Polarization Detection Performance of Directional Polarimetric Camera

Bihai, 涂碧海 Tu; Jin, 洪津 Hong; Pingping, 姚萍萍 Yao; Binhuan, 孟炳寰 Meng; Yinlin, 袁银麟 Yuan; Miaomiao, 张苗苗 Zhang; Jianwen, 翁建文 Weng

doi:10.3788/aos202040.0712003

Cited by 2 publications

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“…First, the calibration flowchart starts from level-1 data, which means the relative transmittance of the polarizer T and the polarization rate of the optics ε cannot be tested by this method. After launch, the variation in these two parameters was tested and considered stable by Tu et al from level-0 data [27]. Second, our calibration method only considered one aerosol profile.…”

Section: Discussionmentioning

confidence: 99%

The Operational Inflight Radiometric Uniform Calibration of a Directional Polarimetric Camera

Chen

Luo

et al. 2021

Remote Sensing

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The directional polarimetric camera (DPC) on-board the GF-5A satellite is designed for atmospheric or water color detection, which requires high radiometric accuracy. Therefore, in-flight calibration is a prerequisite for its inversion application. For large field optical sensors, it is very challenging to ensure the consistency of radiation detection in the whole field of view in the space environment. Our work proposes a vicarious in-flight calibration method based on sea non-equipment sites (visible bands) and land non-equipment sites (all bands). Combined with environmental parameters and radiation transmission calculations, we evaluated the radiation detection accuracy of the 0° to 60° view zenith angle of the DPC in each band. Our calibration method is based on the single-day normalized radiance data measured by the DPC. Through data selection, enough calibration samples can be obtained in a single day (the number of desert samples is more than 5000, and the number of calibration samples of the ocean is more than 2.8×106). The measurements are compared with the simulation of 6SV VRT code or look-up tables. The massive amount of data averages the uncertainty of a single-point calculation. Although the uncertainty of a single sample is significant, the final fitting of the curve of the variation in the radiometric calibration coefficient with the observation angle can still keep the root mean squared error at approximately 2–3% or even lower, and for visible bands, the calibration results for both ocean sites and desert sites are in good agreement regarding the non-uniformity of the sensor.

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Section: Discussionmentioning

confidence: 99%

The Operational Inflight Radiometric Uniform Calibration of a Directional Polarimetric Camera

Chen

Luo

et al. 2021

Remote Sensing

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“…Unexploded ordnance (UXO) is a worldwide problem and a long-term hazard that can remain active and destructive for decades after the end of a conflict, thereby endangering humanity, making the rapid and effective detection of UXO of great importance to human civilization [1] . Spectral polarization imaging technology can obtain two-dimensional spatial information, one-dimensional spectral information, and polarization state information such as Degree of linear polarization(DoLP), Angle of linear polarization(AoLP), polarization ellipticity and rotation direction of the target, thus characterizing some information that is more difficult to characterize with intensity measurements, such as the chemical composition properties, roughness, surface texture characteristics and edge information of the target surface [2][3][4][5][6] . Compared to conventional light intensity detection, greatly increasing the information content of remote sensing data, which is of great value for target detection, especially in military applications [7] .…”

Section: Introductionmentioning

confidence: 99%

Research on hyperspectral polarization detection for unexploded ordnance target identification

Zhang,

Li,

et al. 2023

3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023)

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By analyzing the principle of polarization detection, a method of identifying unexploded ordnance using polarization spectral information is presented. Then a polarization hyperspectral detection system was designed. Finally, the system was used to conduct detection experiments on mines in the background of cluttered grass at 400-1000nm band. The experimental results indicated that the polarization characteristics of the unexploded ordnance and the natural background were different, and the use of polarization detection technology could well distinguish the unexploded ordnance from the natural background and improve the accuracy of target detection and scene identification, especially in the 450-800 nm band to achieve effective detection and identification of camouflaged targets from the cluttered background.

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Polarization Detection Performance of Directional Polarimetric Camera

Cited by 2 publications

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The Operational Inflight Radiometric Uniform Calibration of a Directional Polarimetric Camera

The Operational Inflight Radiometric Uniform Calibration of a Directional Polarimetric Camera

Research on hyperspectral polarization detection for unexploded ordnance target identification

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