1.1大地测量学的定义、分类和任务 定义:大地测量学是为人类活动提供空间信息的科 学,着重研究地球的几何特征(形状和大小)和 基本物理特性(重力场)及其变化。 分类:几何大地测量、物理大地测量 几何大地测量:经典大地测量、空间大地测量 物理大地测量:地面重力、航空重力、卫星重力

Ground system design Col John Keesee 6/17/2004 Lesson objective The student will Be able to list the functions performed by a space systems ground support system 2. Know factors in ground station design 3. Know components of ground station

Satellite communications Architecture Identify Requirements Specify architectures Determine link data rates Design Size each link Document your rationale

Overview Spacecraft data processing requires microcomputers and interfaces that are functionally similar to desktop systems However, space systems require: - Low power, volume, and mass High reliability and fault tolerance

Background OF TECHN Why is Software Engineering Hard? “Curse of flexibility \And they looked upon the software and saw that it was good. But they just had to add one other feature ... No physical constraints

Optimization of Separated Spacecraft Interferometer Trajectories in the Absence of A Gravity-Well Edmund M Kong Prof david w, miller MIT Space Systems Laboratory 20th March 1998 Space Systems Laboratory Massachusetts Institute of Technology

Space System Software Spacecraft computer systems and their software provide unprecedented capability on orbit, but drive system cost and complexity

20.1 Geodesics .... 20.1.1 Motivation 20.1.2 Definition ..:. 20.1.3 Governing equations 20.1.4 Two-point boundary value problem 20.1.5 Example 20.2 Developable surface

23 F.E. and B.E. Meshing Algorithms 23.1 General 23.1.1 Finite Element Method(FEM) 23.1.2Mesh 23. 1.3 Some Criteria for a Good Meshin 23. 1.4 Finite Element Analysis in a CAD Environment

Cambridge MA 02139-4307 USA Copyright 2003 Massachusetts Institute of Technology Contents 8 Fitting, Fairing and Generalized Cylinders 8. 1 Least Squares Method of Curve Fitting 8.2 Fairing of Curves and Surfaces 8.2.1 Properties and Definition