Please use this identifier to cite or link to this item:
Title: Investigation of the real-time accuracy of the DGPS method
Authors: John E. Chance and Associates, Inc.
United States. Army Research Office.
Surveying and Mapping Research and Development Program (U.S.)
Topographic Engineering Center (U.S.)
Lapucha, Dariusz.
Maynard, Kurtis L.
Keywords: Real-time DGPS
C/A code
Hydrographic surveying.
Selective availability (SA)
1-3 meters RMS
Publisher: U.S. Army Topographic Engineering Center.
Engineer Research and Development Center (U.S.)
Description: Technical report
Abstract: The Real-Time Differential GPS (DGPS) method using the C/A code (not carrier) has the potential to provide positional accuracy to 1-3 meters. DGPS is a viable option for positioning tasks in hydrographic surveying. Determination of the real-time DGPS accuracy is the main objective of this study. Accuracy provided by DGPS may deteriorate depending upon operational conditions. Factors influencing DGPS accuracy are discussed. Background of the DGPS method is given including mathematical description, but emphasis is on general concepts and discussion of DGPS error sources. DGPS implementation problems are discussed. Specific realtime data links and their throughput are analyzed. The RTCM-104 standard for meter level DGPS applications and the different DGPS systems used in the study are discussed. The analysis is performed using real-time and post-processed DGPS results. The influence of two major factors affecting the DGPS accuracy: distance from the monitor station and data rate of differential corrections; is investigated. The role of the data rate is evaluated using simulated data rate scenarios. Particular attention is given to the impact of Selective Availability (SA) on meter level DGPS performance during specific days of heavy SA.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

Files in This Item:
File Description SizeFormat 
TEC-0024.pdf1.81 MBAdobe PDFThumbnail