A calibration method, comprising: providing a mounting fixture including a tray coupled to a frame, and an alignment measurement sensor removably coupled to the tray, the alignment measurement sensor comprising a pitch axis, a roll axis, and a yaw axis; determining an angular orientation of the tray using the alignment measurement sensor removably coupled to the tray in a first position; moving the alignment measurement sensor to a second position on the tray that is rotated 180 degrees from the first position about a first of the pitch axis, the roll axis, or the yaw axis of the alignment measurement sensor; determining the angular orientation of the tray using the alignment measurement sensor at the second position; calculating an axis misalignment for at least the other two of the pitch axis, the roll axis, and the yaw axis of the alignment measurement sensor to determine one or more misalignment factors, wherein the axis misalignment is calculated as: axis misalignment = axis @ first position + axis @ second position + relative angular offset error / 2; where the axis@first position and the axis@second position include measured angles of the pitch axis, of the roll axis, or of the yaw axis, when said alignment measurement sensor is at the first position and at the second position respectively; and where the relative angular offset error is a known difference in the fixture's axis for which misalignment is being calculated for the first and second positions; and applying the one or more misalignment factors to correct for misalignment of the alignment measurement sensor. providing a mounting fixture including a tray coupled to a frame, and an alignment measurement sensor removably coupled to the tray, the alignment measurement sensor comprising a pitch axis, a roll axis, and a yaw axis; determining an angular orientation of the tray using the alignment measurement sensor removably coupled to the tray in a first position; moving the alignment measurement sensor to a second position on the tray that is rotated 180 degrees from the first position about a first of the pitch axis, the roll axis, or the yaw axis of the alignment measurement sensor; determining the angular orientation of the tray using the alignment measurement sensor at the second position; calculating an axis misalignment for at least the other two of the pitch axis, the roll axis, and the yaw axis of the alignment measurement sensor to determine one or more misalignment factors, wherein the axis misalignment is calculated as: axis misalignment = axis @ first position + axis @ second position + relative angular offset error / 2; where the axis@first position and the axis@second position include measured angles of the pitch axis, of the roll axis, or of the yaw axis, when said alignment measurement sensor is at the first position and at the second position respectively; and where the relative angular offset error is a known difference in the fixture's axis for which misalignment is being calculated for the first and second positions; and where the axis@first position and the axis@second position include measured angles of the pitch axis, of the roll axis, or of the yaw axis, when said alignment measurement sensor is at the first position and at the second position respectively; and where the relative angular offset error is a known difference in the fixture's axis for which misalignment is being calculated for the first and second positions; and applying the one or more misalignment factors to correct for misalignment of the alignment measurement sensor.