PRECISE REALTIME DIFFERENTIAL NAVIGATION USING NTRIP STREAMS FROM

COMMENTS • NTRIP data freely available from GNSS networks provide an invaluable test-bed for

NTRIP Sites, Many Available through BKG (Mostly 1 Hz GPS data, Raw or RTCM

Some countries are developing or considering SBAS, DGPS, Precise DGPS. More could soon join

The “IT” Real-time navigation software has been developed with support from the US Navy

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PRECISE REAL-TIME DIFFERENTIAL NAVIGATION USING NTRIP STREAMS FROM CONTINUOUSLY OPERATING, WIDE-AREA GNSS NETWORKS. Oscar L. Colombo GEST/NASA Goddard Space Flight Center Maryland, USA

COMMENTS • NTRIP data freely available from GNSS networks provide an invaluable test-bed for innovation. • SBAS networks now begin operations, or are under development, in several countries, including developing ones, while more plan to build their own in the future. • Wide-area precise real-time kinematic positioning (with “floated ambiguities”) typically needs a long time (30 min – 1. 5 hs) assimilating data before the solution converges to its full precision. • New signals (L 2 C, L 5, P 5) can help shorten the convergence time, but their transmitter code biases have to be corrected using estimated values. Also the non-integer part of un-differenced L 1, L 2 ambiguities could be calibrated with data from the world-wide IGS network, to assist wide-area point-positioning. • The IGS (or some IGS’ ACs) could help by providing some, or all, of the corrections mentioned above, much as CODE does now with the P 1 -C 1 biases.

NTRIP Sites, Many Available through BKG (Mostly 1 Hz GPS data, Raw or RTCM 2. x, 3. 0) Map: BKG, Frankfurt

Some countries are developing or considering SBAS, DGPS, Precise DGPS. More could soon join them.

Source: BKG, Frankfurt

USA Off-Line Test, April 2004