Planar phased array antenna fast measurement and automatic calibration method

Abstract

The present invention provides a planar phased array antenna fast measurement and automatic calibration method. The method includes the following steps that: the patterns, amplitudes, phases and beam widths of measured phased array antenna units and a test probe are obtained through a near-field antenna test; the probe is arranged in front of a measured phased array antenna, one of channels in the measured phased array antenna is opened in turns with the other channels closed, the coefficients of transmission between each of the channels and the probe are tested; the transmission coefficient matrix of the whole array plane of the phased array antenna can be obtained; the initial phases of the channels are calculated through using relative position relationships between the probe and the measured phased array antenna units; and if the fluctuation of the initial phase of the array plane is larger than half of the minimum phase shift quantity of phase shifters used by the array antenna, the initial phase is calibrated. The method of the invention has the advantages of short testing time and high test precision, and can not only be used for the rapid amplitude-phase calibration of a planar phased array antenna, but also can be used for the automatic detection of the amplitude of the channel units of the antenna and the prediction of the far-field pattern of the planar phased array antenna.

Description

technical field [0001] The invention relates to an automatic calibration device for the amplitude and phase of a planar phased array antenna, which is applied in the field of phased array radar. Background technique [0002] With the continuous expansion of the design scale of the planar phased array antenna, new challenges are raised for the efficiency of debugging, phase calibration of array unit channels, amplitude detection and pattern testing during use. The modern planar phased array antenna with tens of thousands of measurement unit channels is a complicated technical subject, which involves comprehensive mathematics, microwave technology, antenna and electromagnetic field theory, modern control technology, intelligent instrumentation technology, etc., and is extremely practical. strong technology. [0003] At present, most phase calibration and array detection of phased array antennas use single-channel independent testing, and all other channels are turned off duri...

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Problems solved by technology

[0004] (1) The traditional calibration method requires the probe to be aligned with each channel unit, which requires a very high position accuracy during movement. At present, most measurements of planar phased array antennas are performed manually, which brings great errors, and When calibrating a large array, the amount of data is large and it takes a long time

[0005] (2) As the test of the traditional planar phased array antenna takes a long time, it is difficult to take the average value of multiple measurements, which brings a large system error and human error

[0006] (3) In the traditional planar phased array antenna measurement, after obtaining the amplitude and phase information of the channel unit, it is impossible to quickly monitor the channel, correct the amplitude and phase calibration, and predict the pattern

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