Worldwide growth of space communications has caused a rapid increase in the number of satellites operating in geostationary orbits, causing overcrowded orbits. This practical resource is designed to help professionals overcome this problem. This timely book provides a solid understanding of the use of radio interferometers for tracking and monitoring satellites in overcrowded environments. Practitioners learn the fundamentals of radio interferometer hardware, including antennas, receiving equipment, signal processing and phase detection, and measurement accuracies. This in-depth volume describes the nature of the targets to be tracked by the interferometer, helping to clarify the movement of target satellites and what specific information has to be caught by the interferometer. Additionally, engineers find details on applications to practical cases of satellite tracking, covering different types of interferometers, recent technical developments, orbital monitoring and safety control.
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Radio Interferometry and Satellite Tracking based on 0 ratings. 1 reviews.
Are you a space communications professional who is concerned about overcrowded satellite orbits? If you are, then this book is for you. Author Seiichiro Kawase, has done an outstanding job of writing a book that shows you how radio interferometers can be used for tracking and monitoring the orbits of geostationary satellites in the overcrowded environment. Author Kawase, begins with a brief overview of the radio interferometer, or simply interferometer, which provides a means of measuring the directional angle of downlink microwaves from a target satellite. Next, the author looks at antenna polarization and mechanical rigidity. He continues by discussing how to maintain phase accuracy when receiving the satellite signals. Then, the author discusses how to measure the interferometric phase for a satellite beacon and for a reference correction signal. He then examines the parameters determining the signal and noise for the practical cases of satellite downlinks. Next, the author addresses measurement errors that originate from baseline errors, phase ambiguity and atmospheric refractions. Then, he addresses the baseline design problem and suggests a possible solution. The author then continues with a discussion of the orbits of geostationary satellites. Next, he discusses Kepler’s laws one by one, with their physical meaning clarified, where the original reference of the laws to planets and the sun has been changed to satellites and the Earth. The author continues by looking at the motion of near-stationary satellites on the basis of Kepler’s laws. Then, he looks at the context of near-stationary orbits, how an orbit can be changed to a desired orbit through such a maneuver. The author then discusses various types of extra forces that are not generated by the satellite itself, but originate from various sources existing in the space environment. Next, he discusses the station-keeping method, making use of the formulations of orbital maneuvers and perturbations. The author continues by reviewing the current regulations for the placement of satellites in orbit, mainly from the viewpoint of orbital safety. Then, he discusses how interferometers can be used for satellite tracking and orbit estimation and actual application cases. The author then describes the concept and principle of orbit estimation. Next, he shows you how to develop the prototype interferometer into a realistic form. The author continues by demonstrating the case of an interferometer that has been designed specifically for tracking satellite longitudes, and examines its use for precise longitude keeping. Then, he illustrates the case of a combined system interferometry and ranging capabilities. The author then covers the case of an interferometer that has been designed specifically for differential tracking. He continues by discussing a specifically designed interferometer that has a mechanically movable baseline. Finally, the author discusses a different kind of interferometer, one that has a inverted geometery—the antennas are high up in the orbit and they point toward the Earth. This most excellent book demonstrates that you can overcome the difficulties to make the interferometer truly capable of precise satellite tracking. More importantly, this book covers the location of an Earth station on the map by using a special tracking method, which is based on the same principle as the satellite tracking interferometer.