| Antenna systems are used to receive and transmit RF microwave, which are typical electronic-machining products. Antenna system is an important part of radar, telecommunication, navigation and electrical countermeasure, etc. An antenna system mainly contains reflector, pedestal and driving mechanism. The operation range of normal radar and satellite earth station antenna only require a certain fan-shaped sector. The time for down-link tracking is required as long as possible, the distance to earth station is required to be nearest, while the signal is needed to be strongest in this sector when the flight vehicle is passing the zenith. Therefore, there are more requirements to the earth station antenna for special capability such as passing zenith tracking. The designed light tracking pedestal that supports dual reflector antenna system is introduced in the thesis. The system can make antenna beam cover the whole space, track a lower orbit, track visible satellite targets in any inclination orbit and ensure tracking continually satellite signal in whole downlink process efficiently.The operation principle of structure system of light passing zenith tracking antenna, structural proposal of light antenna system and analysis and calculation of specification are described explicitly in the paper. The analysis and calculation of of main specification includes main-reflector accuracy, wind load, inertial load and axial system accuracy. The structural mechanics of light weight antenna reflector and pedestal is analyzed and calculated by FEA method. The model of FEA and result of analysis is given in the paper.Computer optimization and mechanics analysis provide an important design basis for development of structure system of light passing zenith tracking antenna. In-situ electrical measurement on antenna system has been carried out. It is found that this antenna system has good axial system accuracy, excellent transmission precision and structural rigidity, which is compatible with TT & C station as well and can be widely used in remote-sensing earth station. It is unnecessary to use large-scale transportation and hoisting apparatus because of its significant advantage of light weight. It is convenient to establish station in nasty day in an outlying district and two poles of the earth establishment far away from our native country.The design of structure system of light passing zenith tracking antenna and relative technical points are summarized and evaluated in the paper from the view of technology. The application of structure system of light passing zenith tracking antenna proves the technical specification can fully meet the practical requirements of system integration. |
