Bridge deformation close range monitoring method based on foundation InSAR

The invention discloses a bridge deformation close range monitoring method based on a foundation InSAR, belonging to the engineering measurement field. The method comprises: obtaining two pairs of SAR images before and after bridge deformation through an InSAR, performing coherence processing on the SAR images to obtain two phase coherence images before and after bridge deformation; and performing difference processing on the two SAR images, finally obtaining a differential phase, i.e., a deformation phase, and obtaining bridge deformation according to the deformation phase. The InSAR measurement technology is all-weather and full-time, and possesses the characteristics of high resolution and continuous space coverage; accordingly, the method overcomes the disadvantages of single-point measurement, low resolution and susceptibility to extraneous interference, and can perform real-time and long-term monitoring on a bridge, and provide basis and guidance for bridge maintenance and management decision.