NDLI: Stochastic model and experimental measurement of ocean-scattered GPS signal statistics

Content Provider	IEEE Xplore Digital Library
Author	You, H. Heckler, G. Garrison, J.L. Zavorotny, V.U.
Copyright Year	2003
Description	Author affiliation: Sch. of Aeronaut. & Astronaut. Eng., Purdue Univ., West Lafayette, IN, USA (You, H.; Heckler, G.; Garrison, J.L.)
Abstract	Information about the roughness of the ocean, and related geophysical parameters, including wind speed, is present in the shape of the code-correlation waveform of forward scattered GPS signals. A model is developed for the statistics of this waveform, to be used in the prediction of retrieval accuracy and the design of optimal estimators for the retrieval of meaningful geophysical data. Time and frequency domain models for complex "voltage" correlation waveform are developed and compared against experimental results. The analytical form of a model for the autocorrelation of the "power" (real) waveform is also presented. These two models can be applied to determine the upper limit for predetection integration time, and the time between independent waveform samples, respectively. C/A code waveforms were produced, with a 1 msec integration time, from measurements of reflected GPS signals recorded in 1999 near Puerto Rico. Time and frequency domain measurements of the correlation time of these waveforms were estimated through fitting a Gaussian function to the autocovariance and through measuring the width of the power spectral density, respectively. Typical experimental values obtained for voltage model, at aircraft altitude and speed, were 4.2 msec at the peak of the waveform, decaying to 1 msec at a code lag of 3.5 chips. For power model, they were 3.5 msec at the peak of the waveform, decaying to 1 msec at a code lag of 1.8 chips.
Starting Page	4492
Ending Page	4494
File Size	1563899
Page Count	3
File Format	PDF
ISBN	0780379292
DOI	10.1109/IGARSS.2003.1295557
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-07-21
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Stochastic processes Sea measurements Global Positioning System Statistics Geophysical measurements Time measurement Information retrieval Frequency domain analysis Voltage Density measurement
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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