Analysis of the theoretical radar return signal form aircraft propeller blades

The theoretical return signal from aircraft propeller blades is analyzed. The basic theory involved is described, some simulation results are examined, and some practical considerations are discussed. It is shown that the modulation contained in the return signal is a form of frequency modulation and results in a number of sidebands about the center frequency of the target. It has also been shown that the modulation is due to six main variables, four of which are parameters of the propeller blades, one of which depends on the radar, and one of which depends on the aspect angle of the propeller