Astronautics Space Flight

Download Spacecraft Power Systems by Mukund R. Patel PDF

By Mukund R. Patel

The facility platforms of area cars have gone through major improvement in the course of the earlier decade, and may proceed to take action within the speedy destiny. earlier, with the exception of the scattered result of meetings and some courses with sketchy assurance, no unmarried quantity has lined the complete spectrum of the topic. Spacecraft energy platforms addresses each part of electric energy procedure layout, analyses, and operation with a degree of element came across nowhere else. The booklet can provide huge insurance of the basics of power conversion, strength garage, strength conditioning, power administration, and operational elements that aid engineers preserve a number one part within the layout of varied platforms. This quantity presents the latest info and strategies for designing an electric strength approach that meets undertaking specifications at not less than expense and weight.This e-book developed from classes taught by means of the writer and from the author's deep involvement in lots of layout and improvement courses on the common electrical area department and at Lockheed Martin house structures.

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GEO: geosynchronous Earth orbit, circular at 35,786-km altitude MEO: mid Earth orbit, circular at 2000 to 20,000-km altitude LEO: low Earth orbit, generally circular at 200 to 2000-km altitude HEO: highly elliptical orbit, such as Molniya A communications satellite provides interconnectivity over a large area for point-to-point, point-to-multi-point, and broadcast communications. It can serve fixed as well as mobile terminals anywhere — on land, on the sea, in air or in space. A typical satellite transponder receives an uplink signal from a ground station, frequency converts, amplifies and retransmits it to the ground.

2 Satellite Systems The typical communications satellite bus consists of the following systems. 1 Communications and Data Handling The communications and data handling system performs three independent functions: It receives and demodulates information transmitted to the satellite from the ground station via command links. It transmits data, both recorded (remote) and real-time, from the satellite to the ground station via data links. It transmits bus equipment and other telemetry data from the satellite to the ground station via telemetry links.

Satellites with complex missions also require systems to determine the spacecraft attitude and orbit orientation, and propulsion to control both. Satellite design is generally optimized to the fullest extent such that any change would result in a higher cost. The total mission cost, however, is a complex function of many variables, and so is the power system cost. The cost, C, in dollars per watt of power generated can be expressed as a function of four major variables as follows: C ¼ fðX1 ; X2 ; X3 ; X4 Þ ð1:1Þ where X1 ¼ cost per kg of the power system mass launched, X2 ¼ cost per liter of the power system volume launched, X3 ¼ cost per watt of the power system generation capacity, and X4 ¼ cost of altitude control related with power system components.

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