Implications of SAR ambiguities in estimating the motion of slow targets
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Authors
Garren, David A.
Subjects
Synthetic aperture radar
Radar theory
Moving Targets
Radar theory
Moving Targets
Advisors
Date of Issue
2017-04-28
Date
Publisher
Language
Abstract
This paper examines the implications pertaining to the problem of attempting to invert synthetic aperture radar (SAR) measurement data to yield unique estimates of the underlying motion of slow targets in the imaged scene. A recent analysis has demonstrated that ambiguities exist in estimating the kinematics parameters of surface targets for general bistatic SAR collection data. In particular, a procedure has been developed which generates alternate target trajectories which give the same SAR measurements as that of the true target motion. The current paper extends the earlier analysis by generating specific numeric examples of alternate target trajectories corresponding to the motion of a given slowly moving target. This slow-target case reveals the counter-intuitive result that a single SAR collection data set can be generated by target trajectories with significantly different, and possibly opposing, heading directions. For example, the true motion of a given target can be moving towards the mean radar position during the SAR collection interval, whereas a valid alternate trajectory can correspond to a target that is moving away from the radar. The present analysis demonstrates the extent of the challenges associated with attempting to estimate of the underlying motion of targets using SAR measurement data.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1117/12.2263096
Series/Report No
Department
Electrical and Computer Engineering (ECE)
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
AFRL for partial sponsorship
Funder
Format
14 p.
Citation
Garren, David A. "Implications of SAR ambiguities in estimating the motion of slow targets." In Algorithms for Synthetic Aperture Radar Imagery XXIV, vol. 10201, p. 102010E. International Society for Optics and Photonics, 2017.
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.