SIGNAL ANALYSIS // MOTION PHYSICS // EXPERIMENT 01

Listen to the physics you cannot see.

Inspect your own audio in a time–frequency spectrogram, manually examine tonal tracks, and simulate physically modeled aircraft Doppler signatures. Audio processing stays in your browser.

PRIVACY-FIRST RESEARCHLearn how ambient aircraft noise can carry clues. This lab intentionally does not derive real-world recording coordinates or query flight-history databases.

01 / SOURCELOCAL AUDIO

↑ DROP / CHOOSE AUDIOWAV · MP3 · M4A · OGG · WEBM
Max 50 MB · first 180 seconds

Loading built-in flyover example…

PLAYHEAD00:00.0

Select a position on the spectrogram to inspect or start playback there.

02 / PARAMETERSLIVE MODEL

AIRSPEED

ALTITUDE

LATERAL OFFSET

EMITTED FREQUENCY

AIR TEMPERATURE

OVERLAY CENTER

Controls update the mathematical overlay and top-down path in real time. The overlay is a demonstration, not an aircraft identification.

03 / SIGNAL SPECTROGRAM

GRID

Duration—seconds

Sample rate—kHz

Selected frequency—Hz

FFT resolution—Hz/bin

FREQUENCY · LOG SCALE · 50–1200 HzTIME → 0–18 s

WAVEFORM · AMPLITUDEMOVE CURSOR TO MEASURE

━━ Physics-predicted tonal curve ━━ Strongest observed spectral band. Neither alone establishes an aircraft source.

Initializing signal engine…

04 / PROPAGATION MODELPHYSICS-BASED · SYNTHETIC PATH · NOT A MAP

TOP VIEW · GROUND DISTANCECPA 330 m

RECEIVED FREQUENCYPROPAGATION DELAY INCLUDED

05 / TELEMETRYLIVE

Sound speed—

Minimum slant range—

Closest approach—

Approach shift · ±11s—

Recession shift · ±11s—

One-way delay at CPA—

Model speed ratio—

Cursor time—

Cursor frequency—

06 / EQUATIONSMEASUREMENT MODEL

c ≈ 331.3 + 0.606 T
R(t) = √[(v t)² + d²]
vᵣ(t) = v² t / R(t)
fᵣ(t) = f₀ c / (c + vᵣ)
tₐ = tₑ + R(tₑ)/c

The plane is modeled as a constant-speed point source at constant altitude, over stationary air. d is the hypotenuse of altitude and lateral offset. Sound is observed after propagation delay. Real aircraft emit multiple harmonics, broadband noise, and variable propulsion signatures.

Saved parameters are stored only in this browser (localStorage). Recorded or uploaded audio is never saved or transmitted.

07 / RESEARCH CONTEXTLIMITATIONS

Inspired by Colsto's November 2026 aircraft-acoustics demonstration. This educational workbench offers actual STFT analysis, a synthetic Doppler predictor, manual alignment, and audio auditioning.

It does not integrate ADS-B histories, perform location scoring, or identify individuals or filming sites.

WATCH ORIGINAL RESEARCH ↗

DOPPLER / LAB v1.0 · HAGOP.IO / FLAGSHIP · HTML5 CANVAS + WEB AUDIO · NO SERVER REQUIREDAll analyses run locally. Back to the project index