id: sarsat_pds_frame_sync
label: PDS Frame Sync
category: '[Sarsat]'

parameters:
- id: tag_name
  label: Tag Name
  dtype: string
  default: pds_sync

templates:
  imports: from sarsat import pds_frame_sync
  make: pds_frame_sync(tag_name=${tag_name})

inputs:
- label: in
  domain: stream
  dtype: byte

outputs:
- label: out
  domain: message

documentation: |-
  PDS (Polar-orbiting satellite Data Service) Frame Synchronizer.

  Expects "Correlate Access Code - Tag" block upstream with the Biphase-L
  decoded frame sync pattern (0x7FF = 15 ones).

  When a frame sync tag is detected, collects the following 576 bits (72 bytes)
  and emits as a PDU message.

  Parameters:
    tag_name: Name of the stream tag to look for (default: "pds_sync")

  Input: Biphase-L decoded bit stream with frame sync tags
  Output: PDU messages containing 72-byte PDS frames

file_format: 1