Automatic Detection And Recognition Of Ground-based Radar Station For Active Radar Seeker

The new anti-radiation missile using active-passive multi-mode compound guidance technology can greatly raise its ability to resist the powerful jamming such as shutting down of the objective radar and to select the right target, compared with the missile that only has the passive seeker. It's the critical technology to raise the operation efficacy of the missile that detection and recognition to the ground-based radar station using an active radar seeker.First of all, the technology of detection and recognition to the guiding radar of air defense missile weapon system (ADMWS) using an active radar seeker is reviewed, and the key techniques as well as the major work are also specified. Then the electromagnetic scattering characteristics of radar antenna, the algorithm for detecting radar antenna in strong ground clutter background and the target recognition technology are comparatively systematically studied from the three aspects of the target specific property, detection and recognition.In accordance with the demands for detection and recognition, the analysis methods of revolving paraboloid reflector antenna and planar slotted array antenna are stressly studied based on the theory of the antennal electromagnetic scattering mechanism. Then the influence on the antennal RCS of factors such as the antennal size, frequency and quantity of slots etc are detailedly discussed, and the recognition characteristics of the ground-based radar station are also analyzed.In accordance with the difficulty in detecting ground targets in strong ground clutter background, Doppler Beam Sharpening (DBS) technology is adopted to raise the resolving ability of the radar seeker, and by way of subdividing the resolving cell to raise SCR, in order to raise the detection performance of seeker. Firstly, the ground clutter property of air-to-ground radar is analyzed, and then the basic theory of DBS imaging is introduced. The critical technology of DBS imaging under scanning mode is stressly studied, and put forward the way of carrying on the sequential scanning imaging to the target sector, using serial imagines to estimate targets' RCS in order to recognition.Based on the extracted features of the radar antenna and estimation results of RCS, the target identification technology of active radar target seeker is studied. The frame of recognition algorithms for ground-based radar station is given out, and four kinds of characteristics of phased-array radar antenna are constituted. Finally the recognition algorithms as well as the fusion technique for target recognition are put forward.The final part deals with the detection technology of ground-based radar station based on one dimension high resolution range profile (HRRP). The analysis has been done to the high resolution scattering property of the phased-array radar antenna, and the equivalent scattering centers of flat board and slotted array are extracted. Then the paper presents the math model of echo signal from an extended target for a Stepped Chirp Radar, and introduces the principle of synthesizing a HRRP of an extended target by phase coherent integration, and uses this technology in the image of antenna objective. Based on the HRRP of antenna, the adaptive single-scan radial integrated (ASSRI) and continuous sweep periods radial integrated (CSPRI) detection algorithms are studied. The optimum detector is derived, and the performance of the detector is analyzed.In this dissertation, we conduct an explorative research on the technology of detection and recognition to the ground-based radar station using an active radar seeker, and it will provide technology supports for the development to the new generation of anti-radiation missile and the reconstruction of some existing weapons.