Compact schematic of high resolution Fourier telescopy imaging in strongly inhomogeneous atmosphere

摘要

It is well known that Fourier telescopy is the version of laser imaging radar realized by object illuminating with interfering laser beams generated by laser transmitters arrays and forming object's image from the energy of the field, scattered by the object. The resolution, the contrast in speckle pattern and the number of the speckles in the Fourier-telescopic image in the dependence on the dimensions and the configurations of the transmitting aperture and the receiving aperture in the general view and with regard to the known GLINT design are investigated. Integral correlation and local measures of Fourier-telescopic image relationship to true object image are proposed. Proposed measures determine the Fourier-telescopic image quality. They are shown that the image quality is good enough if the sizes of the receiving and transmitting aperture are approximately equal and the numbers of the speckles in the images of the object details are large enough. It is shown the possibility to use integral for reliable object recognition and local measure for calculating the accuracy of the object details parameters estimation. Compact symmetrical schematic of transmitting and receiving apertures for Fourier telescopy through strongly inhomogeneous atmosphere is presented. This is the united aperture containing the receiving aperture, consisted of the receiving uniform sections with the spacing between them less than half their size and the transmitting aperture with two equal mutually orthogonal linear arrays of laser transmitters arranged inside the receiving aperture aria among the receiving sections. It is shown that each from linear arrays can be situated in any place of a receiving aperture. Proposed schematic ensures the reconstruction of the undistorted highly quality image of the object at a great distance approximately 40 000 km with resolution about 0.4 m along mutually perpendicular directions in image plane.