Stage 01Input
Capture the signature
Import audio, inspect the 5–800 Hz spectrogram, and label the timeline with silence, Doppler curves and indifference.
In the input layer
Stage 01 · inputUK airspaceadsb.lol tracks
Hear a plane.
Find its sky.
PropBrains matches the low-frequency signature of a propeller aircraft against a day of real flight tracks — then solves for the position that fits.
Silence · curve · indifference · one sky
Spectrogram / 5–800 Hz120 s silence
01 / The timing constraint
The gap is the clue.
A recording gives you moments, not a position. A curve says an aircraft was audible; a silence section says none was. Two curves separated by 120 seconds of silence rule out every aircraft that cannot be in two places at once.
Two curves, one silenceSilence is the clue
Curve A · 00:20.000One aircraftA low-frequency propeller pass.
Silence · 120 secondsNo aircraftA hard exclusion between the two curves.
Curve B · 02:20.000A new aircraftThe second pass must be someone else.
If the timing cannot fit one airframe, it has to fit two.
02 / The pipeline
From a recording to a position.
Four stages, each one cutting the search space. The input layer is stage 01; the rest are being built on top of the same session model.
Stage 02Next
Narrow the sky
Pull the day's non-jet tracks and keep the aircraft that can satisfy the silence-and-curve timing.
Queued
Stage 03Planned
Simulate the rest
Synthesize the remaining candidates and compare their acoustic signature to the recording.
Queued
Stage 04Planned
Solve with terrain
Add a UK heightmap so altitude and ground profile can correct the final position.
Queued
03 / The data
Real tracks, not a toy map.
The companion pipeline turns a day of adsb.lolglobe_history into slim per-country 3D tracks: non-jets only, exact coordinates, every leg duplicated into the countries it crosses.
- 72,092
- aircraft in the day
- 28,559
- non-jet aircraft
- 1.24 M
- UK track points
adsb.lol globe_history · 2026-11-04 · ODbL / CC0
Session snapshotUK
Date2026-11-04
RegionUnited Kingdom
Non-jet legs2,820
Track points1,244,758
Sourceadsb.lol
This is the sky the lab will search.
The input layer is open
Open the lab →