在白天减少照明条件下,反射频段 (Vis,NIR,SWIR,eSWIR) 的性能进行比较
Applied optics
|December 1, 2023
概括
低光条件降低了对象检测的传感器性能. 波长较长的SWIR和eSWIR波长受影响最大,建议积极照明或发射模式进行改进.
科学领域:
- 遥感 遥感 遥感 遥感
- 光学物理学的光学物理学
- 传感器技术 传感器技术
背景情况:
- 白天的低光条件 (多云,黎明,黄昏) 在反射波段中挑战对象歧视.
- 减少照明会降低传感器的信号噪声比 (SNR),影响范围的性能.
- 在较长的波长下,由于太阳光的减少,性能降低更为明显.
研究的目的:
- 将可见 (Vis),近红外 (NIR),短波红外 (SWIR) 和扩展的SWIR (eSWIR) 频段在减少照明下的性能进行比较.
- 评估低照明阻碍物体检测范围性能的限制条件.
- 调查云层覆盖和白天时间对不同波段传感器性能的影响.
主要方法:
- 使用被动,灵敏度和分辨率匹配的测试台进行实验和理论分析.
- 对Vis (0.4-0.7μm),NIR (0.7-1μm),SWIR (1-1.7μm) 和eSWIR (2-2.5μm) 频段进行比较.
- 在不同的照明水平下评估续航里程性能,包括黎明,黄昏和阴天条件.
主要成果:
- 在黎明和黄昏期间观察到SWIR和eSWIR的显著范围性能下降.
- 由于SNR低,eSWIR频段在重云覆盖下表现出最大的范围降低.
- 性能模型证实了对云类型/厚度和白天时间的强烈依赖.
结论:
- 减少照明严重影响传感器范围的性能,特别是在更长的波长 (SWIR,eSWIR).
- 主动照明或利用eSWIR的发射元件可以在低光场景中增强SNR.
- 优化传感器选择和照明策略对于在具有挑战性的光线条件下可靠的对象歧视至关重要.
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