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

Tuan Truong; Gary L. Brack; Mitchell Troy; Thang Trinh; Fang Shi; Richard G. Dekany

doi:10.1117/12.459353

7 February 2003 Real-time wavefront processors for the next generation of adaptive optics systems: a design and analysis

Tuan Truong, Gary L. Brack, Mitchell Troy, Thang Trinh, Fang Shi, Richard G. Dekany

Author Affiliations +

Proceedings Volume 4839, Adaptive Optical System Technologies II; (2003) https://doi.org/10.1117/12.459353
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

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.

Citation Download Citation

Tuan Truong, Gary L. Brack, Mitchell Troy, Thang Trinh, Fang Shi, and 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); https://doi.org/10.1117/12.459353

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