Global Navigation Satellite Systems (GNSS); Analysis of achievable accuracies in Precise Point Posit

Jul 27th, 2016
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Global Navigation Satellite Systems (GNSS); An analysis of the achievable accuracies in Ireland from online Precise Point Positioning (PPP) post-processing services; All horizontal positions computed by the PPP online services were within one centimetre of the known D147 coordinates. The vertical positions were no larger than three centimetres; this was considered acceptable as vertical accuracy is generally 2-3 times less accurate; Trimble RTX tended to produce the most accurate results and proved to be the most reliable in the vertical component. Thus PPP has proven to be a suitable alternative technique to establish control; X= (v+h)cosφcosλ Eq. 10 Y=(v+h)cosφsinλ Eq. 11 Z=((1- e^2 )v+h)sinφ Eq. 12

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An analysis of the achievable accuracies in Ireland from online PrecisePoint Positioning (PPP) post-processing servicesKevin O Mahony, BSc (Hons) GeomaticsSupervisor: Dr. Audrey Martin FRICS FSCSISpatial Information Sciences Group,College of Engineering and Built Environment,Dublin Institute of Technology, IrelandSUMMARYGlobal Navigation Satellite Systems (GNSS) are a powerful tool for modern surveying,capable of computing highly accurate coordinates. Survey techniques such as Differential(D)GNSS, Real Time Kinematic (RTK) and Static are currently frequently used in Ireland butrely heavily on established national survey infrastructure. A possible infrastructural-lightalternative to these techniques is Precise Point Positioning (PPP). Compared to traditionaltechniques, PPP does not require observations from a reference station, as it uses moreprecise satellite orbital information, and therefore requires less national surveyinfrastructure. There is, however, a lack of information available concerning the accuraciesobtainable from PPP in Ireland.In recent years, several international free post processing services have been developed toprocess PPP solutions including: CSRS-PPP; AUSPOS; OPUS; Magic GNSS; GAPS; APPSand Trimble RTX). This research outlines an effective methodology for using these onlineservices and transforming resulting computed coordinates from International TerrestrialReference Frame (ITRF) to the Irish Transverse Mercator (ITM). Fu

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