| bistatic radar based on Geosynchronous orbit(GEO)has a unique status in the low altitude small targets detection and ground moving targets detection,because of its wide area of exposure,the long coherent accumulate time,not easy to be blocked by features and other advantages.A bistatic radar system based on GEO satellite transmitting and ground platform receiving is constructed in this thesis,long time coherent accumulate method for the air target detection,space-based bistatic radar clutter simulation and detect algorithm for ground motion target are carried out.The main research work is summarized as follows:Firstly,a new algorithm for airborne target detection based on GEO irradiation source is proposed.A bistatic radar moving target echo model of GEO satellite transmitting and ground platform receiving is built,based on it the cause of range migration and Doppler broadening in the long time coherent integration is analyzed,a kind of four-order Keystone transform detection algorithm based on aerial target is put.The algorithm derivation and the specific target detection process are given.The simulation results show the correctness and effectiveness of the proposed algorithm.Second,the bistatic radar clutter simulation based on GEO irradiation source is studied.One space-based bistatic radar geometric model of GEO satellite transmitting and clutter scattering model is established.The expression of the clutter equal distance ring is derived by coordinate transformation,distance interval and angle interval of the clutter scattering ceil grid divide were calculated;radar clutter sequence obeying the K distribution is simulated through the spherically invariant random process,characteristics of clutter is researched in the model of this thesis,the feasibility of the method for simulating clutter is verified by simulation experiments.Third,the ground moving target detection algorithm based on GEO irradiation source is studied.The mechanism of space-time adaptive processing(STAP)for clutter suppression is discussed,and the adaptive weight calculation is deduced.On the basis,a bistatic radar ground moving target echo model of GEO transmitting and ground platform receiving is built,achieves moving target detection under the clutter wave background through space-time adaptive processing,and the performance of clutter suppression is analyzed and the feasibility of ground moving target detection in GEO bistatic radar is verified by simulation. |
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