Propeller Modulation Effects on a Scanning-Beam Microwave Landing System
750521
02/01/1975
- Event
- Content
- 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.
- Pages
- 11
- Citation
- Pope, J., and Staehle, W., "Propeller Modulation Effects on a Scanning-Beam Microwave Landing System," SAE Technical Paper 750521, 1975, https://doi.org/10.4271/750521.