Learning from history: adaptive calibration of 'tilting spine' fiber positioners

Conference item

This paper discusses a new approach for determining the calibration parameters of independently-actuated optical fibers in multi-object astronomical fiber positioning systems. This work comes from the development of a new type of piezoelectric motor intended to enhance the ‘tilting spine' fiber positioning technology originally created by the Australian Astronomical Observatory. Testing has shown that the motor's performance can vary depending on the fiber's location within its accessible field, meaning that an individual fiber is difficult to calibrate with a one-time routine. Better performance has resulted from constantly updating calibration parameters based on the observed movements of the fiber during normal closed-loop positioning. Over time, location-specific historical data is amassed that can be used to better predict the results of a future fiber movement. This is similar to a technique previously proposed by the Australian Astronomical Observatory, but with the addition of location-specific learning. Results from a prototype system are presented, showing a significant reduction in overall positioning error when using this new approach.

Authors: Gilbert, J; Dalton, G

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Astronomical Society of the Pacific
• Host title: Astronomical Data Analysis Software and Systems XXV
• Pages: 643-646
• Series: Astronomical Society of the Pacific Conference Series
• Series number: 512
• Publication date: 2017-01-01
• Acceptance date: 2015-10-24
• Event title: 25th Annual Conference on Astronomical Data Analysis Software and Systems (ADASS XXV)
• Event location: Sydney, Australia
• Event website: https://www.adass.org/pastven.html
• Event start date: 2015-10-25
• Event end date: 2015-10-29
• ISSN: 1050-3390
• ISBN: 9781583819081
• Language: English
• Keywords: FFR