AAUSat-III

Aalborg University Denmark

AAUSAT3 is the third CubeSat built and operated by students from Aalborg University in Denmark. It will be launched from Satish Dhawan Space Centre in India on a PSLV-20 rocket. AAUSAT3 carries two AIS receivers as the main payload. Main test area will be around Greenland due to the low density of ships and the cooperation with our main sponsor Danish Maritime Authority. AAUSAT3 will - hopefully - be capable of receiving AIS information and carry out on-line information analysis. Still the full AIS telegrams (the HDLC package) are stored on-board and can be downloaded. Partially damaged telegrams will be stored as well (given a number of restrictions/rules) for later repairing in the ground segment. So weak signals (like from SART equipment) may be receive-able by AAUSAT3.

AAU CubeSat III

NASA-Catalog: 39087

Downlink

437.425 MHz, (MSK 9k6, FM) und CW Bake

Call

OZ3CUB

Status

ACTIVE

Orbital Parameter

Inclination             98.471
RA of A. Node           245.161
Eccentricity            0.0004579
Argument of Perigee     356.252
Revs per day            14.32690253
Period                  1h 40m 30s (100.50 min)
Semi-major axis         7 161 km
Perigee x Apogee        779 x 786 km
BStar (drag term)       -0.000011606 1/ER
Mean anomaly            218.660


Telemetrie

CW Bake
OZ3CUB B x.x(battery voltage) T xx(temp)

The spacelink frames start with a variable length training sequence (default 60 bytes), followed by a 6 byte syncword ("OZ3CUB"). The packet format supports two different packet lengths, either 25 or 86 bytes. A one byte Frame Size Marker (FSM) is used to differentiate between long and short packets. The FSM is 0xA6 for short frames and 0x59 for long frames.

AAU CubeSat III

Next, 31 or 92 bytes (short or long packets) of FEC coded data follows. After applying the FEC, the FEC data length is:
Short Frame: ((2 + 4 + 23 + 2) bytes [data] + 32 bytes [RS] + 1 byte [Conv. tail]) * 2 [Conv.] = 128 bytes
Long Frame: ((2 + 4 + 84 + 2) bytes [data] + 32 bytes [RS] + 1 byte [Conv. tail] * 2 [Conv.] = 250 bytes


AAU CubeSat III

Homepage und weitere Info's

http://www.space.aau.dk/aausat3/index.php


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