GNSS多波束抗干扰接收机的反欺骗性能分析

为分析存在欺骗干扰的场景下GNSS多波束抗干扰接收机的反欺骗性能,提出欺骗抑制比这一性能指标。推导了在快拍数有限的情况下,多波束抗干扰接收机采用最小方差无失真响应(minimum variance distortionless response,MVDR)算法处理后输出真实信号和欺骗信号功率的理论公式。详细分析了欺骗信号到达天线阵口面的功率对真实信号和欺骗信号输出功率的影响。分析得出:即使欺骗信号功率在噪声水平之下,使用MVDR算法的多波束抗干扰接收机依然能对欺骗干扰进行抑制,且在欺骗信噪比高时,抑制效果更加显著。通过仿真和硬件平台实测验证了结论的正确性。

Analysis of anti-spoofing performance of GNSS multi-beam anti-jamming receiver

In order to analyze the anti-spoofing performance of the GNSS multi-beam anti-jamming receiver under spoofing interference scenario, a performance metric named deception suppression ratio was put forward. The theoretical formula for the power of the authentic and spoofed signal was deduced considering the anti-jamming receiver using the MVDR (minimum variance distortionless response) algorithm with limited number of snapshots. And the influence of the power of the spoofed signal arriving at the antenna array on the output power of the authentic and spoofed signal was analyzed in detail. The analysis shows that even if the power of the spoofed signal is below the noise level, the multi-beam anti-jamming receiver using the MVDR algorithm can still suppress the spoofing interference. And when the spoofed signal-to-noise ratio is high, the suppression is more effective. The conclusion was verified by simulation and hardware platform test.