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第九届中国卫星导航学术年会

作者： Zukun Lu Zhengrong Li shaojie ni Baiyu Li Gang Ou College of Electronic Science National University of Defense Technology

The time domain and frequency domain anti-jamming technology based on single antenna,and the space domain anti-jamming technology based on antenna arrays,which can realize the interference suppression under the different interference *** interference intermodulation would be generated in single antenna and antenna arrays,and the most obvious is the third-order *** essence of interference suppression is to zero the interference spectrum in single antenna *** the third-order intermodulation is submerged under the noise,the intermodulation has little effect on frequency domain ***,in the application of antenna arrays anti-jamming,the nature of anti-jamming is to achieve interference cancellation by amplitude and phase weighting,and the consistency between different elements are *** the non-linear characteristics are the same in different elements,the third-order intermodulation can still be achieve cancellation through the amplitude and phase ***,in antenna array,the anti-jamming performance is not affected by third-order intermodulation on single channel but the non-linear *** this paper,the difference effects on single antenna and antenna arrays of the third order intermodulation are *** to the relationship between interference and intermodulation,a part of the third-order intermodulation could be suppressed,and the suppression method is *** simulation results show that the effectiveness of the analysis and the proposed method.

关键词： Time and frequency domain Antenna array Anti-jamming Third-order intermodulation Satellite navigation system

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GNSS/INS超紧组合导航综述

国防科技大学学报 2023年第5期45卷 48-59页

作者：倪少杰李诗扬谢郁辰邓丁国防科技大学电子科学学院湖南长沙410073

卫星/惯性超紧组合导航系统以其定位精度高、动态性能优良、抗干扰能力强等特性成为组合导航领域的研究热点。介绍了卫星/惯性超紧组合的定位原理,基于对技术原理的分析,比较超紧组合模式相对于其他组合模式的优势特点;以高动态下超紧... 详细信息

卫星/惯性超紧组合导航系统以其定位精度高、动态性能优良、抗干扰能力强等特性成为组合导航领域的研究热点。介绍了卫星/惯性超紧组合的定位原理,基于对技术原理的分析,比较超紧组合模式相对于其他组合模式的优势特点;以高动态下超紧组合技术及卫星/微惯性单元超紧组合为代表介绍国内外研究现状;总结了亟待研究的容错控制技术、神经网络辅助、多传感器辅助超紧组合等关键技术,并对卫星/惯性超紧组合向着低成本、高精度、强稳定趋势发展的前景进行展望。

关键词：超紧组合深组合全球导航卫星系统惯性导航系统

Analysis of anti-repeater-spoofing performance of GNSS nulling anti-jamming receiver

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Analysis of anti-repeater-spoofing performance of GNSS nulli...

第十四届中国卫星导航年会

作者： Binbin Ren shaojie ni Feiqiang Chen Zukun Lu Yifan Sun National University of Defense Technology

To analyze the anti-spoofing performance of the adaptive nulling anti-jamming satellite navigation receiver in response to direct repeater spoofing,this paper deduces the theoretical formulas of the output real signal and the direct repeater spoofing signal power after the Power Inversion(PI) algorithm processing,when the number of snapshots is *** influence of the power of the spoofing signal reaching the surface of the antenna array on the output power of the real signal and the spoofing signal is analyzed in *** analysis shows that no matter how the power of the direct repeater spoofing signal is set,the nulling anti-jamming receivers can always suppress it below the true signal power level,when the spoofing signals come in from one ***,using the antenna array software receiver for simulation,the conclusion is validated according to the capture code phase and carrier-to-noise ratio.

关键词：

Tracking Bias of Navigation Signal on Performance of Post-correlation MMSE Antijamming Algorithm

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Tracking Bias of Navigation Signal on Performance of Post-co...

Research on Spoofing Detection based on C/N0 measurements for GNSS array receivers

第十一届中国卫星导航年会

作者： Feiqiang Chen Zukun Lu Zhe Liu Long Huang shaojie ni National University of Defense Technology

For Global Navigation Satellite Systems(GNSS) receivers, antenna array technique is one of the most effective methods for interference mitigation. Among which, minimum mean square error(MMSE) techniqu

关键词： Satellite navigation adaptive antenna arrays beamforming minimum mean square error tracking

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Research on Spoofing Detection based on C/N0 measurements fo...

第十四届中国卫星导航年会

作者： Jinyuan Liu Yuchen Xie Feiqiang Chen shaojie ni Guangfu Sun College of Electronic Science and Engineering National University of Defense Technology

In recent years,Global Navigation Satellite System(GNSS) spoofing detection techniques have attracted wide *** with jamming,spoofing which always hides in the shadows has stronger concealment leading to more threat to the security of ***-to-noise ratio(C/N) is one of the important measurements of *** may cause abnormal changes in the C/N,but the variations of the C/N are not obvious in most cases,and it is liable to cause false alarm in the presence of *** on antenna arrays,this paper theoretically derives the effective C/N model of array receivers as spoofing successfully or unsuccessfully captures tracking *** we demonstrate that the C/N single difference(CSD) between satellites can be the testing statistic for spoofing *** results show that the proposed method can detect the abnormal C/N features of counterfeit signals after anti-jamming for the antenna *** method does not require modifications to the hardware configuration of conventional receivers and can provide an effective defense for array receiver in the combination of jamming and spoofing attacks.

关键词：

信道带宽对码相关参考波形算法码跟踪精度的影响

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国防科技大学学报 2016年第5期38卷 154-157页

作者：庞晶倪少杰刘瀛翔欧钢国防科技大学电子科学与工程学院湖南长沙410073

相关文献对码相关参考波形算法码跟踪精度的研究,主要是针对无限信道带宽条件下,仿真分析闸宽参数对码跟踪精度的影响,并未分析信道带宽影响。因此,推导了码相关参考波形算法码跟踪精度表达式,分析信道带宽对码相关参考波形算法跟踪精... 详细信息

相关文献对码相关参考波形算法码跟踪精度的研究,主要是针对无限信道带宽条件下,仿真分析闸宽参数对码跟踪精度的影响,并未分析信道带宽影响。因此,推导了码相关参考波形算法码跟踪精度表达式,分析信道带宽对码相关参考波形算法跟踪精度的影响并进行仿真验证。结论表明,在无限带宽下,减小闸波宽度可提高码跟踪精度,但是在带限条件下,闸波宽度存在最优值。该结论可用于指导卫星导航接收机的码相关参考波形算法设计。

关键词：卫星导航多径码相关参考波形算法码跟踪精度

A novel unambiguous W2 CCRW multipath mitigation algorithm applied to BOC（n, n） signals

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A novel unambiguous W2 CCRW multipath mitigation algorithm a...

第七届中国卫星导航学术年会

作者： shaojie ni Jing Pang Kai Zhang Chengtao Xu Zhe Liu Feixue Wang National University of Defense Technology

In this paper, a novel unambiguous W2 CCRW multipath mitigation algorithm is applied to BOC（n, n） signals. We investigate a novel BOC（n, n） ambiguous tracking method with W2 CCRW（Code Correlation Reference Waveform） multipath mitigation algorithm. It is easily applied only by adding a rectangular gate function with no loss for the multipath mitigation performance.

关键词： GNSS receiver W2 CCRW BOC(n,n) Multipath mitigation

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GPS L1C信号LDPC译码器设计

国防科技大学学报 2013年第1期35卷 65-69页

作者：王建辉李井源倪少杰欧钢国防科技大学电子科学与工程学院湖南长沙410073

GPS现代化中的L1C信号使用了LDPC码,以提高接收机的弱信号接收能力。L1C信号中使用的LDPC码没有循环或准循环结构,这为译码器设计带来了难度。为了降低译码器实现复杂度,在分析L1C信号LDPC码校验矩阵结构的基础上,通过对校验节点分类和... 详细信息

GPS现代化中的L1C信号使用了LDPC码,以提高接收机的弱信号接收能力。L1C信号中使用的LDPC码没有循环或准循环结构,这为译码器设计带来了难度。为了降低译码器实现复杂度,在分析L1C信号LDPC码校验矩阵结构的基础上,通过对校验节点分类和改变变量节点更新方法,提出了一种低存储量和简化译码器控制逻辑的低复杂度译码器结构,并通过仿真验证了译码器译码结果的正确性。

关键词： GPS L1C信号 LDPC码低复杂度译码器

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北斗卫星伪距信号质量评估及偏差校正

国防科技大学学报 2017年第4期39卷 87-91页

作者：倪少杰王耀鼎封欣王飞雪国防科技大学电子科学与工程学院湖南长沙410073 中国卫星导航定位应用管理中心北京100088

针对北斗卫星信号存在系统性伪距偏差的问题,从多路径角度评估北斗三频信号的质量,验证了该项偏差与卫星轨道类型、卫星仰角及信号频率有关。为消除这一系统性偏差的影响,采用连续分段线性函数建立北斗三频伪距偏差校正模型。与现有的... 详细信息

针对北斗卫星信号存在系统性伪距偏差的问题,从多路径角度评估北斗三频信号的质量,验证了该项偏差与卫星轨道类型、卫星仰角及信号频率有关。为消除这一系统性偏差的影响,采用连续分段线性函数建立北斗三频伪距偏差校正模型。与现有的改正模型所不同,所提模型不仅采用了更长时间范围内的北斗实测数据,更为重要的是它顾及了改正数的精度信息。基于动态精密单点定位的实验结果表明,采用所提方法修正后,接收机定位性能有明显提升。

关键词：北斗卫星导航系统伪距偏差多路径随机模型精密单点定位