Study on cloudless sky background radiation characteristic in passive ranging based on oxygen spectral absorption

Zhang Yu; Liu Bingqi; Wei Heli; Hua Wenshen; Yan Zongqun

Oxygen absorption rate is the core of passive ranging technology calculation which used oxygen A band. The cloudless sky background radiation and blackbody radiation which contained oxygen A absorption bands was researched. The oxygen absorption rate distribution of cloudless sky background was calculated under the different conditions of observation zenith angle, times and solar zenith angle used CART. Then the calculation results was compared with the oxygen absorption rate of blackbody radiation with different observation zenith angle at different distances. The results show that the oxygen absorption rate of blackbody radiation is greater than the oxygen absorption rate of cloudless sky background radiation when the detection distance is more than 3 km. So depending on different viewing conditions to set the oxygen absorption rate threshold will improve the detection probability of the target and reduce the influence of background radiation on passive ranging.

1. Department of Electronics and Optics Engineering,Ordnance Engineering College,Shijiazhuang 050003,China;

2. Key Laboratory of Atmospheric Composition and Optical Radiation,Anhui Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Hefei 230031,China

Received Date: 2014-05-11

Rev Recd Date: 2014-06-15

Publish Date: 2015-01-25

Key words:

Abstract: Oxygen absorption rate is the core of passive ranging technology calculation which used oxygen A band. The cloudless sky background radiation and blackbody radiation which contained oxygen A absorption bands was researched. The oxygen absorption rate distribution of cloudless sky background was calculated under the different conditions of observation zenith angle, times and solar zenith angle used CART. Then the calculation results was compared with the oxygen absorption rate of blackbody radiation with different observation zenith angle at different distances. The results show that the oxygen absorption rate of blackbody radiation is greater than the oxygen absorption rate of cloudless sky background radiation when the detection distance is more than 3 km. So depending on different viewing conditions to set the oxygen absorption rate threshold will improve the detection probability of the target and reduce the influence of background radiation on passive ranging.

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Study on cloudless sky background radiation characteristic in passive ranging based on oxygen spectral absorption

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