Abstract

GPS Accuracy Using Post Processed Data with CORS Stations
Track: GPS Technology
Author(s): Knute Berstis, Gerald Mader, Kevin Donnalley

The U.S. Census Bureau is using wireless PDA (Personal Digital Assistant) units with WAAS enabled GPS capability for the 2010 Census. NGS has been working with the Census Bureau to provide post-processed (differential) residential address coordinates where the WAAS signal is not available due to signal blockage. Tests have been conducted at the NGS Test Facility in Corbin, VA near different building structures using a hand held Garmin 12XL GPS receiver. Other tests have also been conducted in shopping malls to simulate a higher density address scenario and an environment an in urban neighborhood with higher tree density and significant leaf coverage. Statistical data is presented on achievable GPS accuracy at building entrances and at offsets from the entrance using only the L1 frequency and the NGS web-based OPUS Mapper software. The rms value of a single point position solution is evaluated as a possible outlier detector.

Knute Berstis
NOAA / National Geodetic Survey
SSMC 3, Station 8136
1315 East - West Highway
Silver Spring , Maryland 20910
United States
Phone: (301) 713-2853
E-mail: knute.berstis@noaa.gov

Gerald Mader
NOAA / National Geodetic Survey
SSMC 3, Station 8106
1315 East-West Highway
Silver Spring , Maryland 20910
United States
Phone: (301) 713-2854
E-mail: Gerald.L.Mader

Kevin Donnalley
US Census Bureau
4600 Silver Hill Road
Attn: Kevin Donnalley, 4h112a
Washington , District of Columbia 20233
United States
Phone: (301) 763-9181
E-mail: kevin.edward.donnelley@census.gov