Design And Analysis Of The MIMO Radar GMTI Modes

Ground moving target indication(GMTI) is widely applied in military and civil fields. Multiple-input multiple-output(MIMO) radar offers a new method for signal processing research. MIMO radar possesses significant potentials for enhancing resolution, and suppressing interference. Fully utilizing these potentials can achieve significantly improved performance of parameter estimation, moving target detection, moving target recognition and tracking. Applying MIMO radar into GMTI has many advantages: with the comprehensive applications of Multiple-antenna, multiple-waveform, multiple-frequency and multiple-channel, more equivalent phase centers are formed with a smaller number of antenna arrays, and more system freedoms can be provided. Therefore, angle estimation precision and target detection performance are improved, clutter suppression capability is enhanced, and system anti-jamming capability is raised. Modes design of the MIMO radar GMTI with full utilizing the advantages of MIMO radar becomes the hot topic. In the dissertation, the modes design of MIMO radar GMTI, their preferences analyses and simulation verifications are addressed. The main contents are:Chapter 1 introduces the research background and significance of MIMO radar GMTI, and summarizes the status of MIMO radars and GMTI methods. Finally, the main work is presented.Chapter 2 depicts the principle of Space-Time Adaptive Processing. The STAP data model is built, and STAP filter weighted values are derived. This established the base of Space-Time-Frequency Adaptive Processing(STFAP), performance analysis and the simulation of signal level.Chapter 3 designs the modes of MIMO radar GMTI based on the multiple subband signals and the spatiotemporally nonseparable multidimensional waveform encoding technology. Multi-subband modes are designed based on the transmitting and receiving ways. Different modes have different antenna powers, swaths and equivalent phase centers. Blind velocity can be inhibited with multiple subbands. With digital beam forming(DBF) techniques and spatiotemporally nonseparable multidimensional waveform encoding principle, two GMTI modes are designed. Beam dwelling time is increased through scanning in pulse, and coherent processing interval numbers is increased. More equivalent phase centers and more flexible and more efficient baselines can formed which can achieve better performance of clutter suppression.Chapter 4 deduces the optimal STFAP weighted values. The performance analyses of MIMO radar GMTI are introduced. The performances of improved factor, output SCNR and detection probability are simulated.Chapter 5 builds the GMTI signal model which is applied into two designed modes above. Simulation results proved that the designed modes are reasonable.Chapter 6 summarizes the main work in this dissertation, and the future work is discussed based on the research of current development and the pressing demands of the practical application.