Phase center far-field calibration method of satellite navigation array antenna

Abstract

The invention discloses a phase center far-field calibration method of a satellite navigation array antenna. The invention provides an engineering implementation scheme for defining, testing and correcting the phase center of the array antenna. Meanwhile, the far-field accurate calibration of the electric phase center of the array antenna based on the real satellite navigation signal is realized through an original five-degree-of-freedom test turntable based on a microwave darkroom. Finally, the phase center offset and the phase center stability of the array antenna are obtained according to the calibration result of the electric phase center in the form of least square algorithm fitting, and the two parameters are used as parameter input of array antenna beam forming for correction, so that calibration of the phase center of the satellite navigation array antenna is realized. The method is simple and feasible, and has popularization and application values in the field of satellite navigation high-precision measurement in a complex electromagnetic environment.

Description

technical field [0001] The invention relates to the fields of communication, satellite navigation, signal processing, antenna testing and the like, and is particularly suitable for the application of high-precision measurement of array antennas in the field of high-precision measurement of satellite navigation under complex electromagnetic environments. Background technique [0002] With the development of global satellite navigation system, high-precision measurement has become a main direction of satellite navigation system application. Applications such as high-precision RTK positioning and carrier determination and attitude measurement all put forward higher requirements for the antenna phase center of satellite navigation, and the accuracy of the phase center is not greater than 2 mm. At present, the antenna with high-precision phase center is mostly implemented in the form of a single antenna with a choke coil. However, in practical environment applications, facing th...

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Problems solved by technology

However, in the actual environment application, facing the complex electromagnetic environment of radio frequency interference and multipath interference, the single antenna using a choke coil has limited ability to suppress interference and multipath, and the anti-interference and anti-multipath of satellite navigation array antennas have become the mainstream application mode

However, there are phase center limitations in the application of satellite navigation array antennas to high-precision measurements:

[0004] 2. The phase center calibration of the satellite navigation array antenna is mostly realized by the method of near-field channel measurement and simulation evaluation, which has a large error with the phase center application in real engineering applications

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