一种导航信号频域干扰抑制方法及其FPGA实现

针对双频导航接收机在导航战中面临的窄带干扰问题，提出了一种频域抑制压制式窄带干扰的方法，并把该方法应用在军用导航接收机中提高导航系统的抗干扰能力。介绍了基于快速傅里叶变换的干扰抑制算法，并对频域干扰抑制方法进行了加窗、混叠、数字自动增益控制处理等设计处理；考虑实际工程应用情况，在较小资源占用的前提下完成了现场可编程门阵列(Field Programmable Gate Array, FPGA)工程实现。将实现的频域抗窄带干扰工程移植到接收机基带中，完成了抗干扰试验，验证了其抗干扰性能，为导航接收机系统双频抗窄带干扰提供了理论和实际工程应用参考。

A frequency domain narrowband interference suppression method of navigation signal and its FPGA implementation

To solve the narrow band interference problem faced by dual-frequency navigation receivers in navigation warfare,a frequency domain suppression method for suppressing narrowband interference is proposed and applied in military navigation receivers to improve the anti-interference ability of the navigation system.The interference suppression algorithm based on the fast Fourier transform is introduced,and the processing such as windowing,aliasing,and digital automatic gain control is designed for the frequency domain interference suppression method.In consideration of the actual engineering application,field programmable gate array(FPGA) engineering application is realized on the premise of less resource occupation.The implemented frequency domain anti-narrowband interference project is transplanted to the receiver baseband and the anti-interference test is completed.The anti-interference performance is verified,which provides a theoretical and practical engineering application reference for the dual-frequency anti-narrowband interference of navigation receiver systems.