Environment correction methods of static micro-deformation surveyed by Ground-based radar

To ensure the accuracy, the environment's impact of ground-based radar in static micro-deformation monitoring should be corrected effectively. A series of simulated deformation were produced by a specially designed corner reflector. The deformation values were measured by Ground-based radar and slide caliper rule synchronously. In stable environment, the accuracy of Ground-based radar static measurement is better than 0.1 mm, which was analyzed through comparative test. Wild field monitoring tests showed that the environment's impact on the measurement can reach 0.5 mm, just within hours' static observation, with radial distance 60 m, which must be carefully corrected. Two effective methods for environmental correction were verified. The correction can be obtained by substituting atmospheric parameters into microwave's atmospheric propagation correction formula. The environmental correction of deformable object also can be translated by observing the environment's impact of steady target in vision. Results confirm that both of these methods are effective for the correction of environment's impact. After corrected, the accuracy of deformation values measured can be about 0.15mm. Then the advantages and disadvantages, influencing factors of these two methods were analyzed.