Comparison of Synthetic Aperture Radar Autofocus Techniques-Phase Gradient vs Subaperture
Conference
·
OSTI ID:5618434
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Two methods of focusing synthetic aperture radar (SAR) images are compared. Both a conventional subaperture cross-correlation method and a new phase gradient autofocus (PGA) algorithm developed at Sandia National Laboratories are shown to perform well if high-order phase errors are not present. With the introduction of significant high-order phase errors (e.g., due to uncompensated platform motion), both algorithms suffer a loss in performance. However, relative performance degradation is less for PGA than for the subaperture focusing technique. An explanation is presented for the observed behavior of the two autofocus techniques.
- Research Organization:
- Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5618434
- Report Number(s):
- SAND--91-0057C; CONF-9107115--5; ON: DE91014696
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
420200* -- Engineering-- Facilities
Equipment
& Techniques
440800 -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
97 MATHEMATICS AND COMPUTING
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALGORITHMS
APERTURES
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
CORRELATIONS
FOCUSING
FUNCTIONS
IMAGES
LEGENDRE POLYNOMIALS
MATHEMATICAL LOGIC
MEASURING INSTRUMENTS
OPENINGS
PHASE SHIFT
POLYNOMIALS
RADAR
RANGE FINDERS
SIMULATION
SYNTHETIC-APERTURE RADAR
420200* -- Engineering-- Facilities
Equipment
& Techniques
440800 -- Miscellaneous Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
97 MATHEMATICS AND COMPUTING
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ALGORITHMS
APERTURES
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
CORRELATIONS
FOCUSING
FUNCTIONS
IMAGES
LEGENDRE POLYNOMIALS
MATHEMATICAL LOGIC
MEASURING INSTRUMENTS
OPENINGS
PHASE SHIFT
POLYNOMIALS
RADAR
RANGE FINDERS
SIMULATION
SYNTHETIC-APERTURE RADAR