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monad-knowledge Wi-Fi sensing lab · FIIT STU

The research instrument

From radio to evidence.

Follow the data through capture, storage, processing and evaluation. Inspect a component for its readings, dependencies and the evidence behind its status.

The interactive map adds component selection, zoom and a guided walkthrough when JavaScript is available.

  1. Radios & recorders Channel measurements are recorded to local binary captures.
  2. Capture archive Sealed segments are uploaded to object storage.
  3. Decode & ingest Binary records become rows.
  4. Measurement lake Parquet tables hold queryable measurements.
  5. Minute reductions Decoded records become per-receiver summaries in blocks; motion is another derived product.
  6. Detection & fusion Baselines, detection methods and receiver aggregation produce estimates.
  7. Evaluation Labels, episodes, empty-night false alarms and drift diagnostics support interpretation.
  8. Research portal Snapshots and experiments publish the resulting evidence.
  1. Radio 11 nodes reporting
  2. Sealed 25,076 segments the lake knows
  3. Never decoded 49 not yet decoded into packet rows
  4. Below current schema 0 decoded, awaiting re-reduction
  5. Queryable 25,027 at the current reduction schema

99.8% of sealed segments are at the current reduction schema. The rest are queued; the decoder works through them continuously.

The ingest lock is free. No writer is holding the lake.

Node Doing now Estimates/s Segments Decoded Queued Progress
monad-knowledge No capture reported — — — — —
monad01 Capturing at 0.2 Hz 0.2 2,869 2,868 1
monad02 Capturing at 250.2 Hz 250.2 2,373 2,368 5
monad03 Capturing at 250.1 Hz 250.1 2,591 2,583 8
monad04 Capturing at 250.1 Hz 250.1 2,656 2,653 3
monad05 Capturing at 250.1 Hz 250.1 2,695 2,688 7
monad06 Capturing at 250.2 Hz 250.2 2,434 2,425 9
monad07 Capturing at 250.0 Hz 250.0 2,558 2,557 1
monad08 Capturing at 250.1 Hz 250.1 2,409 2,406 3
monad09 Capturing at 250.0 Hz 250.0 2,039 2,031 8
monad10 Capturing at 250.3 Hz 250.3 2,452 2,448 4
What the lake holds — 5 tables
Table Files Size Average file
sessions 42 0.1 GB 1.5 MB
timesync 4,563 71.3 GB 15.6 MB
ble 3,773 3.5 GB 0.9 MB
packets 25,427 249.2 GB 9.8 MB
fleet_ops 760 0.0 GB 0.0 MB

A lake table is Parquet on object storage. Many small files are slower to read than few large ones, because each is a separate request over the network — which is why the average-file column is here and not a detail.

Pipeline figures built 12 s ago. Node state is live at 30 s.

Processing and evaluation

Published analysis snapshot: 4 methods, 4 labels, 555 detection episodes. This is output inventory, not a validation verdict.

Source build: .

  • Envelope, our transmitter only
  • Doppler 20–60 Hz, our transmitter only
  • Delivered-rate collapse
  • Envelope, every transmitter

Inspect detection methods, calibration and evaluation.

Three clocks. Fleet telemetry refreshes at 30 s. Lake inventory is built every minute and marked stale after three minutes. Processing and evaluation read a separately built analysis snapshot; its build time is shown explicitly.

What a status means. A queue is work waiting, a lock can be useful work, and a published output is not a validation verdict. Unknown readings stay unknown. Open the detector instrument for methods and evaluation, or the published JSON for the readings behind this map.