An anti-jamming antenna pattern measurement method based on hybrid shielding room

Abstract

An anti-jamming antenna pattern measurement method based on a hybrid shielding room, selects two antennas, one antenna to be tested and the other to calibrate the antenna, measures the radiation pattern of the calibrated antenna in a standard darkroom environment, and obtains the transmission coefficient of the calibrated antenna ; In the mixed shielding room environment, first place the antenna under test on the indoor turntable, control the antenna under test to rotate, and obtain the rotation matrix of the antenna under test; then place the calibration antenna on the turntable for rotation to obtain the rotation of the calibration antenna Matrix; calculate the correlation coefficient matrix of the antenna under test and the calibration antenna, as well as the rotation pattern and spherical wave coefficient matrix of the antenna under test and the calibration antenna at different turntable positions; use the spherical wave coefficient matrix and the correlation coefficient matrix to reconstruct the The pattern of the antenna under test, and at the same time use the calibration antenna transmission coefficient to compensate the pattern of the antenna under test, and complete the reconstruction and compensation of the antenna under test. The invention improves the radiation pattern of the antenna to be tested under the mixed test environment.

Description

technical field [0001] The invention belongs to the technical field of microwave measurement, and in particular relates to an anti-interference antenna pattern measurement method based on a mixed shielding room. Background technique [0002] The hybrid shielded room creates a static, anisotropic and multipath environment by placing loads or absorbers in the room, and can simulate a specific spatial channel model. In the wireless communication test, each newly proposed application model needs to be tested in the environment of the directional channel, which provides the necessary test basis and standardized method for the hybrid shielded room, and the hybrid shielded room has its own construction cost. , operability and flexibility of the system make it have broad application prospects and potential in the wireless communication industry. Correlative microwave measurement studies have demonstrated the feasibility of a hybrid shielded room in creating a sample spatial channel...

AI Technical Summary

Problems solved by technology

For example, in a non-ideal darkroom test environment, when the performance of the indoor absorbing material is poor or the absorbing structure is not installed in some corners, and the spherical near-field test still has the problem of spherical reflection path interference, it will cause the antenna radiation pattern The interference caused by the multi-reflection paths in the chamber appears on the measurement results, and damages the characteristic parameters such as the main lobe, side lobe and directivity of the pattern. At this time, the traditional test area field compensation method cannot compensate well. In addition, in a non-ideal reverberation chamber, if the antenna to be tested on the turntable fails to rotate according to the predetermined angle or the chamber is not stirred uniformly, it will cause incomplete or defective spherical scattering signals, and then The correlation coefficient of the antenna under test cannot be accurately calculated from the S parameters obtained by the vector network analyzer. Therefore, the method of reconstructing the correlation coefficient can only obtain the antenna pattern under test containing reflection path interference, but cannot reversely reconstruct it. Construct a complete antenna far-field radiation characteristics

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