer measurement deception model and the Multiple Signal Characterization(MUSIC)deception model are established respectively.The Cramer's lower bound(CRLB)for measuring the angular error under these two models is derived,which theoretically proves that FDA signal is angularly deceptive.Numerical simulations provides FDA shows robust angular localization deception performance in different conditions.2.The passive frequency different of arrival(FDOA)and time different of arrival(TDOA)localization deception method based on FDA is proposed.The cross ambiguity function of FDOA/FDOA localization deception based on FDA method between the FDA and phased array(PA)is analyzed.The CRLB and Geometric Dilution of Precision(GDOP)under this module is derived,which theoretically proves that FDA signal potentially has FDOA/FDOA localization deception characters.The simulation experiment analyzes the influence of different parameters on localization deception performance.3.Aimed at FDOA localization method,a new localization deception method based on FDA is proposed.The effects of FDA signals on the frequency estimation performance of Fast Fourier Transform(FFT)and Chirp-Z transform are respectively analyzed under the FDOA localization deception model.The GDOP of FDOA based on FDA signals is derived and the influence of different parameters on the FDOA localization deception performance is explored.