研究目的
Investigating the enhancement of time gating techniques and the impact of different probe configurations for creating a virtual array to mitigate echo influences on antenna pattern measurements in highly-reflective environments.
研究成果
The enhanced time gating method effectively mitigates the Gibbs phenomenon, allowing for the use of signal contributions at the edges of the measured bandwidth. Forming virtual arrays from multiple probe positions further improves echo suppression, with better results achieved when probes are sufficiently distant from the walls. The combination of these techniques approaches the accuracy of measurements in anechoic environments.
研究不足
The study is limited by the bandwidth of the measurements (1.5 to 3.5 GHz) and the highly-reflective environment, which introduces significant echo contributions. The effectiveness of echo suppression techniques is also dependent on the distance of the probes from the walls.
1:Experimental Design and Method Selection:
The study involves measuring antenna patterns in a highly-reflective environment using a quasi-metallic chamber. Time gating and virtual array techniques are employed for echo suppression.
2:Sample Selection and Data Sources:
Measurements are taken with a DRH18 double-ridged horn antenna as a probe and a DRH400 double-ridged horn antenna as an AUT, focusing on frequencies from
3:5 to 5 GHz. List of Experimental Equipment and Materials:
DRH18 and DRH400 double-ridged horn antennas, quasi-metallic chamber (Mosquito chamber), probe positioning stage, AUT rotation stage.
4:Experimental Procedures and Operational Workflow:
The AUT is rotated in ?- and φ-directions, and the probe is translated in x-, y-, and z-directions to collect measurement samples. Time gating is applied to the frequency domain signal, and virtual arrays are formed from multiple probe positions.
5:Data Analysis Methods:
The Fast Irregular Antenna Field Transformation Algorithm (FIAFTA) and the Generalised Minimal Residual Method (GMRES) are used for data analysis and echo suppression.
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