Results 161 to 170 of about 20,060,135 (189)

Mixed GPS–BeiDou RTK with inter-systems bias estimation aided by CSAC

GPS Solutions, 2017
It is now common to use multiple GNSS constellations (multi-GNSS) for precise positioning. When GPS and BeiDou satellites are used in real-time kinematic GNSS (RTK-GNSS), the normal approach is to construct separate sets of double differences for each satellite constellation. Since QZSS is designed to be the same as GPS in terms of frequency and timing,
Nobuaki Kubo, Hiroko Tokura, Sam Pullen
openaire   +1 more source

Application of Inter-system Hardware Delay Bias in GPS/GLONASS PPP

2012
GPS applies Code Division Multiple Access technique in signal coding, while GLONASS’s signal is produced with Frequency Division Multiple Access technique. The differences in signal frequency results in inter-system hardware delay bias for GPS/GLONASS receivers.
Xiao Pei, Junping Chen, Jiexian Wang, Yize Zhang, Haojun Li   +4 more
openaire   +1 more source

Tightly combined GPS + GLONASS positioning with consideration of inter-system code bias and GLONASS inter-frequency code bias

Journal of Navigation, 2019
Inter-system code double differencing is an effective method for improving the positioning accuracy of low-cost receivers in complex environments. Due to the adoption of Frequency Division Multiple Access (FDMA), Globalnaya Navigazionnaya Sputnikovaya Sistema (GLONASS) code observations are affected by the Inter-Frequency Code Biases (IFCBs), which ...
Rui Shang, Chengfa Gao, Shuguo Pan, Xiaolin Meng, Wang Gao   +4 more
openaire   +1 more source

Determining inter-system bias of GNSS signals with narrowly spaced frequencies for GNSS positioning

Journal of Geodesy, 2017
Relative positioning using multi-GNSS (global navigation satellite systems) can improve accuracy, reliability, and availability compared to the use of a single constellation system. Intra-system double-difference (DD) ambiguities (ISDDAs) refer to the DD ambiguities between satellites of a single constellation system and can be fixed to an integer to ...
Yumiao Tian, Zhizhao Liu, Maorong Ge, Frank Neitzel   +3 more
openaire   +3 more sources

BDS-2/BDS-3 combined precise time-frequency transfer with different inter-system bias estimation strategies and different analysis centres products

Measurement Science and Technology, 2021
Abstract BeiDou-3 global navigation satellite system (BDS-3) has officially provided positioning, navigation, and timing (PNT) services on 31 July 2020. The difference between BDS-2 and BDS-3 in signal modulation mode, signal characteristics, and satellite clock datum leads to the possible existence of inter ...
Wei Xu, Chao Yan, Jian Chen
openaire   +1 more source

GNSS inter-system bias estimation, modeling, and prediction

2019
In den vergangenen 20 Jahren hat sich das Precise-Point-Positioning (PPP) vom Single-System-Modus zu einer Multi-GNSS-Kombination entwickelt. Der entscheidende Punkt bei Multi-GNSS-integrierten PPPs ist dabei die sorgfältige Kalibrierung des sogenannten Inter-System-Bias (ISB) zwischen den verschiedenen Systemen.
openaire   +1 more source

THE STABILITY OF INTER-SYSTEM BIAS OVER TIME FOR POSITIONING USING GPS AND GALILEO

GIS Odyssey Journal
The introduction of new overlapping signals from GPS and Galileo, such as L1 and E1 and L5 and E5a, presents new opportunities for enhanced precision and reliability in positioning. However, it also introduces new challenges that need to be addressed. One of the primary challenges in processing GPS and Galileo observations is the requirement for Inter ...
Kwaśniak, Dawid, Cellmer, Sławomir
openaire   +1 more source

Tightly combined GPS and GLONASS for RTK positioning with consideration of differential inter-system phase bias

Measurement Science and Technology, 2019
Abstract A tightly combined inter-system model between two global navigation satellite systems can improve the performance of real-time kinematic (RTK) positioning, if the associated differential inter-system biases (DISBs) are processed well, especially for the severely obstructed environment. In recent years, tightly combined models
Wang Gao, Shuguo Pan, Chengfa Gao, Qing Wang, Rui Shang   +4 more
openaire   +1 more source

Particle filter-based estimation of inter-system phase bias for real-time integer ambiguity resolution

GPS Solutions, 2016
Although double-differenced (DD) observations between satellites from different systems can be used in multi-GNSS relative positioning, the inter-system DD ambiguities cannot be fixed to integer because of the existence of the inter-system bias (ISB). Obviously, they can also be fixed as integer along with intra-system DD ambiguities if the associated ...
Tian, Y., Ge, M., Neitzel, F., Zhu, J.
openaire   +3 more sources

Single-Frequency GNSS-Based Measurement-Domain Attitude Determination Algorithm with Inter-system Bias Calibration

2020
Under satellite-deprived environments, the accuracy and continuity of the traditional GNSS-based attitude determination methods would be degraded. In this contribution, we derive the tightly coupled measurement-domain approach for single-frequency attitude determination, which could improve the performance of ambiguity resolution and attitude ...
Jingze Li, Liang Li, Jiachang Jiang, Chun Jia, Lin Zhao   +4 more
openaire   +1 more source