Implementation of the phase gradient algorithm

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6944606

Wahl, D E; Eichel, P H; Jakowatz, Jr, C V

The recently introduced Phase Gradient Autofocus (PGA) algorithm is a non-parametric autofocus technique which has been shown to be quite effective for phase correction of Synthetic Aperture Radar (SAR) imagery. This paper will show that this powerful algorithm can be executed at near real-time speeds and also be implemented in a relatively small piece of hardware. A brief review of the PGA will be presented along with an overview of some critical implementation considerations. In addition, a demonstration of the PGA algorithm running on a 7 in. {times} 10 in. printed circuit board containing a TMS320C30 digital signal processing (DSP) chip will be given. With this system, using only the 20 range bins which contain the brightest points in the image, the algorithm can correct a badly degraded 256 {times} 256 image in as little as 3 seconds. Using all range bins, the algorithm can correct the image in 9 seconds. 4 refs., 2 figs.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: DOE/DP
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6944606
• Report Number(s): SAND-89-2985C; CONF-900756-4; ON: DE90012160
• Resource Relation: Conference: SPIE's international symposium on optical and optoelectronic applied science and engineering and exhibit, San Diego, CA (USA), 8-13 Jul 1990
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
RADAR
ALGORITHMS
COMPUTER ARCHITECTURE
CORRECTIONS
IMAGE PROCESSING
IMPLEMENTATION
PHASE SHIFT
MATHEMATICAL LOGIC
MEASURING INSTRUMENTS
PROCESSING
RANGE FINDERS
420200* - Engineering- Facilities
Equipment
& Techniques
990200 - Mathematics & Computers