发明授权
- 专利标题: Method for enhancing the performance of a satellite communications system using multibeam antennas
- 专利标题(中): 使用多波束天线提高卫星通信系统性能的方法
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申请号: US183273申请日: 1998-10-30
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公开(公告)号: US6150977A公开(公告)日: 2000-11-21
- 发明人: Donald C. Wilcoxson , Eldad Perahia
- 申请人: Donald C. Wilcoxson , Eldad Perahia
- 申请人地址: CA Redondo Beach
- 专利权人: TRW Inc.
- 当前专利权人: TRW Inc.
- 当前专利权人地址: CA Redondo Beach
- 主分类号: H04B7/204
- IPC分类号: H04B7/204 ; H04B7/185 ; H01Q3/00
摘要:
The present invention provides a method for determining antenna pointing error of a satellite antenna (702-716) that produces at least one spot beam having a corresponding gain pattern. The method obtains from a first unique location (510) on the ground a first measurement of a spot beam strength for a first cell (502). Similar measurements are obtained at second and third unique locations (512, 514). Attitude component errors, for example the roll or pitch attitude component errors may then be determined. The method may further determine a yaw attitude component error based on fourth, fifth, and sixth measurements of spot beam strength made from unique locations (616-620) in a second cell (604) also generated by the antenna. Additional measurements may be collected in each beam at unique locations (510-514, 516-520, 610-614, 616-620) and averaged to reduce the temporary or zero means effects of rain, scintillation, or other atmospheric conditions on the spot beam strength. Furthermore, the method may transmit any of the measurements to a central processor (422) which determines the attitude component errors based on the measurements.