University of Southern California

NASA-Catalog: 38760

Downlink / Bake

437.600 MHz 1k2 AFSK AX.25, FM





Orbital Parameter

NORAD                   38760
Inclination             64.666
RA of A. Node           266.436
Eccentricity            0.0147374
Argument of Perigee     56.877
Revs per day            14.89369403
Period                  1h 36m 41s (96.68 min)
Semi-major axis         6 978 km
Perigee x Apogee        497 x 703 km
BStar (drag term)       0.000700800 1/ER
Mean anomaly            304.657


The primary payload speaks to a mission with global reach: tracking cargo containers over the open ocean with a 1-watt WiFi-like transceiver. A current tracking system for cargo containers, designed by our primary payload provider iControl Inc., is capable of identifying the container within a mile from shore, but loses all contact for the majority of the open-water journey. For both government and non-government entities, the ability to track containers in transit is highly valued. This mission uses a custom-built deployable mesh antenna, and stretches the attitude control and power generation capabilities of the Colony I bus to its limits.
The secondary payload is an experimental, next-generation, radiation-hardened flight processor. The result of many government-funded research initiatives, this ITAR-controlled processor is at risk of staying in the “unholy valley” between research and development. On Aeneas, the processor will be space-qualified by performing self-diagnostic checks and reporting the results back to the ground. We hope that by raising the technology readiness level (TRL) we can provide a path to service for this high-performance chip.

14 Sep 2012, 12:15 UTC

sound AENEAS audio signal

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The packet below, stored in the file sample.dat, is used for illustration. The ASCII characters represent hexadecimal digits. How the bit patterns encoded by these digits is interpreted depends on their position in the packet.


Breakdown of the packet by byte:

	Bytes                   Label                        Offset
-----                   -----                        ------
43 41 45 52 55 53       Packet Header                 0 -  5
1D 00                   Packet Length                 6 -  7
40                      Packet Type                   8 -  8
02 00                   Unused Bytes                  9 - 10
01 01 0B 06 00 07 32    Date/Time Encoding           11 - 17
FF 07                   Reboot Counter               19 - 20
00 00                   Reboot Reason Code           21 - 22
00 10                   Flash Status Flags           23 - 24
00 F0 75 00             Telemetry Pointer            25 - 28
00 3E 33 00             Payload Write Pointer        29 - 32
41                      Radio Status                 33 - 33
C0 A5 0B C1             Miscellaneous Write Pointer  34 - 37
CF D3                   Checksum                     38 - 39

The first six bytes represent a marker token that signals that a packet follows. For AENEAS, the word “CAERUS” is used. (CAERUS is the name of a previous USC spacecraft, the “older sibling” of AENEAS.) The marker will always be 434145525553, CAERUS in ASCII. The final two bytes of the packet are a checksum. The decoder calculates the checksum and compares it to this value to validate the data.


AENEAS Beacon Data Decoder
Opening file at 30092012.txt
 AENEAS Beacon TLM Packet found:
Total length: 29
Unused: 0x02 0x00 
Time: 1/1/11-6-0:9:0
Reboots: 2047
Last Reboot Cause: 0
Flash Status: 0
Bit 0 = 0 : Device is ready.
Bit 1 = 0 : Device is NOT write-enabled.
Bit3&4= 1 : All sectors software-protected.
Bit 4 = 0 : WP is asserted.
Bit 5 = 0 : Last op successful.
Bit 7 = 0 : Sector Protection Registers unlocked.
Payload Write Pointer: 3551488
Telemetry Pointer: 7729152
Radio Status: 65
No detailed Radio info yet
Misc Write Pointer: -1052436736
Done: End of stream reached.

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Please send RAW temetry information recieved to the following e-mail with “Pass” in the title of the e-mail:

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