This is visible on this picture of the array taken from its NW: In the case of I-PKN, the signal is not sent by the back of the antennas, but by the front, like a regular LOC/ILS approach. It's only use is during the missed approach. It's not a back-course in the sense it would give an additional access to the opposed runway for free, like other localizers do using the back lobes of their antennas. I-KPN course is referred to as a "back-course". I-KPN directed at 301° is used in the missed approach trajectory to provide the guidance to return to the holding via LINDZ waypoint. Aspen has a LOC/DME approach based on two localizers: I-ASE classic, directed at 331°, is used to land and has no back-course. If so, are there any airports where this has been done?Īspen back-course localizer I-KPN which motivates your question is possibly one of these localizers with inverted signal. While the very usual case is the back-course is sent using the back lobe (making back-course and back lobe near synonymous), in the unusual I-PKN, the front lobe is used to create a back course guidance. One related to the approach procedure, the back-course, which refers to the direction opposite to the approach the localizer is primarily used for.One related to the antenna, the back lobe, which is the area where the antenna radiates rearward, as many antennas do.In this section I'm going to separate two concepts: See this array diagram showing signal amplitude and phase for each course and clearance antenna. As the inputs are symmetrical relatively to the array center, except the SBO phase, practically we would just have to invert SBO phase. This boils down to swapping the antenna inputs. Localizer array at Melbourne airport (seen from the back), source Conceptually this is obtained by reversing the order of the individual antennas of the localizer array, the leftmost antenna becomes the rightmost antenna, etc. Can we reverse the guidance from the transmitter?Ĭan a Localizer Backcourse signal be reversed (at the site antenna)?įrom a technical standpoint it's entirely possible, but both beams, front and back, are reversed at the same time.
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