摘要
宽带干扰是卫星导航系统中常见的一种压制性干扰,也是危害较大的一种干扰方式。针对线性调频宽带干扰,以离散傅里叶变换为信号分析工具,并在此基础上提出一种基于NEW-MDCFT的宽带干扰抑制算法。详细介绍了该算法的模型和实现方式,并针对叠加了线性调频宽带干扰信号的北斗系统B1信号,采用该算法进行计算机仿真,给出干扰抑制前后信号的时域性能、频域性能、捕获性能以及跟踪性能等特性。结果表明,基于NEW-MDCFT的抑制算法具有良好的线性调频宽带干扰抑制性能,可以使接收机在干扰环境下顺利完成捕获和跟踪,大大增强了卫星导航信号的抗干扰能力。
Wideband interference is common oppressive which impact on the receiver performance badly in the satellite navigation system.In this paper,aiming at the linear frequency modulation（LFM）wideband interference,an interference suppression method based on NEW-MDCFT is presented,and the model and implementation method of the suppression algorithm have been introduced.By adding the LFM jamming to the COMPASS B1 signal,the interference suppression method is simulated,and time domain performance,frequency domain performance,acquisition performance and tracking performance of the signal before and after interference suppression have been given.The results indicate that,the suppression method based on NEWMDCFT has good LFM interference suppression performance and is able to perform good interference suppression for seriouslyinterfered information navigation signal,so that the receiver can accomplish acquisition and tracking smoothly.
出处
《导航定位学报》
2015年第1期61-65,共5页
Journal of Navigation and Positioning
基金
国家自然科学基金(11203027)
