Abstract：Reliable detection and accurate measurement of low-angle targets are major challenges for ground-based air-defense radar. While the digitalization of ground-based information systems and phased array radar, exploiting environmental information as a priori and combining advanced models/algorithms brings the potential to improve. To that end, the paper established a structural model of the array receiving data by precisely formulating the propagation path of multipath echoes from low-angle targets using the digital elevation information provided by the Geographic Information System (GIS). With the aid of the spatial and intensity distribution of scatters, heuristic optimization was employed to optimize the side lobe of the beam pattern, which improved the signal-to-clutter/noise ratio and the detection probability of weak targets. In addition, to match with the structural model, the subspace-based estimator was modified, enabling accurate and super-resolution elevation estimation without pre-estimating the complex multipath factor. As verified by simulation results, the proposed model and method are available for ground-based radar to reliably detect and resolve multiple low-angle targets and give accurate elevation estimates.
赵春雷, 何民康, 赵婵娟, 叶舟, 范婉华. 基于数字地理信息的雷达低空目标检测估计模型与方法[J]. 空天防御, 2025, 8(1): 71-76.
ZHAO Chunlei, HE Minkang, ZHAO Chanjuan, YE Zhou, FAN Wanhua. Model and Method for Radar Detection and Estimation of Low-Angle Targets With the Aid of Digital Geographic Information. Air & Space Defense, 2025, 8(1): 71-76.
