Radar for Aircraft Motion Vector Components Measurement

An algorithm for optimal signal processing in the radar, measuring three components of the full helicopter flight speed vector, has been synthesized. Several partial problems have been solved for this. In particular, the equation of the distance between the radar antenna and the underlying surface has been found, considering that the helicopter can occupy any position in space relative to the underlying surface. In the solved problem, the antenna radiation pattern is rigidly fixed relative to the helicopter building axis. Unlike the traditional approach, which consists of measuring the components of the velocity vector along the 0x and 0y coordinates by the Doppler frequency shift, the range “migration” information parameter within the irradiated section of the underlying surface is used. As a probing signal, the feasibility of using a signal with linear frequency modulation is substantiated. In contrast to the conventional approach to synthesizing speed determination problems, it is proposed to present the received signal as a superposition of signals reflected by the area irradiated by the antenna's directional pattern. It is shown that it is enough to form three independent beams that are correspond to three independent channels of measuring the law of the range change to solve the problem. Based on the synthesized signal processing algorithm, a structural diagram of the radar has been developed. The results of radar modeling confirm the effectiveness of the results presented in the report.