Making a cheaper dGPS for use where lots are needed with radio links home would be a great invention for glaciology.
LEA-6T is the device we will test from here. It uses L1 only but also records Glonass sats. We will record data to uSD and make a communications net to send the data out. It also provides an accurate clock tick we can use to synchronise multiple geophone stations.
Post-processing and file formats need investigating. eg rtklib
eg: rtklib-convbin file.ubx
can extract the raw data - more details here
we hope for accuracy of a few cm. see "GPS-Equipped Wireless Sensor Network Node for High-Accuracy Positioning Applications" Bernhard Buchli, Felix Sutton, and Jan Beutel
In 2013 the deployed ublox system was accurate to about +- 10cm (20cm vertically) with a 2hr recording processed against the moraine Leica station.