Communications: electrical – Aircraft alarm or indicating systems – Land-based landing guidance
Patent
1984-07-27
1987-03-03
Rowland, James L.
Communications: electrical
Aircraft alarm or indicating systems
Land-based landing guidance
364429, 377 28, 377 52, 377107, 342372, 342 7, G08G 500, G06M 300
Patent
active
046479260
ABSTRACT:
A system to provide warning whenever unreliable data is being received by an airborne receiver for a microwave landing system. The received data is tested against certain criteria to determine validity. The received data is also tested to determine whether it was received via a direct path or via a multipath reflection. A validity counter records the percentage of valid data received. A multipath counter records the length of time data is received via direct path relative to the length of time data is received via multipath. Both counters control warning flags to cause a warning to be generated whenever the counter contents are below threshold values. The validity counter is set to an upper limit when its count crosses the threshold in a positive direction and is set to a negative limit when its count crosses the threshold in a negative direction. A constant number is added to the count of the multipath counter whenever its count crosses the threshold in a positive direction and the count is cleared completely whenever the count crosses the threshold in a negative direction.
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"Microwave Landing System, The New International Standard" by H. W. Redlien and R. J. Kelly, published in Advances in Electronics and Electron Physics, vol. 57, pp. 311-410; Academic Press, Inc. 1981.
Devensky Walter L.
Martin Wayne H.
Allied Corporation
Lamb Bruce L.
Rowland James L.
Swarthout Brent A.
Trepp Robert M.
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