Advanced metrology sensor applications for improved pointing performance of the Greenland Telescope

Nimesh A. Patel; Pierre Martin-Cocher; Philippe Raffin; George Nystrom; Satoki Matsushita; Chih-Wei Huang; Klaus Willmeroth; Teddy Huang; Derek Kubo; Jun-Yi Koay; Cristina Romero-Canizales; Keiichi Asada; Ming-Tang Chen; Johnson Han; Paul T. P. Ho; Timothy Norton; T. K. Sridharan

doi:10.1117/12.3019144

11 September 2024 Advanced metrology sensor applications for improved pointing performance of the Greenland Telescope

Nimesh A. Patel, Pierre Martin-Cocher, Philippe Raffin, George Nystrom, Satoki Matsushita, Chih-Wei Huang, Klaus Willmeroth, Teddy Huang, Derek Kubo, Jun-Yi Koay, Cristina Romero-Canizales, Keiichi Asada, Ming-Tang Chen, Johnson Han, Paul T. P. Ho, Timothy Norton, T. K. Sridharan

Author Affiliations +

Proceedings Volume 13094, Ground-based and Airborne Telescopes X; 130940G (2024) https://doi.org/10.1117/12.3019144
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Abstract

The Greenland Telescope (GLT) currently achieves a blind pointing accuracy of 2" rms, sufficient for 230GHz VLBI operations at Pituffik Space Base. Plans to relocate the antenna to Summit Station are underway to enable observations at ≥690GHz, which requires improving the pointing accuracy due to smaller beam sizes at higher frequencies. Since achieving the ALMA-standard referenced pointing accuracy of less than 1" for single-dish operations is impractical due to limited sensitivity, GLT’s strategy involves real-time adjustments using data from metrology sensors, following the Systematic Pointing Error Model (SPEM) by the antenna manufacturer (Vertex Antennentechnik). This paper highlights our metrology system’s role in predicting pointing corrections through real-time monitoring of inclinometers, linear, and temperature sensors. Additionally, we introduce a night-viable optical guidescope system for astrometric referencing of star-fields, aiming to enhance pointing precision for high-frequency VLBI with the GLT.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Nimesh A. Patel, Pierre Martin-Cocher, Philippe Raffin, George Nystrom, Satoki Matsushita, Chih-Wei Huang, Klaus Willmeroth, Teddy Huang, Derek Kubo, Jun-Yi Koay, Cristina Romero-Canizales, Keiichi Asada, Ming-Tang Chen, Johnson Han, Paul T. P. Ho, Timothy Norton, and T. K. Sridharan "Advanced metrology sensor applications for improved pointing performance of the Greenland Telescope", Proc. SPIE 13094, Ground-based and Airborne Telescopes X, 130940G (11 September 2024); https://doi.org/10.1117/12.3019144

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