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Real-time wavefront processors for the next generation of adaptive optics systems: a design and analysis

Truong, Tuan and Brack, Gary and Troy, Mitchell and Trinh, Thang and Shi, Fang and Dekany, Richard (2003) Real-time wavefront processors for the next generation of adaptive optics systems: a design and analysis. In: Adaptive Optical System Technologies II. Proceedings of SPIE. No.4839. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 911-922. ISBN 9780819446183.

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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.

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Additional Information:© 2003 Society of Photo-optical Instrumentation Engineers (SPIE). This research was carried out in part at the Jet Propulsion Laboratory, California Institute of Technology, and was sponsored by the California Institute of Technology and the National Aeronautics and Space Administration. The authors wish to thank Samuel Igwe of Pentek Inc. for the valuable support provided during our development.
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Subject Keywords:Adaptive optics, wavefront processors, TMS320C6701
Series Name:Proceedings of SPIE
Issue or Number:4839
Record Number:CaltechAUTHORS:20190118-103808806
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Official Citation:Tuan Truong, Gary L. Brack, Mitchell Troy, Thang Trinh, Fang Shi, Richard G. Dekany, "Real-time wavefront processors for the next generation of adaptive optics systems: a design and analysis," Proc. SPIE 4839, Adaptive Optical System Technologies II, (7 February 2003); doi: 10.1117/12.459353
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92369
Deposited By: Tony Diaz
Deposited On:21 Jan 2019 23:06
Last Modified:16 Nov 2021 03:49

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