Short Range Imaging Algorithm Of Millimeter Wave MIMO Radar

In recent years,the activities of terrorists have become more frequent,and public places have become their first target,so the safety inspection of the human body and luggage is essential.The millimeter wave band is located between the microwave and the far infrared wave,so it can penetrate the coverings such as clothes and detect and image the hidden objects of the human body.In addition,the non-ionizing nature is more secure for the health of the tested personnel and staff.The above advantages of millimeter wave make its imaging technology have broad application prospects in the field of civil security.However,most of the security inspection equipment on the market have many disadvantages such as more antenna elements,large equipment and long imaging time.Therefore,the security equipment with high security and low cost has important theoretical significance and application value in the security field.MIMO radar can use the related technology to obtain observation channels far larger than the actual number of physical array elements,thus reducing the number of array elements,reducing system cost,and providing a possibility for quasi-real-time imaging.This thesis takes the millimeter wave radar security rapid imaging system project and the millimeter wave MIMO radar imaging algorithm as the research background.Based on the in-depth study of short-range millimeter-wave planar synthetic aperture imaging with single-shot and single-receiving mechanism,the planar synthetic aperture imaging algorithm is further improved,and the short-range millimeter-wave imaging technology and array design under MIMO transceiving mechanism are studied.The main research work of the full text is divided into the following three parts: planar scanning imaging algorithm,planar scanning rapid imaging algorithm,MIMO radar antenna array design and corresponding imaging algorithm.Firstly,around the engineering realization of millimeter wave imaging algorithm,the systematic basic structure and principle,such as synthetic aperture radar imaging and millimeter wave imaging system front-end,and the technology of MIMO antenna array design applied to millimeter wave imaging system are given.Secondly,based on the model and principle of the millimeter wave plane scanning imaging system in the traditional mode,the backward projection algorithm and the distance migration algorithm are analyzed and simulated,and the effectiveness of thealgorithm is verified.On this basis,the imaging time is optimized from both the algorithm and the hardware platform,which shortens the imaging time by nearly 10 times.Finally,the MIMO array is introduced for the shortcomings of the antenna elements of the planar scanning radar imaging system.However,the complexity of the MIMO array structure makes it difficult to directly apply the planar scan correlation algorithm to MIMO radar imaging.Therefore,the equivalent phase center principle is used to further study the system model and imaging principle of the equivalent algorithm of the wavenumber domain of millimeter wave MIMO radar imaging.Simulations are used to validate their effectiveness and feasibility.