检索结果-南通市图书馆

Improved adaptively robust estimation algorithm for GNSS spoofer considering continuous observation error

Journal of Systems Engineering and Electronics 2022年第5期33卷 1237-1248页

作者： gao yangjun LI Guangyun LYU Zhiwei ZHANG Lundong LI Zhongpan Institute of Geospatial Information PLA Strategic Support Force Information Engineering UniversityZhengzhou 450001China State Key Laboratory of Geo-Information Engineering Xi’an 710000China Unit 96944 of the PLA Beijing 100000China

Once the spoofer has controlled the navigation sys-tem of unmanned aerial vehicle(UAV),it is hard to effectively control the error convergence to meet the threshold condition only by adjusting parameters of estimation if estimation of the spoofer on UAV has continuous observation *** at this problem,the influence of the spoofer’s state estimation error on spoofing effect and error convergence conditions is theoretically analyzed,and an improved adaptively robust estimation algo-rithm suitable for steady-state linear quadratic estimator is *** enables the spoofer’s estimator to reliably estimate UAV status in real time,improves the robustness of the estima-tor in responding to observation errors,and accelerates the con-vergence time of error *** experiments show that the mean value of normalized innovation squared(NIS)is reduced by 88.5%,and the convergence time of NIS value is reduced by 76.3%,the convergence time of true trajectory error of UAV is reduced by 42.3%,the convergence time of estimated trajectory error of UAV is reduced by 67.4%,the convergence time of estimated trajectory error of the spoofer is reduced by 33.7%,and the convergence time of broadcast trajectory error of the spoofer is reduced by 54.8%when the improved algorithm is *** improved algorithm can make UAV deviate from pre-set trajectory to spoofing trajectory more effectively and more subtly.

关键词： spoofing unmanned aerial vehicle(UAV) spoofer adaptively robust estimation global navigation satellite system(GNSS) normalized innovation squared(NIS)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Methods for predicting the remaining useful life of equipment in consideration of the random failure threshold

引用

Journal of Systems Engineering and Electronics 2020年第2期31卷 415-431页

作者： WANG Zezhou CHEN Yunxiang CAI Zhongyi gao yangjun WANG Lili Equipment Management&UAV Engineering College Air Force Engineering UniversityXi’an 710051China

The value range of the failure threshold will generate an uncertain influence on the prediction results for the remaining useful life(RUL) of equipment. Most of the existing studies on the RUL prediction assume that the failure threshold is a fixed value,as they have difficulty in reflecting the random variation of the failure threshold. In connection with the inadequacies of the existing research, an in-depth analysis is carried out to study the effect of the random failure threshold(RFT) on the prediction results for the RUL. First, a nonlinear degradation model with unit-to-unit variability and measurement error is established based on the nonlinear Wiener process. Second, the expectation-maximization(EM) algorithm is used to solve the estimated values of the parameters of the prior degradation model, and the Bayesian method is used to iteratively update the posterior distribution of the random coefficients. Then, the effects of three types of RFT constraint conditions on the prediction results for the RUL are analyzed, and the probability density function(PDF) of the RUL is derived. Finally,the degradation data of aero-turbofan engines are used to verify the correctness and advantages of the method.

关键词： remaining useful life(RUL)prediction random failure threshold(RFT) nonlinear Wiener process measurement error unit-to-unit variability

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Adaptive Robust Filtering Algorithm for BDS Medium and Long Baseline Three Carrier Ambiguity Resolution

引用

Journal of Geodesy and Geoinformation Science 2020年第2期3卷 53-61页

作者： yangjun gao Zhiwei LV Pengjin ZHOU Zhengyang JIA Lundong ZHANG Dianwei CONG Institute of Geospatial Information Information Engineering UniversityZhengzhou 450001China

For classical TCAR(three carrier ambiguity resolution)algorithm is affected by ionospheric delay and measurement noise,it is difficult to reliably fix ambiguity at medium and long *** improved TCAR algorithm which takes the influence of ionospheric delay into account and has good adaptive robustness is *** the basis of the non-geometric TCAR model,ionospheric delay is obtained by linearly combining extra-wide-lane with fixed ambiguity,and then wide-lane ambiguity is *** narrow-lane ambiguity by adaptive robust filtering by constructing optimal combination observation,which can effectively improve the fixed success rate of narrow-lane ambiguity and reduce the adverse effects of gross *** results show that the improved TCAR algorithm can guarantee a high fixed correct rate of wide-lane ambiguity,effectively improve fixed success rate of narrow-lane ambiguity,and has a good ability to resist gross error.

关键词： adaptive robust filter Beidou wide-lane narrow-lane ambiguity TCAR

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Design and Preparation of Selective Polypeptide Derived from Viral Macrophage Inflammatory Protein-Ⅱ specific binding with CXCR4 and study on the antibreast cancer bioactivity

Design and Preparation of Selective Polypeptide Derived from...

引用

华东六省一市生物化学与分子生物学学会-2011年学术交流会

作者： YANG Qingling CHEN Changjie DING Yongxing YANG Zhifeng gao yangjun Clinical Testing and Diagnose Experimental Center of Bengbu Medical College Department of Oncology Bengbu Central Hospital

Stromal cell-derived factor-1 and its receptor CXC chemokine receptor-4(CXCR4)have been implicated in breast cancer ***4 expression is low in normal breast tissues and high in malignant tumors and overexpression of CXCR4 is essential for HER2-mediated tumor ***,CXCR4/SDF-1interaction is one of the key requirements for breast cancer metastasis and the blockade of CXCR4 may

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Research on Aircraft Landing Based on GNSS/INS/Photogrammetry Integration Using Multi-rate Extended Kalman Filter

Research on Aircraft Landing Based on GNSS/INS/Photogrammetr...

引用

第九届中国卫星导航学术年会

作者： Pengjin Zhou Zhiwei Lv Dianwei Cong Zhengyang Jia yangjun gao Institute of Geospatial Information Information Engineering University

The carrier-based aircraft system is the core component of modern aircraft carrier combat system,a maritime platform for carrier-borne fighters,whether carrier aircraft can demonstrate combat power depends on the ability of the carrier-based aircraft to take off and *** order to improve the safety and reliability of shipboard on warship,this paper aims at GNSS/INS/Photogrammetry integrated navigation theory,discussed from the basic level of integrated navigation system on implementation and the performance of the whole *** mainly research is when satellite is not available,the inertial navigation error is corrected by the positioning of the Photogrammetry,to achieve high accuracy,high reliability and data refresh *** multi-rate kalman filter method is used to deal with the problem of the non-equal intervals between the INS and ***,by simulating the accuracy of the integrated navigation positioning of INS/Photogrammetry by multi-rate EKF filter,to verify the feasibility of the aircraft landing/carrier landing.

关键词： EKF Photogrammetry Integrated navigation Information Fusion

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

A Slowly Varying Spoofing Algorithm for Tightly-coupled GNSS/IMU with Multiple Anti-spoofing Techniques

A Slowly Varying Spoofing Algorithm for Tightly-coupled GNSS...

引用

第十三届中国卫星导航年会

作者： yangjun gao Guangyun Li Li Wang Ruoxin Zhu Pengjin Zhou Zhongpan Li PLA Strategic Support Force Information Engineering University State Key Laboratory of Geo-Information Engineering Research Institute of Surveying and Mapping Unit 66444 People's Liberation Army Unit 96944 People's Liberation Army

Satellite navigation user terminals will be seriously affected if they are not specially protected against signal interference and even spoofing. GNSS spoofing technology has gradually become the focus of jamming technology research because of its great threat and high concealment. In the face of navigation users increasingly adopt coupling GNSS and IMU to varying degrees and configuring a variety of anti-spoofing technologies to detect spoofing, even if the spoofing is carried out slowly, if the spoofing strategy is unreasonable, it will lead to the estimated parameters of the coupled filter output, or the spoofing measurement does not meet the reasonable range, which will lead to the detection of spoofing and greatly increase the difficulty of spoofing. In view of the above problems, in order to effectively counteract the unidentified object equipped with tightly-coupled navigation system by using spoofing technology, this paper establishes the GNSS spoofing model, based on the analysis of the influence mechanism of spoofing on tightly-coupled GNSS/IMU positioning, a slowly varying spoofing algorithm is proposed to spoof tightly-coupled GNSS/IMU system for configuring the least squares residual RAIM and verification and inspection of reasonable range of parameters, the algorithm gives a measurement deviation determination method to avoid a variety of anti-spoofing technologies. The algorithm can gradually pull the positioning results of the tightly-coupled system, and successfully avoid the detection of a variety of anti-spoofing technologies to achieve the purpose of spoofing. The experimental results show that the algorithm can gradually change positioning of tightly-coupled GNSS/IMU within 72 s, and the north displacement completely achieves purpose of spoofing, the east and down displacement basically achieve purpose of spoofing, the errors with the expected offset are 2.3 m and 13 m respectively. At the same time, it avoids the detection of the above anti-spo

关键词： slow varying spoofing tightly-coupled GNSS/IMU anti-spoofing techniques least squares residual RAIM verification check

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

基于双状态Χ~2检测和快速强跟踪AUKF的组合导航算法

引用

中国惯性技术学报 2019年第6期27卷 771-777页

作者：周朋进吕志伟丛佃伟高扬骏信息工程大学郑州450000 66444部队北京100042

针对GNSS/SINS/摄影测量组合导航中某个子系统发生故障时,整个导航系统易受到故障数据污染的问题,提出了一种基于快速强跟踪AUKF的双状态卡方(Χ^2)检测数据融合方法。首先,采用快速强跟踪AUKF算法进行滤波;然后,引入卡方检验通过检测UK... 详细信息

针对GNSS/SINS/摄影测量组合导航中某个子系统发生故障时,整个导航系统易受到故障数据污染的问题,提出了一种基于快速强跟踪AUKF的双状态卡方(Χ^2)检测数据融合方法。首先,采用快速强跟踪AUKF算法进行滤波;然后,引入卡方检验通过检测UKF子滤波器输出的状态向量来定位故障参数;最后,采用强跟踪滤波准确跟踪状态矢量突变以增强系统鲁棒性,并根据自适应因子实时调整预测协方差阵以修正增益矩阵,使滤波结果不受异常信息的干扰。将提出的改进算法与常规算法分别应用于无人机着陆导航系统,结果显示:与传统UKF相比,提出的算法得到的位置误差减少了62.6%以上;与强跟踪UKF相比,导航误差也至少减小了32.6%。

关键词：组合导航快速强跟踪AUKF 状态Χ^2检测信息融合

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

食物链途径人体健康风险评估的关键内容探讨

引用

环境化学 2015年第3期34卷 431-441页

作者：李丹高阳俊耿春女上海市环境科学研究院上海200233 上海应用技术学院生态技术与工程学院上海201418 中国科学院城市环境研究所厦门361021

食物是人类生存的重要保障,食品安全事关人类生命健康.食品污染始于农田耕地,还包括生产制造、包装、贮存、运输、加工等环节,每个步骤处理不当都可能发生食品安全问题.农田为食物来源的基石,是空气、水体中污染物的汇,随着城市的扩张,... 详细信息

食物是人类生存的重要保障,食品安全事关人类生命健康.食品污染始于农田耕地,还包括生产制造、包装、贮存、运输、加工等环节,每个步骤处理不当都可能发生食品安全问题.农田为食物来源的基石,是空气、水体中污染物的汇,随着城市的扩张,人类经济活动导致农田污染加剧.人类从食物中摄取污染物与经口、呼吸、皮肤的途径一样,是人体健康风险评估不可缺少的考量因素之一.我国对食品安全非常重视,2010年1月原卫生部根据《食品安全法》建立《食品安全风险监测管理规定》和《食品安全风险评估管理规定》(试行),这两份文件涵盖了从土壤到餐桌一系列的风险过程.但由于每个过程产生的原因、污染物影响机制均不同,规定离具体实际应用目标还很远.2014年环保部以保护生态环境,保障人体健康为根本,为加强污染场地环境保护监督管理,规范污染场地人体健康风险评估,发布了《污染场地风险评估技术导则》,该文建立了土壤污染造成人体健康风险评价的操作方法.然而导则考虑了经口、皮肤、呼吸及饮用地下水等9种暴露途径和评估模型,唯独缺少经食物链暴露这一重要途径的相关内容.本文以英、美两国食物链途径的场地污染风险评估为依据开展了详细探讨,深入分析了评估程序中关于土地利用方式的分类、目标人群暴露特征、污染物在食物链中传输路径、模型选取及暴露参数等内容,以期为我国制定《食物链暴露途径风险评估导则》提供一定的参考依据和指导方法.

关键词：食物链暴露途径人体健康风险评估农业用地污染场地风险评估导则.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

基于新息速率抗差估计的INS/GNSS组合导航系统欺骗检测算法

引用

中国惯性技术学报 2021年第3期29卷 328-333页

作者：张超吕志伟张伦东高扬骏信息工程大学郑州450000 地理信息工程国家重点实验室西安710054

在INS/GNSS组合导航系统中常采用基于新息的欺骗检测算法。针对现有算法对同步式欺骗干扰的检测时间较长、漏警率和误警率较高的问题,提出了一种基于新息速率抗差估计的INS/GNSS组合导航系统欺骗检测算法。该算法将Kalman滤波估计得到... 详细信息

在INS/GNSS组合导航系统中常采用基于新息的欺骗检测算法。针对现有算法对同步式欺骗干扰的检测时间较长、漏警率和误警率较高的问题,提出了一种基于新息速率抗差估计的INS/GNSS组合导航系统欺骗检测算法。该算法将Kalman滤波估计得到的新息速率作为检测量来判断是否存在欺骗干扰,并利用抗差估计削弱欺骗干扰对新息序列的影响,通过调整等价权函数的参数进一步提高算法的检测能力。仿真结果表明:该算法对诱导速率为0.1 m/s的同步式欺骗干扰的检测时间缩短了60%以上,在3路以下的卫星信号被欺骗时,通过选择合适的检测门限,误警率和漏警率均能维持在4%以内。

关键词： INS/GNSS组合导航新息速率抗差估计欺骗检测

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

TEXBAT场景的GPS接收机授时欺骗影响分析

引用

测绘科学技术学报 2019年第2期36卷 127-132,138页

作者：高扬骏吕志伟信息工程大学

针对目前有关GPS欺骗干扰技术的研究较少涉及GPS时间欺骗干扰,且因实验条件限制,难以构建与重放实际欺骗场景,因此不同场景GPS时间欺骗对目标接收机影响仍不明确的问题,基于TEXBAT(Texas Spoofing Test Battery)提供的3组不同场景GPS时... 详细信息

针对目前有关GPS欺骗干扰技术的研究较少涉及GPS时间欺骗干扰,且因实验条件限制,难以构建与重放实际欺骗场景,因此不同场景GPS时间欺骗对目标接收机影响仍不明确的问题,基于TEXBAT(Texas Spoofing Test Battery)提供的3组不同场景GPS时间欺骗数据集,建立了GPS时间欺骗模型,分析了欺骗过程中存在的两种相位对齐模式对欺骗行为的影响;利用自编软件对采集的欺骗场景的原始高保真数字实时数据进行数据处理,分别得到目标接收机受欺骗与未受欺骗时的接收机钟差及钟差变化率、多普勒频率与载噪比、载波相位与接收机天线位置随时间的变化情况;深入分析了不同场景GPS时间欺骗对目标接收机的影响。实验结果表明,不同场景GPS时间欺骗将从不同角度有效影响GPS定时结果,所得结论将为GPS时间欺骗与抗欺骗技术提供重要参考。

关键词：时间欺骗欺骗场景接收机钟差钟差变化率载噪比 TEXBAT数据集

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：