Compare the raw pitch trend with geographic predictions
The raw gyroscope plot shows accumulated pitch-axis increments without a fitted calibration or GPS subtraction. Its companion will ask a different question: does the variation between recordings follow predictions made from their course, speed and latitude?
An IMU (inertial measurement unit) measures turning with gyroscopes and specific force with accelerometers. Here the recorded gyro increments remain the turning observations. Receiver positions supply the trajectory context for the predictions; they do not supply a replacement gyro signal.
A transparent reference prediction
For a level aircraft whose nose follows its ground course, the globe transport
contribution around its right-pointing axis is approximately -speed/radius.
The specified background field adds -Omega*cos(latitude)*sin(course).
The flat candidate's transport is a vertical yaw contribution, with no pitch
component under these level-flight assumptions. The exact companion will retain
the declared candidate metrics, rather than use this approximation silently.
This calculation must show its assumptions. Aircraft heading can differ from ground course, roll and pitch can project yaw onto the recorded pitch axis, and genuine aircraft pitching remains in the raw sum. A sensitivity envelope may vary declared attitude/crab assumptions, but cannot call them measured. Possible upstream field removal is shown separately and equally for candidates.
Planned output and controls
- Use all 53 saved intervals and their hash-checked gyro bins; keep overlapping recorders in their supported shared-track groups.
- Preserve the original raw plot. Add predicted versus observed signed rates and accumulated angles, with course, latitude, speed, duration and mount provenance available for every point.
- Label an aircraft-motion contribution as unresolved when independent heading or attitude is missing. Do not subtract fused Group-1 attitude and then call the remainder independent evidence.
- Test north/south and east/west limits, reversed headings, hemisphere changes, mount-axis signs, nonzero crab/tilt and processing alternatives using independent analytic controls before publishing calculated points.
- Report agreement and disagreement descriptively. A common sign, fitted orientation or geographic cluster is not an independent vote or a calibrated curvature detection.
Freeze generated controls, data identities and a finite allowance before execution. No new physical-model fits are needed. This diagnostic does not replace withheld prediction, uncertainty assessment or the planned free-field measurement.