Microwave measurement method and measurement system based on phase center rotation

Abstract

The invention provides a microwave measurement method based on phase center rotation. The method comprises the steps that a rotating device is placed above a radiation loudspeaker to be tested; a microwave receiving antenna is arranged at the far end of a cantilever of the rotating device; the rotating center line position of the rotating device is regulated, so that the phase center of the radiation loudspeaker to be tested is positioned on the rotating center line of the rotating device; the microwave receiving antenna is regulated, so that the microwave receiving antenna is aligned with the radiation loudspeaker to be tested; when the rotating device rotates, the microwave receiving antenna receives microwave signals of the radiation loudspeaker to be tested; continuous or stepping measurement is performed. The microwave measurement has the advantages that the relevance of a measurement system and a radiation phase center is structurally built through a rocker arm; the rotation center of the rocker arm is enabled to be aligned with the phase center through a laser centering device; the precise aiming of the measurement device on the phase center of a radiation system is realized; the measurement device is enabled to point to the phase center all the time during the rocker arm rotation; the problem of precise phase center finding incapability of a traditional measurement method is solved.

Description

technical field [0001] The invention belongs to the fields of mechanical automation and high-power microwave (HPM), and invents a microwave measurement method and a measurement system based on phase-centric rotation. Background technique [0002] In the research of high power microwave (HPM) technology, the power of the HPM source is one of the main indicators to evaluate the performance of the HPM source. Because HPM has the characteristics of high peak power, short pulse, single pulse or pulse train, many conventional microwave power measurement methods It cannot be directly used in high power microwave power measurement. At present, the power measurement of HPM sources generally adopts online coupling measurement method, radiation field power density integration method and calorimeter method. The radiation field power density integration method is to measure the radiation field power density distribution, and then integrate to obtain the high power microwave source power....

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Problems solved by technology

[0008] (1) The measurement of the radiation field is based on the integration of the radiation spherical wave. The center of the spherical wave is the phase center of the radiation horn. However, in the existing radiation field measurement method, the measurement system is separated from the radiation system, and there is no physical connection, therefore, there is no guarantee that the measurement system is aligned radially;

[0009] (2) Since the phase center cannot be accurately determined, in the existing radiation field measurement, there are large deviations in the position of the test point relative to the phase center and the direction of the test system, resulting in large errors in the measurement results;

[0010] (3) In order to obtain the distribution of the radiation pattern and the integrated power, it is necessary to test the power density at different points. However, the existing test methods usually use manpower to move, which cannot guarantee the repeatability, and the efficiency is very low;

[0011] (4) The existing radiation field measurement system is located in a strong electromagnetic radiation environment. After the microwave signal passes through the receiving horn and the directional coupler, it needs to pass through a section of microwave cable and enter the attenuator and detector to convert the microwave signal into a video signal. For data acquisition; the existence of microwave cables leads to a large measurement uncertainty in the measurement system

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