Radar System Imaging in Conditions of Periodic Shading
The choice of airborne radar system location on helicopter board is quite important in context of rapid development of onboard navigation systems. Recently, the option of radar location above the rotating helicopter propeller has become very popular. Such location has many advantages, but also entails the emergence of new problems. One of such problems is the radar signal distortion due to the rotating propeller blades in the propagation path of probing signal. The problem of compensating for the negative effect of rotating blades on the signals arriving at the receiving onboard radar antenna is solved in the article. The effect of the blades causes the disappearance of signal fragments, which makes it difficult to accurately reconstruct the original reflected signal. Different ways of solving problem are considered, such as signal recovery using interpolation polynomials, fitting functions, linear prediction and other methods. Various interpolation methods are considered. Using the example of restoring the simulated reflection signal of the underlying surface with point reflectors on it, a comparison of different interpolation methods is carried out. The recovery accuracy and computational costs of the developed algorithm are considered as evaluation criteria. Based on the above criteria, a comparative table of compensation methods for the negative impact of helicopter blades is formed.
Radar systems, small mobile radars, synthetic aperture radar (SAR), interpolation, cubic spline