Research On Radar Coincidence Imaging With Array Position Error

Radar coincidence imaging(RCI),motivated by the optical coincidence imaging,is based on the innovative idea of super-resolution imaging based on wavefront modulation.RCI can be realized by a radar array configuration to transmit specific modulated waveforms,thus a diverse scattering field is formed in the imaging scene.Finally,the diversity of signals reflected by different targets can be utilized to image the target.Compared with conventional radar,RCI is a high-resolution staring imaging technique without the limitation of the relative motion between radar and target.The reference signals should be deduced exactly for RCI,whereas the generally existing modeling error(e.g.,array error,grid mismatch)would induce the deducing error of referencing signals which degrade the imaging performance.This paper focuses on the array position error in RCI,which commonly exists in array radar.The main content is listed as follows:Chapter 1 is the introduction.First,the basis characters of conventional radar are summarized;the bottlenecks which limit its developments are also indicated.Then,the technical background and development of RCI are introduced.Also,its characters and potentials are pointed out.Finally,the array position error is generally existent,and the basic means for it are summarized.Chapter 2 describes the theory of RCI.First,the two essential factors of RCI are clarified from the perspectives of stochastic radiation field and correlation processing,then the mathematical model is obtained.Second,three basic algorithms are presented and analyzed using numerical simulations.In addition,the practical problems for RCI application are pointed out.The array position array is analyzed in Chapter 3.The effect of array position error on imaging is simulated.Moreover,the RCI model with array position error is derived.Finally,how the array position error impacts the RCI are analyzed by numerical simulations and Cramer-Rao lower bound(CRLB).The calibration and compensation methods for array position error are focused on Chapter 4.On the one hand,a calibration method with instrumental targets is proposed first,its validity are verified,while its robustness to noise is depressed.On the other hand,the iterative compensation and equivalent compensation are proposed.For the two methods,the effectiveness is verified,the performance is analyzed,and the essential characters are summarized.Finally,we carried on summary and outlook to the full text.The main innovative contributions of this dissertation are concluded,as well as the next step of the study and the development of RCI has been presented and discussed.