We have just made available online the first version of the COMP module. COMP is envisaged to be a flexible tool to compare many types of GNSS data products such as orbits, clocks, and coordinates.

With the current version of COMP you can inter-compare estimated and predicted satellite orbits (in SP3 format) generated by the ODTS algorithm, and also compare them with IGS products.

IGS ultra-rapid, rapid and final orbits are automatically downloaded and stored on the magicGNSS server. Rapid IGS orbits have a latency of around 2 days and final orbits have a latency of nearly two weeks. When comparing with IGS orbits, COMP tries always to choose the final IGS orbit, and if it is not available it chooses the rapid or ultra-rapid one instead.

Here is an example of COMP report for orbit comparison. For a quick evaluation of your orbit comparison you can go straight to the last plot on the report where you can find the RMS statistics for all the GPS satellites:

The previous plot shows a typical comparison between magicGNSS orbits and IGS rapid orbits. The RMS difference for all GPS satellites (right, “All”) is typically 2 cm in the radial direction, 4 cm in the normal direction, and 6 cm in the along direction.

This entry was posted on Wednesday, December 10th, 2008 at 12:07 pm and is filed under Announcements, Help, Tips & Tricks. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.