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

恒参信道的信道特性不随时间变化或变化很缓慢。由架空明线、电缆、中长 波地波传播、超短波及微波视距传播、人造卫星中继、光导纤维以及光波视距传 播等传输媒质构成的广义信道都属于恒参信道

Fundamental knowledg Quick Overview Kelperian 3 Laws First Law: ellipse, Sun is a focus Second law: the same area in same time Earth

GPS Basic Positioning Principle Two reference systems: Time and Coordinate Syst

3. Reference Systems Book: p 25-38 Dr Guoqing Zhou 1.1 Overview 1.2 A Group of Basic Ce GPS Basic Positioning Principle

Today's Lecture Examine specifics of GPS signals Multiple modulations on same carrier signal Structure of signals GPS receiver operation and satellite acquisition

Perigee and Apogee: The point of closest approach of the satellite with respect to the earth's center of mass is called perigee and the most distant position is the apogee. Nodes: The intersection between the equatorial and the nit sphere is termed the nodes, where the ascending node defines the northward

1. 1 Error Categories 1. Errors related to GPs Satellites 2. Errors related to GPS signal propagation

1.1 Terminology Definitions 3. Point Positioning ys. Relative positioning The coordinates of a single point are determined when 1. Code Range vs, Carrier Phase Code measurements(meter level) Carrier phase measurements(millimeter range). Single point positioning

1.1 Data Handling 1. 2 Cycle Slip Detection and Repair