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Proceedings Paper

Real-time wavefront processors for the next generation of adaptive optics systems: a design and analysis
Author(s): Tuan Truong; Gary L. Brack; Mitchell Troy; Thang Trinh; Fang Shi; Richard G. Dekany
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Paper Abstract

Adaptive optics (AO) systems currently under investigation will require at least two orders of magitude increase in the number of actuators, which in turn translates to effectively a 104 increase in compute latency. Since the performance of an AO system invariably improves as the compute latency decreases, it is important to study how today's computer systems will scale to address this expected increase in actuator utilization. This paper answers this question by characterizing the performance of a single deformable mirror (DM) Shack-Hartmann natural guide star AO system implemented on the present-generation digital signal processor (DSP) TMS320C6701 from Texas Instruments. We derive the compute latency of such a system in terms of a few basic parameters, such as the number of DM actuators, the number of data channels used to read out the camera pixels, the number of DSPs, the available memory bandwidth, as well as the inter-processor communication (IPC) bandwidth and the pixel transfer rate. We show how the results would scale for future systems that utilizes multiple DMs and guide stars. We demonstrate that the principal performance bottleneck of such a system is the available memory bandwidth of the processors and to lesser extent the IPC bandwidth. This paper concludes with suggestions for mitigating this bottleneck.

Paper Details

Date Published: 7 February 2003
PDF: 12 pages
Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); doi: 10.1117/12.459353
Show Author Affiliations
Tuan Truong, User Technology Associates, Inc. (United States)
Gary L. Brack, Jet Propulsion Lab. (United States)
Mitchell Troy, Jet Propulsion Lab. (United States)
Thang Trinh, User Technology Associates, Inc. (United States)
Fang Shi, Jet Propulsion Lab. (United States)
Richard G. Dekany, California Institute of Technology (United States)

Published in SPIE Proceedings Vol. 4839:
Adaptive Optical System Technologies II
Peter L. Wizinowich; Domenico Bonaccini, Editor(s)

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