Satellite Differential Code Bias Estimated Using EGYNET: A Local Egyptian Permanent Network

2020 ◽  
Vol 19 (6) ◽  
pp. 453-459
Author(s):  
Mohammed A. Abid ◽  
Ashraf Mousa
Keyword(s):  
Gps Data ◽  
Gps Receiver ◽  
Gps Receivers ◽  
Differential Code Bias ◽  
Gps Satellites ◽  
Four Seasons ◽  
Algorithm Operation ◽  
Code Bias ◽  
Comparison Of The Results ◽  
Gps Station

This paper proposes to determine the GPS satellites DCB using nine GPS receivers located in the middle of Egypt. During four seasons and 36 days characterized by quiet geomagnetism, the performance of the proposed method is examined. The dual GPS data selected is used and applied to the GPS receiver chain notes. The Bernese program V.5 is used to estimate DCBs from the data of a single GPS station where the results of the algorithm operation are compared to the CODE DCB data and the main differences in GLONASS data are recorded. According to the comparison of the results between the proposed method and the currently existing methods, it can be shown that the accuracy of the DCB estimates is at a level of about 0.31 and 0.17 ns.

scholarly journals Quantification of the Accuracy of Low Priced GPS Receivers for Crash Location

2010 ◽  
Author(s):  
Thobias Sando ◽  
Renatus Mussa ◽  
John Sobanjo ◽  
Lisa Spainhour
Keyword(s):  
Global Positioning System ◽  
Time Of Day ◽  
Gps Data ◽  
Positioning System ◽  
Gps Receiver ◽  
Accuracy Improvement ◽  
Gps Receivers ◽  
Location Data ◽  
Global Positioning ◽  
Potential Tool

Global positioning system (GPS) has been identified as a potential tool for capturing crash location data. This study quantifies factors that could affect the accuracy of GPS receivers. The results showed that GPS receiver orientation, site obstructions, and weather have significant effects on the accuracy of GPS receivers. Time of day and number of satellites were not found to significantly affect the accuracy of GPS receivers. HDOP values of 1.2 or less were found to be adequate for crash location purposes. An accuracy improvement of 20.7% was realized by filtering GPS data based on HDOP values.

Differential Code Bias of GPS Receivers in Low Earth Orbit: An Assessment for CHAMP and SAC-C

2005 ◽  
pp. 465-470 ◽  
Author(s):  
Stefan Heise ◽  
Claudia Stolle ◽  
Stefan Schlüter ◽  
Norbert Jakowski
Keyword(s):  
Low Earth Orbit ◽  
Earth Orbit ◽  
Gps Receivers ◽  
Differential Code Bias ◽  
Code Bias

scholarly journals GPS Meteorology : Error in the estimation of precipitable water by ground based GPS system in some meso-scale thunderstorms - A case study

MAUSAM ◽  
2021 ◽  
Vol 71 (2) ◽  
pp. 175-186
Author(s):  
PUVIARASAN N ◽  
YADAV RAMASHRAY ◽  
GIRI R K ◽  
SINGH VIRENDRA
Keyword(s):  
Atmospheric Condition ◽  
Mapping Function ◽  
Precipitable Water ◽  
Heavy Rain ◽  
Gps Receiver ◽  
Squall Lines ◽  
Gps Satellites ◽  
Gps System ◽  
Gps Station

Remote sensing by ground based GPS receivers provide continuous and accurate measurement of precipitable water (PW) of an order of 1.5 mm comparable to radiosondes and water vapour radiometers.  In the present work we have examined the amount of PW variation in three thunderstorms accompanied with rain shower that occurred over the GPS station.  In all the three thunderstorms event heavy rain was reported.  However on comparison of observed rainfall with GPS estimated precipitable water (hourly) in real time, it is observed that among the three, in one event the amount of precipitable water (PW) is much less (~20mm) for the same amount of rainfall.  After analysing and taken into account various source of error, we suspect that in a mesoscale thunderstorms or squall lines associated with heavy rainfall, discrepancies arise because the wet mapping functions that used to map the wet delay at any angle to the zenith do not represent the localized atmospheric condition particularly for narrow towering thunder clouds and non-availability of GPS satellites in the zenith direction.  On the other hand for the larger thunder cells the atmosphere is very nearly azimuthally symmetric with respect to GPS receiver, the error due to the wet mapping function is minimal.

Simultaneous estimation of ionospheric delays and receiver differential code bias by a single GPS station

2012 ◽  
Vol 23 (6) ◽  
pp. 065002 ◽  
Author(s):  
Kwang Ho Choi ◽  
Je Young Lee ◽  
Hee Sung Kim ◽  
Jeongrae Kim ◽  
Hyung Keun Lee
Keyword(s):  
Simultaneous Estimation ◽  
Differential Code Bias ◽  
Code Bias ◽  
Gps Station

GPS Receiver Demonstration on a Galileo Test Bed Satellite

2007 ◽  
Vol 60 (3) ◽  
pp. 349-362 ◽  
Author(s):  
Takuji Ebinuma ◽  
Martin Unwin
Keyword(s):  
Low Earth Orbit ◽  
The Other ◽  
Earth Orbit ◽  
Gps Receiver ◽  
Test Bed ◽  
Gps Receivers ◽  
Preliminary Results ◽  
The Earth ◽  
Gps Satellites ◽  
Leo Satellite

GPS receivers have been used successfully on low Earth orbit (LEO) satellite missions for several years. The use of a GPS receiver at altitudes higher than LEO, however, is non-trivial as the receiver will be outside the main lobe of the GPS broadcast signals, and it will have to track signals from GPS satellites transmitting from the other side of the Earth. This paper will review the special hardware and software adaptations required for GPS receiver operations on a medium Earth orbit or geostationary satellite, along with preliminary results from simulations and an in-orbit experiment.

scholarly journals The Effect of BDS-3 Time Group Delay and Differential Code Bias Corrections on Positioning

2020 ◽  
Vol 11 (1) ◽  
pp. 104
Author(s):  
Peipei Dai ◽  
Jianping Xing ◽  
Yulong Ge ◽  
Xuhai Yang ◽  
Weijin Qin ◽  
...  
Keyword(s):  
Group Delay ◽  
Assessment System ◽  
Convergence Time ◽  
Single Frequency ◽  
Positioning Accuracy ◽  
Differential Code Bias ◽  
Receiver Clock ◽  
Code Bias ◽  
Point Positioning ◽  
The Impact

The timing group delay parameter (TGD) or differential code bias parameter (DCB) is an important factor that affects the performance of GNSS basic services; therefore, TGD and DCB must be taken seriously. Moreover, the TGD parameter is modulated in the navigation message, taking into account the impact of TGD on the performance of the basic service. International GNSS Monitoring and Assessment System (iGMAS) provides the broadcast ephemeris with TGD parameter and the Chinese Academy of Science (CAS) provides DCB products. In this paper, the current available BDS-3 TGD and DCB parameters are firstly described in detail, and the relationship of TGD and DCB for BDS-3 is figured out. Then, correction models of BDS-3 TGD and DCB in standard point positioning (SPP) or precise point positioning (PPP) are given, which can be applied in various situations. For the effects of TGD and DCB in the SPP and PPP solution processes, all the signals from BDS-3 were researched, and the validity of TGD and DCB has been further verified. The experimental results show that the accuracy of B1I, B1C and B2a single-frequency SPP with TGD or DCB correction was improved by approximately 12–60%. TGD will not be considered for B3I single-frequency, because the broadcast satellite clock offset is based on the B3I as the reference signal. The positioning accuracy of B1I/B3I and B1C/B2a dual-frequency SPP showed that the improvement range for horizontal components is 60.2% to 74.4%, and the vertical components improved by about 50% after the modification of TGD and DCB. In addition, most of the uncorrected code biases are mostly absorbed into the receiver clock bias and other parameters for PPP, resulting in longer convergence time. The convergence time can be max increased by up to 50% when the DCB parameters are corrected. Consequently, the positioning accuracy can reach the centimeter level after convergence, but it is critical for PPP convergence time and receiver clock bias that the TGD and DCB correction be considered seriously.

scholarly journals A Bridge Deflection Monitoring with GPS

2007 ◽  
Vol 42 (4) ◽  
pp. 229-238 ◽  
Author(s):  
M. Figurski ◽  
M. Gałuszkiewicz ◽  
M. Wrona
Keyword(s):  
Interdisciplinary Approach ◽  
High Rate ◽  
Gps Data ◽  
Bridge Management ◽  
Technology Research ◽  
Traffic Loading ◽  
Gps Receivers ◽  
The Road ◽  
University Of Technology ◽  
Compute Data

A Bridge Deflection Monitoring with GPSThis paper introduces results of investigation carried on by The Applied Geomatics Section in Military University of Technology. Research includes possibilities of monitoring dynamic behavior of a bridge using high rate GPS data. Whole event was executed with collaboration of The Road and Bridge Management and The Warsaw Geodesy Company. Interdisciplinary approach with this project allows authors to get reliable information about investigating constructions and their respond for true traffic loading detected by GPS receivers. Way of compute data and used software (TRACK) are also shown in this paper.

Performance Analysis of GPS/BDS Precise Point Positioning

2015 ◽  
Vol 713-715 ◽  
pp. 1123-1126
Author(s):  
Xiao Yu Li ◽  
Jun Wang ◽  
Ya Tao Liu
Keyword(s):  
Precise Point Positioning ◽  
Satellite Orbit ◽  
Gps Measurements ◽  
Differential Code Bias ◽  
Phase Offset ◽  
Antenna Phase ◽  
Offset Correction ◽  
Code Bias ◽  
Point Positioning ◽  
Processing Steps

Precise Point Positioning (PPP) with GPS measurements has achieved a level of success. In order to benefit from the multiple available constellations, research has been undertaken to combineGPS and BDS measurements in PPP processing.Mathematical models of GPS/BDS combined precise point positioning are introduced in this paper. GPS/BDS combined PPP models are developed based on the GPS-only PPP. The data pre-processing steps include applying satellite orbit and clock corrections, satellite antenna phase offset correction, receiver antenna phase offset correction, differential code bias corrections, troposphere delay corrections and the the Ionosphere-free observation combination is used. The results show that the positioning precision and convergence speed of GPS/BDS combined PPP are improved compared with GPS-only PPP.

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