The focal plane of remote sensor is an important part in the development of remote sensor. At present, the single detector module can not meet the requirements of linear array due to the influence of detector material, processing technology, detector scale, resolution, spectral band number and other indicators. Therefore, in order to meet the need of large field of view of remote sensing camera, it is necessary to arrange the detectors in a certain way, and form a long pixel to meet the field of view. This paper presents the characteristics of various common stitching methods and summarizes the application of various stitching methods in remote sensors.
Due to the limitation of the existing technology and raw materials, the length of a single CCD and the number of spectral segments that can be integrated on a single CCD are all limited. The optical splicing method of all reflection and all transmission is usually used. In order to increase the number of spectral segments, the focal plane is usually divided into multiple channels by using a spectroscope. To avoid the introduction of the beam splitting components, a splicing and registration method of multispectral focal plane is proposed. First of all, the method and principle of optical splicing and registration are analyzed. Then the form of nine segments focal plane is designed. A single 4-band detector and a single 5-band detector are assembled into a 9-band focal plane according to the field splicing method, and then multiple 9-band focal planes are assembled into a 9-band long linear array focal plane. And the corresponding multi-segment light source is designed in combination with the existing splicing equipment. The light source can not only realize the convenient switching of multiple spectral segments, but also improve the image brightness and detail resolution. Finally, the splicing test of nine segments is carried out and test results are given: the straightness of focal plane splicing is 1.0μm, the coplanar accuracy is 7μm, and the multispectral registration accuracy is 0.5μm, which is equivalent to that of single four and five segment splicing focal plane. The results show that the method is reasonable and feasible, and the accuracy meets the acquirements.
Due to the influence of optical distortion, TDICCD camera will have imaging blur in the process of push broom imaging. From the angle of focal plane stitching, the principle of imaging blur leaded by optical distortion is analyzed, and a compensation method of nonlinear focal plane stitching is proposed. The principle of the method and the mathematical model of optimum stitching design are introduced. Take the off-axis three-mirror optical system as an example, the focal length of the optical system is 10m, the F number is 16, the design field of view 2ω is 1.4°, and the maximum distortion in the design field is 1%.The nonlinear stitching method is designed, and the optimal stitching angle is calculated. Compared with the linear stitching method, the design result of the nonlinear stitching method can decrease the maximum fuzzy value from 0.61 pixels to 0.2 pixels, and the 𝒇𝑴𝑻,𝑫 from 0.858 to 0.984.This study could provide the reference for focal plane design of long focal length and wide field space camera.
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