The Key Technology Research Of Long Baseline Interferometer Direction Finding

During the Information technology era, electronic warfare has became the undisputed modern warfare important part. Radio direction finding technique is an important aspect of electronic warfare. It can even determine the battlefield initiative of the future. The current DF technology contains that the amplitude method, interferometer and pectral estimation Direction Finding system. With the complexity of the electromagnetic environment gradually increased, the increasingly widespread use of broadband signals, although Interferometer DF technology is relatively mature, it still can be improved. In this context conditions, the interferometer DF techniques was studied in the paper.The purpose is to in-deep study the technology of phase ambiguity, the channel amplitude and phase consistency, phase detector and data processing.In addition, in some aspect the paper propose the appropriate improvements.(1) Based on L array and Criss-cross array do some simulation on the standard cross-correlation interferometer algorithm and phase interferometer algorithm.(2) For improving the performance of the phase interferometer, by leveraging the L-shaped array baseline fully, a new algorithm improves the azimuth estimation accuracy of the L-shaped phase interferometer array was proposed.(3) A redundant virtual baseline defuzzification technique was proposed for the line-array phase interferometer proposed.The conclusions show that the probability of correct of defuzzification is improved on the condition of large incident angle.(4) A joint algorithm was proposed, combine phase interferometer and MUSIC algorithm.The conclusion shows that it can improve the accuracy of L matrix phase interferometer. But it must spend more calculation time. The contradictions between high accuracy and real-time performance can be effectively solved. In addition, the program of virtual circular array transformation method was designed. The conclusion shows that it can effectively improve the circular array phase interferometer working applicable band.(5) For receiving channel amplitude and phase inconsistencies affect direction finding accuracy. Analyzing the sources of error. Do some intensive researchs on the correction method of the channel amplitude and phase inconsistent. According the study and some simulations it can get a conclusion, the paper proposed several correction algorithms. All of them can effective correct the channel amplitude and phase inconsistent.The algorithm modeling and simulation which appears in the paper uses MATLAB as simulation platform. Conclusions show that the improved algorithms for the phase interferometer which is proposed by the paper can achieve the desired design program objectives and have a certain reference value on the application of the actual project.