2017 Forum on Cooperative Positioning and Service (CPGPS）最新文献_第6页

An improved model and simulator design of GNSS ocean reflected signals GNSS海洋反射信号改进模型及模拟器设计

2017 Forum on Cooperative Positioning and Service (CPGPS） Pub Date : 2017-05-01 DOI: 10.1109/CPGPS.2017.8075116

Bowen Li, Bo Zhang, Dongkai Yang, Yongqiang Qi

{"title":"An improved model and simulator design of GNSS ocean reflected signals","authors":"Bowen Li, Bo Zhang, Dongkai Yang, Yongqiang Qi","doi":"10.1109/CPGPS.2017.8075116","DOIUrl":"https://doi.org/10.1109/CPGPS.2017.8075116","url":null,"abstract":"Global Navigation Satellite System-Reflection (GNSS-R) technology has attracted more and more attention in remote sensing and navigation field, especially in the ocean remote sensing. A feasible GNSS-R model based on reverse thinking method was proposed in our previous work. In this paper, in order to make the model applicable to the case of higher wind speed, we presented an improved GNSS-R model by expanding the range of time delay from 5 to 9 chips. A mathematical derivation was built to guide the design of the model. The number of reflected signals was 30 and the delay interval was 0.3 chip in the newly built model by optimizing the accuracy and computation of the model. Moreover, a GNSS-R software simulator was designed based on the improved GNSS-R model. The simulation reflected signals were compared with the experimental data collected in Yantai, Shandong province. Good agreement was found in the simulation results and experimental data, and the correlation coefficient between two correlation power curves was 0.9964, with the error in retrieving wind speed of 0.8 m/s. These results proved that the improved GNSS-R model and the simulator design can be applied in simulation of GNSS ocean reflected signals.","PeriodicalId":340067,"journal":{"name":"2017 Forum on Cooperative Positioning and Service (CPGPS）","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116685793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

PPP augmentation with current Galileo and BeiDou constellations 通过当前的伽利略和北斗星座增强PPP

2017 Forum on Cooperative Positioning and Service (CPGPS） Pub Date : 2017-05-01 DOI: 10.1109/CPGPS.2017.8075127

N. Zang, Bofeng Li, Yunzhong Shen

引用次数: 0

SSV visibility evaluation based on different GPS transmitting antenna characteristics 基于不同GPS发射天线特性的SSV能见度评价

2017 Forum on Cooperative Positioning and Service (CPGPS） Pub Date : 2017-05-01 DOI: 10.1109/CPGPS.2017.8075115

Maolin Chen, X. Zhan, Baoyu Liu, Wenhan Yuan

引用次数: 3

The influence of heat transfer rate on the thermally induced nonreciprocal error of FOG 传热速率对光纤陀螺热致非倒数误差的影响

2017 Forum on Cooperative Positioning and Service (CPGPS） Pub Date : 2017-05-01 DOI: 10.1109/CPGPS.2017.8075092

Pengfei Wu, Dezhi Duan, Guochen Wang, Runfeng Zhang, Jiachong Chang

{"title":"The influence of heat transfer rate on the thermally induced nonreciprocal error of FOG","authors":"Pengfei Wu, Dezhi Duan, Guochen Wang, Runfeng Zhang, Jiachong Chang","doi":"10.1109/CPGPS.2017.8075092","DOIUrl":"https://doi.org/10.1109/CPGPS.2017.8075092","url":null,"abstract":"In this paper, the model of thermally induced nonreciprocal error is established in three-dimensional cylindrical coordinate system. Make finite-element thermal analysis for fiber loop to get the simulated result of temperature field inside the fiber loop by ANSYS based on the actual temperature on the surface of fiber loop detected under the static condition, get heat transfer rates by comparing area of regions where temperature changes inside the fiber loop section at the equal time intervals, through which we can guess the relationship between the thermally induced nonreciprocal error and heat-transfer rate. Different heat transfer rates are achieved by changing layers of fiber loop under the premise of the same fiber length and the same thermal load, then gain temperature curves of center node on different models. Program the algorithm based on the Shupe effect and the theory of thermal stress to calculate the thermally induced nonreciprocity error for different fiber loop models, which is convenient to determine the optimal layers based on quadrupole winding method. This paper shows the relationship between thermally induced nonreciprocal error and the heat transfer rate.","PeriodicalId":340067,"journal":{"name":"2017 Forum on Cooperative Positioning and Service (CPGPS）","volume":"98 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120978611","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A reference satellite selection method based on maximal elevation angle during the observation period 基于观测期内最大仰角的参考卫星选择方法

2017 Forum on Cooperative Positioning and Service (CPGPS） Pub Date : 2017-05-01 DOI: 10.1109/CPGPS.2017.8075137

Chen Zhengsheng, Z. Qinghua, Sun Dashuang, Lv Hao, Zhang Runtao, Liu Xuerui, Chen Jinlong

{"title":"A reference satellite selection method based on maximal elevation angle during the observation period","authors":"Chen Zhengsheng, Z. Qinghua, Sun Dashuang, Lv Hao, Zhang Runtao, Liu Xuerui, Chen Jinlong","doi":"10.1109/CPGPS.2017.8075137","DOIUrl":"https://doi.org/10.1109/CPGPS.2017.8075137","url":null,"abstract":"In the research and precise applications of Global Navigation Satellite System(GNSS), it is often necessary to choose a reference satellite for differential combination calculation, such as Real Time Kinematic(RTK) positioning, Uncalibrated Phase Delays(UPD) solving based on between satellite difference etc. In a specific period, the more reasonable selection of the reference satellite is, the better achievements of the calculation results will be. In this paper, three reference satellites selection principles are used: 1) the observation period is long enough; 2) satellite elevation angle is high enough and 3) reference satellite is not changed in a specified period. Based on these principles, two common reference satellite selection algorithms are compared, including the algorithm of Maximal Elevation Angle in Whole Period and the algorithm of Longest Period Span with a restriction condition of maximal elevation angle during the specified period. After analyzing the changes of elevation angle of all the visible GNSS satellites of three observation stations in different latitude with time, it is found that there is a parabola relationship between elevation angles (over 30°) of satellite and epochs. This paper presents a fast reference satellite selection algorithm based on the maximum elevation angle at the epoch period center. The analysis results show that the new algorithm is more easily realized under the same conditions than the other two algorithms, and the selected reference satellite not only has enough available period, but also has better geometry structure.","PeriodicalId":340067,"journal":{"name":"2017 Forum on Cooperative Positioning and Service (CPGPS）","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130499265","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Preliminary analysis of frequency jumps in BDS satellite clock BDS卫星时钟频率跳变的初步分析

2017 Forum on Cooperative Positioning and Service (CPGPS） Pub Date : 2017-05-01 DOI: 10.1109/CPGPS.2017.8075135

Bin Wang, Junping Chen

引用次数: 0

Seasonal variations of global stratospheric gravity wave activity revealed by COSMIC RO data COSMIC RO数据揭示的全球平流层重力波活动的季节变化

2017 Forum on Cooperative Positioning and Service (CPGPS） Pub Date : 2017-05-01 DOI: 10.1109/CPGPS.2017.8075102

Xiaohua Xu, Daocheng Yu, Jia Luo

{"title":"Seasonal variations of global stratospheric gravity wave activity revealed by COSMIC RO data","authors":"Xiaohua Xu, Daocheng Yu, Jia Luo","doi":"10.1109/CPGPS.2017.8075102","DOIUrl":"https://doi.org/10.1109/CPGPS.2017.8075102","url":null,"abstract":"Seasonal variations of gravity waves over the globe in the stratosphere are investigated using radio occultation data from the Constellation Observing System for Meteorology, Ionosphere and Climate mission from September 2006 to June 2016. The global distributions of 10-year averaged seasonal means of gravity waves indicate that potential energy is large over tropical and subtropical latitudes (30°S-30°N) in all seasons, as well as over middle and high latitudes in winter hemisphere. Gravity wave potential energy and the outgoing longwave radiation (OLR) which is a proxy for deep convection are negative correlated at equatorial latitudes. This suggests that convection is the primary source of gravity waves in the Tropics. At 50°N and 50°S, gravity waves are mainly generated by the diverse terrains of mountains, and either propagate upward or are filtered out under the effect of background zonal wind. Intense eastward wind, which mainly happens in winter hemisphere, makes great contributions to the upward propagation of gravity waves, while 0 m/s wind level, which is apparent in summer hemisphere, filters out most of the gravity waves. This can explain the seasonal variations of gravity waves at middle and high latitudes.","PeriodicalId":340067,"journal":{"name":"2017 Forum on Cooperative Positioning and Service (CPGPS）","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127178797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

A power distributing strategy of GNSS spoofing signal under dual-threshold 双阈值下GNSS欺骗信号的功率分配策略

2017 Forum on Cooperative Positioning and Service (CPGPS） Pub Date : 2017-05-01 DOI: 10.1109/CPGPS.2017.8075110

Sen Huang, Shuxin Chen, Kun Chen, Zhuowei Liu, Jianhua Chen, Hao Wu

引用次数: 0

GLONASS precise point positioning considering the influence of code inter-frequency biases 考虑码间频偏影响的GLONASS精确点定位

2017 Forum on Cooperative Positioning and Service (CPGPS） Pub Date : 2017-05-01 DOI: 10.1109/CPGPS.2017.8075126

Zongpeng Pan, Hongzhou Chai, Yang Chong, Yulong Kong, Rui Wang, Xiaodong Pan

引用次数: 2

Feasibility analysis of low-cost GNSS receivers for achieving required positioning performance in CAV applications 低成本GNSS接收机在CAV应用中实现所需定位性能的可行性分析

2017 Forum on Cooperative Positioning and Service (CPGPS） Pub Date : 2017-05-01 DOI: 10.1109/CPGPS.2017.8075154

Yijian Cui, Xiaolin Meng, Qusen Chen, Yang Gao, Changxue Xu, Simon Roberts, Yi-Ting Wang

{"title":"Feasibility analysis of low-cost GNSS receivers for achieving required positioning performance in CAV applications","authors":"Yijian Cui, Xiaolin Meng, Qusen Chen, Yang Gao, Changxue Xu, Simon Roberts, Yi-Ting Wang","doi":"10.1109/CPGPS.2017.8075154","DOIUrl":"https://doi.org/10.1109/CPGPS.2017.8075154","url":null,"abstract":"For Connected and Autonomous Vehicle (CAV) applications, the location solution is desired to provide better than 0.1m real-time positioning accuracy. This level of accuracy can only be achieved by using geodetic GNSS receivers under an open sky observation condition, and each unit costs around £20,000. This kind of geodetic GNSS receiver is not a good option for mass market use in terms of price and ubiquity aspects. Therefore, using low-cost receiver to achieve real-time, high accuracy and ubiquitous positioning performance could be a future trend. This paper will first establish a framework of assessing low-cost receivers based on required navigation performance (RNP) concept in aviation and required accuracy categories in ITS. Then adynamic test that was conducted to simulate the future CAV driving environment will be introduced. Under the guidance of the former established framework, the collected data was post-processed to explore the real positioning performance of both two grades receivers. By comparing real-time/post-processed results and high-end/low-cost receivers, the limitations and technical gaps between two types of receivers, as well as current positioning solution and required positioning performance will be identified.","PeriodicalId":340067,"journal":{"name":"2017 Forum on Cooperative Positioning and Service (CPGPS）","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122902529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13