The ellipsoid model is the first part of a spatial referencesystem definition.
椭圆体模型是空间引用系统定义的第一部分。
2
Firstly, a series of reference systems, related to GPS navigation positioning system, such as timing system, reference frame and force modelsystem, are discussed in detail.
本文详细地论述了与GPS导航定位系统一系列有关的参考系统:时间系统、坐标系统和力模型系统。
3
And a design method of modelreference adaptive control for system with pure lag is presented.