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satrs-book/src/communication.md
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# Communication with sat-rs based software
Communication is a huge topic for satellites. These systems are usually not (directly) connected
Communication is a huge topic for space systems. They are usually not (directly) connected
to the internet and only have 1-2 communication links during nominal operation. However, most
satellites have internet access during development cycle. There are various standards provided by
CCSDS and ECSS which can be useful to determine how to communicate with the satellite and the
primary On-Board Software.
of these systems have internet access during development cycle. There are various standards
provided by CCSDS and ECSS which can be useful to determine how to communicate with the satellite
and the primary On-Board Software.
# Application layer
Current communication with satellite systems is usually packet based. For example, the CCSDS space
Most communication with space systems is usually packet based. For example, the CCSDS space
packet standard only specifies a 6 byte header with at least 1 byte payload. The PUS packet
standard is a subset of the space packet standard which adds some fields and a 16 bit CRC, but
standard is a subset of the space packet standard, which adds some fields and a 16 bit CRC, but
it is still centered around small packets. `sat-rs` provides support for these ECSS and CCSDS
standards to also attempts to fill the gap to the internet protocol by providing the following
components.