The MLS provides precision navigation guidance for the exact alignment and descent of aircraft on the approach to a runway. It provides azimuth, elevation, and distance. It employs 5 GHz transmitters at the landing location which use passive electronically scanned arrays to send scanning beams towards approaching aircraft. An aircraft that enters the scanned volume uses a special receiver that calculates its position by measuring the arrival times of the beams.
MLS advantages over ILS, including a wider selection of channels to avoid interference with nearby installations, excellent all-weather performance and wide vertical and horizontal “capture” angles that allowed approaches from wider airport areas.
The azimuth station transmits MLS angle and data on one of 200 channels within the 5031 to 5090.7 MHz frequency.
Located about 1,000 feet (300 m) beyond the stop end of the runway and covers at least 37 km.
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