Ryan Malloy
493c21c511
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.
48 lines
1.2 KiB
YAML
48 lines
1.2 KiB
YAML
id: apollo_pcm_frame_source
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label: Apollo PCM Frame Source
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category: '[Apollo USB]'
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flags: [python]
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parameters:
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- id: bit_rate
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label: Bit Rate (bps)
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dtype: int
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default: '51200'
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options: ['51200', '1600']
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option_labels: ['High (51.2 kbps)', 'Low (1.6 kbps)']
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inputs:
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- label: frame_data
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domain: message
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optional: true
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outputs:
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- label: out
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domain: stream
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dtype: byte
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templates:
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imports: from apollo.pcm_frame_source import pcm_frame_source
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make: apollo.pcm_frame_source.pcm_frame_source(bit_rate=${bit_rate})
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documentation: |-
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Apollo PCM Frame Source
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Generates a continuous stream of NRZ-encoded PCM telemetry frame bits
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(byte values 0 or 1). Frame IDs cycle 1 through 50 automatically,
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with the 15-bit sync core complemented on odd-numbered frames.
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This is the transmit-side counterpart to the PCM Frame Sync block.
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The sync word format is:
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[5-bit A][15-bit core][6-bit B][6-bit frame ID]
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An optional message input (frame_data) accepts u8vector payloads that
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will be used as data words for the next generated frame. Without
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injected data, frames carry zero-fill.
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Parameters:
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bit_rate: 51200 (128 words/frame, 50 fps) or 1600 (200 words/frame, 1 fps)
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file_format: 1
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