An Antenna System for LEO Satellite Access with Combination of Wide and Narrow Beams

Abstract

The application relates to a low-orbit satellite access antenna system combining wide and narrow beams, which includes a hemispherical arch-shaped transceiver integrated antenna and a multi-beam phased array transmitting antenna.

Description

technical field [0001] The present application relates to a low-orbit Internet satellite constellation antenna system, in particular to a low-orbit satellite access antenna system combining wide and narrow beams. Background technique [0002] Since 2014, with the rapid development of satellite technology, electronic technology and new material technology, commercial satellite companies in developed countries in Europe and the United States have proposed satellite global Internet plans, planning to launch hundreds or even thousands of low-orbit satellites to build a space-based Internet constellation. Provide user access with global coverage. High-speed user data communication based on microwave links requires the spaceborne antenna to have high gain, and the antenna beam width is inversely proportional to the gain of the antenna. Therefore, access to antennas is a common problem faced by all low-orbit global Internet constellation plans. [0003] At present, the user downl...

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Problems solved by technology

[0010] The mechanical structure of the reflector antenna has a slow tracking speed, and a single antenna can only serve a single user. The total number of users supported by the low-orbit constellation system is too small, and the envelope size of the reflector antenna is relatively large. The number of antennas that can be equipped with a single satellite is limited, resulting in The overall system capacity is limited and service fees are high

[0011] (2) Disturbance caused by antenna rotation

Therefore, the solution of using a fixed horn antenna array will bring the disadvantages of high complexity and long period of construction of the low-orbit constellation system, which is not suitable for commercial aerospace applications

[0016] At present, there are two solutions to this problem in the low-orbit global Internet constellation. One is to increase the number of constellation satellites and propose a communication constellation composed of thousands of satellites to solve the problem of high antenna gain and global coverage; the other is to use spot beams with high The disadvantage of the scheme of gain scanning coverage is that the number of users served by the system at the same time is relatively small

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