| 摘要: |
| 外辐射源探测具有隐蔽性、低能耗、低成本、抗打击等优势,在微波频段技术相对成熟。光频段的外辐射源探测受制于自由空间传输引起的光场退相干,难以从直达的非合作信号和回波信号中提取确定的相位关系。本文提出了以热光场存在的强度涨落关联建立直达波和回波间相关性的方法,不依赖于电磁波的相位信息；在该相关性的基础上首次分析了以太阳光、黑体辐射等为外辐射源进行目标测距的原理及方法的可行性；最后在实验室条件下基于黑体辐射外源成功实现目标测距,并指出未来进一步提升测距距离亟待解决的技术难题。基于光场强度涨落关联的外辐射源测距技术是值得大力发展的低成本、高效探测技术。未来突破相关技术瓶颈有望建立以太阳光或目标热辐射作外源的测距系统,在车载无源雷达测距、热像仪直接测距、深空目标测距等领域具备极大的应用前景。 |
| 关键词: 强度涨落关联 光学外辐射源雷达 无源测距 |
| DOI： |
| 分类号:TN958.98 |
| 基金项目:西安电子科技大学杭州研究院院士开放基金(XH-KY-202306-0290)；安徽省重点研究与开发计划(2022b13020003) |
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| Research of Passive Ranging by External Source Based on the Intensity Fluctuation Correlation of Light Field |
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| Abstract: |
| External radiation source detection has the advantages of concealment, low power consumption, low cost, anti-attack and so on. Passive LIDAR is limited by de-coherence caused by free space transmission, and it is difficult to extract definite phase correlation from direct non-cooperative signal and the echo signal. We presented a method to establish the correlation between direct wave and echo based on the intensity fluctuation correlation of thermal light, which does not depend on the phase information of electromagnetic wave. On the basis of such correlation, we analyzed the principle and feasibility of the method of target ranging by external radiation sources such as sunlight and blackbody radiation for the first time. Finally, we achieved target ranging based on blackbody radiation as external source under laboratory conditions, and point out the technical problems to be solved in the future. Passive ranging by the external radiation source based on the intensity fluctuation correlation of light field is a low-cost and efficient detection technology, which is worth vigorous developing. In the future, it is expected to break through the relevant technical bottlenecks to establish the sunlight or thermal radiation as the external ranging system, which has great application prospects in the field of vehicle passive radar, thermal imager direct ranging, deep space target ranging and other fields. |
| Key words: thermal light intensity fluctuation correlation passive LIDAR passive ranging |