Where to get base-station data for PPK

Public CORS networks

National and regional agencies publish GNSS observations from permanent stations. Examples include NGS NOAA CORS in the United States and Geoscience Australia services. Availability, formats and access conditions vary.

Commercial correction networks

Commercial networks can provide broader coverage, support and predictable access in some regions. Examples include SmartNet globally and AllDayRTK in Australia and New Zealand. Confirm the service area, observation interval and licence terms.

Your own base receiver

For sites beyond suitable network coverage, record base observations locally and export RINEX for processing.

What makes base data suitable

Check station distance, observation overlap, sampling interval, antenna information and data completeness. The nearest station is not automatically the best station.

• .OBS format : this is the typical RINEX (receiver independent exchange) format, and ASCII file. Your receiver may produce a Binary file which can be supported to RINEX with the manufacturer’s software.

• 1hz data : that is 1 measurement per second in the log

• Within range : Range varies depending on ionospheric conditions at the time, but typically under 25 miles or 40km is best. At longer ranges the processing may only achieve float solutions.

• Full constellation : GPS, Glonass, Beido and Galileo satellites, with multiple frequencies will give the best results.

A simpler route

KlauPPK integrates supported CORS sources into the project workflow and also accepts suitable local-base RINEX.