Passive distance measuring method based on target infrared radiation spectrum and band model

Abstract

The invention discloses a passive distance measuring method based on a target infrared radiation spectrum and a band model. The method comprises the steps of (a) acquiring measurement data necessary for distance inversion through a corresponding sensing device, (b) establishing a distance measuring model based on the band model, and (c) establishing a passive distance measuring database and conducting object distance inversion. According to the method, the fact that the oxygen is evenly distributed in the atmosphere is utilized, a selected oxygen A absorption band is unitary in spectral line structure and has obvious features, an absorption cross section can be easily and accurately solved, interference of other gases in the atmosphere on measurement is avoided, oxygen concentration is stable, the influence of weather and districts is well avoided, and the established distance measuring model based on the band model solves the real-time problem during distance inversion. The technology not only can be used for fixing roadbed stations, but also can be applied to vehicle-mounted or airborne motion platforms, and has important application prospect in respect of infrared search and track systems and optoelectronic countermeasure.

Description

Technical field: [0001] The invention relates to a distance measurement method, in particular to a high-precision air-to-air passive distance measurement method based on infrared spectrum telemetry technology. technical background: [0002] At the end of the last century, infrared hotspot technology was successfully used in the Infrared Search & Track System (IRSTS). Since the infrared sensing system does not radiate any energy into the air, it only detects and tracks the target by receiving the thermal energy radiated by the target, so it is not easy to be detected or located, and has great anti-interference ability; in addition, IRSTS also has high angle measurement accuracy and Therefore, IRSTS, as an important passive detection system, has been widely used. Correspondingly, the research on the passive ranging technology that can be used in IRSTS is gradually in-depth. [0003] At present, the more feasible passive ranging techniques can be divided into three categories...

AI Technical Summary

Problems solved by technology

After years of improvement and development, the U.S. Air Force Institute of Technology has now studied the "passive ranging method of rocket plume based on infrared and visible band oxygen transmission attenuation" (see literature [2]: Vincent R A, Hawks M.R..Passive Ranging of Dynamic Rocket Plumes using Infrared and Visible Oxygen Attenuation[C], Proc.Of SPIE Acquisition, Tracking, Pointing, and Laser Systems Technologies XXV, 2010(8052): 80520D-1.) and "Passive ranging method based on CO2 infrared absorption" (See literature [3]: Macdonald D J. Passive Ranging Using Infrared Atmospheric Attenuation[J].Proc.Of SPIE Infrared Technology and Applications XXXVI, 2010(7660): 766041.), which compares the atmospheric transport of O2 and CO2 in detail characteristics, and proved that the band around 762nm has only the oxygen absorption band, which is not affected by the weather. Although the Line-By-Line (LBL) method used in it can give the accurate average absorption coefficient of the zone, the calculation is too large , takes up too much system resources and has poor real-time performance

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