Abstract
In this paper, a new on-orbit polarization calibration method for the multichannel polarimetric camera is presented. A polarization calibration model for the polarimetric camera is proposed by taking analysis of the polarization radiation transmission process. In order to get the polarization parameters in the calibration model, an on-orbit measurement scheme is reported, which uses a solar diffuser and a built-in rotatable linear analyzer. The advantages of this scheme are sharing the same calibration assembly with the radiometric calibration and acquiring sufficient polarization accuracy. The influence of the diffuser for the measurement is analyzed. By using a verification experiment, the proposed method can achieve on-orbit polarization calibration. The experimental results show that the relative deviation for the measured degree of linear polarization is 0.8% at 670 nm, which provides a foundation for the accurate application of polarimetric imaging detection.
Highlights
The polarimetric remote sensing camera is an optical detection system, which is designed for the polarimetric imaging of the target
We propose a new on-orbit polarization calibration method, which is called the on-orbit rotating analyzer polarization calibration method
The center-to-limb variation (CLV) obtained from the ZIMPOL I polarimeter system shows that the peak Stokes Q/I is very small and this polarization effect is discontinuous in the spectrum [22]
Summary
The polarimetric remote sensing camera is an optical detection system, which is designed for the polarimetric imaging of the target. This paper intends to provide an on-orbit polarization calibration method for a multichannel polarimetric camera with DoAM. This method has many technological advantages, such as a high maturity and stability, wide spectral range, and large field of view. The commonly used on-orbit calibration methods include the scene calibration, the on-board polarized light source method and the spaceborne linear polarization method. The on-board polarized light source method (see Figure 3) has the highest precision, which is used by the Earth Observing Scanning Polarimeter (EOSP) [11] The advantage of this method is that the polarization calibration can be taken in real time. When the polarimetric camera observes the atmosphere in a specific angle, the on-board polarizer will create polarized light which can be used for the calibration.
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