Technology Of Bistatic MIMO Radar Target Angle Measurement

Nowadays,bistatic radars and multiple-input multiple-output(MIMO)radars have received widespread attention.The bistatic radar has strong battlefield survivability due to the separation of transmission and reception parts.The MIMO radar can expand the array aperture due to the freedom of the waveform,and has higher angle measurement accuracy.The bistatic MIMO radar combining the bistatic system and MIMO technology has the advantages of both.This thesis focuses on the target angle measurement technology of bistatic MIMO radar.The research content and results can be divided into the following four parts:In the first part,based on the uniform linear array of the transmitting array and the receiving array,the orthogonal signal echo model is established,and the multi-beam spatial division of the bistatic MIMO radar and the subsequent two signal processing methods are studied according to the echo model.At the same time,the impact of multi-beam spatial division on signal processing is explored.In the second part,the existing bistatic MIMO radar angle estimation algorithm based on array element space is studied,and it is divided into traditional subspace algorithms,tensor decomposition algorithms and other algorithms to be introduced separately.In the third part,the angle estimation algorithm based on the beam space of the bistatic MIMO radar is researched.Firstly,the traditional bistatic MIMO radar angle estimation algorithm based on beam space is introduced,and then a beam space algorithm based on distance information is proposed by drawing on the dimensionality reduction scanning algorithm based on distance information.The proposed algorithm uses the distance information that is easily known in the actual radar system to establish the correspondence between the direction of arrival(DOA)and the direction of departure(DOD).Then,based on this relationship,the beam space matrix is designed and the DOA and DOD can be estimated.The algorithm has a good angle estimation performance while greatly reducing computational cost.In the fourth part,under the condition that the target is known in the approximated space,in order to avoid the waste of energy caused by the dispersion of the transmission energy of the traditional orthogonal waveform,an angle measurement algorithm based on the concentrated waveform of the transmission energy is proposed.The algorithm first establishes a data model based on the transmitted energy concentration waveform,and then uses the estimating signal parameters via rotational invariance techniques(ESPRIT)algorithm to estimate DOA and DOD,and finally establishes a noise-free model to correct the error of the DOD.Through simulation verification,the algorithm has better angle estimation performance than traditional algorithms.