Title :
Comparisons of error characteristics between TOA and TDOA positioning
Author :
Shin, Dong-Ho ; Sung, Tae-Kyung
Author_Institution :
Dept. of Electr. Eng., Chungnam Nat. Univ., Taejon, South Korea
fDate :
1/1/2002 12:00:00 AM
Abstract :
This paper presents a comparison of error characteristics between time of arrival (TOA) and time difference of arrival (TDOA) processing of the linearized GPS pseudo-range equations. In particular, the relationship among dilutions of precision (DOPs), position estimates, and their error covariances is investigated. DOPs for TDOA are defined using the error covariance matrix resulting from TDOA processing. It is shown that the DOPs and user position estimate are the same for TDOA and TOA processing. The relationship of DOPs and position estimates for standard GPS positioning and double differenced processing are also given
Keywords :
Global Positioning System; covariance matrices; measurement errors; signal processing; GPS navigation system; dilution of precision; double differenced processing; error characteristics; error covariance matrix; position estimate; time difference of arrival positioning; time of arrival positioning; Covariance matrix; Difference equations; Global Positioning System; Least squares methods; Position measurement; Radio navigation; Satellite broadcasting; Time difference of arrival; Time measurement; Transmitters;
Journal_Title :
Aerospace and Electronic Systems, IEEE Transactions on
