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Application of a novel multi-stage signal parameter estimator to high dynamic GPS receiversThe performance of a novel multistage estimator when applied to the estimation of the position, velocity, and acceleration of high dynamic Global Positioning System (GPS) receivers is discussed. For the present application, a two-stage specialization of the more general estimation scheme is considered, wherein the first-stage algorithm is selected to be a modified least-squares algorithm operating upon the differential signal model and referred to as differential least-squares (DLS) and the second stage is simply an extended Kalman filter (EKF). In terms of the threshold on received carrier power-to-noise power spectral density ratio (CNR), when compared to the single-stage EKF algorithm, the DLS-EKF algorithm is about 1.5-2.0 dB better in terms of threshold and outperforms the crossproduct AFC (automatic frequency control) loop by 2-5 dB. For the case when data modulation is present, the proposed scheme provides an improvement of about 6 dB in terms of CNR compared to an earlier approximate MLE (maximum likelihood estimation) scheme. There are also very significant improvements in terms of other performance measures.
Document ID
19910048997
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Kumar, R.
(JPL, Pasadena; California State University Long Beach, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1990
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Meeting Information
Meeting: IEEE PLANS ''90 - Position Location and Navigation Symposium
Location: Las Vegas, NV
Country: United States
Start Date: March 20, 1990
End Date: March 23, 1990
Accession Number
91A33620
Distribution Limits
Public
Copyright
Other

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