Observability Analysis And Positioning Algorithm Based On The Doppler Frequency

The forward development of the radar history promotes the return of the bistatic form. And the growing requirement of the scientific community in new century accelerates the improvement of the radar location system. This dissertation bases on Bi/Multi-static, locating a moving target from noise corrupted Doppler frequency measurements obtained by two or more cooperative or non-cooperative distributed transmitters networked together with their receivers combine at a central location( T~i/R, i ≥ 2). Both the observability requirements in two dimensions and the expressions for the Cramer-Rao bound for two or more transmitters are derived. The numerical algorithm of the T~2/R radar is also presented in 2-dimension. Finally we get some interesting and meaningful conclusions that the radars can exploit excellent information of Doppler frequency to provide a resolution comparable to conventional radars, and which also provide many important technical insights.Some major points of the dissertation include that:The model of bi/multi-static radar is analyzed, and the measurement equation of Doppler frequency is also formulated, respectively.The observability requirements are presented and discussed, and the Cramer-Rao bound is also derived, by a tedious mathematical analysis. This section is the theoretical footstone of the whole system.Simulation results have achieved in two typical scenarios, including the geometric dilution of precision (GDOP) figures and the target location error statistical tables which indeed support our system is excellent and flexible.Maximum Likelihood estimation is proposed to accomplish target state estimation about the system. A numerical algorithm is introduced bases on Evolution Algorithm (EA) strategy using Grid Search (GS) method.Finally, some conclusions, which are just the personal advices or the problem we encountered, have been obtained.