Phased Array Radar Low-altitude Target Detection And Tracking Technology

Sponsored by DMC-radar applied in a Navy range, this dissertation focus on the low-altitude/low-angle radar target detection & tracking techniques. It contains four parts:In the first part, the models of sea-clutter and multipath propagation are studied, which affect the radar's detectability and tracking ability of low-altitude target seriously. Through the analysis of the test data and the new development in the relevant literature, some more realistic models for sea-clutter and multipath propagation is concluded and the simulation is accomplished in the software. They provide the foundation for low-altitude radar target detection & tracking techniques research.In the second part, radar low-altitude target detection & parameters(elevation-azimuth-range delay-Doppler shift) measure are studied. It includes: target detection under sea-clutter and multipath propagation, multipath effects on parameters measure of target, analysis and comparsion of all multipath reduction techniques' performance.The third part pay more attention to elevation tracking with monopulse radar while the target is in the horizon region. Multipath propagation seriously degrades the performance of elevation tracking and makes the radar unable to work properly. Based on the research of the Complex angle and the bias compensation techniques, the dynamic compenstion with relative phase is developped for elevation tracking & measure with the amplitude-comparison monopulse radars, and it is proved to be a optimum technique by thoery and simulations.In the fourth part, the tracking filter for low-altitude radar target is studied. It consists of the coordinates setup and transform of the phased array radar, some filter parameters' design for low-altitude target, EVIM technique used in the low-altitude radar target tracking, the strategy for low-altitude radar target tracking, etc.