GPS单历元定位新算法用于滑坡监测

A NEW APPROACH OF SINGLE EPOCH GPS POSI-TIONING FOR LANDSLIDE MONITORING

在滑坡变形较大时,常规GPS静态观测方式满足不了滑坡实时监测的需要.本文结合滑坡变形的特点,利用GPS单历元定位新方法单历元阻尼LAMBDA方法,对滑坡实时形变进行了监测试验.该方法不需要考虑GPS载波相位测量中棘手的周跳问题,每一历元即可搜索到正确的整周模糊度,从而获得监测点厘米级精度的坐标.采用平滑方法后可以分辨出毫米级精度的坐标和滑动速度,扩大了GPS形变监测的应用范围.本文简要介绍了新方法的原理,并使用低价位的单频GPS接收机,在江西省一个实测滑坡中取得了较好的应用效果.

When the deformation of landslide becomes larger, the conventional static GPS surveying cannot satisfy the real-time requirement in landslide monitoring. In this paper we present a new method for single epoch GPS positioning combining with the accuracy of approximate coordinates of monitored station in landslide monitoring. This algorithm does not consider troublesome cycle-slip problem of carrier phase, and integer ambiguities can be solved at a single epoch, so the centimeter level accurate coordinates can be calculated instantaneously. By means of filtering or smoothing, this method can be extended to detect millimeter level deformation and velocity. In order to test the new method, low-cost single frequency receivers have been used in a real landslide, which happened in Jiangxi Province, China.