GPS Solutions

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C/N0 estimators for high-sensitivity snapshot GNSS receivers
GPS Solutions - Tập 22 - Trang 1-11 - 2018
David Gómez-Casco, José A. López-Salcedo, Gonzalo Seco-Granados
We address the problem of estimating the carrier-to-noise ratio (C/N0) in weak signal conditions. There are several environments, such as forested areas, indoor buildings and urban canyons, where high-sensitivity global navigation satellite system (HS-GNSS) receivers are expected to work under these reception conditions. The acquisition of weak signals from the satellites requires the use of post-...... hiện toàn bộ
A preliminary evaluation of the performance of multiple ionospheric models in low- and mid-latitude regions of China in 2010–2011
GPS Solutions - - 2014
Weihua Luo, Zhizhao Liu, Min Li
Characteristic analysis and calibration of CDMA and FDMA intra-system and inter-system biases in multi-GNSS precise point positioning
GPS Solutions - Tập 27 - Trang 1-21 - 2023
Liang Chen, Zijia Wang, Fu Zheng, Xiaopeng Gong, Jun Tao, Chuang Shi
Inter-system bias (ISB) parameters are usually introduced in multi-GNSS processing. However, the differences in correlation processing within GNSS receivers can introduce signal distortion bias (SDB) into pseudorange observations. SDB differences of these satellites from the same constellation, similar to the GLONASS inter-frequency bias (IFB) related to individual frequencies, can cause intra-sys...... hiện toàn bộ
Can sea ice thickness be retrieved using GNSS-interferometric reflectometry?
GPS Solutions - Tập 26 - Trang 1-16 - 2022
Feng Wang, Dongkai Yang, Bo Zhang, Lei Yang
A method for retrieving snow and sea ice thickness is developed and simulations are conducted to evaluate the feasibility of the proposed method. When using a defined envelope amplitude and phase, for the snow-free case, RMSEs of 0.24 and 0.34 m can be obtained; for the snow-covered case, the RMSEs of the retrieved sea ice thickness decrease to 0.45 and 0.48 m, and the RMSEs of the retrieved snow ...... hiện toàn bộ
A new efficient fusion positioning method for single-epoch multi-GNSS based on the theoretical analysis of the relationship between ADOP and PDOP
GPS Solutions - Tập 26 - Trang 1-15 - 2022
Xin Liu, Qianxin Wang, Shubi Zhang, Shuhui Wu
The global navigation satellite system (GNSS) can provide single-epoch differential positioning services for geological disasters with a sudden and instantaneous nature. It needs fast and precise monitoring, which lies in the rapidly and correctly fixing ambiguities of GNSS. Compared to a single-frequency single system (SF-SS), multiple GNSSs (multi-GNSS) can achieve a high success rate (SR), but ...... hiện toàn bộ
Analysis of the upper bounds for the integer ambiguity validation statistics
GPS Solutions - Tập 18 - Trang 85-94 - 2013
Tao Li, Jinling Wang
Integer ambiguity validation is an essential quality control step for high-precision positioning and navigation with global navigation satellite systems (GNSS). In order to validate the resolved integer ambiguities, statistical tests, such as the R-ratio test, F-ratio test, W-ratio test, difference test, and projector test, have been favored. In practice, the critical values for these statistical ...... hiện toàn bộ
Assessment of PPP integer ambiguity resolution using GPS, GLONASS and BeiDou (IGSO, MEO) constellations
GPS Solutions - - 2017
Yanyan Liu, Yidong Lou, Shirong Ye, Rui Zhang, Weiwei Song, Xing Zhang, Qingquan Li
Although integer ambiguity resolution (IAR) can improve positioning accuracy considerably and shorten the convergence time of precise point positioning (PPP), it requires an initialization time of over 30 min. With the full operation of GLONASS globally and BDS in the Asia–Pacific region, it is necessary to assess the PPP–IAR performance by simultaneous fixing of GPS, GLONASS, and BDS ambiguities....... hiện toàn bộ
INS-aiding information error modeling in GNSS/INS ultra-tight integration
GPS Solutions - Tập 28 - Trang 1-16 - 2023
Wei Gao, Xingqun Zhan, Rong Yang
In the ultra-tight integration system of the global navigation satellite system/ inertial navigation system (GNSS/INS), the error models of INS aiding information are significant to analyze the performance of system. However, it is difficult to comprehensively describe the error propagation process between INS and GNSS when using the traditional transfer functions and inertial computation formulas...... hiện toàn bộ
Comprehensive classification assessment of GNSS observation data quality by fusing k-means and KNN algorithms
GPS Solutions - Tập 28 - Trang 1-14 - 2023
Mengyuan Li, Guanwen Huang, Le Wang, Wei Xie
The observation data is the basis for the global navigation satellite system (GNSS) to provide positioning, navigation and timing (PNT) service, and the observation quality directly determines the performance level of the PNT service. At present, the analysis of GNSS observations quality is partial and can only be based on a single index assessment. GNSS observation quality is difficult to analyze...... hiện toàn bộ
Assessment of the orbital variations of GNSS GEO and IGSO satellites for monitoring ionospheric TEC
GPS Solutions - Tập 27 - Trang 1-17 - 2023
Zhiyao Li, Jiahao Zhong, Yongqiang Hao, Meng Zhang, Jiemin Niu, Xin Wan, Fuqing Huang, Hao Han, Xingyan Song, Jiawen Chen
The geostationary orbit (GEO) satellites provide a great opportunity to continuously monitor the earth system, which has shown a powerful application in ionospheric total electron content (TEC) studies. As the GEO satellites revolve the earth over the equator synchronously with the earth's rotation, the GEO satellites appear motionless in the sky. In TEC studies, the position of the GEO satellites...... hiện toàn bộ
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