The Canadian Spatial Reference System (CSRS) Precise Point Positioning (PPP) service provides post-processed position estimates over the Internet from GPS observation files submitted by the user.

Precise position estimates are referred to the CSRS standard North American Datum of 1983 (NAD83) as well as the International Terrestrial Reference Frame (ITRF). Single station position estimates are computed for users operating in static or kinematic modes using precise GPS orbits and clocks.

The online PPP positioning service is designed to minimize user interaction while providing the best possible solution for the given observation availability. Currently, users need only specify the mode of processing -- static or kinematic -- and the reference frame for position output -- NAD83(CSRS) or ITRF.

The observations processed are selected from the submitted RINEX file in the following order:

1. L1 and L2 pseudo-range and carrier phase observations
2. L1 pseudo-range observation

An L1 pseudo-range only solution will be performed in case of failure of the L1 and L2 pseudo-range and carrier phase solution. Failure to detect one of the above two observation sets results in an unsuccessful job termination.