<p>The quantification of remote sensing information requires spectral radiometric calibration technology support with high accuracy, and this technology can ensure the comparability, accuracy, and long-term stability of data acquisition for sensor. Now, the calibration technique traced to the absolute cryogenic radiometer (ACR) is the trend of development. To improve the accuracy of infrared absolute spectral responsivity, a gold-plated hemisphere reflector is added to a thermopile detector with electrical substitution pins. So an infrared electrical substitution radiometer (ESR) is developed as the standard transfer detector. The spectral response linearity, uniformity, and stability of ESR are tested by electric substitution technology. We also have established a radiometric calibration system based on ACR. The combined uncertainty in the spectral responsivity of this detector from 0.7 to 20 μm is about 0.99%. The application of infrared ESR to radiometric calibration can improve the calibration accuracy of detectors through its shorter calibration chain.</p>
The difficult point that impacting the traditional polarization image registration based on Fourier - Mellin
transform is calculating rotation angle of the image α and shrinkage variable coefficient <i>τ</i> of polarization
image registration .Based on Fourier - Mellin transform method, this paper proposes a improved algorithm that
on account of improving resolution in the θ coordinate direction in the Log-polar coordinate system, improve the
calculation accuracy of rotation angle of the image <i>α </i>and shrinkage variable coefficient <i>τ</i> .Through the
experiment and simulation results show that the improved algorithm than the traditional has higher registration
Artificial target has the characteristics of stronger polarization, which is found in the process of
researching polarization remote sensing. So the polarization characteristics of artificial target has become one of the
highlights in the research of the polarization remote sensing. Metal coating target is a kind of typical artificial target,
previous studies have found that metal coating target polarization reflection characteristics vary with the condition
of different observation angle and incidence angle, and the difference of polarization characteristics greatly impact
the derivation and accuracy of metal material surface. In order to research the characteristics of metal coating
surface bidirectional reflectance polarization, this measurement experiment set up four observation azimuth angle
and nine observation zenith angle .On the basis of the measured data by using the semi-empirical model for data
fitting, then get the data of metal coating target hemisphere space distribution of polarization reflection
characteristics . This paper analyzes the relationship between target surface polarization degree and observation
azimuth angle, observation zenith angle, which provides theory and data support for the derivation of typical
artificial target structure features.
In this paper we analyse the polarization imaging theory and the commonly process of the polarization imaging detection. Based on this, we summarize our many years’ research work especially in the mechanism, technology and system of the polarization imaging detection technology. Combined with the up-to-date development at home and abroad, this paper discusses many theory and technological problems of polarization imaging detection in detail from the view of the object polarization characteristics, key problem and key technology of polarization imaging detection, polarization imaging detection system and application, etc. The theory and technological problems include object all direction polarization characteristic retrieving, the optical electronic machinery integration designing of the polarization imaging detection system, the high precision polarization information analysis and the polarization image fast processing. Moreover, we point out the possible application direction of the polarization imaging detection technology both in martial and civilian fields. We also summarize the possible future development trend of the polarization imaging detection technology in the field of high spectrum polarization imaging. This paper can provide evident reference and guidance to promote the research and development of the polarization imaging detection technology.
According to problems of the intensity imaging target detection on water surface in foggy weather such as the indistinction of the target and greatly loss of the target detail, a target detection method based on the target polarization characteristics for water surface target in foggy weather is proposed in this paper. To validate the method’s effectiveness, the indoor experiment is performed by using the simulation environment in foggy weather and the outdoor experiment is performed by using the water surface real fog environment. A lot of different intensity images and polarization images are got and then analysed and compared. The experimental results demonstrate that the polarization imaging detection can effectively obtain the polarization information of targets on water surface, and we can detect the water surface targets in foggy weather by polarization information retrieving and the target information restoring.