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Development of UV astronomical instruments for balloon and space payloads a thesis submitted for the degree of doctor of philosophy(technology) to the department of applied optics and photonics, University of Calcutta, Kolkata Sarpotdar Mayuresh Nandkumar [Ph.D Thesis]

By: Contributor(s): Material type: TextTextPublication details: Bangalore Indian Institute of Astrophysics 2018Description: [various pagings.]Subject(s): Online resources: Dissertation note: Doctor of Philosophy University of Calcutta, Kolkata 2018 Summary: At Indian Institute of Astrophysics, we conduct high altitude balloon ex- periments for atmospheric and astronomical observations in UV wavelength range. To carry out observations of astronomical sources, a fine pointing sys- tem is usually required. One of the prime requirements for such a pointing system is a precision attitude determination sensor. As part of this thesis, I have developed a sensor which determines it’s orientation with respect to a fixed inertial coordinate system using bright stars which are fixed in the sky and act as reference points, and hence called a star sensor. We estimated the requirements for the imaging system of the sensor and simulated the sky coverage of the sensor. We also made a MATLAB tool to evaluate the perfor- mance of various algorithms required to obtain orientation information from images. Such a sensor has wide application on satellites carrying telescopes, earth observation cameras and high gain directional antennae. The system was designed keeping in mind its applications on a balloon platform as well as it’s portability to a satellite platform. Calibration and testing of such a high accuracy sensor are critical to use it efficiently as a part of a pointing control system. In this thesis, we describe the development, calibration and validation of the star sensor from block diagram to fabrication and the methods we used for its calibration.
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Ph.D. Thesis, University of Calcutta, Kolkata

Doctor of Philosophy University of Calcutta, Kolkata 2018

At Indian Institute of Astrophysics, we conduct high altitude balloon ex-
periments for atmospheric and astronomical observations in UV wavelength
range. To carry out observations of astronomical sources, a fine pointing sys-
tem is usually required. One of the prime requirements for such a pointing

system is a precision attitude determination sensor. As part of this thesis, I
have developed a sensor which determines it’s orientation with respect to a
fixed inertial coordinate system using bright stars which are fixed in the sky
and act as reference points, and hence called a star sensor. We estimated
the requirements for the imaging system of the sensor and simulated the sky

coverage of the sensor. We also made a MATLAB tool to evaluate the perfor-
mance of various algorithms required to obtain orientation information from
images. Such a sensor has wide application on satellites carrying telescopes,
earth observation cameras and high gain directional antennae. The system
was designed keeping in mind its applications on a balloon platform as well as
it’s portability to a satellite platform. Calibration and testing of such a high
accuracy sensor are critical to use it efficiently as a part of a pointing control
system. In this thesis, we describe the development, calibration and validation
of the star sensor from block diagram to fabrication and the methods we used
for its calibration.

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