A High-Speed ​​Passive Ranging Method Based on Oxygen Absorption and Multiple Regression

Abstract

The invention discloses a high-speed passive distance measuring method based on oxygen absorption and a multiple regression, mainly relating to a distance measuring method. The method comprises the following steps: receiving a target radiation signal which is subjected to atmospheric attenuation by using an infrared spectrometer; estimating the distance value of a target to be measured by using a Beer-Lambert law in combination with a multiple linear regression algorithm. The advantages of a Fourier transform multichannel are utilized fully, target distance information can be calculated by only measuring target radiation once without specifically assuming a target moving state or continuously tracking and repeatedly sampling the target, a the measuring process can be finished instantly, the detection distance is long, and high measuring reliability is realized. Moreover, selected oxygen adsorbs wave bands around 762 nm, thereby well eliminating the weather influences, ensuring the measuring accuracy. Furthermore, the high-speed passive distance measuring method has a significant application prospect on the aspects of infrared search tracking system and electro-optical 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...

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Problems solved by technology

After many 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, HawksM.R.PassiVe Ranging of Dynamic Rocket Plumes using Infrared and VisibleOxygen Attenuation[C], Proc.Of SPIE Acquisition, Tracking, Pointing, and LaserSystems Technologies XXV, 2010(8052): 80520D-1.) and "based on CO 2 Infrared Absorption Passive Ranging Method" (see literature [3]: Macdonald D J. Passive Ranging Using Infrared Atmospheric Attenuation [J]. Proc. Of SPIE Infrared Technology and Applications XXXVI, 2010 (7660): 766041.), more detailed description O 2 , CO 2 Atmospheric transmission characteristics, and proved that the band around 762nm has only the oxygen absorption band, which is not affected by the weather, but the band average absorption coefficient processing method used in it leads to a large error in the deduced distance value, and additional calculation of the target blackbody radiation baseline (Baseline ), resulting in too much calculation, poor real-time performance, and an additional calculation error introduced in the fitting of the baseline

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