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为了进行空时自适应地杂波抑制,分析研究了天基双基地预警雷达系统中的空间几何向量关系,建立了由相对运动产生的地杂波单程多普勒频率计算模型,通过具体配置分别调用得到了基于B-SBR和HB-SBR配置的地杂波多普勒频率特性。然后以星载平台为例,计算分析了地球自转运动对地杂波多普勒频率的影响,提出了以升交点升角分析偏航角、偏航量和偏航差的方法,并对频率特性进行了仿真,仿真结果表明,这一方法使地杂波多普勒频率受地球自转运动的影响得到全部趋势而非局部的反映。
In order to carry out space-time adaptive clutter suppression, the space geometry vector relations in the space-based bistatic early-warning radar system are analyzed and established, and a single-pass Doppler frequency calculation model of ground clutter generated by relative motion is established. The clutter Doppler frequency characteristics based on B-SBR and HB-SBR configurations were obtained. Then, taking the satellite platform as an example, the influence of earth rotation motion on the ground clutter Doppler frequency is calculated and analyzed. A method to analyze the yaw angle, yaw rate and yaw difference with ascending angle is proposed. The frequency characteristics The simulation results show that this method can make the clutter Doppler frequency to be the whole trend rather than the local reflection under the influence of the Earth’s rotation motion.