Method for eliminating multipath interference in antenna test environment by adopting distance offset technology
A technology of multipath interference and distance offset, applied in the direction of the antenna radiation pattern, etc., can solve the problems of uncontrollable, multipath interference, raising the side lobe level, etc., to achieve the effect of reducing the impact, high gain, and low side lobe
Inactive Publication Date: 2014-09-03
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
There is multipath interference in the test environment (microwave anechoic chamber or open field). In conventional frequency domain measurements, the strong reflection of the main lobe beam when it points to the side wall will increase the level of the side lobe; when the performance of the absorbing material is not enough Ideally, multipath interference signals from side walls and rear walls will seriously affect the test accuracy
[0003] In the microwave anechoic chamber, as the test frequency band decreases, the multipath reflection on the side wall increases, making it difficult for the test accuracy of the antenna pattern to reach ±1dB; the frequency band below 100MHz deteriorates to more than ±2dB
In the field test, due to the uncontrollable external environment, the multipath interference is more serious
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[0042] Now in conjunction with implementation steps, accompanying drawing, the present invention will be further described:
[0043] 1) When measuring antennas in a microwave anechoic chamber, the frequency domain response includes multipath interference in addition to the direct signal. Let the straight-line distance between the transmitting and receiving antennas be d, and the distance traveled by the multipath interference be r. The amplitude of the direct wave signal is The phase of the direct signal is The attenuation coefficient of the absorbing material is Γ (a complex number less than 1), and the magnitude of multipath interference in the frequency domain response is The phase of multipath interference is Therefore, a comprehensive model of the direct signal and multipath interference in the antenna measurement system in the microwave anechoic chamber can be established, and its mathematical expression is: Among them, G t is the gain coefficient of the transmi...
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The invention relates to a method for eliminating the multipath interference in an antenna test environment by adopting a distance offset technology. A relation between a direct signal in the antenna test environment and a multipath interference signal is analyzed, two frequency responses in different test distances are tested and the distance offset technology is adopted to separate the direct signal from the frequency responses, so that the influence of the multipath interference on the antenna test can be eliminated and more accurate antenna test data is obtained. The method is particularly effective for a high gain and low minor lobe antenna.
Description
technical field [0001] The invention belongs to the field of antenna testing, and in particular relates to a method for eliminating multipath interference signals in an antenna testing environment and improving the accuracy of measuring antenna parameters (including pattern, gain, and other parameters) by using distance offset technology. Background technique [0002] To measure the actual radiation performance of an antenna, precise measurements are required. There is multipath interference in the test environment (microwave anechoic chamber or open field). In conventional frequency domain measurements, the strong reflection of the main lobe beam when it points to the side wall will increase the level of the side lobe; when the performance of the absorbing material is not enough Ideally, the multipath interference signals from the side wall and rear wall will seriously affect the test accuracy. [0003] In the microwave anechoic chamber, as the test frequency band decrease...
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IPC IPC(8): G01R29/10
Inventor 张麟兮郭静远张曼宋鹏张颖军魏世京张琦
Owner NORTHWESTERN POLYTECHNICAL UNIV