It is shown that vehicle as an object of radiolocation is a complex spatially distributed target. The parameters are analyzed and the width of the Doppler spectrum of the signal reflected from the long moving object is determined experimentally. It is shown that the greatest influence on the width of the spectrum of the Doppler signal has a movement acceleration of the object; in this case, the greater is acceleration, the wider is signal spectrum. It is experimentally determined that the width of the spectrum of the Doppler signal is directly proportional to the velocity of the object, its heading angle and angular size and inversely proportional to the wavelength of the bearing fluctuation.
