Ryan Malloy
7d48398551
FM mode now has the same three-layer architecture as PM mode: - fm_mod/fm_demod for carrier-level FM modulation - fm_signal_source/fm_downlink_receiver convenience wrappers - fm_loopback_demo.py verifying round-trip SCO voltage recovery Includes GRC YAML for all 4 blocks and doc updates across blocks reference, SCO guide, and signal architecture pages.
64 lines
1.7 KiB
YAML
64 lines
1.7 KiB
YAML
id: apollo_fm_downlink_receiver
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label: Apollo FM Downlink Receiver
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category: '[Apollo USB]'
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flags: [python]
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parameters:
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- id: channels
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label: SCO Channels
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dtype: raw
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default: '[1, 5, 9]'
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- id: fm_deviation_hz
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label: FM Deviation (Hz)
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dtype: real
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default: '500000'
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- id: sample_rate
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label: Sample Rate
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dtype: float
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default: '5120000'
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- id: carrier_pll_bw
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label: Carrier PLL BW
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dtype: float
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default: '0.02'
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inputs:
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- label: in
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domain: stream
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dtype: complex
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outputs:
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- label: ch${n}
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domain: stream
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dtype: float
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multiplicity: ${ len(channels) }
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templates:
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imports: from apollo.fm_downlink_receiver import fm_downlink_receiver
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make: >-
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apollo.fm_downlink_receiver.fm_downlink_receiver(
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channels=${channels},
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sample_rate=${sample_rate},
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carrier_pll_bw=${carrier_pll_bw},
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fm_deviation_hz=${fm_deviation_hz})
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documentation: |-
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Apollo FM Downlink Receiver -- complete FM demod chain in one block.
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Demodulates an FM-modulated complex baseband signal and recovers
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individual SCO analog telemetry channels. Each output port provides
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a recovered 0-5V sensor voltage for the corresponding SCO channel.
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Output port ordering matches the channels list:
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output 0 = channels[0], output 1 = channels[1], etc.
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Used in FM downlink mode (pre-launch checkout), not PM mode.
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This is the receive-side counterpart to the FM Signal Source.
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Parameters:
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channels: List of SCO channel numbers to decode (1-9)
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fm_deviation_hz: Expected carrier FM deviation in Hz (default 500 kHz)
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sample_rate: Baseband sample rate (default 5.12 MHz)
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carrier_pll_bw: FM carrier recovery loop bandwidth
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file_format: 1
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