圆弧式地基合成孔径雷达在高陡边坡形变监测中的应用

Application of Arc GB-SAR in Deformation Monitoring of High and Steep Slopes

我国西南山区昼夜温差大、大气环境复杂多变,基于圆弧合成孔径及差分干涉测量技术,研发一款便携式圆弧地基合成孔径雷达,在川西某铁路高陡边坡开展应用研究,将国产圆弧式地基合成孔径雷达与意大利IBIS-L地基合成孔径雷达进行大气扰动校正能力、形变测量精度等参数的同步对比测试,并对该高陡边坡进行长时间不间断实时变形监测。结果表明,国产圆弧式地基合成孔径雷达具备自适应大气扰动校正能力,在西南山区铁路沿线高陡边坡复杂多变气候条件下,大气扰动校正能力、形变测量精度均优于IBIS-L地基合成孔径雷达,其中,国产地基雷达24 h稳定点形变值均在±1 mm以内,IBIS-L地基雷达均超出±1 mm,国产地基雷达在1 km监测距离处的径向形变误差RMS为0.079 mm,IBIS-L地基雷达为0.159 mm,表明国产圆弧式地基合成孔径雷达具有高精度、高可靠性、快速机动部署等优势。

The temperature difference along the southwestern mountainous is large,and the atmospheric environment is complex and variable.Based on the arc synthetic aperture and differential interferometry measurement technology,a portable Arc GB-SAR was developed and applied to a high and steep slope along a railway in western Sichuan.The domestic Arc GB-SAR and Italian IDS company IBIS-L GB-SAR were synchronously compared and tested for atmospheric disturbance correction ability,deformation measurement accuracy,and long-term uninterrupted real-time deformation monitoring was carried out on the high and steep slope.The results show that the domestic Arc GB-SAR has adaptive atmospheric disturbance correction capability.Under complex and variable climate conditions along the high and steep slopes of the southwestern mountainous railway,the atmospheric disturbance correction capability and deformation measurement accuracy are better than those of the IBIS-L GB-SAR.The stable point deformation values of domestic Arc GB-SAR are all within±1 mm within 24 hours,while the IBIS-L GB-SAR exceeds±1 mm.The RMS value of radial deformation error for domestic Arc GB-SAR at a monitoring distance of 1 km is 0.079 mm,while for IBIS-L GB-SAR it is 0.159 mm.This verifies that the domestic Arc GB-SAR has the advantages of high accuracy,high reliability,and rapid deployment.