دانلود کتاب آنتن‌های آرایه فازی چند پرتوی به عنوان ایستگاه زمینی صورت فلکی ماهواره

Whether you believe it or not, although this is my first time trying to write an academic book, and the topic of this book is about phased array antennas, however, my profes-sional career began with parabolic reflector antennas. When I earned my bachelor’s degree in electronic engineering in 2008, I was fortunately awarded a job that involved the design, construction, and maintenance of the Chinese deep space stations. In the following ten years, our team has developed three globally distributed ground stations with large reflector antennas (66 m in the Jiamusi station and 35 m in the Kashi and Argentina stations), providing continuous telemetry, tracking and command (TT&C), reliable communication, and precise navigation services for all Chinese deep space missions, such as the ambitious Lunar exploration missions Chang’E and the first Chinese Mars exploration mission Tianwen-1. These deep space stations are giant and powerful by integrating with state-of-the-art technologies, including low-loss beam waveguide, centralized high power transmitter, and cryogenic low noise amplifier. I even became the Project Manager and was responsible for all technical matters of the 4×35 m Kashi deep space antenna array.
Along with these projects for deep space missions, I also participated in some other projects for Earth orbit missions. There are many aspects of mission demand differences between them. The deep space missions involve receiving extremely weak signals from vast interplanetary distances, hence its focus requires the ground station with better accuracy and higher sensitivity. However, with the increasing number of satellites in the low earth orbit (LEO), one of the most urgent requirements is multiple mission support capability for the LEO satellite ground station. Recently, the concept of LEO satellite constellation accelerates this problem.
The traditional reflector antennas are powerful but can only produce one beam once at a time. On the contrary, phased array antennas have the natural capability to produce multiple beams simultaneously, thus meeting the requirements for ordinary management and control of future satellite constellation. Compared to the reflector antennas, the architecture of phased array antennas are quite different with thousands of antenna elements, integrated transmit/receive (T/R) modules, decentralized power amplifiers, and agile beamforming networks. Furthermore, phased array antennas have many other advantages over reflector antennas, such as better performance, higher reliability, and lower cost. All of these make it a very attractive candidate as next generation LEO satellite constellation ground station.
There are already a large number of excellent books about phased array antennas available in the open literature, the readers are encouraged to understand the basics of them first (see e.g. [3–5], I also learn and benefit a lot from them!). However, phased array antennas are still new as satellite ground stations. This book is mainly focused on some engineering practices and fills the gap between the well-known phased array theory and satellite ground station application, such as array excitation error impact analysis and calibration methods, array geometry design for hemispherical coverage, multiple beam resource management, etc. Hope you can find something useful. Finally, if you have any comments or questions, please do not hesitate to contact me.