In some embodiments, the method for boresighting a system under test (SUT) involves radiating, by the SUT, an illuminating signal(s) to a target, where the illuminating signal(s) is radiated onto an external screen of the target. The method further involves detecting, by an external detector(s), the illuminating signal(s) radiated onto the external screen to produce an external detector measurement. Also, the method involves aligning the SUT by using the external detector measurement. In addition, the method involves radiating, by the SUT, the illuminating signal(s) to the target, where the illuminating signal(s) is radiated through an opening located on a side of the target and onto an internal screen of the target. Additionally, the method involves detecting, by an internal detector(s) of the target, the illuminating signal(s) radiated onto the internal screen to produce an internal detector measurement. Further, the method involves aligning the SUT by using the internal detector measurement.