CN107545082A - A kind of radiation effect computational methods in EO-1 hyperion emulation - Google Patents
A kind of radiation effect computational methods in EO-1 hyperion emulation Download PDFInfo
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- 230000000191 radiation effect Effects 0.000 title claims abstract description 7
- 238000000205 computational method Methods 0.000 title abstract 2
- 230000005855 radiation Effects 0.000 claims abstract description 89
- 238000004088 simulation Methods 0.000 claims abstract description 20
- 238000002310 reflectometry Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims description 14
- 238000004364 calculation method Methods 0.000 claims description 11
- 238000002834 transmittance Methods 0.000 claims description 6
- 230000005457 Black-body radiation Effects 0.000 claims description 4
- 230000003595 spectral effect Effects 0.000 claims description 3
- 238000005094 computer simulation Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The present invention relates to Computer Simulation field, the radiation effect computational methods in specifically a kind of EO-1 hyperion emulation.The present invention comprises the following steps：Determine parameter related to radiation in scene；According to itself radiation of target its own face temperature computation target；Reflection of the target to solar radiation is calculated according to sun parameter and target surface reflectivity；Calculate the reflection that target radiates to adjacent architectural itself；Target is calculated to reflection of the adjacent architectural to solar radiation：The radiation effect of target is calculated according to sun parameter and atmospheric environmental parameters.The present invention can effectively handle adjacent objects in EO-1 hyperion emulation and, for the radiation effect of target, improve simulation fidelity.
Description
Technical Field
The invention relates to the field of computer simulation, in particular to a radiation influence calculation method in hyperspectral simulation.
Background
The traditional infrared simulation method considers the radiation of the target and the radiation of the surrounding environment when modeling the radiation condition of the detected target. Whereas, in general, ambient radiation includes reflections of solar radiation, atmospheric radiation, ground radiation by the target.
In the hyperspectral simulation, the traditional simulation mode is not enough to reflect the radiation condition of a target. For example, when the object is located beside a building, the radiation properties of the object can be influenced by neighboring buildings, which is particularly noticeable in the case of hyperspectrum.
Disclosure of Invention
In order to improve the fidelity of the hyperspectral target radiation characteristic simulation, the invention provides a radiation influence calculation method in the hyperspectral simulation, which can effectively quantify the influence of the surrounding environment on the radiation characteristic of the target in a specific wave band and effectively improve the fidelity of the simulation calculation.
The technical scheme adopted by the invention for realizing the purpose is as follows: a radiation influence calculation method in hyperspectral simulation comprises the following steps:
determining a radiation-related parameter in the scene;
calculating the self-radiation of the target according to the surface temperature of the target; calculating the reflection of the target to the solar radiation according to the solar parameters and the reflectivity of the target surface; calculating the reflection of the target to the self radiation of the adjacent building; calculating the reflection of solar radiation by the target to the adjacent buildings:
and calculating the radiation influence of the target according to the solar parameters and the atmospheric environment parameters.
The radiation-related parameters in the scene include: surface material, adjacent distance, atmospheric environment, solar parameters.
The method for calculating the self-radiation of the target according to the self-surface temperature of the target specifically comprises the following steps:
and calculating the blackbody radiation according to Planck's law, and calculating the self radiation of the target according to the blackbody radiation and the target spectral emissivity.
The method for calculating the reflection of the target to the solar radiation according to the solar parameters and the reflectivity of the surface of the target specifically comprises the following steps:
the direct solar radiation is calculated by using Modtran, and the direct solar radiation is multiplied by the reflectivity of the surface of the target to obtain the reflection of the target to the solar radiation.
The method for calculating the reflection of the target to the self radiation of the adjacent building comprises the following steps:
calculating the atmospheric transmittance according to the atmospheric environment;
and calculating the radiation degree according to the surface temperature of the adjacent buildings, and further calculating the reflection of the target to the self radiation of the adjacent buildings.
The calculation of the reflection of the target to the solar radiation of the adjacent buildings specifically comprises the following steps:
the total radiance of solar radiation from adjacent buildings that can be received at any point on the target is expressed as:
wherein L issun(lambda) refers to the radiance of the sun's ground at the current atmospheric conditions, ρb(lambda) is the reflectivity of the building outer wall material to the lambda wave band, ξ (lambda) is the atmospheric transmittance of the wave band, rhor(λ) is the reflectivity of the target surface to the band radiation.
The method for calculating the radiation influence of the target according to the solar parameters and the atmospheric environment parameters comprises the following steps:
wherein,representing the sum of the reflection of the target by the adjacent building self-radiation and the reflection of the target by the adjacent building solar radiation, L (lambda, T) representing the target self-radiation, LrsunRepresenting the reflection of solar radiation by the target.
The invention has the following advantages and beneficial effects:
1. in the hyperspectral target radiation characteristic simulation process, the simulation fidelity of the target is improved by calculating the radiation influence of adjacent objects.
2. The influence of the surrounding environment on the final radiation characteristic in certain sensitive wave bands can be effectively calculated, and the simulation fidelity is improved.
Drawings
FIG. 1 is a diagram of a build scenario embodiment of the present invention;
fig. 2 is a graph of the calculation results of fig. 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
(1) Inputting scene data, including surface material, adjacent distance, atmospheric environment, solar parameters and the like:
determining relevant calculation data of a scene;
(2) calculating the self-radiation of the target:
calculating the self-radiation of the target according to the surface temperature of the target;
planck's law calculates the black body radiance:
further calculating the radiation brightness of a common object, wherein epsilon (lambda) is the target spectral emissivity
L(λ，T)＝Lb(λ，T)*ε(λ)
Wherein, λ represents the current wavelength, unit μm, T represents the thermodynamic temperature of the object, and unit K, c is the speed of light.
(3) Calculating the reflection of the target on the solar radiation:
calculating the reflection of the target to the solar radiation according to the solar parameters and the reflectivity of the target surface;
Lrsun＝Lsun*ρ(λ)
wherein L issunFor direct solar radiation, ρ (λ) is the target surface reflectivity.
(4) Calculating the reflection of the target to the self radiation of the adjacent building:
calculating the atmospheric transmittance according to the atmospheric environment;
and calculating the radiation degree according to the surface temperature of the adjacent buildings, and further calculating the reflection of the target to the self radiation of the adjacent buildings.
The radiance of the adjacent building received by any point on the target is:
wherein L isrb(λ) is the reflection of adjacent building radiation by the target, Lbp(lambda, T) is the radiance of the lambda wave band at T temperature of the unit effective radiation area on the adjacent building, ξ (lambda) is the atmospheric transmittance of the lambda wave band, rhor(λ) is the reflectivity of the target surface to the band radiation.
ξ (λ) is directly calculated by Modtran.
(5) Calculating the reflection of solar radiation by the target to the adjacent buildings:
and calculating the reflection of the target to the adjacent building radiation according to the solar parameter calculation and the atmospheric environment parameter. The total radiance of the solar radiation received from the adjacent buildings at any point on the target can be expressed as
Wherein L issun(lambda) refers to the radiance of the sun's ground at the current atmospheric conditions, ρbAnd (lambda) is the reflectivity of the building outer wall material to the lambda wave band.
(6) Calculating the radiation effect:
the reflection of the target from the adjacent building's own radiation and the reflection of the target from the adjacent building's solar radiation are both referred to as interference radiation. The target's own radiation and the reflection of solar radiation by the target are referred to as intrinsic radiation. The ratio of the interference radiation to the intrinsic radiation is referred to as the radiation effect.
Claims (7)
1. A radiation influence calculation method in hyperspectral simulation is characterized by comprising the following steps:
determining a radiation-related parameter in the scene;
calculating the self-radiation of the target according to the surface temperature of the target; calculating the reflection of the target to the solar radiation according to the solar parameters and the reflectivity of the target surface; calculating the reflection of the target to the self radiation of the adjacent building; calculating the reflection of solar radiation by the target to the adjacent buildings:
and calculating the radiation influence of the target according to the solar parameters and the atmospheric environment parameters.
2. The method for calculating the radiation effect in the hyperspectral simulation according to claim 1, wherein the parameters related to the radiation in the scene comprise: surface material, adjacent distance, atmospheric environment, solar parameters.
3. The method for calculating the radiation influence in the hyperspectral simulation according to claim 1 is characterized in that the method for calculating the self-radiation of the target according to the self-surface temperature of the target specifically comprises the following steps:
and calculating the blackbody radiation according to Planck's law, and calculating the self radiation of the target according to the blackbody radiation and the target spectral emissivity.
4. The method for calculating the radiation influence in the hyperspectral simulation according to claim 1 is characterized in that the method for calculating the reflection of the target on the solar radiation according to the solar parameters and the reflectivity of the surface of the target specifically comprises the following steps:
the direct solar radiation is calculated by using Modtran, and the direct solar radiation is multiplied by the reflectivity of the surface of the target to obtain the reflection of the target to the solar radiation.
5. The method for calculating the radiation influence in the hyperspectral simulation according to claim 1, wherein the step of calculating the reflection of the target to the self radiation of the adjacent building comprises the following steps:
calculating the atmospheric transmittance according to the atmospheric environment;
and calculating the radiation degree according to the surface temperature of the adjacent buildings, and further calculating the reflection of the target to the self radiation of the adjacent buildings.
6. The method for calculating the radiation influence in the hyperspectral simulation according to claim 1 is characterized in that the calculation of the reflection of solar radiation by the target on the adjacent buildings is specifically as follows:
the total radiance of solar radiation from adjacent buildings that can be received at any point on the target is expressed as:
<mrow> <msub> <mi>L</mi> <mrow> <mi>r</mi> <mi>b</mi> <mi>s</mi> <mi>u</mi> <mi>n</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>&lambda;</mi> <mo>)</mo> </mrow> <mo>=</mo> <msubsup> <mo>&Integral;</mo> <mn>0</mn> <mi>S</mi> </msubsup> <msub> <mi>L</mi> <mrow> <mi>s</mi> <mi>u</mi> <mi>n</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>&lambda;</mi> <mo>)</mo> </mrow> <mo>*</mo> <msub> <mi>&rho;</mi> <mi>b</mi> </msub> <mrow> <mo>(</mo> <mi>&lambda;</mi> <mo>)</mo> </mrow> <mo>*</mo> <mi>&xi;</mi> <mrow> <mo>(</mo> <mi>&lambda;</mi> <mo>)</mo> </mrow> <mo>*</mo> <msub> <mi>&rho;</mi> <mi>r</mi> </msub> <mrow> <mo>(</mo> <mi>&lambda;</mi> <mo>)</mo> </mrow> <mi>d</mi> <mi>s</mi> </mrow>
wherein L issun(lambda) refers to the radiance of the sun's ground at the current atmospheric conditions, ρb(lambda) is the reflectivity of the building outer wall material to the lambda wave band, ξ (lambda) is the atmospheric transmittance of the wave band, rhor(λ) is the reflectivity of the target surface to the band radiation.
7. The method for calculating the radiation influence in the hyperspectral simulation according to claim 1, wherein the calculating the radiation influence of the target according to the solar parameters and the atmospheric environment parameters comprises:
<mrow> <msub> <mi>L</mi> <mrow> <mi>inf</mi> <mi>l</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>&lambda;</mi> <mo>)</mo> </mrow> <mo>=</mo> <mfrac> <mrow> <msubsup> <mo>&Integral;</mo> <mn>0</mn> <mi>S</mi> </msubsup> <mrow> <mo>(</mo> <msub> <mi>L</mi> <mrow> <mi>b</mi> <mi>p</mi> </mrow> </msub> <mo>(</mo> <mrow> <mi>&lambda;</mi> <mo>,</mo> <mi>T</mi> </mrow> <mo>)</mo> <mo>+</mo> <msub> <mi>L</mi> <mrow> <mi>s</mi> <mi>u</mi> <mi>n</mi> </mrow> </msub> <mo>(</mo> <mi>&lambda;</mi> <mo>)</mo> <mo>*</mo> <msub> <mi>&rho;</mi> <mi>b</mi> </msub> <mo>(</mo> <mi>&lambda;</mi> <mo>)</mo> <mo>)</mo> </mrow> <mi>d</mi> <mi>s</mi> <mo>*</mo> <mi>&xi;</mi> <mrow> <mo>(</mo> <mi>&lambda;</mi> <mo>)</mo> </mrow> <mo>*</mo> <msub> <mi>&rho;</mi> <mi>r</mi> </msub> <mrow> <mo>(</mo> <mi>&lambda;</mi> <mo>)</mo> </mrow> </mrow> <mrow> <mi>L</mi> <mrow> <mo>(</mo> <mi>&lambda;</mi> <mo>,</mo> <mi>T</mi> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>L</mi> <mrow> <mi>r</mi> <mi>s</mi> <mi>u</mi> <mi>n</mi> </mrow> </msub> </mrow> </mfrac> </mrow>
wherein,to show the eyesThe sum of the reflection of the target on the adjacent building self-radiation and the reflection of the target on the adjacent building solar radiation, L (lambda, T) representing the target self-radiation, LrsunRepresenting the reflection of solar radiation by the target.
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| CN104880701A (en) * | 2014-09-23 | 2015-09-02 | 航天恒星科技有限公司 | Satellite-borne sensor imaging simulation method and device |
| CN105243289A (en) * | 2015-11-17 | 2016-01-13 | 上海无线电设备研究所 | Integrated modeling method for infrared radiation characteristic of complicated target |
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Patent Citations (3)
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| CN101477197A (en) * | 2009-01-24 | 2009-07-08 | 哈尔滨工业大学 | Simulation method used for woodland complex scene high-spectrum remote sensing data |
| CN104880701A (en) * | 2014-09-23 | 2015-09-02 | 航天恒星科技有限公司 | Satellite-borne sensor imaging simulation method and device |
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