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.
45 lines
994 B
YAML
45 lines
994 B
YAML
id: apollo_pm_mod
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label: Apollo PM Mod
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category: '[Apollo USB]'
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flags: [python]
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parameters:
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- id: pm_deviation
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label: PM Deviation (rad)
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dtype: real
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default: '0.133'
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- id: sample_rate
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label: Sample Rate
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dtype: real
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default: '5120000'
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inputs:
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- label: in
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domain: stream
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dtype: float
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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.pm_mod import pm_mod
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make: apollo.pm_mod.pm_mod(pm_deviation=${pm_deviation}, sample_rate=${sample_rate})
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documentation: |-
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Apollo PM Modulator
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Applies phase modulation to produce complex baseband signal.
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Takes a composite modulating signal (sum of subcarriers) and outputs
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s(t) = exp(j * pm_deviation * input(t)).
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The spacecraft PM deviation is 0.133 rad (7.6 degrees) peak.
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This is the transmit-side counterpart to Apollo PM Demod.
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Parameters:
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pm_deviation: Peak phase deviation in radians (default 0.133)
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sample_rate: Sample rate in Hz (default 5.12 MHz)
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file_format: 1
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