Rapid evaluation method for large phased-array antenna wave beam performance

The invention discloses a rapid evaluation method for a large phased-array antenna wave beam performance. With the method, a waveform performance of a large array antenna cab be evaluated rapidly and accurately. A small area array antenna with identical antenna unit arrangement mode, antenna unit distance, antenna unit structural mode with those of a large planar phased-array antenna is manufactured; whether the antenna unit of the large phased-array antenna is designed to be reasonable is checked based on the waveform performance of the small area array antenna and that is, whether a scanning blind point occurs is checked; the amplitude and phase of the center unit of the small area array antenna are used as the amplitude and phase of each antenna unit in the area array of the large planar phased-array antenna and a synthesis power P is calculated; and the waveform characteristic of the large planar phased-array antenna is evaluated by using the synthesis power P.