Ryan Malloy
0ee7ff0ad7
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
63 lines
1.3 KiB
YAML
63 lines
1.3 KiB
YAML
id: apollo_bpsk_subcarrier_demod
|
|
label: Apollo BPSK Subcarrier Demod
|
|
category: '[Apollo USB]'
|
|
flags: [python]
|
|
|
|
parameters:
|
|
- id: subcarrier_freq
|
|
label: Subcarrier Frequency (Hz)
|
|
dtype: real
|
|
default: '1024000'
|
|
- id: bandwidth
|
|
label: Bandwidth (Hz)
|
|
dtype: real
|
|
default: '150000'
|
|
- id: bit_rate
|
|
label: Bit Rate (bps)
|
|
dtype: real
|
|
default: '51200'
|
|
- id: sample_rate
|
|
label: Sample Rate (Hz)
|
|
dtype: real
|
|
default: '5120000'
|
|
- id: decimation
|
|
label: Decimation Factor
|
|
dtype: int
|
|
default: '1'
|
|
- id: loop_bw
|
|
label: Loop Bandwidth
|
|
dtype: real
|
|
default: '0.045'
|
|
|
|
inputs:
|
|
- label: in
|
|
domain: stream
|
|
dtype: float
|
|
|
|
outputs:
|
|
- label: out
|
|
domain: stream
|
|
dtype: byte
|
|
|
|
templates:
|
|
imports: from apollo import bpsk_subcarrier_demod
|
|
make: >-
|
|
apollo.bpsk_subcarrier_demod.bpsk_subcarrier_demod(
|
|
subcarrier_freq=${subcarrier_freq},
|
|
bandwidth=${bandwidth},
|
|
bit_rate=${bit_rate},
|
|
sample_rate=${sample_rate},
|
|
decimation=${decimation},
|
|
loop_bw=${loop_bw})
|
|
|
|
documentation: |-
|
|
Apollo BPSK Subcarrier Demodulator
|
|
|
|
Convenience block combining subcarrier extraction and BPSK demodulation.
|
|
Extracts the 1.024 MHz BPSK PCM subcarrier from PM demod output and
|
|
recovers the NRZ bit stream.
|
|
|
|
This is equivalent to subcarrier_extract → bpsk_demod in series.
|
|
|
|
file_format: 1
|