摘要
研究了分数阶傅里叶变换(Fractional Fourier Transform,FRFT)抗线性调频(Linear Frequency Modulation,LFM)干扰技术,提出了一种基于FRFT域幅度一阶矩的逐精度求取最佳变换阶次的方法,并针对连续LFM干扰提出了一种求取最佳变换阶次的策略。同时针对全球导航卫星系统(Global Navigation Satellite System,GNSS)中的LFM干扰,对信号的预处理、阈值的自适应选取做了研究与分析,给出了相应的处理方法。仿真结果表明,该方法能够减少抗连续LFM干扰时求取最佳变换阶次的计算量,而且可以有效抑制GNSS接收机中的LFM干扰。
The linear frequency modulation （I.FM） interference suppression technology based on the fractional Fourier transform （FRFT） is studied and a method of calculating the optimal trans formation order of transformation by progressive grade of precision based on the first order mo ment of the amplitude in the FRFT domain is proposed in this paper. At the same time, for the continuous LFM interference, a strategy of calculating the optimal transformation order of FRFT is proposed. In addition, for the LFM interference in GNSS receiver, signal preprocessing and a daptive threshold selection are studied and analyzed, and corresponding solutions are presented. The simulation results show that the method proposed in this paper can effectively reduce the cal culation amount of suppress the I.FM getting the optimal nterference in GNSS transformation order of continuous LFM interference and receiver efficiently.
作者
席闯
常青
李舸争
王昊
XI Chuang;CHANG Qing;LI Gc zhcng;WANG Hao(BciHang University,Bcijing 100191,China)
出处
《导航定位与授时》
2018年第5期54-60,共7页
Navigation Positioning and Timing
基金
国家自然科学基金(61471021)
