Research On Bistatic Radar Moving Target Energy Accumulation Methods

Compared with monostatic radar,bistatic radar has the capability of anti-disturbing and viability because its transmitter and receiver are placed on different platforms.It is widely used in military and civilian target detection field.However,with the improvement of maneuverability and stealth performance of observation objects,bistatic radar early warning system encounters great challenges.In order to improve the detection performance of radar system,it is necessary to accumulate the echo energy of moving target effectively.The unknown motion of the target leads to severe range and Doppler migration in the echoes,which generates unknown Doppler phase and complicates the energy accumulation process of the moving target.This thesis aims at the particular problems in different situations,which contains high echo signal-to-noise ratio,low echo signal-to-noise ratio and complex target motion.The main work of this thesis is as follows:1.The moving target incoherent accumulation method based on randomized Hough transform is proposed.The problem of unknown first-order and second-order migration correction of moving targets under high signal-to-noise ratio can be solved by this method.And the fast and effective accumulation of echo energy of moving targets is realized.2.The moving target coherent accumulation method based on delay correlation processing is proposed.Using second-order Keystone transform and delay correlation processing,the low signal-to-noise ratio echo cross-cell and Doppler parameter estimation problems are solved.And it can realize fast region search.3.The moving target coherent accumulation method based on symmetric Keystone transform is proposed.The problem of Doppler phase compensation for high-order migration correction of complex motion moving targets is solved.And it is able to achieve fast detection of unit-level targets.The above methods have been verified by theoretical deduction and numerical simulation,which effectively accumulate target energy in different motion states.