由于GPS信号的低能级特性,在有些应用场合GPS接收机需采取抗干扰措施。在均匀线性天线阵条件下,文中采用MUSIC算法对干扰进行了抵消,并进行GPS信号捕获的仿真。仿真实验表明,多重信号分类法(MUSIC)对于大干扰噪声比(J/N)的干扰具有较高的到达角度(DOA)估计精度和信号噪声分离度。当GPS信号和干扰信号的DOA相差一定角度时MUSIC算法能够提高GPS接收机的抗干扰性能。

Anti-jamming methods should be applied to GPS receivers in certain situation due to the low power characteristic of GPS signal. Interference was mitigated by MUSIC algorithm applied to a uniform linear array in this paper, and a simulation on capturing GPS signal was also completed. The result shows that the MUSIC algorithm is competent for high precision DOA estimation of jammer and separating signals and noises with large J/N ratio. The anti-jamming performance of GPS receiver is improved when DOAs of GPS signals and interferences differ beyond a certain degree.