This data is intended only to illustrate the relative accuracy of corrected and differentially corrected positions. Very little difference in accuracy was noted between corrected and uncorrected data for this 1 second data. The external antenna configuration yielded the highest relative accuracy. Since the data in Figures 4 and 5 discussed above contains all SNR configurations only the relative accuracy of the differential corrections is valid, not the absolute accuracy of the corrections. The accuracy of differentially corrected data will be more thoroughly examined in test 3 where the data is segregated by different SNR configurations.
External antenna is recommended.
Graph of the differentially corrected accuracy of various receiver configurations with 1 position of data using different combinations of PDOP and SNR settings at the forested Clackamas Test Network. Graph of the differentially corrected accuracy of various receiver configurations with 50 positions of data using different combinations of PDOP and SNR settings at the forested Clackamas Test Network. The data on Figures 6 and 7 again illustrate the increased accuracy gained by averaging 50 positions. The magnitude of the accuracy increase was significant varying from 8 to 25 meters with the greatest increases occurring with the external antenna. GPS users should use the accuracy and efficiency information show on figures 6,7, and 8 to determine the receiver settings and correction method most appropriate to the accuracy requirements of their project.