Information about the danish Aalborg University cubesat development.

Aalborg AAUSat Satellites



AAUSat3AAUSAT3 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.

Orbital parameters

Name                 AAUSAT3
NORAD                39087
COSPAR designation   2013-009-B
Inclination (degree) 98.631
RAAN                 254.341
Eccentricity         0.0012137
ARGP                 253.949
Orbit per day        14.33952507
Period               1h 40m 25s (100.42 min)
Semi-major axis      7 157 km
Perigee x apogee     770 x 787 km
Drag factor          0.000228900 1/ER
Mean Anomaly         106.039


437.450 MHz after launch – due to misconfiguration (March 30, 2013 still working at 437.425 so not reconfigured)

437.425 MHz, (MSK 2k4, FM) and CW Bake (IARU coordinated – will be changed during the first days in orbit)




Launched 25-feb-2013 at 12:30 UTC and active.

Provisional TLE data:

1 30000U 13010D   13056.53765324  .00000000  00000-0 -11606-4 0  0011
2 30000  98.4714 245.1613 0004579 356.2524 218.6600 14.32690253000011

Telemetry data:

CW Beacon

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.

AAUSat3 Telemetry Frame

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


Fact sheet

  • Formfactor
    • 1U cubesat (1U = 1 unit: 10cm * 10cm * 11.4 cm)
  • Weight
    • 875 gram (max for 1U i s 1.3 kg)
  • Power
    • 12 AZUR tripple junction solar cells of 29% efficiency
    • each 30 cm2
    • AAU student developed MPPT power supply
    • 2 LG ICR18650B4 batteries each 3.7V 2600 mAh
  • Radio
    • AAU student developed 437.425 MHz UHF GMSK 1200/2400/4800/9600/19200 baud
    • Our own forward error corrective protocol CSP
    • TX power max 1 W
  • Ground station
    • Ground station at AAU, Aalborg and TUW Austria
    • 2 18 element crossed yagis and Sp-70 LNA (antenna amplifier)
    • AAU student developed radio fron end
    • AAU student developed MCC (mission control center) and GND( front end radio server)
  • Payload AIS receiver
    • AAU student developed AIS receiver based on DSP BF 537
    • Decode in realtime, capacity above 10000 ships/hour depending conditions
  • Support Systems all developed by AAU students
    • FP – Flight planner (handling autonomous operations – based on orders from ground)
    • Log – Log system
    • ADCS – Attitude Determination and Control Systems for handling tumbling and pointing

Orbital parameters

Name                 AAUSAT5
NORAD                40948
COSPAR designation   ?
Inclination (degree) ?
RAAN                 ?
Eccentricity         ?
ARGP                 ?
Orbit per day        ?
Period               ?
Semi-major axis      ?
Perigee x apogee     ?
Drag factor          ?
Mean Anomaly         ?


437.425 MHz, (GMSK 2k4, FM) and CW Beacon




Launched and active.

Below a reception overview made at 09-10-2015 19:10 UTC. The GMSK beacons are transmitted every 45 seconds.

AAUSAT5 Reception

Telemetry data:

CW Beacon

OZ5CUB B x.x(battery voltage) T xx(temp)

Homepage and other references:

AAUSat-3 homepage
AAUSat-5 homepage