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To meet the needs of beamforming in broadband phased−array radar systems, optical beamforming technology achieves mechanical−scan−free operation by dynamically controlling the phase distribution of optical beams. It offers many advantages such as high precision, rapid response, and integration, demonstrating broad application potential across radar, communications, electronic warfare, and other fields. As a critical component in optical phased−array beamforming systems, the amplitude and time−delay accuracy of optical true−time−delay channels directly impact radar beam quality. Optical delay lines not only introduce different random amplitude and time delay inconsistencies, but also introduce inherent errors of the system. By analyzing the principles of phased arrays, the effect of ±2 dB amplitude and ±3 ps delay errors on beamforming was simulated. The result shows that the sidelobe suppression degrades by 13 dB under 30 dB channel weighting, beamwidth broadens, and the beam pointing deviates from the design value. Additionally, the beam distortion caused by accumulated nonlinear dispersion effect in dispersion−based delay line architectures is analyzed. The test system is constructed, and the tested results are consistent with the simulated results.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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