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  • Power System for Twin Nano-satellite Based on Attitude Determination and Control System

    Paper number

    IAC-15,C3,IP,5,x29120

    Author

    Mr. Shiva Abhishek, Siddaganga Institute of Technology, Tumkur, India

    Coauthor

    Prof. T.C. Mahalingesh, Siddaganga Institute of Technology, India

    Year

    2015

    Abstract
    The STUDSAT 2A/2B is a twin nano-satellite, each weighing about 5.5 kg with solar panel deployment mechanism. The backbone for successful working of a satellite is the power system. The solar arrays are mounted on both the surface of the deployable panel which helps to generate power from direct sun rays and also from albedo rays of the earth thus reducing the eclipse period by 15%. The power generated for various LEO, polar sun-synchronous orbit with 98° inclination is calculated. The power storage is accomplished by a combination of flexible battery configurations. The detailed power profile and spontaneous switching between various payloads is considered in power management. The main aim is to deliver conditioned and regulated voltage at various bus voltages of 3V, 5V and 12V. The power system is optimised by efficient power distribution unit with minimum losses.
    For adequate generation of power, solar panels must be always oriented towards the sun in the orbit; if any change in the attitude occurs it affects the power generation and reduces the lifespan of the spacecraft. The designed attitude determination and control system consists of a 3-axis gyro sensor, magnetometer, and sun sensor for attitude determination and a set of reaction wheels and magnetic torquer coils for actuation. As the gyro sensors and magnetometers are MEMS based, they are prone to inconsistency due to varying temperatures, noise and integrating bias. This is compensated by using bias compensation algorithms, Kalman filters and B-dot control algorithm for accurate measurement and actuation control. The combination of three attitude sensors monitors the changes in attitude and actuators provide required pointing accuracy. The STUDSAT 2A/2B has power limitations and this power system is designed to overcome the above mentioned points within the constraints on size, cost and performance.
    Abstract document

    IAC-15,C3,IP,5,x29120.brief.pdf

    Manuscript document

    (absent)