Stable phase center measurement antenna

Abstract

The invention discloses a stable phase center measurement antenna which is mainly used in the fields of geodesy and relevant subjects including marine geodesy, geophysical exploration, resource exploration, engineering surveying, engineering deformation, spacecraft docking and the like. The antenna comprises a metal base of the antenna and wave-absorbing material arranged on the upper surface of the outer edge of the metal base. The center part of the metal base is a round cavity, and a circuit board protection cover, a multi-feed slot antenna array, a supporting medium, annular wave-absorbing material in the cavity, a coaxial feed antenna and a radio frequency connector are installed in the cavity from top to bottom. Two round groove choking coils are contained between the round cavity and the outer edge of the base. The multi-feed point, wave-absorbing material and coking coil technologies are comprehensively adopted for the stable phase center measurement antenna, and thus the stable phase center measurement antenna has the advantages of being low in wide angle polarization axis ratio and high in phase center stability and can be used for various kinds of precision measurement for satellite navigation.

Description

Technical field: [0001] The invention relates to a high-stable phase center antenna suitable for high-precision directional positioning required by satellite navigation precision measurement technology or space vehicle docking technology. It has small standing wave ratio, small axial ratio, and high phase center stability in a wide beam range. Significant advantages. Background technique: [0002] At present, the satellite navigation systems in operation around the world include the GPS system of the United States, the GLONASS system of Russia, the Galileo system of Europe and the Beidou second-generation satellite navigation and positioning system of China. Positioning and measurement are the two major functions of the satellite navigation system. The pseudo-range is determined by the pseudo-code phase as the observation for positioning, and the pseudo-range is mainly determined by the carrier phase observation for measurement. Satellite navigation precision measurement te...

AI Technical Summary

Problems solved by technology

Due to the use of series feed, although the phases between multiple slots can be guaranteed to decrease sequentially, the feed amplitude cannot be adjusted and decreases. The inconsistency of the feed amplitude forms a contradiction with the antenna efficiency, which is finally reflected in the stability of the antenna phase center and the stability of the antenna. Paradox of efficiency

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