自适应天线调零是GPS接收机最主要的抗干扰措施之一。为了迫使自适应调零“失效”,在分析GPS接收机采取功率倒置(powerinverse,PI)算法进行自适应调零适用性的基础上,针对PI算法在实现时所需的先验信息相对较少、收敛速度相对较慢以及在低干噪比(jamming-to-noiseratio,JNR)下产生零陷角域相对较宽的特点,提出了强干扰“掩护”下的弱干扰进入、强干扰同步开关下的弱干扰间隙“填充”以及干扰俯仰方向逼近等对抗方法。通过仿真分析验证了对抗方法的可行性和有效性。

Adaptive nulling technology is one of main anti-jamming measures adopted by GPS receiver.In order to force adaptive nulling invalidation, on the basis of analysis of PI algorithm applicability for adaptive nulling of GPS receiver, in view of the characteristics of PI algorithm including less prior information required, slower convergence rate and wider nulling angular region at low JNR, countermeasure scheme proposed is that weak jamming entrance covered by strong jamming, weak jamming clearance filled under strong jamming synchronous on-off and jamming pitch direction approximation.Simulation results validate feasibility and effectiveness of the proposed countermeasure scheme.