基于频域幅值处理的扩频接收机抗干扰技术

Anti-interference of Spread-spectrum Receiver Based on FADP Technique

针对扩频导航系统面临的窄带干扰问题,提出了基于频域幅值处理(Frequency Amplitude Domain Processing,FADP)技术的抗干扰方法,并把该方法应用在扩频导航接收机中,提高导航系统的抗干扰能力。FADP是根据统计判决理论,利用局部最优检测思想得到了一个非线性函数,通过这个非线性函数对干扰进行抑制。把FADP应用在常规平方和伪码捕获结构中,能够根据非高斯干扰的统计特性来消除干扰以提高扩频系统信噪比。仿真结果表明,该抗干扰处理结构能够自适应地有效抑制扩频导航接收机中的窄带干扰,提高扩频系统的检测性能。

The main objective of this paper is to describe and simulate the application of an interference canceling technique named Frequency Domain Amplitude Processing(FADP)in navigation and improve anti-jamming capability of the navigation system.FADP means use of the local optimal detection ideas to obtain a nonlinear function on the basis of statistical theory,and the interference is restrained through the nonlinear function.FADP is applied to the conventional square code acquisition structure,and it can eliminate interferences to improve the signal to noise ratio of the spread-spectrum system according to the statistical characteristics of the non-gauss interferences.Simulation results show that the proposed anti-interference structure can adaptively suppress the narrow band interference and improve the detection performance of spread-spectrum navigation system.