On-site calibration device for phased array antenna

Abstract

The invention belongs to the field of microwave near field measurement and specifically relates to an on-site calibration device for a phased array antenna. The on-site calibration device comprises an optical probe array and a signal processing system, wherein the optical probe array is erected on a phased array antenna array face via a fixed machine rack, each optical probe in the array corresponds to an antenna unit and is used for precisely controlling distance and consistency between each optical probe and the antenna unit, the optical probe array is connected with the signal processing system via polarization maintaining optical fibers, and excitation of the antenna array face is provided by a excitation signal source in the signal processing system via a straight-through end of a directional coupler. The optical probe array does not contain any metal device, no near field radiation field of a radar antenna can be affected, measurement realness can be ensured, probes are positioned very near to the antenna units, the device cannot be affected by multipath effects produced by electromagnetic fields reflected by the ground or objects or the like and interference such as coupling effects and the like between antenna units, and measurement accuracy can be ensured.

Description

technical field [0001] The invention belongs to the field of microwave near-field measurement, and in particular relates to a device for on-site calibration of a phased array antenna. Background technique [0002] Phased array radar is named for its phased array antenna. It is used in military fields such as homeland air defense, missile defense system, shipboard, airborne and spaceborne fire control, early warning system, and even in radio astronomy, satellite communication, meteorological and hydrological The wide application of various sectors of the national economy such as air traffic control, earth exploration and biomedicine has attracted more and more attention and attention from the world. Phased array antennas are generally large in size, and many of them have tolerances in the manufacture and assembly of components, as well as the influence of mutual coupling between antenna elements, often causing considerable amplitude and phase errors in each channel, which cau...

AI Technical Summary

Problems solved by technology

This method is limited by the requirements of the test site, and it is easily affected by environmental scattering and multipath effects during the test process, which often has large errors and is difficult to use in the actual environment; the usual near-field calibration uses open waveguide, coupler Pole antennas and horn antennas are used as receiving antennas, but when measuring the radiation field of phased array radar antenna units, these receiving antennas are large in size, which can neither meet the one-to-one correspondence with the transmitting antenna units, nor solve the problem of adjacent antenna units. coupled field problem

Both patent CN 102472785 and patent CN 103105541B disclose a method and device for near-field measurement of electromagnetic fields. The near-field probe measures the light intensity change caused by the change of the electromagnetic field to obtain the information of the near-field radiation electromagnetic field of the antenna unit. The technology has a compact structure, Stable work and strong system compatibility, but these technologies can only measure the amplitude information of the electromagnetic field, and cannot meet the requirements of simultaneous calibration of the amplitude and phase of the phased array antenna. At the same time, the methods disclosed in the above two patents have a limited number of probes and Each probe needs a microwave signal processing link to realize the output of electromagnetic signals, which is not suitable for the calibration and measurement of the radiation field of a large number of antenna elements in the phased array antenna array, so a more accurate and faster on-site calibration is very much needed device for field calibration of phased array radar antennas

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