Study On Low Interception And Anti-jamming Of Missile-borne MIMO Radar

MIMO radar is a multi-output-multi-output radar that can transmit orthogonal waveforms.This waveform diversity capability enables MIMO radars have significant advantages in low interception,anti-interference,anti-clutter,and target identification.The MIMO radar has been widely used in many fields such as ground-base,shipboard,and airborne platforms.Due to the high maneuverability of the missile-borne platform,complex trajectory and limited space resources,it is difficult to achieve engineering realization.Therefore,there is little research on MIMO radar technology used for the missile-borne platform.Based on the high-speed missile-borne platform,this thesis mainly focuses on the low interception and anti-jamming of MIMO radar: 1.The principle of MIMO radar and the orthogonal waveform design are analyzed,and a design method of orthogonal multi-phase coding based on sequential quadratic programming is proposed.Also,the design of orthogonal four phase with code length of 40 is completed.This method reduces the auto-correlation and cross-correlation of the signal compared with the genetic algorithm.The orthogonality among the waveforms is better,and the low radar interception performance is achieved.2.The adaptive beamforming technology is studied and combined with MIMO radar and sidelobe interference suppression is completed.In order to solve the problem that the classical MUSIC algorithm cannot accomplish the direction measurement of the coherent signal,combined forward sptial smoothing algorithm with backward sptial smoothing,a forward-backward spatial smoothing algorithm can be used to estimate the direction of arrival of the coherent signal source accurately,and the super-resolution direction measurement of the target can be achieved during the missile terminal guidance stage,and main-lobe anti-interference is realized.3.Because of the limitations of the traditional monopulse angle measurement technology,a new double-difference channel is added on the basis of the three-channel method to form four channels,this method overcomes the angle measurement in which the three channel method is unable to carry out the main lobe interference.And the four-channel method is used to perform the interference angle measurement analysis in the missile terminal guidance stage,which can solve the conventional problem that the three-channel method has high resource occupancy rate and low computational efficiency.It can also improve the accuracy of the angle measurement,and achieve suppression of the main-lobe interference.