Airborne distributed position and orientation system (POS) relies on transfer alignment to achieve high-precision motion information of remote sensing imaging payloads at three nodes. However, the flexibility effect between nodes severely affects the transfer alignment accuracy, which in turn limits the improvement of baseline measurement accuracy. Aiming at this problem, an array POS system is designed on the basis of quasi-rigid distributed POS, and the fiber grating sensor is used to obtain deformation information to assist the main system to provide high-precision measurement information to the sub-system for transfer alignment. Finally, a ground dynamic test verification platform is built to verify the baseline measurement accuracy. The experimental results show that the array POS can achieve accurate measurement of flexible baselines between multiple nodes, and the baseline measurement ac-curacy is within 0.17mm under the condition of 5.6m baseline, which can provide theoretical support for the application of array POS.
As a high-resolution, non-destructive internal structure three-dimensional imaging technology, digital holographic microscopy tomography can provide advanced and safe detection technologies and research tools for the development of high-tech such as life sciences, clinical medicine, and new materials. In order to reduce the reconstruction time and improve the quality of reconstruction, the compressive sensing theory is applied to holographic imaging. Compressive holography technology can not only achieve the tomographic reconstruction of objects from a small amount of holographic data, but also solve the problem of crosstalk between the layer and the layer and the elimination of noise in the tomographic reconstruction process, and the effect is particularly obvious. In this paper, the dynamic compressive sensing theory is applied to the field of three-dimensional digital holographic microscopy, which is different from the fixed sampling method used in the general compressive holographic imaging. It achieved fast 3D digital holography and improved axial resolution. We obtained holographic tomography images at a sampling rate of 6.25%, doubling the axial resolution without loss of reproduction image resolution.
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