Techavijit, Pirada

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Power Requirements for Battery Maintenance and Temperature Profile on High Altitude Platform
(2024-01-01)
Techavijit, Pirada
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Sukchalerm, Polkit
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Wongphuangfuthaworn, Natthapong
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Iamsawat, Jakkrit
Experiments on high-altitude platform (HAP) at the nearspace must be faced with extremely low temperatures, reaching as low as -50 degrees Celsius, which exceeds the operational range of electronic systems. Especially, the battery that requires a heating system and thermal insulation. This paper will report temperature profile on the HAP flight and the results of experiments with the installation of the heating system to determine its adequacy, and measuring the electrical power needed for heating.
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Potential of Photovoltaic on Small Stratospheric Satellite in Real-World Experiment
(2023-01-01)
Techavijit, Pirada
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Wongphuangfuthaworn, Natthapong
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Sukchalerm, Polkit
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Plodpai, Aniwat
This paper investigates the potential of monocrystalline photovoltaic (PV) panels to generate power when installed on stratospheric satellites through near-space flight experiments conducted at altitudes of 0-23 kilometers above sea level. It also compares the results with a mathematical model developed by ASHRAE in previous research, which reveals the differences caused by various factors such as atmospheric attenuation and high-level clouds. The main objective of this study is to identify the optimal altitude for deploying stratospheric satellites with appropriately sized PV panels that can generate sufficient power to meet the communication system's requirements for long-term operation.
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Internet network in space for small satellites: Concept and experiments
(2018-01-01)
Techavijit, Pirada
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Sukchalerm, Polkit
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Wongphuangfuthaworn, Natthapong
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Plodpai, Aniwat
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Manuthasna, Shariff
Currently, no wireless network service is being offered in space. This fact has caused satellite developers to establish their own wireless network with a low coverage area that does not function very well. These problems can be resolved by setting up an effective wireless network that can be offered as a service to satellites in orbit. This study is focused on designing a high-quality wireless-in-space network to connect satellites in orbit to the Internet. Such a network would enable satellites to be controlled through the Internet from the Earth without having their own ground stations. In this paper, various aspects of the design of a network setup standard are discussed. These aspects include appropriate wireless communication and the construction of a model satellite that can be connected to the network from space. The work also included testing the design by setting up the Internet network for use above Thailand's territory and launching the original model satellite for the demonstration of the principle. The sensor data was then transmitted in real time to audiences from all over the country and used to design an Internet network in space with global coverage, which is a target for further development.
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Suitable altitude for long-operated communication high altitude balloon with experimental flights
(2016-03-23)
Techavijit, Pirada
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Chivapreecha, Sorawat
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Sukchalerm, Polkit
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Wongphuangfuthaworn, Natthapong
High Altitude Platform (HAP) is a platform for many purposes e.g. remote sensing, communication, science experiment etc. Several countries are likely interested in research and development of HAP for communication since it combines the benefits of terrestrial and satellite systems. The objective of this paper is to find the suitable altitude to operate zero-pressure balloons, a type of high altitude platform which maintainable of desired altitude, for longest duration. This paper presents an experiment of zero-pressure balloon including design and development. The main parameters considered in this study are wind data and RF propagation. The wind data has been collected from several sources: from daily weather balloons recorded for 5 years and from the experimental balloon flights. This paper will discuss the suitable altitude for operating the zero-pressure balloons for longest duration without any control system. This paper shall also recommend altitude for further study.
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Fly-around-the-World Near-Space Picosatellite for Cost-Effective School Space Projects
(2024-07-01)
Techavijit, Pirada
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Sukchalerm, Polkit
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Wongphuangfuthaworn, Natthapong
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Kiyapaet, Sureepon
This research presents the design and development of a near-space picosatellite platform intended to operate at high altitudes between 20–40 km above sea level. These picosatellites function similarly to orbital satellites but float and travel with the wind in the atmosphere instead of orbiting the Earth. The platform utilizes a super-pressure balloon to provide buoyancy, allowing the picosatellite to remain airborne and operational for several days to months, capable of flying around the world multiple times. This study focuses on the cost-effective design of high-altitude platforms, telecommunication systems, and energy consumption for the picosatellite, enabling it to communicate with ground stations from anywhere in the world while consuming low power. The use of common COTS (Commercial Off-The-Shelf) equipment aims to enhance accessibility for educational applications. This research gathered data from our previous studies for over 20 high-altitude platform flights, analyzed the necessary factors for whole system design, and developed a new prototype that has been successfully built and tested.

Techavijit, Pirada

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