Hartmann-Shack method is widely used in adaptive optics system for wavefront sensing.A data processing system i employed in the sensor for computing wavefront gradient,wavefront reconstruction and control.To get a wide control bandwidth,the system should reach the processing needs in real time.In this paper,a parallel processing architecture called pipeling multiple SIMD(PMSIMD) architecture is presented.In the system,image acqusltion,wavefront gradient computation(WFGC) and wavefront reconstruction computation(WFRC) are conducted in pipeline,at the same time,the SIMD architecture is employed in both of the WFGC and WFRC.The computer simulation experiment shows the system based on the PMSIMD architecture is capable of processing video images of l2SXl28 pixels at 1000 frames per second and the time delay is less than 1/4 of frame period.
The probtein of spectral parameter estimation using Hopfie1d neural networks (HNN) is studied in this paper. Linear prediction method for teast square (LS) estimates and Pisarenko's harinonical. retrieval method for constrained Least-square estimates by IINN are introduced and an improved IINN algorithm for spectral peak searching is derived. The key problem we attempt to solve is to map these actual optimisation problems to proper energy functions.
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