Adaptive infrared dual-band passive ranging method

Abstract

The invention discloses an adaptive infrared dual-band passive ranging method which is used for solving the problems of a small ranging range and poor target applicability and poor calculation real-time performance of an existing method. The method comprises a step of using an infrared detector to carry out one time measurement on a target, and evaluating a target type according to different irradiance proportions of target radiation which is attenuated through atmospheric transmission on different wave band sensors, a step of calculating a light extinction coefficient and an atmospheric transmittance by using the temperature and humidity parameters measured by temperature and humidity sensors, a step of allowing the target to be equivalent to black bodies of different temperatures, selecting two windows with many radiation energies as working bands, and establishing an infrared dual-band passive ranging model, and a step of using the infrared detector to carry out the real-time measurement on the target, and applying the passive ranging model to calculate a target distance. The method has a large distance measurement range and high distance measurement precision for a high temperature target in air and a ground normal temperature or low temperature target and can be used for the passive positioning of air and ground infrared targets.

Description

technical field [0001] The invention belongs to the technical field of photoelectric detection and photoelectric countermeasures, and mainly relates to a passive ranging method for infrared targets, which can be used for passive positioning of infrared targets in the air and on the ground. Background technique [0002] In the electronic countermeasure environment, compared with the active ranging radar system, the passive ranging method is highly sought after because of its good concealment and strong anti-interference ability. The infrared detection system is a typical passive detection system. Since it does not radiate any energy to the target, 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 by the target, and has great survivability ; At the same time, the infrared detection system also has a strong ability to distinguish counterfeit, therefore, the infrared detection system has been...

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Problems solved by technology

At present, the U.S. Air Force Institute of Technology has studied the "Rocket Plume Passive Ranging Method Based on Infrared and Visible Band Oxygen Transmission Attenuation" (see document [1]: 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 TechnologiesXXV, 2010(8052): 80520D-1.), belongs to the category of infrared single-band passive ranging, and explains in detail that O 2 , CO 2 Atmospheric transmission characteristics, and proved that the band near 762nm has only the oxygen absorption band, which is not affected by the weather. Although the line-by-line integration method used can give the accurate average absorption coefficient of the zone, the calculation amount is too large and the system resources are too occupied. Many, poor real-time performance

In China, the "infrared two-color single-station passive positioning method" studied by Qiao Ya and others (see literature [2]: Qiao Ya, Lu Yuan, Yang Hua. Infrared two-color single-station passive positioning method [J]. 35(1):100-103.), belongs to the category of infrared dual-band passive ranging, chooses two atmospheric windows of 0.75~3 / 3~5μm as the working band, and designs an infrared two-color single station for cooperative targets and non-cooperative targets The passive positioning algorithm proves the correctness and effectiveness of the method through the calculation of examples, and analyzes the influence of the difference of the two-color extinction coefficient and the temperature of the target on the performance of ranging and positioning, and obtains that the smaller the difference of the two-color extinction coefficient, The higher the temperature, the more conducive to the conclusion of ranging and positioning, but this positioning algorithm only has better ranging accuracy for air targets above 1000K within a range of 20km. For low-temperature targets, such as objects below 500K, Even in the range of 5km, the ranging effect is very poor, so it can be seen that the application range of the positioning algorithm to the target is narrow

"Infrared three-color passive ranging" researched by Lu Yuan et al. (see literature [3]: Lu Yuan, Feng Yunsong, Ling Yongshun, et al. Infrared three-color passive ranging [J]. Optical Precision Engineering, 2012, 20(12) :2680-2685.), belongs to the category of infrared three-band passive ranging, selects three wavelengths of 8.5μm, 9.0μm and 9.5μm as the color ratio bands, deduces the target radiation intensity color ratio and the target temperature, radiation transmission distance, atmosphere The relationship between the extinction coefficients, when the atmospheric extinction coefficient is relatively fixed, the target is measured by measuring the ratio of the radiation intensity of different wavelengths, and the infrared tristimulus distance equation is deduced, but the detection accuracy of the distance measurement formula is seriously affected. Limited to the surrounding environment and detection distance of the target

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