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Modeling method for signal transmission step of internal field antenna measurement system

A technology for antenna measurement and transmission, which is applied in the field of signal processing and can solve problems such as affecting, raising the amplitude of side lobes, and affecting test accuracy.

Inactive Publication Date: 2012-11-28
NORTHWESTERN POLYTECHNICAL UNIV
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  • Application Information

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Problems solved by technology

However, when the performance of the absorbing material is not ideal, the multipath interference signals from the side wall and the rear wall will affect the test accuracy, especially for some high-gain, low-sidelobe antennas, it will have a great impact
refer to figure 1 As shown in Fig. 1, the strong reflection formed by the high main lobe beam when pointing to the side wall will increase the amplitude of the side lobe, and the multipath interference caused by this effect will be more serious

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  • Modeling method for signal transmission step of internal field antenna measurement system
  • Modeling method for signal transmission step of internal field antenna measurement system
  • Modeling method for signal transmission step of internal field antenna measurement system

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Embodiment Construction

[0019] The present invention will now be further described in conjunction with the implementation steps and drawings:

[0020] 1) Reference to the signal flow of microwave dark indoor antenna test figure 2 As shown, the tested antenna is selected as the transmitting antenna, the auxiliary antenna is the receiving antenna, and both the transmitting antenna and the receiving antenna are connected to the vector network analyzer through a cable. In the measurement process, the sweep signal is first transmitted by the vector network analyzer, and then transmitted through the feeder (cable 1) from the antenna under test placed on the turntable. After propagation in free space, the signal received by the auxiliary antenna passes through the feeder (cable 1). 2) Back to the vector network analyzer.

[0021] 2) Let the power transmitted by the vector network analyzer be P t , The loss of cable 1 is L 1 , The incident power of the transmitting antenna is P in , The echo power is P re , The...

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Abstract

The invention relates to a modeling method for a signal transmission step of an internal field antenna measurement system. Technical features of the modeling method are that using an idea of mathematical modeling, a modeling method of multipath interference in an anechoic chamber is provided, and that through mathematical modeling for direct waves and the multipath interference, transitive relations of signal amplitude and phase in an antenna test process are analyzed, and influences of the multipath interference on the antenna test process are obtained, thereby providing theoretical basis for analysis of inhibition and elimination of the multipath interference.

Description

Technical field [0001] The invention belongs to the field of signal processing, and specifically relates to a method for modeling and analyzing signal transmission of an infield antenna test system. Used in antenna parameter measurement, it can improve the accuracy of antenna parameter measurement. Background technique [0002] Antenna is an important radio device that transmits and receives electromagnetic waves. It has strict index requirements in different applications, so accurate measurement is essential. The document "Antenna Measurement Manual" (National Defense Industry Press) introduces that microwave anechoic chambers can provide a good test platform for antennas. By reasonably arranging absorbing materials, it can not only avoid the influence of external electromagnetic interference, but also can significantly reduce the indoor background reflection. It reduces the impact of environmental factors on the antenna test and better simulates the free space test conditions....

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 张麟兮郭静远宋鹏张曼张颖军张琦魏世京
Owner NORTHWESTERN POLYTECHNICAL UNIV