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Generate Corridor

Overview​

Generate Corridor builds an Average Signal and creates matching upper and lower corridor bounds from selected curves.

In WebSAT, the Corridor Type options are:

  1. Standard Deviation of Residuals
  2. Residual Coverage Corridor

Required Inputs​

  • Two or more selected curves
  • Curves with matching signal units
  • Corridor Type
    • Standard Deviation of Residuals, or
    • Residual Coverage Corridor
  • Number of Standard Deviations (1-3)
    • Used when Corridor Type is Standard Deviation of Residuals
  • Residual Coverage % (0-99.9)
    • Used when Corridor Type is Residual Coverage Corridor
  • Apply Filter (optional)
  • Filter CFC
    • 60, 180, 600, or 1000

Calculation​

  1. Harmonize the selected curves and optionally apply filtering.
  2. Time-align the curves so they can be compared point-by-point.
  3. Compute the average signal to use as the corridor centerline.
  4. Compute residual spread from the difference between each curve and the centerline.
  5. Convert residual spread into corridor width.
    • Standard Deviation of Residuals uses the selected number of standard deviations (1-3).
    • Residual Coverage Corridor uses a normal-distribution scale factor based on Residual Coverage %.
  6. Build upper and lower bounds symmetrically around the centerline.

For Residual Coverage Corridor, a 90% setting corresponds to a scale factor of about 1.6449.

Output​

Generate Corridor returns three curves:

  1. Average Signal
  2. Upper corridor bound
  3. Lower corridor bound

In the plot legend, the corridor band label follows the selected type:

  • Residual Coverage Corridor: N% Residual Coverage
  • Standard Deviation of Residuals: +/-N SD Corridor

The centerline varies over time, while corridor width remains constant across the full signal.

Result Accordions in WebSAT​

Generate Corridor results are shown in three accordion sections:

  1. CORRIDOR PLOT: Displays the corridor plot with the Average Signal and corridor bounds, plus a settings summary label such as Residual Coverage: N% or Standard Deviation Corridor Size: +/-N SD.
  2. CORRIDOR INPUT SIGNALS: Lists the selected input instrumentation rows used to build the corridor so you can verify exactly which curves were used for the calculation, including fields like test, curve, location, attachment, axis, sensor type, data status, channel status, and commentary.
  3. INSTRUMENTATION CHANNELS: Shows the channel-level table used for signal selection/filtering so you can plot same-unit signals against the corridor and visually compare each curve to the corridor bounds.