Research On The Method Of A Single-observer Passive Ranging And Locating

Active detection systems have encountered more and more threaten of anti-radiation technology in modern military affairs, but single-observer passive location and tracking system with simple structure has good hidden properties and long detection distance, because it does not radiate any electromagnetic waves and it avoids time synchronization between stations and complex data processing. Therefore, single-observer passive ranging and locating technology has great significance in enhancing the system's stability and battle effectiveness.Due to the slow speed and low accuracy in location of conventional single-observer passive locating method, in addition, corresponding locating precision is sensitive to measurement errors, which puts forward high demands on measurement equipment impersonally, and it has been proved to meet the requirements of tactics hardly. Consequently, it is urgent to improve the accuracy and shorten the time for single-observer passive locating.Single-observer passive locating and relative technology are studied exploratory in this paper including location and tracking. Then the simulation experiment is carried on with developed single-observer passive locating prototype machine on the base of theoretical study, and the results show that the method has engineering feasibility. This paper concentrated on the research works listed below and achieved some creative results:(1) The theory principle of single-observer passive locating technology and conventional single-observer passive locating methods are systematic explained, compared and analyzed.(2) On the basis of the locating method based on Doppler changing rate, three different tracking algorithms for single-observer passive locating are introduced. Then IEKF and MVEKF algorithms are present against the defect of traditional EKF. Because the amount of calculation of the MVEKF algorithm is smaller and less influence on initial value, and it not only ensures the convergence speed, but also can get better filter effect, for those reasons, this paper adopted MVEKF as locating and tracking algorithm on the follow-up research.(3) According to particle kinematics, precise estimation of Doppler changing rate is one of key technology of single-observer passive locating and studied in detail in the this paper. Then the signal models of coherent pulse signal, phase encoding pulse signal and chirp signal are built and analyzed, for which a coherent integration algorithm is added and MVEKF algorithm is introduced to the existing algorithm of Doppler changing rate, improving signal-to-noise ratio and Doppler changing rate estimating accuracy.(4) The structure and locating process of single-observer passive locating prototype machine is briefly introduced in this paper. This paper simulated pulse Doppler signal, conventional pulse signal and other common radar signals, and use them to experiment respectively. The computer results show that the single-observer passive ranging method based on Doppler changing rate combined with MVEKF can achieve rapid high-precision locating and tracking, and it has certain engineering practical applicability.