Receiving Array Antenna Dbf Technology Research

The technology of measuring of the distance, velocity and azimuth of multi-object accurately and quickly in messy environment is one of the key technologies in signal processing of radar, which is based on vehicle. This dissertation is focused on the study of adaptive digital beam forming(DBF), two-dim spectrum estimation and the determination of the highness of the object. Main work include:1 A method of adaptive DBF in received antenna array. The results of the simulations show this method can keep the amplitude of the desired signal, restrain the interference signal, and keep the output power of array to minimum.2 A mathematical model of the reflected signal based on the frequency modulation continuous wave(FMCW) radar, solving the frequency-azimuth estimation of coherent signals by spatial smoothing technology, comparing the resolution of the object based on two-dim MUSIC method and that based on two-dim FFT. The results of simulation show the resolution based on two-dim spectrum method is 2 times high than that based on two-dim FFT.3 A method of determining the highness of an ideal object by beam scanning in the vertical plane and amplitude comparison.4 A block diagram of phased array radar used which is used to measuring the distance, velocity and azimuth of the object in the horizontal plan and the highness in the vertical plane.