Multiple carrier correlators based carrier phase multipath mitigation technique for real time kinematic

2016 ◽  
Author(s):  
Ruan Hang ◽  
Zhang Lei ◽  
Liu Shuo ◽  
Liu Feng
Keyword(s):  
Real Time ◽  
Carrier Phase ◽  
Multipath Mitigation ◽  
Real Time Kinematic ◽  
Mitigation Technique

A Model for Combined GPS and BDS Real-Time Kinematic Positioning using one Common Reference Ambiguity

2018 ◽  
Vol 71 (4) ◽  
pp. 1011-1024 ◽  
Author(s):  
Rui Tu ◽  
Jinhai Liu ◽  
Rui Zhang ◽  
Pengfei Zhang ◽  
Xiaochun Lu
Keyword(s):  
Real Time ◽  
Global Positioning System ◽  
Carrier Phase ◽  
Satellite System ◽  
Phase System ◽  
Combined Model ◽  
Common Reference ◽  
Beidou Navigation Satellite System ◽  
Real Time Kinematic ◽  
Global Positioning

This paper proposes a model for combined Global Positioning System (GPS) and BeiDou Navigation Satellite System (BDS) Real-Time Kinematic (RTK) positioning. The approach uses only one common reference ambiguity, for example, that of GPS L1, and estimates the pseudo-range and carrier phase system and frequency biases. The validations show that these biases are stable during a continuous reference ambiguity period and can be easily estimated, and the other estimated double-differenced ambiguities, such as those of GPS L2, BDS L1, and BDS L2, are not affected. Therefore, our approach solves the problems of a frequently changing reference satellite. In addition, because all the carrier phase observations use the same reference ambiguity, a relationship is established between the different systems and frequencies, and the strength of the combined model is thus increased.

scholarly journals The Multipath Influence in Real-Time Kinematic of GNSS Observations at Different Antenna Heights

2019 ◽  
Vol 7 (2) ◽  
Author(s):  
Bakheet Agab Nour ◽  
Ahmet Turan Ozdemir ◽  
Peter Garang ◽  
Oğuzhan Ağırbaş
Keyword(s):  
Signal Processing ◽  
Real Time ◽  
Carrier Phase ◽  
Inverse Relationship ◽  
Antenna Design ◽  
Error Source ◽  
Multipath Error ◽  
Real Time Kinematic ◽  
Gnss Observations

Multipath is a dominant error source in Real-Time Kinematic (RTK) applications that reduces the position, time and velocity accuracy. Mitigation of such errors can be achieved by better signal processing and antenna design. This paper attempts to examine the different height of RTK system antenna with regards to the multipath error. The results obtained in this work show height significantly change of multipath in pseudo range (MP1) and multipath in the carrier phase (MP2). Different antenna height does not give the same multipath error result in the tests that we have conducted in this work. The optimal height of the antenna was achieved as two meters in order to obtain a minimum multipath error for   MP1 and MP2. At the end of this work, we experimentally proved that there is an inverse relationship between the height of the antenna and multipath with RTK algorithm.

Comparison between multi-constellation ambiguity-fixed PPP and RTK for maritime precise navigation

2015 ◽  
Vol 9 (2) ◽  
Author(s):  
Javier Tegedor ◽  
Xianglin Liu ◽  
Ole Ørpen ◽  
Niels Treffers ◽  
Matthew Goode ◽  
...  
Keyword(s):  
Performance Assessment ◽  
Real Time ◽  
Carrier Phase ◽  
Precise Point Positioning ◽  
High Accuracy ◽  
Reference Station ◽  
Satellite Systems ◽  
Real Time Kinematic ◽  
Gnss Data ◽  
Long Baselines

AbstractIn order to achieve high-accuracy positioning, either Real-Time Kinematic (RTK) or Precise Point Positioning (PPP) techniques can be used. While RTK normally delivers higher accuracy with shorter convergence times, PPP has been an attractive technology for maritime applications, as it delivers uniform positioning performance without the direct need of a nearby reference station. Traditional PPP has been based on ambiguity-­float solutions using GPS and Glonass constellations. However, the addition of new satellite systems, such as Galileo and BeiDou, and the possibility of fixing integer carrier-phase ambiguities (PPP-AR) allow to increase PPP accuracy. In this article, a performance assessment has been done between RTK, PPP and PPP-AR, using GNSS data collected from two antennas installed on a ferry navigating in Oslo (Norway). RTK solutions have been generated using short, medium and long baselines (up to 290 km). For the generation of PPP-AR solutions, Uncalibrated Hardware Delays (UHDs) for GPS, Galileo and BeiDou have been estimated using reference stations in Oslo and Onsala. The performance of RTK and multi-­constellation PPP and PPP-AR are presented.

scholarly journals The carrier-multipath observable: a new carrier-phase multipath mitigation technique

GPS Solutions ◽  
2014 ◽  
Vol 19 (1) ◽  
pp. 73-82 ◽  
Author(s):  
Ramin Moradi ◽  
Wolfgang Schuster ◽  
Shaojun Feng ◽  
Altti Jokinen ◽  
Washington Ochieng
Keyword(s):  
Carrier Phase ◽  
Multipath Mitigation ◽  
Mitigation Technique

Using GPS carrier phase in real time kinematic positioning

1999 ◽  
Vol 22 (2) ◽  
pp. 193-201 ◽  
Author(s):  
Hsin‐Min Peng ◽  
Fan‐Ren Chang ◽  
Li‐Sheng Wang
Keyword(s):  
Real Time ◽  
Carrier Phase ◽  
Kinematic Positioning ◽  
Real Time Kinematic

A New Method of Real-Time Kinematic Positioning Suitable for Baselines of Different Lengths

2020 ◽  
pp. 1-13
Author(s):  
Jinhai Liu ◽  
Rui Tu ◽  
Rui Zhang ◽  
Xiaodong Huang ◽  
Pengfei Zhang ◽  
...  
Keyword(s):  
Real Time ◽  
High Precision ◽  
Carrier Phase ◽  
Single Frequency ◽  
Short Baseline ◽  
Positioning Accuracy ◽  
Real Time Kinematic ◽  
Positioning Method ◽  
Wide Lane ◽  
Long Baselines

This study introduces a new real-time kinematic (RTK) positioning method which is suitable for baselines of different lengths. The method merges carrier-phase wide-lane, and ionosphere-free observation combinations (LWLC) instead of using pseudo-range, and carrier-phase ionosphere-free combination (PCLC), or single-frequency pseudo-range and phase combination (P1L1). In a first step, the double-differenced wide-lane ambiguities were calculated and fixed using the pseudo-range and carrier-phase wide-lane combination observations. Once the double-differenced wide-lane integer ambiguities were known, the wide-lane combined observations were regarded as accurate pseudo-range observations. Subsequently, the carrier-phase wide-lane, and ionosphere-free combined observations were used to fix the double-differenced carrier-phase integer ambiguities, achieving the final RTK positioning. The RTK positioning analysis was performed for short, medium, and long baselines, using the P1L1, PCLC, and LWLC methods, respectively. For a short baseline, the LWLC method demonstrated positioning accuracy similar to the P1L1 method, and performed better than the PCLC method. For medium and long baselines, the positioning accuracy of the LWLC method was slightly higher than those of the PCLC and P1L1 methods. In conclusion, the LWLC method provided high-precision RTK positioning results for baselines with different lengths, as it used high-precision carrier-phase observations with fixed ambiguities instead of low-precision pseudo-range observations.

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