Precise point positioning (PPP) is one of the existing techniques for determining point coordinates using a GNSS receiver. In this technique, observations produced by a single receiver are used to determine the receiver's location as well as other parameters such as receiver clock and neutral atmosphere delay.

The GNSS Analysis and Positioning Software (GAPS) was initially developed in 2007 at the University of New Brunswick in order to provide users with a free online PPP tool capable of estimating positions and other parameters of interest. Although mainly used for positioning, GAPS was designed and built as a veritable "Swiss Army Knife" for GNSS data processing, allowing the user to estimate ionospheric and neutral atmospheric delays, receiver clock and inter-system biases, and code multipath.

For a more detailed description of GAPS and its capabilities, click here . For a list of publications about GAPS, click here

GAPS' development is an on-going project here at UNB. Work is currently being done to improve error modelling and prepare GAPS for the future of real-time PPP.

For more information or any inquiries, please contact: GAPS Development Team (gaps [at] unb.ca)