Calibration method of outdoor gnss absolute antenna phase center based on carrier triple difference

An antenna phase center and antenna technology, applied in satellite radio beacon positioning systems, radio wave measurement systems, instruments, etc., can solve the problems that the absolute antenna phase center model value cannot be obtained, the correction result is not feasible, and the equipment requirements are high. , to achieve obvious suppression effect, low calibration cost and simple operation
CN107290762BActive Publication Date: 2018-09-07WUHAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
WUHAN UNIV
Publication Date
2018-09-07

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Abstract

The present invention discloses a carrier three-times difference-based outdoor GNSS absolute antenna phase center calibration method. According to the method, firstly, a short baseline is subjected to double-difference resolving during the large-angle and rapid movement of a precision mechanical arm. Secondly, three differential processes among epochs are conducted after the ambiguity is fixed. An extremely short epoch interval can eliminate the antenna phase center errors of a reference station. Moreover, measurement errors caused by the multi-path effect are greatly weakened. Therefore, the antenna absolute phase center compensation PCO and the antenna phase center variation PCV of a GNSS are accurately modeled. According to the invention, based on the outdoor actually-measured data of the GNSS, the phase center errors of a to-be-measured antenna can be separated from relative positioning residual errors. Moreover, the suppression effect on the multi-path effect in the low-height angle observation mode is more obvious. As a result, the PCO calibration and the PCV calibration at the precision of 1mm are realized. The method has an obvious improving effect on the high-precision positioning of GPS / BDS / GLONASS / GALILEO systems.
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Description

technical field

[0001] The invention belongs to the field of antenna measurement technology and satellite navigation and positioning technology, in particular to an outdoor GNSS absolute antenna phase center calibration method based on carrier triple difference. Background technique

[0002] The phase center of the antenna is the electrical center of the signal received by the antenna, and its spatial position is often not on the geometric center of the antenna when it leaves the factory. Generally, the intersection point of the bottom of the antenna and the central axis of the antenna is selected as the reference point (called antenna reference point, English antenna reference point: ARP) to give its electrical center, and this geometric deviation value is called the antenna phase center offset (antenna phase center offset: PCO) . The signal originating from the electrical center is ideally a spherical equiphase surface. However, the actual manufactured antenna is not a s...

Claims

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