gr-apollo

warehack.ing/gr-apollo

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Author	SHA1	Message	Date
Ryan Malloy	cd3a8cc6be	Add SCO modulator, external audio input, and demo scripts - sco_mod: 9-channel FM subcarrier oscillator modulator (inverse of sco_demod), with round-trip tests proving voltage recovery across all channels - fm_voice_subcarrier_mod: add audio_input parameter to accept external float streams (e.g., Apollo mission voice recordings) instead of internal test tone - loopback_demo.py: streaming TX->RX round-trip with CLI for noise/voice/frames - agc_loopback_demo.py: full Virtual AGC integration via TCP bridge	2026-02-22 13:01:48 -07:00
Ryan Malloy	493c21c511	Add transmit chain: 6 composable GR source blocks mirroring CuriousMarc bench Implement the transmit/generate side as streaming GNU Radio blocks, complementing the existing receive chain. Each block maps to a physical instrument on CuriousMarc's Keysight bench: pcm_frame_source - PCM bit stream generator (sync_block + FrameSourceEngine) nrz_encoder - bits to NRZ waveform (+1/-1) with upsampling bpsk_subcarrier_mod - NRZ x cos(1.024 MHz) BPSK modulator fm_voice_subcarrier_mod - 1.25 MHz FM test tone source pm_mod - phase modulator: exp(j * deviation * input) usb_signal_source - convenience wrapper wiring all blocks together Includes GRC YAML definitions for all blocks under [Apollo USB] category, 49 new tests (271 total, all passing), and a loopback test that validates the full TX->RX round trip including frame recovery with 30 dB AWGN.	2026-02-21 18:55:50 -07:00
Ryan Malloy	0ee7ff0ad7	Implement full Apollo USB downlink decoder chain Complete signal processing pipeline from complex baseband to decoded PCM telemetry, verified against the 1965 NAA Study Guide (A-624): Core demod (Phase 1): - PM demodulator with carrier PLL recovery - 1.024 MHz subcarrier extractor (bandpass + downconvert) - BPSK demodulator with Costas loop + symbol sync - Convenience hier_block2 combining subcarrier + BPSK PCM frame processing (Phase 2): - 32-bit frame sync with Hamming distance correlator - SEARCH/VERIFY/LOCKED state machine, complement-on-odd handling - Frame demultiplexer (128-word, A/D voltage scaling) - AGC downlink decoder (15-bit word reassembly from DNTM1/DNTM2) Voice and analog (Phase 3): - 1.25 MHz FM voice subcarrier demod to 8 kHz audio - SCO demodulator for 9 analog sensor channels (14.5-165 kHz) Virtual AGC integration (Phase 4): - TCP bridge client with auto-reconnect and channel filtering - DSKY uplink encoder (VERB/NOUN/DATA command sequences) Top-level receiver (Phase 5): - usb_downlink_receiver hier_block2: one block, complex in, PDUs out - 14 GRC block YAML definitions for GNU Radio Companion - Example scripts for signal analysis and full-chain demo Infrastructure: - constants.py with all timing/frequency/frame parameters - protocol.py for sync word + AGC packet encode/decode - Synthetic USB signal generator for testing - 222 tests passing, ruff lint clean	2026-02-20 13:18:42 -07:00

Author

SHA1

Message

Date

Ryan Malloy

cd3a8cc6be

Add SCO modulator, external audio input, and demo scripts

- sco_mod: 9-channel FM subcarrier oscillator modulator (inverse of sco_demod),
  with round-trip tests proving voltage recovery across all channels
- fm_voice_subcarrier_mod: add audio_input parameter to accept external float
  streams (e.g., Apollo mission voice recordings) instead of internal test tone
- loopback_demo.py: streaming TX->RX round-trip with CLI for noise/voice/frames
- agc_loopback_demo.py: full Virtual AGC integration via TCP bridge

2026-02-22 13:01:48 -07:00

Ryan Malloy

493c21c511

Add transmit chain: 6 composable GR source blocks mirroring CuriousMarc bench

Implement the transmit/generate side as streaming GNU Radio blocks,
complementing the existing receive chain. Each block maps to a physical
instrument on CuriousMarc's Keysight bench:

  pcm_frame_source  - PCM bit stream generator (sync_block + FrameSourceEngine)
  nrz_encoder       - bits to NRZ waveform (+1/-1) with upsampling
  bpsk_subcarrier_mod - NRZ x cos(1.024 MHz) BPSK modulator
  fm_voice_subcarrier_mod - 1.25 MHz FM test tone source
  pm_mod            - phase modulator: exp(j * deviation * input)
  usb_signal_source - convenience wrapper wiring all blocks together

Includes GRC YAML definitions for all blocks under [Apollo USB] category,
49 new tests (271 total, all passing), and a loopback test that validates
the full TX->RX round trip including frame recovery with 30 dB AWGN.

2026-02-21 18:55:50 -07:00

Ryan Malloy

0ee7ff0ad7

Implement full Apollo USB downlink decoder chain

Complete signal processing pipeline from complex baseband to decoded
PCM telemetry, verified against the 1965 NAA Study Guide (A-624):

Core demod (Phase 1):
  - PM demodulator with carrier PLL recovery
  - 1.024 MHz subcarrier extractor (bandpass + downconvert)
  - BPSK demodulator with Costas loop + symbol sync
  - Convenience hier_block2 combining subcarrier + BPSK

PCM frame processing (Phase 2):
  - 32-bit frame sync with Hamming distance correlator
  - SEARCH/VERIFY/LOCKED state machine, complement-on-odd handling
  - Frame demultiplexer (128-word, A/D voltage scaling)
  - AGC downlink decoder (15-bit word reassembly from DNTM1/DNTM2)

Voice and analog (Phase 3):
  - 1.25 MHz FM voice subcarrier demod to 8 kHz audio
  - SCO demodulator for 9 analog sensor channels (14.5-165 kHz)

Virtual AGC integration (Phase 4):
  - TCP bridge client with auto-reconnect and channel filtering
  - DSKY uplink encoder (VERB/NOUN/DATA command sequences)

Top-level receiver (Phase 5):
  - usb_downlink_receiver hier_block2: one block, complex in, PDUs out
  - 14 GRC block YAML definitions for GNU Radio Companion
  - Example scripts for signal analysis and full-chain demo

Infrastructure:
  - constants.py with all timing/frequency/frame parameters
  - protocol.py for sync word + AGC packet encode/decode
  - Synthetic USB signal generator for testing
  - 222 tests passing, ruff lint clean

2026-02-20 13:18:42 -07:00

3 Commits