EVALUATION PRACTICE ON AIRBORNE GPS DATA QUALITY

Author: Jiyu, Liu

Source: Survey Review, Volume 36, Number 284, April 2002 , pp. 463-469(7)

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Abstract:

Since July 1,1991 the GPS signals transmitted by each satellite have been activated by the Selective Availability (SA) techniques that mean unauthorized users can only acquire 120m-accuracy qf real-time positions. To match air photogrammetric engineering we have developed successffully an airborne GPS kinematic carrier phase measurement technique, with new software based on the Kalman filter processing for pseudorange/double difference data of carrier phase measurements, and can complete the ambiguity resolution On The Fly(0TF) on the carrier phase measurements, defining as DDKlN software. DDKlN was used to solve precisely for seven dimension state parameters of 10 types of aircraft making over 200 flights between 1994 and 2000. It is known from the analysis using 103 ground geodetic controls with millimetre accuracy, that the coordinate accuracies of Trimble 4000SST receiver installed in the aircraft have achieved ± 7.9 cm for 2D positions and ± 18.1 cm for heights above the ground. This paper discusses only three evaluations: kinematic figuration check, flight velocity evaluation and dual initialization evaluation.

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/003962602791483163

Publication date: 2002-04-01

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