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Objective of this paper is to investigate whether the noise in attitude dynamics model and measurement model is Gaussian white noise process or not. This is important because if the assumption regarding the noise is wrong, this will lead to unreliable and inaccurate estimation. The residual between the standard model and the real data is computed and is analyzed using autocorrelation function via Minitab software. The result shows that the error in the attitude dynamics model is not Gaussian white noise, while the error in measurement model is Gaussian white noise. IndexTerms-Satellite attitude estimation, noise, autocorrelation function.

Astronautic Technology (M) Sdn. Bhd. (ATSB ® ) has embarked on an in-house composite solid propellant development program as a means of capacity building in the field of propulsion and related technologies. A composite solid propellant based upon the utilization of a phase-stabilised form of Ammonium Nitrate as an oxidiser is being investigated as a means of developing a stable propellant that may be used for high altitude ballistic flights. Ammonium Nitrate were used in this work rather than the other industry standard solid propellant oxidiser such as fine grain Ammonium Perchlorate, largely due to the availability aspect and ease of handling of such material. In order to characterise the Ammonium Nitrate based propellant, a series of static firing tests utilizing three different type of propellant test motor have been performed to measure essential internal ballistic performances. The test motors are Small Length Test Motor, Full Test Motor and Flight Test Motor. A DataAcquisition (DAQ) system consisting of pressure transducer, load cell and thermocouple was used to record and analyse pressure, thrust and temperature data which characterises the propellant performance. The thrust and pressure profiles were plotted and ultimately compared with the simulated profiles generated by FPRED; a propellant ballistics analysis software for amateur rocketry. Keywords-solid propellant, propulsion, ammonium nitrate, static motor test, internal ballisticI.

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