Multi-target micrometric displacement measuring method based on antenna array

The invention discloses a large building multi-target micrometric displacement measuring method and belongs to the technical field of building deforming monitoring. P passive corner reflectors are arranged on a tested object, and an array radar is arranged far away from the tested object. The antenna array radiates signals to irradiate all the corner reflectors and receives mixed echo signals, P optimal wave beams are formed, the echo signal of each corner reflector is separated, each wave beam has the maximum gain in the echo signal direction of a corner reflector which needs to be separated, and received signal power is the strongest in that direction; and nulling is formed in the corner reflector echo signal direction of the other P-1 corner reflectors, and interference is lowered to the minimum degree. The phase difference of sending signals and recovered corner reflector echo signals is detected, and phase different changing amount is converted into micrometric displacement amount of each corner reflector. The problem that a plurality of corner reflector echo signals are hard to separate is solved, multi-target micrometric displacement measuring is achieved, anti-jamming capability is high, and the method can be well used in building micrometric displacement measuring.