Antenna for signal quality evaluation and receiving channel calibration system and method
A signal quality evaluation and receiving channel technology, applied in radio wave measurement system, satellite radio beacon positioning system, measurement device, etc., can solve the problems of poor accuracy of time delay data, low stability of reference time baseline, etc., and achieve quality Evaluate the effects of high precision, good market application value, and high stability
Active Publication Date: 2020-11-13
NAT TIME SERVICE CENT CHINESE ACAD OF SCI
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Problems solved by technology
The advantage of this method is that the concept is clear, the method is concise, and it can theoretically achieve infinite precision delay measurement. The disadvantage is that the stability of the reference time baseline is not high.
Moreover, the greater the channel delay, the worse the accuracy of the measured delay data
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[0037] In order to enable those skilled in the art to better understand that the technical solutions of the present invention can be implemented, the present invention will be further described below in conjunction with specific examples, but the given examples are only used as illustrations of the present invention, not as limitations of the present invention.
[0038] Such as Figure 1-2 The shown antenna and receiving channel calibration system and method for signal quality evaluation include antenna calibration and receiving channel calibration, and the antenna calibration adopts an antenna online precision calibration mechanism 1 .
[0039] 1. Antenna Calibration
[0040] Large-aperture antennas play a pivotal role in the fine monitoring and evaluation system of GNSS signal quality. At the same time, it is the only outdoor large-scale equipment. Practice has shown that its performance changes are greatly affected by the external environment and its own deformation.
[0...
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The invention relates to an antenna for signal quality evaluation and a receiving channel calibration system and method. The method comprises antenna calibration and receiving channel calibration. Anantenna on-line precision calibration mechanism is adopted for antenna calibration, and the antenna on-line precision calibration mechanism comprises two laser range finders which are respectively arranged at one end of a main reflecting surface in the antenna pitching motion direction and the top end of an antenna feed source and are used for measuring deformation data of the main reflecting surface and an auxiliary reflecting surface in the antenna motion process. The receiving channel calibration comprises measurement calibration of amplitude-frequency correspondence, gain, group delay andphase-frequency characteristics and absolute time delay measurement calibration; a vector network analyzer is adopted for measurement calibration of amplitude-frequency correspondence, gain, group delay and phase-frequency characteristics, and is used as a measuring instrument for monitoring the amplitude, phase and delay of a signal radio frequency channel; and the absolute time delay measurementcalibration adopts a mode of combining a vector signal generator and an oscilloscope to carry out receiving channel absolute time delay precision measurement. The method has the advantages of high precision, high stability and small influence of external environment.
Description
technical field [0001] The invention belongs to the technical field of antenna signal calibration, in particular to an antenna and receiving channel calibration system and method for signal quality evaluation. Background technique [0002] Large-aperture antennas play a pivotal role in the fine monitoring and evaluation system of GNSS signal quality. At the same time, it is the only outdoor large-scale equipment. Practice has shown that its performance changes are greatly affected by the external environment and its own deformation. [0003] Affected by the external temperature, metal structural parts such as the antenna feed source, reflector, and back frame will inevitably produce thermal expansion and contraction effects, resulting in slight changes in their own length and volume, as well as the positional relationship (displacement) between them; affected by antenna movement ( Influenced by gravity and inertial force during the process of wind load or wind load, the mai...
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IPC IPC(8): G01S19/23
CPCG01S19/23G01S19/235
Inventor 饶永南卢晓春王雪石慧慧张馥臣贺成艳
Owner NAT TIME SERVICE CENT CHINESE ACAD OF SCI