单天线合成阵列欺骗式干扰抑制

摘要

Spoofing is hidden because its power level below noise floor and has the same format with authentic satellite signals in time-frequency domain,which brings a great threat to the security of satellite navigation systems.The multi-antenna technology has been proved to be a very effective method in spoofing suppression.However,the interference suppression performance of multi-antenna technology in practical application is limited by the channel errors and the array aperture.In this paper,Under the premise of unknown the DOA (Direction of arrival) of authentic satellite signals,a single moving sensor is used to construct a synthetic array,and,based on this synthetic array,a spoofing suppression method is proposed.The synthetic array receiving signal model is firstly constructed in the presence of spoofing.Then the MUSIC algorithm and RELAX algorithm are respectively used to estimate the DOA of spoofing sources.Finally,the adaptive weight vector of synthetic array is formed according to the estimated spoofing DOAs,which is used to suppress the spoofing.Simulation results prove the correctness and the effectiveness of the proposed method.%欺骗式干扰的功率远低于接收机噪声水平且与有用卫星信号在时频域都具有相同的信号形式,具有很强的隐蔽性,给卫星导航安全带来巨大威胁.多天线技术在欺骗式干扰抑制中已被证明是非常有效的方法,然而实际应用中多天线技术的干扰抑制性能受阵元通道误差和阵列孔径的影响.本文在真实卫星信号来向未知的前提下,给出了一种利用单天线运动形成合成阵列,进而进行欺骗式干扰抑制的方案,首先构造了合成阵列接收信号模型,然后分别利用MUSIC算法和RELAX算法估计出欺骗式干扰来向,最后通过估计出的欺骗式干扰来向得到合成阵列的自适应权向量,从而抑制欺骗式干扰.仿真实验验证了合成阵列抑制欺骗式干扰方案的有效性和正确性.