The phase gradient autofocus algorithm: An optimal estimator of the phase derivative
The phase gradient algorithm represents a powerful new signal processing technique with applications to aperture synthesis imaging. These include, for example, synthetic aperture radar phase correction and stellar image reconstruction. The algorithm combines redundant information present in the data to arrive at an estimate of the phase derivative. In this report, we show that the estimator is in fact a linear, minimum variance estimator of the phase derivative. 7 refs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- Sponsoring Organization:
- DOE/DP
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 5609345
- Report Number(s):
- SAND-89-0761; ON: DE90000895
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
440300* -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
ALGORITHMS
AUTOMATION
FOCUSING
IMAGE PROCESSING
IMAGES
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
PHASE SHIFT
PROCESSING
RADAR
RANGE FINDERS
SYNTHETIC-APERTURE RADAR
47 OTHER INSTRUMENTATION
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
ALGORITHMS
AUTOMATION
FOCUSING
IMAGE PROCESSING
IMAGES
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
PHASE SHIFT
PROCESSING
RADAR
RANGE FINDERS
SYNTHETIC-APERTURE RADAR