Objectives In the research of time-series interferometric synthetic aperture radar (TS-InSAR) deformation monitoring, the conventional triangular reflectors are increasingly used as point targets. But the conventional triangular reflectors cannot meet the requirements of obtaining multi-angle deformation information on ascending and descending track scenes. They need to be tailored for specific datasets to meet monitoring needs.
Methods A set schemes for corner reflector design and accuracy verification are constructed.According to the characteristics of X-band radar satellite satellite, a two-way adjustable rectangular corner reflector is designed to meet the monitoring scene of the ascending and descending track. Due to the relationship between the radar cross section(RCS) and the size of the corner reflector, the side length of the bidirectional rectangular corner reflector is calculated to be 0.35 m.Ten bidirectional rectangular corner reflectors are placed on the side slope of the highway in the monitoring area.By artificially simulating the two-dimensional deformation, the detection accuracy and reliability of the TS-InSAR on the bidirectional rectangular corner reflector is verified.
Results Under the condition of effectively eliminating the sidelobe effect of the pixel, the designed bidirectional rectangular corner reflector maintains a high and stable backscattering intensity, which can be easily extracted. Through the analysis of the weather conditions at the time of imaging, heavy rainfall has a certain influence on the backscattering intensity of corner reflectors. Under the blind experimental conditions of artificially adjusting the height of the corner reflector, CR1 and CR2 are moved between May 13, 2018 and May 24, 2018. The root mean square error is 0.6 mm. The deformation detection accuracy reaches the sub-millimeter level.
Conclusions The TS-InSAR is highly sensitive to the deformation of the designed bidirectional rectangular corner reflector. The bidirectional rectangular corner