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This paper shows several stratospheric flights performed with weather balloons both in Romania and Australia. A typical 6 DOF (degrees of freedom) model is presented for the payload in order to allow a future implementation of controlled payload recovery through the usage of a steerable parafoil. Also an ascent rate calculation model is presented that takes into account a standard US 1976 atmosphere model as well as the thermodynamics of the lifting gas inside the weather balloon. It is shown the typical payload used as well as the APRS (automatic packet reporting system) communication package used for tracking and telemetry real-time as well as the photo and video equipment used for flight imaging. Altitude and trajectory are presented as functions of time and discussion is done regarding the best GPS (global position system) installation position in order to ensure GPS coverage data for most of the flight, including the burst. Various flight dynamics characteristics are described including the ascent and descent rates as well as a detailed description on how to achieve a desired ascent rate. Future aerosol detection mission is proposed in the framework of the next generation of satellites aimed at actively detecting aerosol pollution in the atmosphere. High altitude balloon platforms are proposed to provide calibration and validation of satellite data in various regions of interest worldwide.

Numerical Modelling of Trajectory of High Altitude Missions