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Signal quality analysis and quality check of BDS3 Precise Point Positioning in the Arctic Ocean

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Acta Oceanologica Sinica 2022年第2期41卷 166-179页

作者： Xiaoguo Guan hongzhou chai Guorui Xiao Zhenqiang Du Wenlong Qi Xueping Wang College of Urban and Environmental Sciences Xuchang UniversityXuchang 461000China Institute of Geospatial Information Information Engineering UniversityZhengzhou 450001China Department of Civil Engineering Henan Vocational College of Water Conservancy and EnvironmentZhengzhou 450001China

This study analyzes the signal quality and the accuracy of BeiDou 3 rd generation Satellite Navigation System(BDS3) Precise Point Positioning(PPP) in the Arctic Ocean. Assessment of signal quality of BDS3 includes signal to noise ratio(SNR), multipath(MP), dilution of precision(DOP), and code-minus-carrier combination(CC). The results show that, 5 to 13 satellites are visible at any time in the Arctic Ocean area as of September 2018, which are sufficient for positioning. In the mid-latitude oceanic region and in the Arctic Ocean, the SNR is 25–52 dB Hz and the MP ranges from-2 m to 2 m. As the latitude increases, the DOP values show large variation, which may be related to the distribution of BDS satellites. The CC values of signals B1 I and BIC range from-5 m to 5 m in the mid-latitude sea area and the Arctic Ocean, which means the effect of pseudorange noise is small. Moreover, as to obtain the external precise reference value for GNSS positioning in the Arctic Ocean region is difficult, it is hard to evaluate the accuracy of positioning results. An improved isotropy-based protection level method based on Receiver Autonomous Integrity Monitoring is proposed in the paper, which adopts median filter to smooth the gross errors to assess the precision and reliability of PPP in the Arctic Ocean. At first, the improved algorithm is verified with the data from the International GNSS Service Station Tixi. Then the accuracy of BDS3 PPP in the Arctic Ocean is calculated based on the improved algorithm. Which shows that the kinematic accuracy of PPP can reach the decimeter level in both the horizontal and vertical directions, and it meets the precision requirements of maritime navigation.

关键词： BDS3 Arctic Ocean signal quality analysis protection level quality check Precise Point Positioning satellite navigation

Study on the detection of abnormal sounding data based on LS-SVM

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Acta Oceanologica Sinica 2010年第6期29卷 115-120页

作者： HUANG Xianyuan ZHAI Guojun SUI Lifen chai hongzhou Institute of Surveying and Mapping Information Engineering University Zhengzhou 450052 China Naval Institute of Hydrographic Surveying and Charting Tianjin 300061 China

A new method of detecting abnormal sounding data based on LS-SVM is *** theorem proves that the trend surface filter is the especial result of *** order to depict the relationship of trend surface filter and LS-SVM,a contrast is *** example shows that abnormal sounding data could be detected effectively by LS-SVM when the training samples and kernel function are reasonable.

关键词： LS-SVM trend surface filter kernel function abnormal sounding data

A novel method corrected multipath error oriented the oceanic buoy

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A novel method corrected multipath error oriented the oceani...

第十三届中国卫星导航年会

作者： Xiangyu Tian hongzhou chai Institute of Surveying and Mapping Information Engineering University

The signals always form the reflection over the sea. The characteristics and correct method of the multipath over the sea are worthy of research. Based on the assumption that the high-precision posterior residual only contains multipath error and noise, this paper adopts forward and backward filtering estimation and PPP-AR strategy to obtain the high-precision observational post-residual and then calculates the multipath error effect based on the mean denoising method. The azimuth and elevation angle mapping relationship of the azimuth angle and elevation angle are constructed, the station center multipath hemispherical map（MHM） is constructed, and the different grid resolutions of MHM are experimentally studied. The experimental results show that the MHM model can effectively improve the positioning effect of the marine buoy rather than no multipath correction. Not only the positioning accuracy can be improved, but the ambiguity fixed-rate and convergence time of positioning can also be improved, especially the 2°×2° resolution of the MHM model has good results in both static and dynamic scenarios.

关键词： BDS oceanic buoy multipath precise positioning

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基于量子照明的导航测距方案

光学学报 2023年第1期43卷 244-255页

作者：惠俊柴洪洲中国人民解放军战略支援部队信息工程大学地理空间信息学院河南郑州450001

针对以往脉冲纠缠测距方案对光子损耗十分敏感的特点及量子干涉法测距中利用光路延迟测距时难以实现远距离传输的问题,利用量子压缩效应来提升时延估计精度,同时还提出一种基于量子照明原理的非经典纠缠导航测距方案,对目标存在的回波... 详细信息

针对以往脉冲纠缠测距方案对光子损耗十分敏感的特点及量子干涉法测距中利用光路延迟测距时难以实现远距离传输的问题,利用量子压缩效应来提升时延估计精度,同时还提出一种基于量子照明原理的非经典纠缠导航测距方案,对目标存在的回波信号进行统计判断,从而确定距离参数。在相干探测的基础上,分别研究了相干态、热态和压缩态等3种高斯量子态的统计特性,并对量子照明测距方案中经典相干态与双模压缩真空态的信号检测性能进行了理论分析和数值模拟实验。结果表明,相较于传统测距方法,利用量子信号压缩和纠缠特性的方法能有效提高导航测距的距离分辨率,性能上优于经典方案,且在噪声光子数较多时具有更强的抗环境干扰能力。

关键词：量子光学无线电导航量子照明量子纠缠压缩态脉冲测距

A time-difference RTK model considering ephemeris error

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A time-difference RTK model considering ephemeris error

第十三届中国卫星导航年会

作者： Liu Chunhe chai hongzhou Xiang Minzhi Information Engineering University

The time difference RTK（TDRTK） of GNSS can obtain highprecision relative position information, which can be used to constrain the cumulative error of posi-tioning methods such as inertial navigation ***, with the increase of time interval, the cumulative error over time seriously affects the fixed success rate of differential ambiguity and relative positioning accuracy. Through in-depth analysis of the factors affecting TDRTK, it is found that the epoch difference of broadcast ephemeris error can reach the decimeter level, which is the main factor affecting the fixed success rate of differential ambiguity. In this paper, the influ-ence of ephemeris error on the positioning is weakened by three carrier ambiguity resolution and robust Mestimation, and the quality of positioning accuracy con-trolled by the isotropybased protection level. Experimental results show that this method can effectively improve the fixed success rate of differential ambiguity and positioning accuracy.

关键词： time difference RTK protection level robust M-estimation

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卫星钟差预报的T-S模糊神经网络法

测绘学报 2020年第5期49卷 580-588页

作者：王旭柴洪洲王昶信息工程大学地理空间信息学院河南郑州450001 辽宁生态工程职业学院测绘工程学院辽宁沈阳110101 辽宁科技大学土木工程学院辽宁鞍山114051

结合钟差数据的特点,提出了一种基于变化率的T-S模糊神经网络(TSFNN)钟差预报模型。首先计算相邻历元间钟差的变化率值并对其进行建模;然后利用TSFNN模型预报钟差变化率值,再将预报的变化率值还原,得到钟差预报值;最后,通过算例将本文... 详细信息

结合钟差数据的特点,提出了一种基于变化率的T-S模糊神经网络(TSFNN)钟差预报模型。首先计算相邻历元间钟差的变化率值并对其进行建模;然后利用TSFNN模型预报钟差变化率值,再将预报的变化率值还原,得到钟差预报值;最后,通过算例将本文所建模型与IGU-P产品、二次多项式模型(QP)及灰色模型(GM(1,1))进行试验对比。结果表明:在使用变化率方法后,TSFNN模型预报的精度和稳定性分别提高了69.8%和76.3%,而且与IGU-P钟差产品相比,预报的精度高出约10倍,同时模型预报的效果优于两种常用模型。因此,该模型可以实现卫星钟差较高精度的预报。

关键词：卫星钟差 T-S模糊神经网络变化率预报

基于粒子群优化神经网络模型的BDS-3卫星钟差预报

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中国惯性技术学报 2023年第1期31卷 33-39页

作者：王旭张文柴洪洲辽宁科技学院资源与土木工程学院本溪117004 辽宁科技大学土木工程学院鞍山114051 战略支援部队信息工程大学郑州450001

针对在钟差预报中小波神经网络预报结果的不稳定性问题,提出一种粒子群优化小波神经网络的钟差预报模型,以提高预研结果稳定性。该模型是将小波神经网络的各阈值和权值作为粒子的位置向量,通过粒子群算法寻求网络的阈值和权值的最优值,... 详细信息

针对在钟差预报中小波神经网络预报结果的不稳定性问题,提出一种粒子群优化小波神经网络的钟差预报模型,以提高预研结果稳定性。该模型是将小波神经网络的各阈值和权值作为粒子的位置向量,通过粒子群算法寻求网络的阈值和权值的最优值,降低了网络出现局部极值的概率,从而改善了小波神经网络预报结果的稳定性。通过分析粒子群算法最优个体适应度值变化曲线图、比较粒子群算法优化前后WNN模型训练误差以及两种模型多次预报结果,验证了模型的有效性。并与二次多项式(QP)及灰色(GM(1,1))两种常用模型进行实验对比。实验结果表明:在24小时钟差预报中,所提方法相比于两种常用模型预报的精度分别提高了约49.7%和66%,并且预报得到钟差精度相比于超快速钟差产品提高了97.7%,质量明显优于超快速钟差产品。

关键词：卫星钟差粒子群算法精密单点定位小波神经网络

An Improved Clock Jump Detection Method In Real-time PPP

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An Improved Clock Jump Detection Method In Real-time PPP

基于纠缠数态和奇偶校验的光纤陀螺仪相位测量性能分析

第十一届中国卫星导航年会

作者： Kaidi Jin hongzhou chai Changjian Liu Chuhan Su Information Engineering University

In view of the fact that most current cycle clip detection methods do not take into account the clock jump of receivers,which results in the reduction of PPP data processing accuracyand efficiency,thi

关键词： PPP data preprocessing Receiver clock jump Cycleslip Clock jump detection and repair

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中国惯性技术学报 2022年第6期30卷 791-798页

作者：惠俊柴洪洲杜祯强信息工程大学郑州450001

针对多光子最大纠缠NOON态难以直接作为光纤陀螺仪的双模输入态,且当输出态的光子数差算符为0时标准光强差测量方案将失效的问题,提出了一种基于纠缠光子数态和奇偶校验方案的双端口输入/输出光纤陀螺仪结构。阐述了基于关联数态的纠缠... 详细信息

针对多光子最大纠缠NOON态难以直接作为光纤陀螺仪的双模输入态,且当输出态的光子数差算符为0时标准光强差测量方案将失效的问题,提出了一种基于纠缠光子数态和奇偶校验方案的双端口输入/输出光纤陀螺仪结构。阐述了基于关联数态的纠缠光纤陀螺仪的工作原理和奇偶校验测量方法,首次推导了双模纠缠光子数态光纤陀螺仪的相位估计误差公式,并将双光子、四光子双模纠缠数态输入与具有相同光子数(光功率)的最大纠缠NOON态输入以及经典相干态输入的Sagnac相位测量精度进行了对比。理论分析表明,利用纠缠光子数态(不一定是最大纠缠态)结合奇偶校验测量可以突破散粒噪声限制而达到海森堡极限,所提方法仅需对量子光学陀螺仪的输出端进行奇偶校验即可实现,是增强光学陀螺仪输出精度的一种新方法。

关键词：光纤陀螺纠缠数态奇偶校验 Sagnac相位