Ryan Malloy
0e77373ea4
Uplink word codec (uplink_word_codec.py): - UplinkSerializerEngine: (channel, value) pairs to 15-bit NRZ bit stream with configurable inter-word gap for UPRUPT timing - UplinkDeserializerEngine: two-phase state machine (acquisition + fixed framing) recovers words from NRZ bits, handles leading-zero data words - GR wrappers: uplink_word_serializer (sync_block source) and uplink_word_deserializer (basic_block sink with message output) TX source (usb_uplink_source.py): - hier_block2 wiring: word_serializer -> nrz_encoder -> FM mod (4 kHz dev) -> 70 kHz upconvert -> complex_to_real -> PM mod (1.0 rad) -> [AWGN] - Message input "words" forwards PDUs from uplink_encoder RX receiver (usb_uplink_receiver.py): - hier_block2 wiring: PM demod -> subcarrier_extract (70 kHz, 20 kHz BW) -> quadrature_demod -> matched filter -> decimate -> slicer -> deserializer - Message output "commands" emits recovered (channel, value) PDUs GRC block definitions for both source and receiver. Loopback demo (uplink_loopback_demo.py): - Encodes V16N36E, serializes with pure-Python engine, runs through GR RF chain (FM + PM + noise + demod), deserializes, compares TX vs RX words
58 lines
1.4 KiB
YAML
58 lines
1.4 KiB
YAML
id: apollo_usb_uplink_receiver
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label: Apollo USB Uplink Receiver
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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: Uplink Bit Rate
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dtype: int
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default: '2000'
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- id: carrier_pll_bw
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label: Carrier PLL Bandwidth
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dtype: float
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default: '0.02'
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- id: subcarrier_bw
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label: Subcarrier Bandwidth (Hz)
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dtype: float
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default: '20000'
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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: commands
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domain: message
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templates:
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imports: from apollo.usb_uplink_receiver import usb_uplink_receiver
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make: >-
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apollo.usb_uplink_receiver.usb_uplink_receiver(
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sample_rate=${sample_rate},
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bit_rate=${bit_rate},
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carrier_pll_bw=${carrier_pll_bw},
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subcarrier_bw=${subcarrier_bw})
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documentation: |-
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Apollo USB Uplink Receiver -- spacecraft command receiver.
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Demodulates uplink commands from complex baseband:
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PM demod -> 70 kHz subcarrier extract -> FM demod -> bit recovery -> word assembly
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Message output:
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commands -- decoded (channel, value) PDUs for AGC bridge
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Parameters:
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sample_rate: Input sample rate (default 5.12 MHz)
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bit_rate: Expected uplink data rate (default 2000 bps)
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carrier_pll_bw: PM carrier recovery loop bandwidth (default 0.02)
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subcarrier_bw: 70 kHz subcarrier filter bandwidth (default 20 kHz)
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file_format: 1
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