研究目的
To determine the radiation pattern of an antenna under test from measurements in a highly reflective, fully metallic environment by eliminating the influence of reflecting walls through data processing.
研究成果
The proposed echo suppression method, combining temporal and spatial filtering, effectively removes echo contributions in highly reflective environments, achieving accuracy comparable to anechoic measurements. This approach is validated through S-Band measurements, showing low error levels in retrieved far-field patterns.
研究不足
The method requires a large number of frequency points and probe locations, leading to increased measurement and post-processing effort. It may be limited by the bandwidth of the AUT and the decay time of signals in the chamber.
1：Experimental Design and Method Selection:
The experiment involves measuring antenna radiation patterns in a fully metallic chamber using a combination of time domain and frequency domain techniques for echo suppression. A field synthesis concept is employed to create a virtual probe array that minimizes echo contributions.
2：Sample Selection and Data Sources:
The antenna under test (AUT) is a DRH400 dual ridged horn, and measurements are taken with a DRH18 probe at multiple frequencies and probe locations.
3：List of Experimental Equipment and Materials:
A fully metallic chamber (7.5 m × 4 m × 3.5 m with aluminum net walls), DRH18 dual ridged horn probe, DRH400 dual ridged horn AUT, probe tower for movement in x-, y-, z-directions, AUT positioner for rotation around ?- and ?-axes, and measurement system for frequency sweeps.
4：5 m × 4 m × 5 m with aluminum net walls), DRH18 dual ridged horn probe, DRH400 dual ridged horn AUT, probe tower for movement in x-, y-, z-directions, AUT positioner for rotation around ?- and ?-axes, and measurement system for frequency sweeps.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Measurements are obtained for 132 probe positions at four distances from the AUT, with full spherical rotations at 2.5° steps, across 1001 frequencies from 1.5 GHz to 3.5 GHz. Data is processed using time gating and spatial filtering, followed by near-field far-field transformation with FIAFTA.
5：5° steps, across 1001 frequencies from 5 GHz to 5 GHz. Data is processed using time gating and spatial filtering, followed by near-field far-field transformation with FIAFTA.
Data Analysis Methods:
5. Data Analysis Methods: Data is analyzed using Fast Fourier Transform (FFT) and inverse FFT for time gating, field synthesis for virtual array creation, and FIAFTA algorithm for transformation to far-field patterns. Error is computed using logarithmic and root mean square error metrics.
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