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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.
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