Ported from zleffke/gr-sarsat (2018, GNU Radio 3.7):
- Updated Python 2 → Python 3
- Converted XML block definitions to YAML
- Added pyproject.toml for modern packaging
- Preserved original MIT license
Blocks:
- biphase_l_decode_bb: Manchester decoder (decim_block)
- pds_frame_sync: Frame synchronizer with PDU output
- sarp_msg_extract: SARP message splitter/validator
