Examining the C1-P1 Pseudorange Bias
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Pseudorange
Code (set theory)
Baseline (sea)
Pseudorange
Smoothing
SIGNAL (programming language)
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Accuracy of GPS positioning has been widely distributed with the technique of GPS positioning. Various techniques of GPS positioning have been developing with working characteristic and requirement accuracy. Specially, real-time GPS positioning that is performed with the real-time corrections for code pseudorange or carrier phase is widely used in many applications. In this study, The RF communication system was used to correct GPS observables with transmitting and receiving correction data of RTCM SC-104 format. In case of the real- time correction for carrier phase, OTF(On-The-Fly) technique was used to resolve integer ambiguity for carrier phase. By these, I estimated the accuracy of GPS positioning according to real-time correction of code pseudorange or carrier phase and analysis the cause of error. Also, I suggested effective of real-time GPS positioning with pen computer system expressing real-time positioning on digital map.
Pseudorange
GPS disciplined oscillator
Code (set theory)
GPS/INS
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Pseudorange
Precise Point Positioning
Interpolation
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An observability analysis of terrestrial receiver localization via pseudorange measurements extracted from a single low Earth orbit (LEO) satellite is presented. It is concluded that a stationary receiver with an unknown state (position and time) can localize itself with measurements from a LEO satellite with a known state (position, velocity, and time). In addition, bounds on the determinant of the observability matrix are derived. The relationship between the satellite’s relative orbital inclination angle and geometric diversity of the line-of-sight vectors from the receiver to the satellite is analyzed, leading to geometric interpretations indicating directions of poor observability. Experimental results are presented showcasing the conclusions of the observability analysis for a receiver localizing itself with a single Starlink LEO satellite or a single Orbcomm LEO satellite. Finally, an observability-aided LEO satellite selection strategy is discussed.
Observability
Pseudorange
Position (finance)
Line-of-sight
Dilution of precision
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The accuracy of C/A code,P1-code and P2-code pseudorange is a puzzling problem.For the purpose of clarifying the problem,an experiment using the real observation values of zhengzhou J3JG Station is made.The results of the experiment indicate that the accuracy of the three kinds of pseudorang is in the order of P1-code,C/A-code and P2-code from high level to low level.In order to improve the positioning accuracy of P1-code pseudorange,it is smoothed by carrier phase.By the self-developed GPS point positioning program,it studies and verifies the positioning accuracy of carrier phase smoothed P1-code pseudorange.
Pseudorange
Code (set theory)
Precise Point Positioning
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의사거리는 GPS 수신기의 위치를 결정하기 위한 오차를 포함해 측정된 GPS 위성과 수신기 사이의 거리이다. 재방송 재밍기는 GPS 수신기에 가까이 있을 때 효과적으로 동작한다. 본 논문에서는 재방송 재밍의 원리를 효과적으로 이해하기 위해 근접한 GPS 수신기의 의사거리 차를 분석한다. Pseudorange is the pseudo distance between a GPS satellite and a GPS receiver to determine the receiver's position. The closer the distance between jammer and victim receiver is, the more effective a repeat-back jamming is. In this letter, we analyze the pseudorange difference between adjacent GPS receivers using real GPS pseudorange data to understand the effects by the repeat-back jamming.
Pseudorange
GPS disciplined oscillator
GPS/INS
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Based on Summing up the quality assessment indexes for GPS baseline solution,this paper probes into some factors influencing the quality of GPS baseline solution,and puts forward some measures for controlling the quality of GPS baseline solution for improving the quality of GPS baseline solution as more as possible in the production,obtaining reliable solution of the control network,and increasing the efficiency of GPS measurement.
Baseline (sea)
Control network
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Pseudorange
GPS disciplined oscillator
Mode (computer interface)
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Pseudorange is one of the basic range measurements for GPS receiver,having the significant effect on the navigation accuracy.Positioning accuracy can be improved if some ways can be found to enhance the accuracy of pseudorange.Carrier phase smoothed pseudorange is one simple and effective method to improve pseudorange accuracy.This article advanced one Code Pseudorange Smoothing algorithm based on the smoothing principle,and analysed the relationship between smoothing effect and smoothing window or cycle-slip detection door values.In the case of high dynamic datas,the reasonable value of parameters were determined,followed by positioning and pseudorange accuracy improving analysis.Finally,the article analysed from a statistical point of view the relationship between carrier phase、pseudorange and smoothed pseudorange.The results of experiment indicate that this algorithm can improve the accuracy of pseudorange measurement.This is very meaningful to accurate position and navigation of GNSS receiver.
Pseudorange
Smoothing
Code (set theory)
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Satellite chip shape distortions lead to signal tracking errors in pseudorange measurements, which are related to the receiver manufacturers, called receiver-related pseudorange biases. Such biases will lead to adverse effects for differential code bias (DCB) and satellite clock estimation, single point positioning (SPP) and precise point positioning (PPP) applications with pseudoranges. In order to assess the characteristics of receiver-related pseudorange biases for global positioning system (GPS), Galileo navigation satellite system (Galileo) and BeiDou navigation satellite system (BDS), seven short baselines from the Multi-GNSS experiment (MGEX) network are tested. The results demonstrate that there are significant inconsistences of pseudorange biases according to satellites, frequencies, receiver and antenna types. For the baselines using the same receivers of TRIMBLE, pseudorange biases are within ±0.2 ns with the same antennas, while they increase to ±0.6 ns with the different antennas. As for baselines with mixed receiver types, pseudorange biases can reach up to 2.5 ns. Among GPS/Galileo/BDS, Galileo shows the smallest pseudorange biases, and the obvious inconsistences of pseudorange biases are observed between BDS-2 and BDS-3, and Galileo in-orbit validation (IOV) satellites and full operational configuration (FOC) satellites. In order to validate receiver-related pseudorange biases, we carry out relative positioning experiments using short baselines. The results show that the RMS values of position errors are reduced 12.6% and 11.4% in horizontal and vertical components with biases correction. The impacts of receiver-related pseudorange biases on wide-lane (WL) ambiguity are also discussed. The results indicate that the percentage of the fractional parts within ±0.1 cycles have an obvious increase with the pseudorange biases correction, and RMS values of the fractional parts are reduced 28.9% and 67.6% for GPS and BDS, respectively.
Pseudorange
Ambiguity Resolution
Precise Point Positioning
Galileo (satellite navigation)
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