Projects

BEXUS5 - Participating experiments - Department of Space Science.

MPEG - Multi Purpose Experiment Gondola MPEG - Project website Platform operator: Jörgen Hedin. Subproject manager: Johannes Reldin. Participants: Mikael Koivunen, Kjell-Edmund Ims.

ASDS - Altitude Sensing and Determination System ASDS - Project proposal - 1,7Mb. Subproject manager: Thomas Ott. Participants: Christo Grigorov, Jimmy Lovén, Laurent Aupin. Objective: To determine movements aswell as flight path of the payload platform in real time. Method: ASDS is an attitude determination and sensing unit for the student balloon project BEXUS. The design is based on a 3-axis magnetometer determining the earth's magnetic field vector. It will be complemented by two 2-axis accelerometers based on MEMS technology sensing the forces acting about the gondola and determining the gravity vector. Furthermore a 3-axis gyroscope also based on MEMS technology is implemented to sense the rate of change thus combined with the accelerometer information the tilting of the gondola will be determined. The experiment transmits it's data to the groundstation and will be displayed in a 3D-software showing the whole flight path with the orientation of the gondola in real-time.

FTC - Flight Trajectory Computation FTC - Project proposal - 0,1Mb. Subproject manager: Lukas Karlsson Participants: Viktor Larsson, David Helgesson, Andreas Bofjäll. Objective: To evaluate the accuracy of flight trajectory computations. Method: The experiment uses six 3-axis accelerometers positioned at different locations throughout the box. By using a designed matlab alorigthm these accelerometers can give the accelerating vector of the experiment as well as the rotational motion in relation to the center of rotation of the gondola. A digital tilt compensated compass is used to give the orientation of the box in relation to the earths magnetic field. The compass is also equiped with a gyro that can be used to compare the actual rotational motion to the calculated one. The experiment transmits the data to ground but can also store locally. The data analysis will be done after the flight.

MMSP - Multi Motif Stratospheric Photography MMSP - Project website Subproject manager: Jörgen Hedin. Participants: Michael Erneland. Objective: To take a large number of high resolution photos and video recordings during flight. Method: This experiment will use a 8Mpixel digital camera with a 4Gb memory card. The camera is mounted inside a protective aluminum casing with the ability to change it's direction of view by 180 degrees. It will store about 500 photos and 120 minutes of video during the flight and is remote controlled to run special photo routines at times of special interest such as launch and cutoff.

PEM - Payload Environment Monitoring PEM - Project proposal - 0,1Mb. PEM - Final report - 3,7Mb. Subproject manager: Jan Torgrimsson. Participants: Jörgen Hedin. Objective: To measure the temperature the payload is exposed to during flight. Method: Four sensor cards will be placed on each side of the payload. Each sensor card contains a NTC thermal resistor and a photo transistor. The photo transistor keeps track of which sensor is exposed to sunligt and what influence that has on the temperature. The NTC is calibrated to record temperatures spanning from -80 to +80 degrees celcius, +- 1 degree. The temperature and level of sunlight intensity is sampled each second and stored locally onto EEPROM memories on the motherboard for post flight processing.