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广泛修订了这本卫星通信方面的畅销书，包括有关立方体卫星、NGSO卫星系统和卫星上网的新章节。

Extensive revision of the best-selling text on satellite communications ― includes new chapters on cubesats, NGSO satellite systems, and Internet access by satellite.

自《卫星通信》第一版出版以来的三十三年里发生了许多变化。

There have been many changes in the thirty three years since the first edition of Satellite Communications was published.

随着模拟技术被数字调制和数字信号处理所取代，通信系统已经从模拟系统完全过渡到数字系统。

There has been a complete transition from analog to digital communication systems, withanalog techniques replaced by digital modulation and digital signal processing.

虽然电视节目的分发仍然是商业卫星通信的最大部门，但用于互联网接入的低地球轨道卫星星座将挑战这一主导地位。

While distribution of television programming remains the largest sector of commercial satellite communications, low earth orbit constellations of satellites for Internet access are set to challenge that dominance.

在第三版中，第一章到第三章涵盖了特定于卫星的主题，包括轨道、发射器和航天器。

In the third edition, chapters one through three cover topics that are specific to satellites, including orbits, launchers, and spacecraft.

第四章到第七章涵盖了数字通信系统的原理、无线电频率通信、数字调制和多址技术以及在地球大气层中的传播，这些都是所有无线电通信系统的共同主题。

Chapters four through seven cover the principles of digital communication systems, radio frequency communications, digital modulation and multiple access techniques, and propagation in the earth’s atmosphere, topics that are common to all radio communication systems.

第八章至第十二章涵盖的应用包括非地球静止卫星系统、低吞吐量系统、卫星直播电视、卫星互联网接入和全球导航卫星系统。

Chapters eight through twelve cover applications that include non-geostationary satellite systems, low throughput systems, direct broadcast satellite television, Internet access by satellite, and global navigation satellite systems.

关于卫星上网的一章是第三版的新内容，每一章都作了广泛的修订，以包括自2003年第二版出版以来该领域的许多变化。

The chapter on Internet access by satellite is new to the third edition, and each of the chapters has been extensively revised to include the many changes in the field since the publication of the second edition in 2003.

增加了两个附录，包括模拟信号的数字传输和天线。这本书对学生和专业人士来说都是非常宝贵的资源：

•侧重于卫星通信的基本理论

•解释理解卫星通信物理和工程所需的基本原理和基本数学知识

•讨论卫星通信系统在直播卫星电视、全球定位系统和互联网接入等领域的扩展

•介绍小型卫星的快速发展领域

•提供基于真实世界卫星系统的相关实践问题

Two appendices have been added that cover digital transmission of analog signals, and antennas. An invaluable resource for students and professionals alike, this book:

• Focuses on the fundamental theory of satellite communications

• Explains the underlying principles and essential mathematics required to understand the physics and engineering of satellite communications

• Discusses the expansion of satellite communication systems in areas such as direct-broadcast satellite TV, GPS, and internet access

• Introduces the rapidly advancing field of small satellites, referred to as SmallSats or CubeSats

• Provides relevant practice problems based on real-world satellite systems

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