Motion estimation in ISAR focusing

John R. Bennett; David S. Brown; Barton P. Schade; John D. McGlynn

doi:10.1117/12.279479

24 September 1997 Motion estimation in ISAR focusing

John R. Bennett, David S. Brown, Barton P. Schade, John D. McGlynn

Proceedings Volume 3161, Radar Processing, Technology, and Applications II; (1997) https://doi.org/10.1117/12.279479
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

Inverse-synthetic aperture radar (ISAR) processing algorithms require an explicit or implicit model of the motion of the target, since this information is not measurable at the sensor. A major unsolved problem is whether it is better to develop a deterministic model of the motion or to fit the observations to a mathematical model which may be ambiguous with a wide range of physical target motions. This question is particularly important for the imaging of small targets in ground clutter since the available information on the target motion may be very limited. By contrast, the imaging of large ships in sea clutter yields a wealth of information of the motion of the body. This paper explores the effectiveness of models of the second kind by testing a set of motion estimation algorithms against motor vehicle targets imaged by a high-frequency SAR at long range and low grazing angle. The algorithms attempt to estimate the bulk motion of the vehicle and its rotation about its mean position by fitting many small pieces of information gathered from low quality or short duration scatterers detected in either the raw range- compressed signal history or in the complex image. In forming the motion model, the algorithm avoids undue reliance on particular bright or narrow-Doppler targets in favor of a global fit to many partially resolved or glinting features. The algorithm is demonstrated for 0.3 meter resolution SAR data of a Winnebago van from a Ku-band radar.

Citation Download Citation

John R. Bennett, David S. Brown, Barton P. Schade, and John D. McGlynn "Motion estimation in ISAR focusing", Proc. SPIE 3161, Radar Processing, Technology, and Applications II, (24 September 1997); https://doi.org/10.1117/12.279479

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available