The results of a systems study and ground test of the effects of propeller modulation on a time-multiplexed, scanning-beam microwave landing system (MLS) are presented. Propeller modulation effects are analyzed in terms of spacing between receiving antenna and propeller, propeller blade width, and propeller speed. Principal study conclusions: (1) scanning beam MLS is susceptible to errors due to synchronous propeller modulation; (2) the number of synchronous interference multiples increases as the number of propeller blades increases and as the data rate decreases; (3) the probability of synchronous interference decreases at higher data rates; and (4) MLS receiver susceptibility to propeller modulation depends upon the dynamic response of the receiver automatic gain control and the respective tracking loops.


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    Title :

    Propeller modulation effects on a scanning-beam microwave landing system


    Contributors:

    Conference:

    Society of Automotive Engineers, Business Aircraft Meeting ; 1975 ; Wichita, KS


    Publication date :

    1975-04-01


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English





    Propeller Modulation Effects on a Scanning-Beam Microwave Landing System

    Pope, Jack M. / Staehle, William N. | SAE Technical Papers | 1975


    Time Reference Scanning Beam Microwave Landing System

    Department of Transportation, Federal Aviation Administration | TIBKAT | 1978