A GEO satellite antenna pointing accuracy determining method
A technology of pointing accuracy and determination method, which is applied in the direction of measuring angles, measuring devices, instruments, etc., can solve problems such as the inability to reflect the true pointing accuracy of the antenna on-orbit, and achieve the effect of optimizing the pointing accuracy of the antenna, reducing the manufacturing cost and reducing the difficulty of development.
Inactive Publication Date: 2019-01-01
CHINA ACADEMY OF SPACE TECHNOLOGY
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Problems solved by technology
In actual use in orbit, the antenna pointing accuracy is not only affected by the accuracy of the antenna itself, but also affected by the structural accuracy of the satellite platform and the capabilities of the satellite attitude control system, such as the thermal deformation of the star and antenna caused by changes in the temperature environment, and the control error of the satellite control system. , Satellite attitude sensor measurement error, orbit measurement error, etc. Simple antenna processing accuracy and ground test verification accuracy cannot reflect the true pointing accuracy of the antenna on orbit
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[0033](1) Decompose the antenna pointing accuracy in three directions of the satellite. Firstly, the direction decomposition is carried out on the antenna pointing accuracy which is indexed by the pointing accuracy of the coverage area. The flying direction of the satellite is the +X axis, the direction of the satellite towards the earth is the +Z axis, and the +Y axis is perpendicular to the orbital plane of the satellite and points to the south of the earth. The satellite attitude directions corresponding to the X, Y, and Z axes are the roll direction, the pitch direction, and the yaw direction. The antenna pointing accuracy is decomposed in these three directions, and the total error in the rolling direction is defined as P R , the total error in the pitch direction is defined as P P , the total error in the yaw direction is defined as P Y , comprehensive error Q of rolling direction accuracy R , the comprehensive error Q of the pitch direction accuracy P . The index ...
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A GEO satellite antenna pointing accuracy determining method is provided. The method includes (1) resolving the antenna pointing accuracy in three directions of an antenna; (2) calculating yaw direction precision influence coefficients at the rolling direction and the pitching direction; (3) performing measurement to obtain constant, annual cycle, daily cycle and short cycle characteristic errorsof different positions of the satellite at the rolling, pitching and yawing directions; (4) performing calculation to obtain constant, annual cycle, daily cycle and short cycle characteristic total errors of different positions of the satellite at the rolling, pitching and yawing directions; (5) performing calculation to obtain total accuracy errors of different positions of the satellite at the rolling, pitching and yawing directions; and (6) performing calculation to obtain the composite errors at the pitching and rolling directions of the different positions of the satellite under influences of yaw coefficients.
Description
technical field [0001] The invention relates to a method for determining the pointing accuracy of GEO satellite antennas, which can be popularized and applied in the design process of pointing accuracy of all GEO communication satellite antennas. Background technique [0002] With the mature application of spot beam technology and frequency and polarization multiplexing technology, high-orbit communication satellites are developing rapidly in the direction of high-throughput. While the satellite transmission capacity performance is greatly improved, the coverage area of a single beam is reduced and the coverage of different beams is reduced. The overlap of coverage areas also puts forward higher requirements on the pointing accuracy index of the antenna. [0003] The accuracy design of existing antennas generally starts from two aspects: antenna processing accuracy control and ground test verification. The effect of improving the overall precision is achieved by improving...
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IPC IPC(8): G01C1/00
CPCG01C1/00
Inventor 夏永泉孟庆达刘波吴汉琨杨柳莹王禹慧魏晓楠
Owner CHINA ACADEMY OF SPACE TECHNOLOGY