Research On Digital Phased Array Multi-Functional Passive Detection Technology

With the rapid development of electronic information system technology, phased array technology has become more and more mature and widely used. In the need of future multi-function integrated of signal and target detection and positioning in military electronic information system, the phased array technology has been widely used in the new generation of multi-function electronic information system. It lays the foundation for the realization of multi task, multi-function sharing RF system and antenna aperture. The digital phased array technology of multi function integrated passive detection system can use the broad-band digital technology to realize the interception of emitter signal in wideband frequency domain and the high probability of interception, high accurate direction of arrival estimation and continuous track with digital beam forming technology, which has the flexible antenna beam scanning, high gain, low side lobe and the ability of forming multiple antenna beam and wide angle airspace coverage at the same time through the adoption of digital multi-beam instantaneous.This paper aimed at the development needs of the air/sea multi-functional integrated passive detection system technology, focus on the studying of digital multi-beam efficient airspace scanning strategy on wide angle coverage, the receipt DBF technology, the passive detection data processing and the design of digital phased array multi-function passive detection system.This paper analyzes the emitter signal intercept conditions in the frequency domain, airspace, and time of emitter signal intercept conditions. In terms of antenna beam position arrangement, the optimization model which is given based on the intercept probability, the average time of intercept and the airspace search quota according to the weight partition. The high intercept probability of the airspace search frame period can be abtained through the airspace search optimization model. The simulation analysis of the algorithm for the airspace emitter target interception has good performance. In the aspect of DBF and DOA estimation, this paper analyzes the digital monopulse measurement of angle and a simplified algorithm is given through linear guide angle curve fitting of digital sum-difference amplitude-algorithm. In the terms of radar signal sorting and emtter positioning, the simulation analysis of the dynamic correlation, histogram signal separation method and double direction emitter location algorithm are given. The optimum intersection angle condition is given on the minimum circular error probability criterion and an improvement CDIF algorithm is presented. Acorrding to the measured data, the performance of the data processing algorithm is given in the simulation. In the terms of the design of digital phased array multi-function passive detection system, the design of a typical system composition block diagram, passive detection signal processing system and collaborative passive direction detecting emitter positioning system are given. And the design of software scheme of a double collaborative detection system networking control and a double collaborative passive detection system data processing software are given.