基于STAP杂波抑制的天基雷达PRF设计

摘要

提出了一种基于空时二维自适应处理(STAP)杂波抑制技术的天基雷达脉冲重复频率(PRF)设计方法.该方法首先通过几何建模对主杂波缺口宽度进行估算、确定适用于整个搜索空域的脉冲宽度参数,然后通过杂波仿真获得最优STAP处理的最小可检测速度(MDV)指标、并用经典M/N中等PRF选择法设计一组PRF波形,最后画出距离-速度盲区图进行验证.文中推导了公式,用设计实例验证了该方法的有效性.仿真表明,在PRF设计中采用未补偿的主杂波缺口宽度参数在工程实际中可以获得更好的距离-速度覆盖性能.%In this paper, a pulse repetition frequency(PRF) design procedure with space-time adaptive processing(STAP) for space-based radar(SBR) is proposed. Firstly, the main clutter notch width is coarsely calculated by geometric modeling, and then the pulse width parameters for the whole search volume are determined. Secondly, a more accurate calculation of minimum detectable velocity(MDV) for optimum STAP is performed by clutter simulation, and the classic M/N medium PRF selection method is used to design a set of staggered PRFs. Lastly, the range-velocity blind map is plotted to verify the set of PRFs. Formulas are derived in the text, and a design example is presented to prove the validity of the new procedure. The simulation suggests that using the main clutter notch width parameter without any compensation in the PRF design would achieve better range-velocity coverage in the engineering practice.