A method for diagnosing the distorted position of the aperture amplitude and phase field of an antenna array

Abstract

The invention provides a method for diagnosing the distortion position of an antenna array caliber amplitude phase field. According to the method, firstly, near-field data are subjected to near-fieldand plane wave spectrum transform, and then plane wave spectrum components in the space k are obtained. Secondly, the directional diagram correction of a probe and a unit on a k-space wave spectrum iscarried out. Finally, the inverse transformation is carried out on a plane wave spectrum-caliber field. In order to obtain more accurate data, the caliber field is reconstructed and the amplitude-phase distribution of an actual physical position on a caliber surface is obtained. Therefore, the distortion position of the caliber field or the excitation current, and a corresponding radiation unit are judged. The purpose of carrying out diagnosis on an antenna is achieved. According to the invention, the position of an antenna failure unit can be accurately positioned. Meanwhile, faults can be checked timely. A lot of test time is saved. Moreover, the quality of a directional diagram is improved in the inversion compensation mode. In addition, the fast fourier transform (FFT) is adopted to realize the efficient calculation. The method is high in engineering practicability.

Description

technical field [0001] The invention relates to the technical field of antenna near-field testing, in particular to a method for diagnosing the distortion position of the aperture amplitude and phase field of an antenna array. Background technique [0002] In recent years, array antenna technology, especially phased array antenna technology, has developed rapidly and has been widely used in various military and civilian radio systems. At present, the research and development tasks of domestic array antennas, especially phased array antennas, are very heavy. However, due to manufacturing and other reasons, there are a large number of unavoidable errors in the actual design of the antenna. In addition, the vibration of the array, the coupling between antenna elements, and the active device The aging of the radar antenna and the change of temperature characteristics will introduce unpredictable errors to the antenna or cause failure of the unit. This requires diagnosis and debu...

AI Technical Summary

Problems solved by technology

This method cannot accurately measure the amplitude and phase distribution of the antenna surface, because there is a strong multiple reflection effect between the probe and the AUT, and this effect will change with the sampling movement of the probe on the scanning surface, resulting in many Large diagnostic errors, and this method requires continuous manual movement of the probe and manual data recording, which will consume a lot of manpower and time costs

The second is to use the aperture inversion module embedded in the commercial software of NSI Corporation of the United States to diagnose the amplitude and phase of the aperture field. However, the aperture inversion module is regarded as a commercial secret abroad, and its principle and source code have not been disclosed. The outside world has no way of understanding its reflection. It is impossible to learn, learn from, or even improve and optimize on the basis of the principle, method and approach of performance; moreover, the caliber inversion module is mainly used on radar, which involves the defense industry, and there is a risk of radar parameter leakage when completely using software from other countries; finally, The caliber inversion module is packaged and exported as part of the software, which is expensive and cannot be used independently in China

[0005] The main disadvantage of the equivalent magnetic current method is that there is no probe pattern correction, which limits the practicality of this method

In the actual antenna test, due to factors such as frequency, sampling surface, and distance from the probe to the antenna, the number of sampling points may be even or odd, which leads to great restrictions on the use of traditional domestic methods.

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