摘要
基于北斗接收机的频域窄带干扰抑制原理,首先分析了北斗导航信号加窗造成的信噪比损失。然后详细阐述了反加窗算法和重叠组合算法(重叠组合分为重叠选择和重叠相加两种方法),并给出了基于反加窗和重叠组合算法的窄带干扰抑制原理。理论分析表明,重叠选择比重叠相加算法的计算量小,同时,反加窗算法不限制窗函数类型和重叠组合方式,即在对北斗导航信号反加窗后,窗函数组合方式无论是重叠选择或是重叠相加,都能够快速的恢复原导航信号。因此,相比重叠相加与反加窗的组合方式,最后提出了使用计算量较小的重叠选择与反加窗的组合方式抑制窄带干扰。
Based on the theory of interference suppression in BDS receiver, firstly, the signal noise ratio（SNR） loss caused by BDS signal adding window function is analyzed in this paper. Then the method of inverse windowing and overlap-com-bination （overlap-combination includes overlap-select and overlap-add） are elaborated, and the theory of interference suppres-sion based on inverse windowing and overlap-combination algorithm is illustrated. The result shows that overlap-select algorithm has smaller calculation amount than overlap-add algorithm, at the same time, inverse windowing algorithm has no limit to window functions and the method of overlap-combination, wtich is to say, no matter which overlap-select and overlap-add to choose, inverse windowing can restore the original navigation signals rapidly. Therefore, compared with the method of antiwindowed combined with overlap-add, the method of anti-windowed algorithm combined with overlap-select algorithm which has smaller calculation amount is proposed in this paper.
出处
《导航定位学报》
2014年第2期93-96,112,共5页
Journal of Navigation and Positioning
基金
国家青年自然科学基金资助项目(61201199)
关键词
抗窄带干扰
快速傅里叶变换
加窗
重叠组合
narrowband interference suppression
FFT, windowing technology
overlapping combinations
