CN113378419B - Infrared imaging simulation method based on MODTRAN optimization - Google Patents
Infrared imaging simulation method based on MODTRAN optimization Download PDFInfo
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Abstract
The invention discloses an infrared imaging simulation method based on MODTRAN optimization, which comprises the following steps: s1: collecting atmospheric path radiance, atmospheric transmittance, solar radiance, earth radiance and sky background irradiance data, and determining a zenith angle needing to be optimized according to the collected atmospheric path radiance, atmospheric transmittance, solar radiance, earth radiance and sky background irradiance data; s2: observing zenith angle optimization and solar zenith angle optimization simultaneously through the optimized zenith angle, and determining a specific zenith angle by inquiring an optimization method table; s3: and calling MODTRAN software to calculate a generated result through a target infrared irradiance formula received at the entrance pupil of the detector, and outputting the result.
Description
Technical Field
The invention relates to an infrared imaging simulation method, in particular to an infrared imaging simulation method based on MODTRAN optimization.
Background
In order to enable the sky background radiation intensity spectrum distribution to finally generate a background radiation power distribution image on the infrared detector focal plane, all influencing factors of sky background radiation need to be analyzed, and an accurate radiation energy transmission model of background radiation to the detector optical system focal plane is established. The infrared simulation is carried out by using MODTRAN software, and zenith angles are optimized, because when an observation geometric model is set, if a general observation range is large, the calculated amount is large, and the repeated work is high. The precision is slightly reduced, a radiation energy transmission model of background radiation to a focal plane of an optical system of the detector is established, a radiation power calculation method of the sky background on the focal plane is provided, and an infrared image of the sky background is generated by using the radiation power distribution of the sky background. And in the infrared simulation modeling process, when an observation geometric condition is established, the existing zenith angle range is optimized under the condition of large observation zenith angle or large solar zenith angle range to obtain one or more reasonable zenith angle in the range.
Disclosure of Invention
The invention aims to solve the technical problems that in the process of using MODTRAN atmospheric radiation transmission simulation software, when an observation geometric model is set, if the observation range is large, the calculated amount is large, and the repeated work is high. The accuracy is slightly reduced, and the purpose is to provide an infrared imaging simulation method based on MODTRAN optimization, so as to solve the problems.
The invention is realized by the following technical scheme: s1: determining a zenith angle type to be optimized according to five types of atmospheric path radiance, atmospheric transmittance, solar radiance, earth radiance and sky background irradiance, wherein the optimization type comprises an observation zenith angle and a solar zenith angle; s2: optimizing the observation zenith angle or optimizing the range of the solar zenith angle according to the optimized zenith angle type, and determining a specific zenith angle by inquiring an optimization method table; s3: and (4) calling MODTRAN software to set observation geometric conditions according to the optimized zenith angles, calculating by using a target infrared irradiance formula received at the entrance pupil of the detector to generate a result, and outputting the result.
Further, the optimization method table in step S2 includes three categories, which are calculation types, optimization methods, and remark information, where the calculation types include atmospheric path radiance, atmospheric transmittance, solar radiance, earth radiance, and sky background irradiance.
Furthermore, the optimization mode of the radiation brightness of the atmospheric path is that 10 degrees are taken when the zenith angle of observation is within the range of 0-19 degrees; when the observation zenith angle is within the range of 20-34 degrees, taking 27 degrees; when the observation zenith angle is within the range of 35-44 degrees, taking 40 degrees; when the observation zenith angle is within the range of 45-54 degrees, taking 50 degrees; when the observation zenith angle is within the range of 55-64 degrees, 60 degrees are taken; when the observation zenith angle is within the range of 65-79 degrees, taking down the odd observation zenith angles; when the zenith angle is observed to exceed 90 degrees, the test piece is symmetrical about the 90-degree center.
Further, the optimization mode of the atmospheric transmittance is that when the observation zenith angle is in the range of 0-29 degrees, 15 degrees are taken; when the observation zenith angle is within the range of 30-44 degrees, taking 37 degrees; when the observation zenith angle is within the range of 45-54 degrees, taking 50 degrees; when the observation zenith angle is within the range of 55-59 degrees, taking 57 degrees; when the observation zenith angle is within the range of 60-69 degrees, downwards taking an even number of observation zenith angles; when the zenith angle is observed to exceed 90 degrees, the test piece is symmetrical about the 90-degree center.
Further, the optimization mode of the solar radiation illumination is that when the sun zenith angle is in the range of 0-30 degrees, 15 degrees are taken; taking Esun _30- (Esun30-Esun40) × (X-30) when the zenith angle of the sun is within the range of 30-39 degrees; taking Esun _40- (Esun _40-Esun _ 50) × (X-40) when the zenith angle of the sun is in the range of 40-49 degrees; taking Esun _50- (Esun _50-Esun _ 60) × (X-50) when the zenith angle of the sun is within the range of 50-59 degrees; taking Esun _60- (Esun _60-Esun _ 70) (X-60) when the zenith angle of the sun is in the range of 60-69 degrees; taking Esun _70- (Esun _70-Esun _ 80) × (X-70) when the zenith angle of the sun is in the range of 70-79 degrees; wherein Esun _ x is the solar irradiance at x degrees.
Furthermore, the optimization mode of the earth radiation illumination is that when the observation zenith angle is within the range of 0-29 degrees, 15 degrees are taken; when the observation zenith angle is within the range of 30-49 degrees, taking 40 degrees; when the observation zenith angle is within the range of 50-64 degrees, 60 degrees are taken; when the observation zenith angle is within the range of 65-79 degrees, taking down odd number zenith angles; when the zenith angle is observed to exceed 90-180 degrees, the observation is symmetrical about the 90-degree center.
Furthermore, the optimization mode of the sky background irradiance is that 15 degrees are taken when the observed zenith angle is within the range of 0-19 degrees; when the observation zenith angle is within the range of 20-29 degrees, 25 degrees are taken; when the observation zenith angle is within the range of 30-39 degrees, taking 35 degrees; when the observation zenith angle is within the range of 40-49 degrees, taking 45 degrees; when the observation zenith angle is within the range of 50-69 degrees, downwards taking even number zenith angles; when the zenith angle is observed to exceed 90-180 degrees, the observation is symmetrical about the 90-degree center.
Further, the target infrared irradiance formula in step S3 is:
wherein L ispathRadiating luminance for an atmospheric path; l isselfIs the intrinsic radiance of the target; esunThe irradiance of the sun on the surface of the target skin; eearthThe irradiance of the earth on the surface of the target skin; eskyThe radiation illumination of sky background radiation on the surface of a target skin;
is the atmospheric average transmittance of the path, dimensionless;
is the reflectivity of the skin to ambient radiation. Here the BRDF coefficient, sr-1。
Compared with the prior art, the invention has the following advantages and beneficial effects:
1. according to the infrared imaging simulation method based on MODTRAN optimization, the following method can be performed on the observation zenith angle, the solar zenith angle or the observation wave band when the observation geometric model is set when calculating different types of radiometric degree or transmittance in the process of using MODTRAN atmospheric radiation transmission simulation software. When the observation range is large, the method can effectively reduce the calculation amount without influencing the calculation result precision.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a simulation flow chart of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
As shown in fig. 1, the infrared imaging simulation method based on MODTRAN optimization of the present invention includes the following steps: s1: determining a zenith angle type to be optimized according to five types of atmospheric path radiance, atmospheric transmittance, solar radiance, earth radiance and sky background irradiance, wherein the optimization type comprises an observation zenith angle and a solar zenith angle; s2: optimizing the observation zenith angle or optimizing the range of the solar zenith angle according to the optimized zenith angle type, and determining a specific zenith angle by inquiring an optimization method table; s3: and (4) calling MODTRAN software to set observation geometric conditions according to the optimized zenith angles, calculating by using a target infrared irradiance formula received at the entrance pupil of the detector to generate a result, and outputting the result.
The target infrared irradiance formula in step S3 is:
wherein L ispathRadiating luminance for an atmospheric path; l isselfIs the intrinsic radiance of the target; esunThe irradiance of the sun on the surface of the target skin; eearthThe irradiance of the earth on the surface of the target skin; eskyThe radiation illumination of sky background radiation on the surface of a target skin;
mean atmospheric permeability for pathwayThe excess rate is dimensionless;
is the reflectivity of the skin to ambient radiation. Here the BRDF coefficient, sr-1。
The optimization method table in step S2 is shown in table 1:
TABLE 1 optimization method Table
In actual use, the optimal optimized observation zenith angle and the optimal optimized observation zenith angle are selected through the table 1, large-angle and large-range calculation can be rapidly carried out, the calculation speed is increased, the calculation precision is guaranteed, the output speed in MODTRAN software can be effectively improved and optimized, and the working efficiency is improved.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (2)
1. An infrared imaging simulation method based on MODTRAN optimization is characterized by comprising the following steps:
s1: determining a zenith angle type to be optimized according to five types of atmospheric path radiance, atmospheric transmittance, solar radiance, earth radiance and sky background irradiance, wherein the optimization type comprises an observation zenith angle and a solar zenith angle;
s2: determining a specific zenith angle by inquiring an optimization method table;
s3: setting an observation geometric condition according to the optimized zenith angle by calling MODTRAN software, calculating by using a target infrared irradiance formula received at an entrance pupil of the detector to generate a result, and outputting the result;
the optimization method table in the step S2 includes three major categories, i.e., calculation type, optimization mode and remark information, wherein the calculation type includes atmospheric path radiance, atmospheric transmittance, solar radiance, earth radiance and sky background irradiance;
the optimization mode of the atmospheric path radiation brightness is that when the observation zenith angle is in the range of 0-19 degrees, 10 degrees are taken; when the observation zenith angle is within the range of 20-34 degrees, taking 27 degrees; when the observation zenith angle is within the range of 35-44 degrees, taking 40 degrees; when the observation zenith angle is within the range of 45-54 degrees, taking 50 degrees; when the observation zenith angle is within the range of 55-64 degrees, 60 degrees are taken; when the observation zenith angle is within the range of 65-79 degrees, taking down the odd observation zenith angles; when the observation zenith angle exceeds 90 degrees, the observation zenith angle is symmetrical about the 90-degree center;
the optimization mode of the atmospheric transmittance is that when the zenith angle is observed within the range of 0-29 degrees, 15 degrees are taken; when the observation zenith angle is within the range of 30-44 degrees, taking 37 degrees; when the observation zenith angle is within the range of 45-54 degrees, taking 50 degrees; when the observation zenith angle is within the range of 55-59 degrees, taking 57 degrees; when the observation zenith angle is within the range of 60-69 degrees, downwards taking an even number of observation zenith angles; when the observation zenith angle exceeds 90 degrees, the observation zenith angle is symmetrical about the 90-degree center;
the optimization mode of the solar radiation illumination is that when the zenith angle of the sun is within the range of 0-30 degrees, 15 degrees are taken; taking Esun _30- (Esun30-Esun40) × (X-30) when the zenith angle of the sun is within the range of 30-39 degrees; taking Esun _40- (Esun _40-Esun _ 50) × (X-40) when the zenith angle of the sun is in the range of 40-49 degrees; taking Esun _50- (Esun _50-Esun _ 60) × (X-50) when the zenith angle of the sun is within the range of 50-59 degrees; taking Esun _60- (Esun _60-Esun _ 70) (X-60) when the zenith angle of the sun is in the range of 60-69 degrees; taking Esun _70- (Esun _70-Esun _ 80) × (X-70) when the zenith angle of the sun is in the range of 70-79 degrees; wherein Esun _ x is the solar irradiance at x degrees;
the optimization mode of the earth radiation illumination is that 15 degrees are taken when the observation zenith angle is in the range of 0-29 degrees; when the observation zenith angle is within the range of 30-49 degrees, taking 40 degrees; when the observation zenith angle is within the range of 50-64 degrees, 60 degrees are taken; when the observation zenith angle is within the range of 65-79 degrees, taking down odd number zenith angles; when the observation zenith angle exceeds 90-180 degrees, the observation zenith angle is symmetrical about a 90-degree center;
the optimization mode of the sky background irradiance is that 15 degrees are taken when the observed zenith angle is in the range of 0-19 degrees; when the observation zenith angle is within the range of 20-29 degrees, 25 degrees are taken; when the observation zenith angle is within the range of 30-39 degrees, taking 35 degrees; when the observation zenith angle is within the range of 40-49 degrees, taking 45 degrees; when the observation zenith angle is within the range of 50-69 degrees, downwards taking even number zenith angles; when the zenith angle is observed to exceed 90-180 degrees, the observation is symmetrical about the 90-degree center.
2. The MODTRAN optimization-based infrared imaging simulation method according to claim 1, wherein the target infrared irradiance formula in step S3 is:
wherein L ispathRadiating luminance for an atmospheric path; l isselfIs the intrinsic radiance of the target; esunThe irradiance of the sun on the surface of the target skin; eearthThe irradiance of the earth on the surface of the target skin; eskyThe radiation illumination of sky background radiation on the surface of a target skin;
is the atmospheric average transmittance of the path, dimensionless;
is the reflectivity of the skin to ambient radiation.
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