A dynamic target capable of simulating in-motion imaging

Abstract

The invention discloses a dynamic target capable of simulating moving imaging, which adopts an air bearing and a motor to realize low disturbance and high stable rotation; adopts a grating ruler to realize accurate measurement of angle, angular velocity and angular acceleration; adopts a ULE cylindrical glass cover As the base of the target pattern, the high stability and continuity of the target pattern can be realized; the Kohler illumination system is adopted to ensure the uniformity and radiance performance of the target pattern illumination; the multi-pitch and phase gradient stripes are used as the target pattern, which can accurately analyze and eliminate Effects of phase mismatch. The above-mentioned stand-alone machines are organically combined to form a dynamic target, which has a wide range of continuous variable speed functions, extremely high precision, and extremely small disturbances. It can accurately simulate dynamic scenes with continuously changing speeds and speed directions, and meets the quantitative evaluation of moving imaging. It provides an important basis for accurate performance analysis and testing of imaging systems in motion.

Description

technical field [0001] The invention relates to the technical field of space optical remote sensing, in particular to a dynamic target capable of simulating moving imaging. Background technique [0002] Traditional optical remote sensing satellites mainly adopt passive push-broom imaging mode. The direction and size of the push-broom velocity remain unchanged during the continuous imaging process, and the imaging parameters of the camera are stable. Imaging optical remote sensing satellites in motion, as a new generation of high-performance optical remote sensing satellites, have good maneuverability, stability, and independent matching capabilities of imaging parameters, and can perform active push-broom imaging, that is, they can Realize smart curve imaging. The imaging parameters of optical remote sensing satellites for imaging in motion are complex and changeable, and have the characteristics of high resolution, high line frequency, high TDI series, and high matching pr...

AI Technical Summary

Problems solved by technology

[0007] 1) The traditional dynamic target uses a mechanical axis, which is affected by the disturbance of the mechanical axis itself. The scene simulation accuracy of the dynamic target is low, and the stability is poor. Only qualitative evaluation can be performed, and quantitative evaluation cannot be performed;

[0008] 2) The traditional dynamic target can only rotate at a constant speed, and cannot rotate at a variable speed according to the planned motion speed curve, and cannot perform dynamic imaging performance evaluation with time-varying speed;

[0009] 3) The traditional dynamic target can only rotate in one direction, and cannot simulate the imaging performance in motion in the bidirectional scanning mode;

[0010] 4) For traditional dynamic targets, the target fringe phase is static, not gradual, and cannot quantitatively analyze the mismatch between target fringes and pixels

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