Wide-field and Large Aperture Optical System Design for Groundbased Photoelectric Detection

摘要

Detection and recognition of space objects with ground-based photoelectric systems is one of the major technical waysfor space situational awareness. During the past thirty years, there has been significant development of optical telescopesdedicated to wide-field surveys of time-dependent deep space phenomena, slow-moving near-earth objects (NEOs) andfast-moving earth-orbiting space debris. While telescope fields of view have gradually increased, a single technicalapproach has not emerged as the dominant design. To design an effective wide-field telescope for sky survey or spacesurveillance, It is necessary to carefully match the characteristics of the optical system (layout, aperture, focal ratio andmodulation transfer function) with those of the observing site (sky brightness, transparency, seeing and elevation), thedetector (pixel pitch, quantum efficiency, read rate and read noise), and the observing program (target brightness, targetmotion, observing strategy and feature extraction software). In this paper, we design a telescope with wide field of view(≥2.5°×3.5°) and large aperture (1.1m). The focal length of the system is 1.5m, F/# is 1.36. Because of the small Fnumberand wide field of view, we choose the prime focus corrector structure which has single mirrors with refractiveprime focus correctors. Moreover, the especial requirements of the Modulation Transfer Function (MTF), spot, energyconcentration, and distortion etc. are all satisfied.