| 书目名称 | China Satellite Navigation Conference (CSNC) 2016 Proceedings: Volume I | | 编辑 | Jiadong Sun,Jingnan Liu,Feixue Wang | | 视频video | http://file.papertrans.cn/226/225383/225383.mp4 | | 概述 | Collects selected CSNC2016 papers.Showcases achievements and progress of BDS.Presents the latest studies of Global Navigation Satellite System in China.Covers hot topics in Global Navigation Satellite | | 丛书名称 | Lecture Notes in Electrical Engineering | | 图书封面 |  | | 描述 | .TheseProceedings present selected research papers from CSNC2016, held during18th-20th May in Changsha, China. The theme of CSNC2016 is Smart Sensing, SmartPerception. These papers discuss the technologies and applications of theGlobal Navigation Satellite System (GNSS), and the latest progress made in theChina BeiDou System (BDS) especially. They are divided into 12 topics to matchthe corresponding sessions in CSNC2016, which broadly covered key topics inGNSS. Readers can learn about the BDS and keep abreast of the latest advancesin GNSS techniques and applications. . | | 出版日期 | Conference proceedings 2016 | | 关键词 | BeiDou System (BDS); CSNC2016; Chinese GNSS; Compass/BDS; GNSS | | 版次 | 1 | | doi | https://doi.org/10.1007/978-981-10-0934-1 | | isbn_softcover | 978-981-10-9286-2 | | isbn_ebook | 978-981-10-0934-1Series ISSN 1876-1100 Series E-ISSN 1876-1119 | | issn_series | 1876-1100 | | copyright | Springer Science+Business Media Singapore 2016 |
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Front Matter |
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Abstract
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Abstract
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The Research on Four-Dimensional Water Vapor Tomography Based on Real-Time PPP Technique |
Qingzhi Zhao,Yibin Yao,Chaoqian Xu |
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Abstract
With the development of International GNSS Service (IGS) real-time pilot project (RTPP) acquiring precipitable water vapor (PWV) with high accuracy has become a reality based on the real-time precise point pointing (RT-PPP) technique. The accuracy of zenith total delay (ZTD) and PWV derived from RT-PPP have been validated using observed global positioning system (GPS) data and meteorology data from Satellite Positioning Reference Station Network (SatRef) in 2014. The ZTD comparison with that from afterwards PPP and GAMIT software shows that the relative coefficients are 0.9786 and 0.9687, respectively. The PWV comparison with that from radiosonde shows that the relative coefficient and RMS are 0.9512 and 2.13 mm, respectively. It is a clear evidence that the RT-PPP technique has a similar accuracy with the result calculated using afterwards IGS products. However, PWV is mean of water vapor information of many GNSS signal rays during a period of time over the station, which cannot reflect the three-dimensional water vapor distribution. Slant water vapor (SWV) can be obtained by mapping PWV at different elevation and azimuth angles. The tomographic experiment has been performed using
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A Spread Spectrum Communication Method Based on GNSS Positioning and Timing System |
Jie Zhang,Zhaorui Wang,Qingtao Wan |
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Abstract
Application of spread spectrum technology can effectively solve the problem of power constraints in satellite communication. A difficulty of spread spectrum communication is fast acquisition of spread spectrum signal. For the lack of priori information, code phase and frequency offset are both random quantities, it usually takes a long time in signal acquisition, which would reduce the efficiency of the communication especially for the burst communication. Traditional methods realized spread spectrum signal fast acquisition at the expense of acquisition algorithm complexity and hardware resources cost. This article presents a low cost new code phase and carrier frequency of spread spectrum signal correction method that is easy to implement based on GNSS positioning and timing system. In order to correct the frequency offset and code phase difference, position and time information given by GNSS system are used to build the network-wide time synchronization system and indirect loopback correction system in ground station. At the same time, with the aid of satellite timing, the influence of clock error is eliminated in the way of DDS. With the above measures, the spread spectrum signa
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The Effect of GNSS Sites Distribution on TEC Derivation |
Xiaolan Wang,Guanyi Ma,Qingtao Wan,Jinghua Li,Jiangtao Fan,Jie Zhang |
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Abstract
With worldwide increased Global Navigation Satellite System (GNSS) receivers, it is possible to obtain the ionospheric total electron content (TEC) and hence monitor the ionosphere with GNSS. Using a thin layer assumption of the ionosphere and dual-frequency Global Positioning System (GPS) observations from 16 geomagnetically quiet days in four seasons of 2006, this paper adopts the spherical harmonic model to fit TEC and investigates the effects of two network constitutions on global TEC derivation, one with 275 GPS receivers and the other with 125 GPS receivers. The results show that the data can be well fitted for both network constitutions. The derived TECs are consistent with each other for four seasons. This is especially true for TECs at low- and mid-latitude. The derived satellite and receiver biases are stable during the year. The standard deviation of the satellite and the receiver biases are less than 0.5 and 3 ns, respectively.
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GNSS-R Aircraft Flight Test Based on Digital Beam Forming |
Kangning Zhang,Fenghui Li,Xingguo Li,Linfei He,Qijia Dong,Wenliang Zhao,Fuzhan Yue |
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Abstract
The technology can be used to measure the wind and the height of the sea based on the GNSS-R, It can be complementary to the other advantages of sea measurements, has more advantages than other methods when it can be used to constitute constellation. When to deal with the environments of the sea surface, only need is to install the receiver, so compared to traditional means of remote sensing, GNSS-R technology reduce costs, weight, and the power, at the same time, the technology can improve the resolution and accuracy, It can be used to the new way at remote sensing. This paper designs a new GNSS-R receiver based on the Digital beam forming (DBF), the receiver through the dbf to synthesis the receive signal. The receiver has 31 dbf channels, so it can complete the synthesis a plurality of different direction’s signal at the same time. In order to effectively improve the detection area, the receiver can achieve the angle scanning between the fixed angle and the dynamic angle. In order to test the receiver, we did an experiment by using the plane on November 3, 2015 at Bohai Bay, flying height about 1200 meters, in the experiment, we successfully captured the reflected signals at the
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GPS Radio Occultation Inversion Analysis of Neutral Atmospheric Detection Technology Based on Dual-F |
Lu Zhang,Xingguo Li,Fenghui Li,Junbo Han,Qijia Dong,Yingna Liu,Meng Wang |
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Abstract
Compared with the traditional radio atmospheric detection and radar detection, GNSS occultation technique provides a powerful tool for atmospheric detection, the GNSS occultation technique which has the characteristics of without calibration, all-weather, high precision, high vertical resolution, and global uniform coverage. The GNSS occultation technique based on the atmosphere GPS/LEO radio occultation, GPS satellite radio signal is obscured by Earth’s atmosphere, GPS satellite radio signal cutting the Earth’s atmosphere and ionosphere sectional, then the radio signal refracted before reach LEO satellites. The received GPS signal contains information of the Earth’s atmosphere and ionosphere. We can get atmospheric and ionosphere electron density profile, the total electron content of the ionosphere and atmospheric bending angle profiles, index of refraction, temperature and barometric pressure through the relevant atmospheric inversion model. This paper introduces GPS radio occultation atmospheric detection technology based on mountain-based experimental verification, test is located at Wuling Mountain Peak of Yanshan Mountains (located in Chengde in Hebei Province, 117.48°E, 40.
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Research on BD Nanosecond One-Way Timing Method |
Longxia Xu,Dandan Li,Xiaohui Li,Feng Zhu |
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Abstract
Different from other GNSS navigation systems, the constellation of BD navigation system consists of GEO, MEO, and IGSO satellites which is the characteristic of BD. The altitude of GEO orbit is higher than that of MEO. Therefore, the ephemeris and ionosphere delay errors are more dependent in the paths from GEO satellites to two users involved in time comparison. Therefore, the results of common view time transfer based on GEO satellites are better than that of MEO. A method of changing the generation of UTC time parameters is proposed which makes full use of the advantages of GEO satellites in time transfer. The time difference between system time of navigation system and UTC(K) is monitored by user terminal which referenced with a ultrastable frequency signal. The UTC time parameters are generated based on these time differences. Users with the new UTC time parameters not only can get the time difference between their local time and UTC(K), but also can farther eliminate the errors in one-way timing method. Without aggravating the burden of users, the precision of this method is equivalent to that of common view time transfer which is superior to the existed GPS and BD one-way ti
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Preliminary Research on Snow Depth Monitoring with GPS SNR |
Kaiyang Dai,Qin Zhang,Shuangcheng Zhang,Ning Zhang,Kai Liu,Xiaowei Hou |
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Abstract
The GNSS observations quality can be affected by the environment around the station. Using the signal-to-noise ratios to correct the observation influenced by multipath effect has attracted attention of many scholars. Meanwhile, using GNSS-MR technology based on SNR information to study environmental changes around the station has become a new research subject. And that makes the GNSS active in the field of remote sensing. First, the relationship between GPS multipath and SNR is analyzed in this paper. Then, based on the SNR and the signal amplitude variation, the basic principle of GPS-MR technology is given. GPS observation data in P351 and SNOTEL station snow data are used to evaluate the effectiveness of the algorithm. Also, satellite reflection point trajectory and satellite selection of snow depth detection are further analyzed. The experimental results show that: GPS-MR can be used to measure the snow depth, and its detection precision is 0.08 m. GPS-MR technology not only can make full use of multipath effect, but also provides a development space for GPS technology using in the surface environment monitoring.
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The Research of High-Frequency Single-Epoch GNSS Kinematic Differential Positioning Technology |
Dashuai Chai,Shengli Wang,Xiushan Lu,Bo Shi |
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Abstract
The paper proposed the mathematical model, the processing method, and the basic process for the kinematic differential positioning. First, the single epoch is used for initializing, and the wide-lane ambiguity is searched and fixed to calculate the basic ambiguity during this process. Then, the baseline solution is calculated by the least squares method, and gross error is processed by using robust estimation. Moreover, the residual error is considered to correct the basic ambiguity. Finally, epoch is updated. If there is a situation that new satellite appears or cycle slip happens, the corresponding basic ambiguity is needed to be calculated again, otherwise the basic ambiguity is only transmitted. An example, in which 20 Hz GNSS data is sampled by V-Surs I vehicle-borne three-dimensional mobile surveying system, is presented in this paper. The method mentioned above is used to calculate this data and compare it with the results calculated by the GNSS/INS tightly coupled of Inertial Explorer 8.60 software. The experimental results demonstrate that the method has high stability and accuracy in the medium-short baseline, and RMS in the north direction is less than 2 cm, RMS in east
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Performance Analysis of Real-Time BDS Clock Estimation with Different Orbit Accuracy |
Wenju Fu,Qin Zhang,Guanwen Huang,Pingli Li,Bobin Cui,Rui Tu |
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Abstract
Based on un-differenced model of clock estimation, the mathematic model of real-time clock estimation influenced by orbit error is derived, and then the estimation accuracy of BDS real-time clock and real-time positioning accuracy are analyzed. The results show that real-time BDS clock accuracy achieves 0.30 ns using the rapid orbit product and the corresponding 2-D and 3-D real-time positioning accuracy are 0.36 and 0.48 m, respectively. With 0.1 and 0.2 m orbit error influenced, the decreased accuracy of real-time clock estimation is 0.05 and 0.14 ns, and the decreased positioning accuracy is 0.057 and 0.154 m, respectively.
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Correlation Analysis Between Ionosphere Anomaly and Earthquake |
Yulong Kong,Hongzhou Chai,Huarun Wang |
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Abstract
This document took the long sequence of IGS ionospheric VTEC (vertical total electron content unit) products as original data, based on the theory research of various abnormally detection methods, we could select the optimal method to process VTEC products, combined with earthquake cases of which the magnitude greater than Ms5.0 in global range from 2003 to the present. According to the principle of mathematical statistics, we found the relationship between the abnormal of ionosphere and the factors of earthquakes. Through calculating the correlation coefficient and the single factor variance analysis between earthquake factors and the ionosphere anomalies, we not only confirmed that the earthquake has an effect on ionosphere anomalies, but also proved the conclusion that the magnitude has the positive correlation with the positive ionosphere anomalies, and under the condition of single factor analysis, we confirmed that the magnitude made a significant impact on the ionosphere anomalies before the earthquake happened.
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The Satellite Selection Algorithm of GNSS Based on Neural Network |
Jinben Wei,Anmin Ding,Kezhao Li,Leijie Zhao,Yunkai Wang,Zhiwei Li |
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Abstract
With the development of Global Navigation Satellite System (GNSS), there is an increase in the number of visible satellite in navigation and positioning. Calculating all visible satellite not only makes the hardware design of the receiver harder, but also can’t guarantee to improve the accuracy of the positioning results, so it is significant to take a certain satellite selection algorithm to the visible satellites optimization. The traditional optimal satellite selection algorithm is complicated, and it also influences the real-time performance of the navigation and positioning. The subsequent improved satellite selection algorithm has effectively enhanced in robustness, accuracy and real-time. The satellite selection algorithm by using Generalized Regression Neural Network (GRNN) to predict GDOP is proposed. The simulation results showed that the algorithm has improved in robustness, accuracy and real-time, and it has certain exploring value for the GNSS satellite selection algorithm with machine learning.
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Stability Analysis of the CORS Reference Station Network and Terrestrial Network |
Cai-ya Yue,Ya-min Dang,Qiang Yang,Xue-li Han |
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Abstract
The changes of the Earth rotation, the plates’ movement and the environment of observation can cause the point shift in the GPS network, even if the observation period is a month, the displacement of the two times cannot be ignored. In this paper, take the terrestrial network station and CORS station network in Sichuan province as an example, using the method of limit error ellipse, the horizontal direction of the station is compared and analyzed. And using the stability of the station to indicate the degree of displacement, so as to identify the stability of the fixed point and unstable fixed point; at the same time, the stability of the elevation direction of the station is analyzed by the method of mathematical statistics. It provides a theoretical basis for the analysis of the stability of the network and a reference basis for the selection of the stability of the station to do a permanent reference station.
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A New Modified Method for Cycle-Slips Detection Based on Polynomial Fitting Method |
Y. K. Wang,Kezhao Li,Leijie Zhao,Zhiwei Li,Jinben Wei |
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Abstract
The polynomial fitting method is used widely to detect cycle slips of carrier phases of GNSS for its easily computer programming and simple algorithm. But, this method is influenced by the observation errors and sampling rates. In this contribution, the polynomial fitting method and the Newton interpolation method are combined to solve those influences. In this paper, we introduce the new method theory and its mathematical model. Finally a test is taken to prove the reliable of the new method. The result shows that the new method does well in cycle-slips detection, and it reduces the calculation amount.
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The Short-Term Forecast of BeiDou Satellite Clock Bias Based on Wavelet Neural Network |
Qingsong Ai,Tianhe Xu,Jiajing Li,Hongwei Xiong |
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Abstract
According to nonlinear and nonstationary characteristics of BeiDou satellite clock bias time series, this paper proposed a method using the wavelet neural network (WNN) based on the first-order difference of adjacent epoch to predict the satellite clock bias. Experimental data with sampling interval of 15 min rapid and ultra-rapid satellite clock bias provided by Wuhan University is used to test the validation of the method. The results show that the forecast precision of 6 h for BeiDou satellite can reach 1–2 ns, and the 24 h can reach 2–4.6 ns using the proposed method. The test results also show that the accuracy and stability of the model prediction can be improved greatly using the proposed method compared to the traditional gray model and quadratic polynomial model.
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Comparative Analysis of Different Filtering Methods for the Tight Integration of GPS and Strong-Moti |
Junqiang Han,Rui Tu,Qin Zhang,Guanwen Huang |
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Abstract
For the tight integration of GPS and the strong-motion records, in order to obtain high-precision co-seismic waves, the precise separation of the moving state and the baseline shift is much important and also difficult for the data solution. In this paper, the experienced CA/CV models and improved CA/CV models are analyzed, and some meaningful conclusions are got from the results comparison of different validations.
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Application of Low Cost GPS/BDS Receiver in UAV Precise Navigation and Positioning |
Lei Wang,Xiaohua Wen,Changbao Huang |
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Abstract
Recently, unmanned aerial vehicle (UAV) technology has been growing rapidly and widely used in civil applications, such as aerial mapping, precise agriculture, power line patrolling. However, most of high precision position and orientation systems (POS) are still heavy and expensive, so they are still unpractical to be equipped on UAV. In this study, we investigated the feasibility of providing precise navigation and positioning service for UAV with single frequency GPS/BDS receiver. The challenges of precise positioning for UAV with low cost receivers are threefold: (1) signal captured with low cost receivers and antennas has poorer quality and interference immunity. (2) UAV moves fast and flexible. (3) UAV navigation requires real time and high reliable positioning solution. GPS-based single frequency can provide centimeter accuracy positioning in friendly environments, while its availability and reliability is difficult to meet the requirement. In this study, we introduced GPS/BDS combined RTK positioning, which increases the redundancy number and improved the precision and reliability of float solution. Meanwhile, we analyzed the signal and antenna gain characteristics of low c
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Using the BDS-R Signal for Soil Moisture Estimation |
Xueqian Luo,Songhua Yan,Juan Shan,Hui Yan,Hao Wang |
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Abstract
BeiDou Navigation Satellite System Reflectometry (BDS-R) is an emerging area of BeiDou (BD) applications that use reflected signals in microwave remote sensing. Soil moisture (SM) estimation by using the BD GEO signals are more favorable than the GPS signals, since the fixed elevation angle, the fixed height of orbit, the fixed satellite coverage. In this study, the principle of SM measuring by BDS-R is described. First the signal-to-noise ratio (SNR) data of BD directed and reflected signals are collected though the right-hand circular polarization (RHCP) and left-hand circular polarization (LHCP) antenna, then the SNR data is extracted and the reflection coefficient is computed, at last, the variance of the reflection coefficient is calculated and the empirical model between in situ SM and the variance is established. One month of experimental data are collected at BaoXie, WuHan, and analyzed for further inversion. Experimental results show that the variance of reflection coefficient increases when SM increases and decreases when SM decreases. We can conclude that using BDS-R to retrieve SM is feasible, which will expand the application field of the BD system.
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The Potential to Estimate Soil Moisture Based on sn_rnx Data |
Juan Shan,Songhua Yan,Xueqian Luo,Xingxing Li,Hancheng Yuan |
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Abstract
Using Global Navigation Satellite System (GNSS) signals of BeiDou navigation satellite system (BDS) and global position system (GPS) for soil moisture estimation is an emerging technology in microwave remote sensing since soil moisture is an important index in regional water cycle research. Based on the developed forward multipath model, this study first investigates the feasibility of soil moisture estimation based on GNSS interference signals; then compares the difference between the Signal-to-Ratio (SNR) data and the signal strength (sn_rnx) data from GPS. After that, this paper analyzes the experimental data from BDS receivers and CORS stations. The analyzed results show that both fitted phase of BDS SNR data and GPS sn_rnx data will increase when the soil moisture increases, and the phase will decrease when soil moisture decreases, and the method of using sn_rnx data can obtain the change trend of soil moisture and can be used as an alternative to solve the problem that the SNR data is unavailable in many GNSS data sets.
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