As the GPS method is different from deformation measuring methods with extensometer and horizontal pendulum tiltmeter at the aspect of having source, point observation, data composition, data deleting, data preprocessing, comparing datum,the sole basic data and so on.
由于GPS观测方法在有源性、点观测、数据成分、数据剔除、数据预处理、比较基准、基础数据的惟一性等方面,与伸缩仪、水平摆倾斜仪等形变观测方法存在相当大的差异,为了了解GPS测量的特性,选择固体潮为观测对象,比较了GPS与伸缩仪等形变观测仪的异同。