Some amateur radio folks put together a DGPS reference station a while back. Used Motorola Oncore GPS, which the UT+ model supported "site survey" mode. A survey took about 3 hours but then you had your own reference.
You can find the HW docs here: http://www.tapr.org/gps_vpib.html
and the DGPS C code here: http://www.tapr.org/software_library.php?dir=/gps/DGPS/N8PXW Control software here:http://www.tapr.org/gps_tac32.html
You can still find these GPS units on ebay, but since they are 10 years old, current models are likely more accurate, as receiver noise plays a significant role.
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