79 citations · 132 across the 7 of their papers we have counts for
8 papers · 1 filter
Anti-windup PI controller for millimeter-wave adaptive optics: a Nobeyama 45 m radio telescope simulation
Ichiro Jikuya, Yoichi Tamura, Akio Taniguchi +8
This work addresses the control problem for Millimeter-wave Adaptive Optics (MAO), which we define as compensating for the distance variation between the primary reflector (M1) and…
Millimeter-wave adaptive optics: Demonstrating closed-loop correction for lowest Zernike modes
Yoichi Tamura, Akio Taniguchi, Kotaro Iwakami +15
We report on a five-element prototype wavefront sensor for millimeter-wave adaptive optics (MAO), enabling closed-loop correction of tip-tilt and defocus via secondary mirror (M2)…
Characterization of sensitivity and responses of a 2-element prototype wavefront sensor for millimeter-wave adaptive optics attached to the Nobeyama 45 m telescope
Satoya Nakano, Yoichi Tamura, Akio Taniguchi +5
We report the results of the performance characterization of a prototype wavefront sensor for millimetric adaptive optics (MAO) installed on the Nobeyama 45 m radio telescope. MAO…
Wavefront sensor for millimeter/submillimeter-wave adaptive optics based on aperture-plane interferometry
Yoichi Tamura, Ryohei Kawabe, Yuhei Fukasaku +20
We present a concept of a millimeter wavefront sensor that allows real-time sensing of the surface of a ground-based millimeter/submillimeter telescope. It is becoming important fo…
Current status and future plan of Osaka Prefecture University 1.85-m mm-submm telescope project
Atsushi Nishimura, Kazuki Tokuda, Ryohei Harada +25
We report the current status of the 1.85-m mm-submm telescope installed at the Nobeyama Radio Observatory (altitude 1400 m) and the future plan. The scientific goal is to reveal th…
Wind- and Operation-Induced Vibration Measurements of the Main Reflector of the Nobeyama 45 m Radio Telescope
Ikumi Hashimoto, Masakatsu Chiba, Nozomi Okada +5
As deformations of the main reflector of a radio telescope directly affect the observations, the evaluation of the deformation is extremely important. Dynamic characteristics of th…
A Balloon-Borne Very Long Baseline Interferometry Experiment in the Stratosphere: Systems Design and Developments
Akihiro Doi, Yusuke Kono, Kimihiro Kimura +33
The balloon-borne very long baseline interferometry (VLBI) experiment is a technical feasibility study for performing radio interferometry in the stratosphere. The flight model has…
Z45: A New 45-GHz Band Dual-Polarization HEMT Receiver for the NRO 45-m Radio Telescope
Fumitaka Nakamura, Hideo Ogawa, Yoshinori Yonekura +20
We developed a dual-linear-polarization HEMT (High Electron Mobility Transistor) amplifier receiver system of the 45-GHz band (hereafter Z45), and installed it in the Nobeyama 45-m…