| 摘要 |
<p>Independent guidance and monitoring to be integrated into an MLS landing system and also provides a scaled-down MLS landing guidance system useable at small airports. In both cases an added fixed beam precision guidance system is integrated into the MLS time sequence format. The fixed beam guidance system is based upon the concept of using paired fixed overlapping beams (31, 32 and 33, 34), sequentially radiated by different fixed antennas (80, 81 and 89, 90). One pair (31, 32) is oriented to left and right of the centerline (36) of the runway, and the other pair (89, 90) is oriented above and below the desired glideslope (36'). The first set of paired beams overlap at the centerline (36) of the runway in such a manner that an aircraft approaching exactly on centerline (36) will intercept equal signal intensities to indicate and on-course approach. Conversely when the aircraft is off-course to one side of the centerline (35), it will intercept a stronger signal intensity for the fixed guidance beam (31) which is directed to that side of the centerline and a weaker signal intensity for the fixed beam (32) which is directed to the other side of the centerline. Similar operation is provided by the overlapped guidance beams (33, 34) operating in the elevation mode.</p> |
