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

A phase center and array antenna technology, which is applied in antenna radiation patterns, electromagnetic field characteristics, measurement devices, etc., can solve the problems of satellite navigation array antenna phase center limitations, large phase center errors, and limited capabilities

Active Publication Date: 2020-07-07
NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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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
Howeve...

Method used

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

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Embodiment Construction

[0026] refer to figure 1 and figure 2 , the phase center far-field calibration of the satellite navigation array antenna first defines the average reference point position, phase center offset, and phase center stability of the antenna for the array antenna under test, and then builds a far-field test platform based on the microwave anechoic chamber, combined with the original design The five-degree-of-freedom test turntable builds a far-field test environment; adjust the turntable test carrier phase and delay along the array antenna azimuth and pitch two-dimensionally, and convert the test data into azimuth- and pitch-based The phase center offset and phase center stability parameters of the array antenna phase center; combined with the beamforming weighted information and the amplitude-phase consistency correction information, the phase center correction is performed on the weighted beamforming signal of the array antenna, and finally the satellite navigation array antenna ...

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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...

Claims

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Application Information

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IPC IPC(8): G01R29/10G01R29/08
CPCG01R29/105G01R29/0871G01R29/0892
Inventor 段召亮
Owner NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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