Multi-target micrometric displacement measuring method based on antenna array

Abstract

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.

Description

technical field [0001] The invention belongs to the technical field of building deformation monitoring, and relates to a multi-target micro-displacement measurement method based on an antenna array. Background technique [0002] In nature, under the action of various influencing factors, the shape, size and position of buildings will change in time domain space, such as the swing of high-rise buildings and the deformation of dams. When the amount of deformation exceeds the allowable range that the deformable body can bear, it will bring serious disasters to human production and life, so it is of great significance to monitor the deformation of objects. [0003] Patent CN1542407A proposes a micro-displacement measurement method. In this method, a passive corner reflector is placed at the monitored point, and a microwave phase comparison measurement device is placed at the monitoring point. The transmitting part of the microwave phase comparison measurement device emits a For...

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Problems solved by technology

However, the biggest problem of this method in actual use is: it is a single-frequency continuous wave radar, which has poor anti-interference ability, and can only measure the micro-displacement of a single microwave transmitter, and cannot realize multi-target measurement; In the displacement detection work, it is generally necessary to set up multiple monitored points. Therefore, the above method is subject to many limitations in the actual displacement monitoring process.

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