id: sarsat_sarp_msg_extract
label: SARP Message Extractor
category: '[Sarsat]'

templates:
  imports: from sarsat import sarp_msg_extract
  make: sarp_msg_extract()

inputs:
- label: in
  domain: message

outputs:
- label: valid
  domain: message
- label: invalid
  domain: message

documentation: |-
  SARP (Search And Rescue Processor) Message Extractor.

  Each 72-byte PDS frame contains three 24-byte SARP messages.
  Each SARP message should start with the sync word 0xD60 (12 bits).

  This block splits incoming PDS frames into individual SARP messages
  and validates the sync word:

  - 'valid' port: Messages with correct sync word (0xD60)
  - 'invalid' port: Messages with incorrect sync word

  Note: Even messages on the 'invalid' port may contain recoverable
  beacon data - check BCH error correction codes.

  Input: PDU from PDS Frame Sync block (72 bytes)
  Output: Individual 24-byte SARP messages

file_format: 1