Calculation Model for Optoelectronic Remote Sensing System’s Radiometric Resolution at Arbitrary Viewing Angles

Kolobrodov, V. H.; Lykholit, M. I.; Mykytenko, Volodymyr I.; Tiagur, V.M.; Dobrovolska, K. V.

doi:10.20535/radap.2017.69.30-34

Cited by 2 publications

(1 citation statement)

References 1 publication

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“…Ці характеристики обмежені просторовим або енергетичним розділенням [14]. Дослідженню ТПСС, ос нов ними компонентами яких є об'єктив і прий мач випромінювання, присвячено значну кількість наукових праць [2,8,10,12,18]. Водночас практично немає досліджень з розробки методів і алгоритмів визначення ймовірності виконання поставленого завдання із розрізнення цілей (виявлення, розпізнавання та ідентифікації) в залежності від дальності до цілі.…”

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Probability of Target Discrimination by the Contrast-Limited Thermal Vision System of a Uav

Kolobrodov,

Lykholit,

Tiagur

et al. 2023

Kosm. nauka tehnol.

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Equipping modern unmanned aerial vehicles (UAVs) with thermal imaging cameras expands their potential utilization in various environmental conditions, enabling efficient aerial reconnaissance and execution of combat-related tasks. The primary objec- tives for target discrimination encompass detection, recognition, and identification. However, existing methods and algorithms for determining the probability of distinguishing targets do not offer an efficient and swift means of calculating these probabili- ties based on the target’s distance. This article aims to develop a novel method for calculating the probability of detecting, recognizing, and identifying an object (target) using a thermal imaging surveillance system. The proposed approach involves an improved algorithm that utilizes the Johnson criterion, as per the NATO standard 4347, the Schultz approximation of the threshold contrast for the operator’s perception of the image on the display screen, and incorporates the objective function of probability transfer along with probability transfer functions based on the target’s distance. An example illustrating the calculation of the target discrimination probability is included to provide clarity. With the suggested algorithm, the probability of detecting, recognizing, and identifying the target through the contrast-limited thermal imaging system of the drone can be rapidly calculated.

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Probability of Target Discrimination by the Contrast-Limited Thermal Vision System of a Uav

Kolobrodov,

Lykholit,

Tiagur

et al. 2023

Kosm. nauka tehnol.

Self Cite

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The distortion of images in remote sensing systems at arbitrary angles of sight

Kolobrodov¹,

Lykholit²,

Tiagur³

et al. 2021

Kosm. nauka tehnol.

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Background. The main problem in launching space optical and electronic viewing systems (OEVS) for remote sensing of the Earth can be regarded as their high price, which even the leading countries of the world are not always ready to pay. Therefore, the quality of spacecraft systems imposed the most stringent requirements. One of the economically expedient options to increase the efficiency of space OEVS is scanning the Earth’s surface at arbitrary angles of sighting, which allows for the same time of service life to collect more information, but this in turn leads to image distortion. Therefore, analysis of the resulting image quality depending on the angles of sighting of the OEVS is an actual task that will assess the capabilities of the system and its conformance with the established requirements. Objective. Improving the physical and mathematical model of the modulation transfer function of the system “lens – matrix detector” and the study of the dependence of spatial and radiometric resolution on the angles of sight for the space OEVS when the sighting axis deviates from the nadir. Methods. Based on the analysis of signal generation models for television and thermal imaging space OEVS, it is proposed to use the concept – the contrast gray body. In the physical and mathematical model, it is proposed normalize to the spatial frequencies of objects at different angles of sight to the spatial frequencies in the nadir, and to calculate the radiometric resolution take into account the transmission and rarefied of the atmosphere, the image movement speed on the detector and its integration time. Results. Practical results of calculations of the offered physical and mathematical model for space OEVS showed that at deviation from nadir the effective spatial bandwidth worsens and at the specified parameters of system it is inexpedient scanning at angles of sighting greater than 30º. Accordingly, a comparative analysis of radiometric resolution for different type of detectors showed that the use of a photonic detector gives ~1.4 times better resolution in the nadir as opposed to the use of thermal detector and almost identical results are obtained at maximum angles of sighting. Also, a significant impact is made by a decrease a coefficient of atmospheric transmittance due to the rarefied of the atmosphere, which reaches from 26% to 45% that depends on the spectral range. Conclusions. Analysis of the results of the study confirms the possibility that photonic detectors can be replaced by modern thermal detectors with insignificant loss of image quality of the resulting image, which can significantly increase the service life of space OEVS.

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Calculation Model for Optoelectronic Remote Sensing System’s Radiometric Resolution at Arbitrary Viewing Angles

Cited by 2 publications

References 1 publication

Probability of Target Discrimination by the Contrast-Limited Thermal Vision System of a Uav

Probability of Target Discrimination by the Contrast-Limited Thermal Vision System of a Uav

The distortion of images in remote sensing systems at arbitrary angles of sight

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