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
Attitude determination by integration of MEMS inertial sensors and GPS for autonomous agriculture applications
GPS Solutions - Tập 16 - Trang 41-52 - 2011
Yong Li, Mahmoud Efatmaneshnik, Andrew G. Dempster
Integration of Global Positioning System (GPS) and Inertial Navigation System (INS) technologies, which has widespread usage in industry, is also regarded as an ideal solution for automated agriculture because it fulfils the accuracy, reliability and availability requirements of industrial and agricultural applications. Agriculture applications use position, velocity and heading information for au... 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
On the temperature sensitivity of multi-GNSS intra- and inter-system biases and the impact on RTK positioning
GPS Solutions - Tập 24 - Trang 1-14 - 2020
Xiaolong Mi, Baocheng Zhang, Robert Odolinski, Yunbin Yuan
The intra-system biases, including differential code biases (DCBs) and differential phase biases (DPBs), are generally defined as the receiver-dependent hardware delays between different frequencies in a single global navigation satellite system (GNSS) constellation. Likewise, the inter-system biases (ISBs) are the differential code and phase hardware delays between different GNSSs, which are of g... hiện toàn bộ
On the accuracy of the GPS L2 observable for ionospheric monitoring
GPS Solutions - Tập 22 - Trang 1-7 - 2017
Anthony M. McCaffrey, P. T. Jayachandran, Richard B. Langley, Jean-Marie Sleewaegen
The introduction of the unencrypted global positioning system (GPS) L2 civil (L2C) signal has the potential to improve measurements made with the L2 frequency, an important observable in GPS-based ionospheric research and monitoring. Recent work has shown significant differences between the legacy L2P(Y) and L2C-derived total electron content rate of change index (ROTI). This difference is observe... 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
Improved time-differenced cycle slip detect and repair for GNSS undifferenced observations
GPS Solutions - Tập 22 - Trang 1-13 - 2017
Guorui Xiao, Michael Mayer, Bernhard Heck, Lifen Sui, Tian Zeng, Dongming Zhao
GNSS undifferenced signal processing, in which the individual signal of each frequency is treated as independent observable, has drawn increasing interest in GNSS community. However, undifferenced signal processing brings new challenges for cycle slip detection and repair. One important feature is the carrier frequency identification of cycle slips since observations are processed separately. An a... 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
Offsets in the EPN station position time series resulting from antenna/radome changes: PCC type-dependent model analyses
GPS Solutions - Tập 27 - Trang 1-15 - 2022
K. Dawidowicz, G. Krzan, P. Wielgosz
The EUREF Permanent Network (EPN) currently consists of more than 300 evenly distributed continuously operating Global Navigation Satellite System (GNSS) reference stations. As a result of the continuous modernization of GNSS systems, the equipment of reference stations is subject to changes and upgrades. Changes relating to GNSS receiver antenna replacement are considered the main reason for disc... hiện toàn bộ
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