Absolute radiometric calibration method for medium wave infrared focal plane array detector

Abstract

The invention provides an absolute radiometric calibration method for a medium wave infrared focal plane array detector. The absolute radiometric calibration method comprises the steps of: establishing an absolute radiometric calibration model, carrying out absolute radiometric calibration, utilizing an array detector with high calibration precision as a reference array detector, and carrying out cross calibrating on a target array detector; determining a cross calibrating reference array detector according to a ratio requirement for spatial resolution of the reference array detector and spatial resolution of the target array detector; selecting a calibration region through an earth surface uniformity requirement and observation parameter requirement; and acquiring radiation brightness at an entrance pupil position of the target array detector, and calculating to obtain an absolute radiometric calibration coefficient finally. The absolute radiometric calibration method solves the technical problems of the absolute radiometric calibration method for the medium wave infrared focal plane array detector without a full optical-path onboard blackbody device.

Description

technical field

[0001] The invention relates to an absolute radiation calibration method for a mid-wave infrared focal plane array detector, in particular to an absolute radiation calibration method for a mid-wave infrared focal plane detector without an on-board blackbody calibration device with an all-optical path. Background technique

[0002] The temperature of the earth's surface is generally 300K, and the radiation energy of the earth's surface is basically in the band above 3.0 μm. The mid-wave infrared focal plane array detector uses the space optical system to collect the mid-wave infrared radiation energy of 3.0 μm to 5.0 μm, which has the ability to penetrate smoke , dust, fog, snow, and the ability to identify camouflage, and can conduct quasi-all-weather observations in day and night. Temperature, ocean surface temperature, day and night cloud, coastline monitoring and other civil applications have a wide range of applications. Its quasi-all-weather observation...

Examples

Embodiment Construction

[0030] (1) Establishment of the absolute radiometric calibration model: based on the basic idea of ​​absolute radiometric calibration, and considering the linear working area when the detector is designed, the digital DN of the remote sensing image data of the mid-wave infrared focal plane array detector after relative radiometric correction is established. The linear quantitative relationship between the value information and the radiation energy information at the entrance pupil of the mid-wave infrared focal plane array detector;

[0031] DN R (m,n)=f[L(m,m)]

[0032] ①

[0033] =Gain×L(m,n)+Bias

[0034] In the formula: m, n are the position of detectors m ∈ [1, M], n ∈ [1, N];

[0035] DN R (m,n) is the digital DN value of the probe (m,n) after relative radiation correction;

[0036] L(m,n) is the radiation energy radiation value at the entrance pupil of the probe (m,n);

[0037] Gain and Bias are the absolute radiation calibration coefficients of the detector.

[...

technical field

[0001] The invention relates to an absolute radiation calibration method for a mid-wave infrared focal plane array detector, in particular to an absolute radiation calibration method for a mid-wave infrared focal plane detector without an on-board blackbody calibration device with an all-optical path. Background technique

[0002] The temperature of the earth's surface is generally 300K, and the radiation energy of the earth's surface is basically in the band above 3.0 μm. The mid-wave infrared focal plane array detector uses the space optical system to collect the mid-wave infrared radiation energy of 3.0 μm to 5.0 μm, which has the ability to penetrate smoke , dust, fog, snow, and the ability to identify camouflage, and can conduct quasi-all-weather observations in day and night. Temperature, ocean surface temperature, day and night cloud, coastline monitoring and other civil applications have a wide range of applications. Its quasi-all-weather observation...

Examples

Embodiment Construction

[0030] (1) Establishment of the absolute radiometric calibration model: based on the basic idea of ​​absolute radiometric calibration, and considering the linear working area when the detector is designed, the digital DN of the remote sensing image data of the mid-wave infrared focal plane array detector after relative radiometric correction is established. The linear quantitative relationship between the value information and the radiation energy information at the entrance pupil of the mid-wave infrared focal plane array detector;

[0031] DN R (m,n)=f[L(m,m)]

[0032] ①

[0033] =Gain×L(m,n)+Bias

[0034] In the formula: m, n are the position of detectors m ∈ [1, M], n ∈ [1, N];

[0035] DN R (m,n) is the digital DN value of the probe (m,n) after relative radiation correction;

[0036] L(m,n) is the radiation energy radiation value at the entrance pupil of the probe (m,n);

[0037] Gain and Bias are the absolute radiation calibration coefficients of the detector.

[...

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