研究目的
To propose and demonstrate a three-channel ?lter-based non-imaging passive ranging system based on oxygen absorption for estimating the range of an emissive target in a covert manner.
研究成果
The proposed three-channel ?lter-based non-imaging passive ranging system based on oxygen absorption is feasible, with averaged range errors of 2.14% in short range and 6.72% in long range experiments. The system provides a new method for practical application of passive ranging based on oxygen absorption.
研究不足
The system's accuracy is affected by variations in source intensity, atmospheric turbulence, and sensor noise. The transmission uncertainty increases as the signal-to-noise ratio decreases. Background radiation and scattered light in the field of view can corrupt range estimates.
1：Experimental Design and Method Selection:
The system utilizes three band pass ?lters to estimate the oxygen band-average transmission near 762 nm and three spectral measurement channels to capture the band pass signals simultaneously. A transmission model based on line-by-line algorithm is established to derive path length from band-average transmission.
2：Sample Selection and Data Sources:
A 1000 W halogen lamp is used as the target in both short range (100 m to 300 m) and long range (1945 m) experiments.
3：List of Experimental Equipment and Materials:
Three band pass ?lters centered at 751 nm, 765 nm, and 780 nm; Hamamatsu H10722-01 PMTs; a 1000 W halogen lamp.
4：Experimental Procedures and Operational Workflow:
The system is aimed at the target, and signals from the three PMTs are collected simultaneously. The band-average transmission of oxygen is calculated and compared to the predicted curve to estimate the range.
5：Data Analysis Methods:
The band-average transmission of oxygen is calculated using a linear interpolation of the non-absorption shoulders baseline intensities. Range is estimated by comparing the measured transmission to the predicted curve.
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