• Corpus ID: 16158712

Tropospheric Correction for Locata when Known Point ambiguity resolution technique is used in Static Survey- Is it required?

  title={Tropospheric Correction for Locata when Known Point ambiguity resolution technique is used in Static Survey- Is it required?},
  author={Mazher Choudhury and Bruce Harvey and Chris Rizos},
Locata‟s positioning technology provides positioning solutions via a network of time synchronised ground-based “pseudolite” transceivers which can operate where GNSS is challenged. However, as Locata‟s signal propagates through the lowest atmospheric layer, tropospheric error effects are different from the case of GNSS and should be modelled properly. The aim of this research is to analyse published tropospheric delay models and propose an appropriate model for Locata. Tropospheric delay models… 
Precise point positioning for ground-based navigation systems without accurate time synchronization
A new precise point positioning method that does not rely on accurate inter-station time synchronization is proposed, and a new “dynamic key point initialization” method is proposed to overcome the limitations of the Locata on-the-fly algorithm and the conventional “known-point initialization’ method.
Kinematic ME-MAFA for Pseudolite Carrier-Phase Ambiguity Resolution in Precise Single-Point Positioning
A computing method of the success rate for the kinematic multi-epoch MAFA (kinematic ME-MAFA) algorithm is proposed to improve the model strength of the MAFA and to eliminate the influence of constant multipath biases on the time-average model in static mode.
Indoor precise point positioning with pseudolites using estimated time biases iPPP and iPPP-RTK
The global navigation satellite system (GNSS) provides outstanding positioning services for outdoor activities with sufficient accuracies, but it has poor indoor performance. Indeed, indoor
Background and Recent Advances in the Locata Terrestrial Positioning and Timing Technology
Global Navigation Satellite System (GNSS) is the most widely used Positioning, Navigation, and Timing (PNT) technology in the world today, but it suffers some major constraints. Locata is a
Locata-based precise point positioning for kinematic maritime applications
The results confirm that the Locata/GPS-PPP approach can achieve centimeter-level accuracy for horizontal positioning which improves 36.4 and 68.8 % over Locata-SPP and GPS- PPP.
Ground-based PPP-RTK for pseudolite systems
Global navigation satellite systems (GNSS) can provide high-accuracy positioning services in the open environment, while they have poor performance in shadowed regions. Pseudolite (PL) systems, with
Inter-Pseudolite Range Augmented GNSS PPP Navigation for Airborne Pseudolite System
Ground-based pseudolite navigation systems have several limitations, such as low vertical accuracy, susceptibility to multipath effects, and near-far signal problems. These limitations could be
Correction of fractional cycle bias of pseudolite system for user integer ambiguity resolution
Synchronized pseudolite systems allow single-point positioning (SPP) using carrier-phase measurements with centimeter-level accuracy. Locata, developed by the Locata Corporation, emerged from the
Test Results of Locata Technology for Deformation Monitoring
SUMMARY Deformation monitoring requires very high levels of precision as well as accuracy. Although GNSS is a popular choice for 24/7 deformation monitoring applications, it suffers from interference
Optimal Data Fusion Algorithm for Navigation Using Triple Integration of PPP-GNSS, INS, and Terrestrial Ranging System
A robust georeferencing system that could satisfy centimeter-level accuracy requirements in port environments is described and three integration algorithms are investigated and implemented into a triple-integrated PPP-GNSS/Locata/INS integrated system.


Tropospheric Delay Estimation for Pseudolite Positioning
The objective of this research is to analyse pseudolite tropospheric delay modelling methods and to select the optimal tropospherical delay models for different applications.
Locata: A New Positioning Technology for High Precision Indoor and Outdoor Positioning
The experiments demonstrate proof-of-concept for the “Locata technology” and show that carrier-phase point positioning (without radio modem data-links) is possible with sub-centimetre precision.
Development of an APL Error Model for Precision Approaches and Validation by Flight Experiments
The use of the APL error model in connection with a carefully selected ground and aircraft antenna site design results in an improvement of positioning precision.
Methods for Aiding Height Determination in Pseudolite-Based Reference Systems Using Batch Least-Squares Estimation
Abstract : There are many situations in which GPS is either unable to provide the desired level of accuracy or is unavailable. Use of a pseudolite-based reference system for navigation can be a means
Refractive Index Formulae for Radio Waves
The radio refractive index formula adopted in 1963 by the International Union of Geodesy and Geophysics (IUGG) and the International Association of Geodesy (IAG) is being reviewed. Forty years ago,
GNSS Based Precision Approach Local Area Augmentation System (LAAS)-Signalin-Space Interface Control Document (ICD)
  • RTCA/DO-246A, Radio Technical Commission for Aeronautics
  • 2000
Adopted by the International Association of Geodesy IAG at 22 nd General Assembly
  • IAG
  • 1999
Local Differential Tropospheric Delay Corrections
  • Internal Memo for RTCA Special Committee 159 Working Group
  • 1997
Local Differential Tropospheric Delay Corrections. Internal Memo for RTCA Special Committee 159 Working Group 4
  • Local Differential Tropospheric Delay Corrections. Internal Memo for RTCA Special Committee 159 Working Group 4
  • 1997