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This community-developed package provides a Python interface for reading tightly packed bits in the Consultative Committee for Space Data Systems (CCSDS) format used by many NASA and ESA missions. The library is developed with requirements sourced from the community and extensive automated testing.

Do you know of other missions that use CCSDSPy? Let us know through a github issue!

To install ccsdspy

pip install ccsdspy

The following example shows how simple it is to read in fixed length CCSDS packets.

import ccsdspy
from ccsdspy import PacketField, PacketArray

pkt = ccsdspy.FixedLength([
     PacketField(name='SHCOARSE', data_type='uint', bit_length=32),
     PacketField(name='SHFINE',   data_type='uint', bit_length=20),
     PacketField(name='OPMODE',   data_type='uint', bit_length=3),
     PacketField(name='SPACER',   data_type='fill', bit_length=1),
     PacketField(name='VOLTAGE',  data_type='int',  bit_length=8),
     PacketArray(
         name='SENSOR_GRID',
         data_type='uint',
         bit_length=16,
         array_shape=(32, 32),
         array_order='C'
     ),
])

result = pkt.load('mypackets.bin')

Our documentation is hosted on readthedocs and can be found here.

For more information or to ask questions about the library or CCSDS data in general, check out the CCSDSPy Discussion Board hosted through GitHub.

If you use ccsdspy, it would be appreciated if you let us know and mention it in your publications. The code can be cited using the DOI provided by Zenodo. The continued growth and development of this package is dependent on the community being aware of it.

When interacting with this package please behave consistent with the following Code of Conduct.