Satellite Communications GBV（卫星通信GBV）.PDFVIP

Satellite Communications Second Edition Timothy Pratt Charles W. Bostian Department of Electrical Computer Engineering Virginia Polytechnic Institute and State University Jeremy E. Allnutt Department of Electrical Computer Engineering George Mason University John Wiley Sons CONTENTS Preface ix 1. Introduction 1 1.1 Background 1 1.2 A Brief History of Satellite Communications 3 1.3 Satellite Communications in 2000 6 1.4 Overview of Satellite Communications 15 1.5 Summary 16 References 16 2. Orbital Mechanics and Launchers 17 2.1 Orbital Mechanics 17 Developing the Equations of the Orbit 17 Keplers Three Laws of Planetary Motion 22 Describing the Orbit of a Satellite 23 Locating the Satellite in the Orbit 25 Locating the Satellite with Respect to the Earth 27 Orbital Elements 29 Example 2.1. 1 Geostationary Satellite Orbit Radius 29 Example 2.1.2 Low Earth Orbit 29 Example 2.1.3 Elliptical Orbit 30 2.2 Look Angle Determination 30 The Subsatellite Point 3 1 Elevation Angle Calculation 32 Azimuth Angle Calculation 34 Specialization to Geostationary Satellites 35 Visibility Test 36 Example 2.2. 1 Geostationary Satellite Look Angles 36 2.3 Orbital Perturbations 38 Longitudinal Changes : Effects of the Earths Oblateness 39 Inclination Changes : Effects of the Sun and the Moon 40