Boresight Settings

Axes/System Definition

System

The selection made here defines the ground coordinate system to which the omega, phi and kappa values are oriented. Normally, they are referenced to a map projection which is defined in the Grid/Map Definition settings.

Order

This setting defines the order in which the omega, phi and kappa angles are to be applied during the transformation from the ground system to the image or IMU system. Only the omega-primary, phi-secondary and kappa-tertiary rotation order is supported.

Axes

Use this setting to define the orientation of the image system. The most commonly used system is the conventional frame, where the x-axis points forward, the y-axis points left, and the z-axis points upwards. The frame defined here determines the composition of the R_c matrix.

Grid/Map Definition

The options made available here depend on the system definition chosen. If the input angle was provided with respect to a map grid, then the selection made here determines the convergence value, α, used to form the R_g matrix. In addition, grid users are given the opportunity to enter the average ground height in order to maximize accuracy.

Measurement Weighting

The selections made here determine the composition of the variance-covariance matrix used in the least squares procedure to derive the final boresighting values. Choose to enter a set of constant standard deviation values to apply to all measurements, or have the values derived from either the navigation SD values, the photo SD values (if provided), or a combination of both.

The other setting here pertains to the outlier tolerance. The value specified here determines at which point a measurement is removed from the least squares procedure.

Display Units

These options pertain to the values displayed in the Solve Boresight Angle window and determine which units are used when writing to the Boresight Report file. These options also allow the number of decimal places to which all values are displayed or written to be modified.