In the view of the problem existing in optical system for airborne pods, the type of optical system suitable for the compact space of airborne pods is analyzed, and the combination of the-three-mirror afocal system and the telephoto system are chosen. In this paper, the method of three-mirror-afocal system design based on primary aberration is explored. The structural parameters are calculated according to primary aberration coefficient. The procedure for calculating initial structural parameters is programmed. Then a three-mirror afocal system is designed with an entrance pupil diameter of 115mm, a field of view of 1.4°×1°, compression ratio of 5 times. The principle of telephoto system is introduced, and two relay optical systems are designed. The results indicate that the design values of the average modulation transfer function (MTF) are 0.43 and 0.57 respectively. The average MTF of dual channel systems are 0.37 and 0.55 respectively after the installation and adjustment. The main optical system and relay system in this paper have high imaging quality, and the modular design can be realized by replacing the relay system. The method of dual channel system can be used for multichannel airborne pods.
The WFE of the optical remote sensor system include the engineering from the fabrication processing, the position from deploying of segmented mirrors in orbit. In the process of feasibility demonstration, the total WFE error budget of large deployable optics plays a vital role in the general design of the remote sensor. According to results of calculation and iteration, in order to ensure the optical performance of the remote sensor in orbit, the WFE of the remote sensor is required to achieve λ/8rms (@ λ=632.8nm), and the WFE of the optical system is required to achieve λ/10rms(@ λ=632.8nm). In this paper, the error from optical system design, which based the mission realization of optical fabrication and optical alignment.
High resolution is important to earth remote sensors, while the vibration of the platforms of the remote sensors is a major factor restricting high resolution imaging. The image-motion prediction and real-time compensation are key technologies to solve this problem. For the reason that the traditional autocorrelation image algorithm cannot meet the demand for the simple scene image stabilization, this paper proposes to utilize soft-sensor technology in image-motion prediction, and focus on the research of algorithm optimization in imaging image-motion prediction. Simulations results indicate that the improving lucky image-motion stabilization algorithm combining the Back Propagation Network (BP NN) and support vector machine (SVM) is the most suitable for the simple scene image stabilization. The relative error of the image-motion prediction based the soft-sensor technology is below 5%, the training computing speed of the mathematical predication model is as fast as the real-time image stabilization in aerial photography.
Conformal imaging systems are confronted with dynamic aberration in optical design processing. In classical optical designs, for combination high requirements of field of view, optical speed, environmental adaption and imaging quality, further enhancements can be achieved only by the introduction of increased complexity of aberration corrector. In recent years of computational imaging, the adaptive coded apertures techniques which has several potential advantages over more traditional optical systems is particularly suitable for military infrared imaging systems. The merits of this new concept include low mass, volume and moments of inertia, potentially lower costs, graceful failure modes, steerable fields of regard with no macroscopic moving parts.
Example application for conformal imaging system design where the elements of a set of binary coded aperture masks are applied are optimization designed is presented in this paper, simulation results show that the optical performance is closely related to the mask design and the reconstruction algorithm optimization. As a dynamic aberration corrector, a binary-amplitude mask located at the aperture stop is optimized to mitigate dynamic optical aberrations when the field of regard changes and allow sufficient information to be recorded by the detector for the recovery of a sharp image using digital image restoration in conformal optical system.
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