Comparison of Computed SAR Focus-Setting Curves with Model Predictions

This paper analyzes data from the TOWARD experiment to compute experimental SAR focus-setting curves for data obtained from two different altitudes. The purpose of the paper is to compare these experimental curves with the model predictions of Schult, Henyey, and Wright (1988), which is a companion...

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Bibliographic Details
Main Authors: DeWitt, R J, Henyey, F S, Wright, J A
Format: Report
Language:English
Subjects:
Active & Passive Radar Detection & Equipment
BACKGROUND NOISE
COMPUTATIONS
CONSISTENCY
DATA ACQUISITION
GUARANTEES
ORBITS
PHASE
PREDICTIONS
SIGNALS
SPECTRA
SURFACE WAVES
SYNTHETIC APERTURE RADAR
TWO DIMENSIONAL
VELOCITY
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Summary:This paper analyzes data from the TOWARD experiment to compute experimental SAR focus-setting curves for data obtained from two different altitudes. The purpose of the paper is to compare these experimental curves with the model predictions of Schult, Henyey, and Wright (1988), which is a companion paper to this one. The model predicts that the optimal focus-setting velocity for azimuthally-traveling long surface waves occurs at one-half of the phase speed of the dominant wave. The computed curves are in good agreement with this prediction; they simultaneously rule out the possibility that the optimal focus- setting velocity occurs at the phase velocity or the orbital velocity of the wave. An important part of the paper involves the manner in which the data is analyzed. It is shown that analysis of the full two-dimensional spectrum of the SAR image guarantees that the full signal of interests is included in the processing and provides a consistent technique by which background noise can be removed from the signal. Keywords: Synthetic aperture radar.