Lam, Kuek Shen
(2019)
Development Of Electron Temperature And Density Probe (Tenep) For Mysat.
Project Report.
Universiti Sains Malaysia, Pusat Pengajian Kejuruteraan Aeroangkasa.
(Submitted)
Abstract
MYSat or Malaysia Youth Satellite is a CubeSat project initiated by Space System Lab, School of Aerospace Engineering, Universiti Sains Malaysia and is expected to be launched from International Space Station (ISS) to measure electron density in E-layer of ionosphere. Its application is to detect early warning of earthquake by measuring anomalies of electron. Electron Temperature and Density Probe (TeNeP) will be mounted on MYSat for this mission. MYSat is designed to be a single unit CubeSat with dimension of 10cm x 10cm x 10cm, therefore modification is made by replacing traditional frequency oscillator with radio frequency generator circuit. The circuit will be designed and developed based on the research carried out by National Cheng Kung University. Radio frequency generator circuit is categorised into two stages: first stage circuit generates frequency signals in sequence and second stage circuit to obtain electron current shift and upper hybrid resonance from the sensors. The main circuits in TeNeP are pulse generator, summing amplifier, integrator, voltage controlled-oscillator, local oscillator, mixer, low-pass filter, buffer, non-inverting amplifier and multiplexer. Each of these circuits is modelled on breadboard and tested with oscilloscope to obtain the output signal. The results are validated with the expected output signal. As for this research project, it is a continuous from previous section for first stage circuit. The circuits in this research project involving voltage-controlled oscillator circuit, local oscillator circuit, mixer and low-pass filter circuit. The significant of this research project is to develop a functional radio frequency generator circuit for TeNeP.
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