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.
81 lines
2.1 KiB
YAML
81 lines
2.1 KiB
YAML
id: apollo_usb_signal_source
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label: Apollo USB Signal Source
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category: '[Apollo USB]'
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flags: [python]
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parameters:
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- id: sample_rate
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label: Sample Rate (Hz)
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dtype: float
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default: '5120000'
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- id: bit_rate
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label: PCM Bit Rate
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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: ['51.2 kbps (high rate)', '1.6 kbps (low rate)']
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- id: pm_deviation
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label: PM Deviation (rad)
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dtype: float
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default: '0.133'
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- id: voice_enabled
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label: Voice Subcarrier
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dtype: bool
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default: 'False'
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options: ['True', 'False']
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option_labels: ['Enabled', 'Disabled']
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- id: voice_tone_hz
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label: Voice Test Tone (Hz)
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dtype: float
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default: '1000'
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- id: snr_db
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label: SNR (dB)
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dtype: raw
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default: 'None'
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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: complex
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templates:
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imports: from apollo.usb_signal_source import usb_signal_source
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make: >-
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apollo.usb_signal_source.usb_signal_source(
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sample_rate=${sample_rate},
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bit_rate=${bit_rate},
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pm_deviation=${pm_deviation},
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voice_enabled=${voice_enabled},
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voice_tone_hz=${voice_tone_hz},
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snr_db=${snr_db})
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documentation: |-
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Apollo USB Signal Source -- complete transmit chain in one block.
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Generates a PM-modulated complex baseband signal containing:
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- 1.024 MHz BPSK subcarrier with PCM telemetry frames
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- Optional 1.25 MHz FM voice subcarrier (test tone)
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- Optional AWGN noise
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This is the transmit-side counterpart to the USB Downlink Receiver.
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It mirrors CuriousMarc's bench: individual composable blocks wired
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together as one convenience wrapper.
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Message input:
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frame_data -- inject custom payload bytes for the next PCM frame
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Parameters:
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sample_rate: Output sample rate (default 5.12 MHz)
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bit_rate: PCM bit rate -- 51200 (high) or 1600 (low)
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pm_deviation: Peak PM deviation in radians (default 0.133)
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voice_enabled: Include 1.25 MHz FM voice subcarrier
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voice_tone_hz: Voice test tone frequency in Hz
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snr_db: Add AWGN noise at this SNR (None = no noise)
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file_format: 1
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