Meaning
Deviation from the intended electromagnetic axis represents the offset between the physical mechanical center and the maximum gain direction. A boresight angle error occurs when manufacturing tolerances or assembly shifts cause the main lobe of the radiation pattern to tilt. Precision radar and satellite systems rely on minimizing this variance to maintain tracking accuracy.
Alignment during the mounting process often introduces small angular displacements that degrade system performance and reduce the reliability of the spatial data.
Alignment Offset
Digital beamforming coefficients provide a software-based method to realign the signal path. Calibration routines for boresight angle error measure the peak intensity across a range of coordinates and apply a phase offset to the antenna elements. This adjustment compensates for structural imperfections in the enclosure.
Thermal Drift
Thermal expansion and vibration during operation contribute to dynamic shifts in the pointing direction. Even a rigid mount might experience boresight angle error if the material choice fails to handle temperature gradients across the board. Stiffening the chassis or using low-expansion alloys mitigates these environmental effects.
Boresight Correction
Measurement in an anechoic chamber yields the data required to quantify the shift. The boresight angle error is recorded by rotating the device under test until the highest power level is located on the far-field range. Results populate the lookup table used by the controller to ensure the beam remains centered on the target.
