Transcript Unisat-5 menifee review slides

Requirements for PocketQub
Structure
Solar panels & batteries
Communications
Antennas - made from tape measure blades 2 each ~ 7” long
Transmitter – gets hot. How cool? – make sure there is a good conducting path to
the structure. Heat is radiated to space from structure.
Receiver – keep on all the time, generally uses very little power.
C&DH - microprocessor
Attitude control – passive or active? – select passive – use permanent magnets
Attitude determination – how can we determine attitude? – not used for control, but would
like to know, so use solar panels to get sun direction.
Sensors
Temperature – where do we need to know temperatures? Microprocessor, transmitter,
battery, ???
Battery voltage – important to know, how can we control battery capacity? How about the
way we operate spacecraft? Don’t use transmitter, turn off payloads.
Safe mode – operating with only required things to keep it floating.
Currents – from all panels,
S/C temperature control – how to control passively?
Make surface more reflective, less absorptive – if too hot
Make surface more absorptive, less reflective - if too cold
Payloads?
Radiation detector
Magnetometer
Space environment protection?
Solar radiation – effect electronics – build structure out of AL, hope for best
Particle collisions – use cover glass on the solar cells
Requirements for PocketQub
Structure
Need to have a way to turn power off in the launcher and turn on when leaving
launcher.
Need to have a way to charge battery when PocketQub is in launcher.
Need to fold solar panels down in launcher.
How to release solar panels after launched?
How do we know when PocketQub will be over our ground station?
NORAD will provide orbit element numbers for initial launch.
Use elements in equations to calculate pass times and directions.
Have a beacon on our PocketQub. Send signal about every 1 minute and we can
listen for signal and then track with our antenna.
Solar panels & batteries