Reference stations for Christchurch

A Parallel Particle Swarm Optimization Algorithm for Reference Stations Distribution

Parallel Particle Swarm Optimization (PPSO) algorithm is proposed to optimize the reference stations distribution and this algorithm will increase the User Differential Range Error (UDRE) accuracy and enhance the flight safety. Due to the reference stations distribution largely influence the accuracy of UDRE, a concept of Satellite Surveillance Dilution of Precision (SSDOP) is used to reflect t...

GPS with Multiple Reference Stations: Surveying Scenarios in Metropolitan Areas

The standard scenario for GPS surveying is to use two carrier phase-tracking GPS receivers, one located at a "reference" station with known coordinates and the second one at a station whose coordinates are to be determined. (It is also possible to determine a trajectory when the second receiver is in motion.) However, the cost of two GPS receivers, and associated software, is high and has precl...

Achievable Positioning Accuracies in a Network of GNSS Reference Stations

Carrier Phase Multipath Calibration of GPS Reference Stations

Based on available GPS reference network observations we developed, implemented and tested a procedure to estimate carrier phase multipath corrections. This procedure consists of three steps: detection and localization of multipath affected satellite signals, daily estimations of multipath errors, and combination of these daily estimates to corrections for undifferenced L1 and L2 phase measurem...

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