The GPS ground station is an integral part of ATM operations. Having ground station data allows us to do differential GPS post processing to accurately calculate the position of the aircraft.
The ground station consists of 3 GPS receivers, an iridium notch filter, 4 port passive splitter and a netbook computer to download the data. The system has the ability to track both GPS and GLONASS constellations and is battery backed up for 24 hours of operation without power input. One of the GPS units operates at a low recording rate (logging once every 30 seconds) continually during a campaign. This data is used to calculate a resolved position for the GPS antenna. The other units record at 10hz during aircraft operations.