Test Results from a New 2 cm Real Time Kinematic GPS Positioning System

Abstract

This paper presents test results from the new RT2 realtime carrier phase positioning system developed by NovAtel. The single frequency carrier phase positioning technology introduced in 1994 as RT20 has now been expanded to take advantage of the dual frequency capability recently introduced. The objective in developing this system was to add to the technology used in RT20, retaining its advantages while adding dualfrequency algorithms to speed initialization time, improve short baseline accuracy by using fixed integer ambiguity estimates, and extend the range of usable baseline lengths with ionospheric corrections. This paper fust provides a brief description of the measurement processing used for various baseline lengths. Testing methods are then described and results are presented describing integer resolution speed, positioning accuracy and performance during poor radio coverage.