Abstract: A two-dimensional servo turntable based on DC brushless torque motor is developed, wh ich has the function of solar tracking and all-sky scanning. It can achieve 10〞 positioning accuracy on two freedom degrees of 360 °horizontal and 180 °pitching, which can meet the requirement of tracking precision of fully automatic satellite tracking observation. The turntable uses torque motors and other corresponding low-temperature devices suitable for low-temperature environments. It can work normally in the range from -40 ℃ to 50 ℃ to meet the demand of field application. The compact and lightweight design makes the turntable more portable. The control system of the turntable adopts a wide temperature development board based on ARM9 architecture, and the Linux kernel is transplanted into the board. The kernel supports the addition of a variety of functional modules. It is beneficial to the improvement and perfection of the function in the later stage of the turntable. The turntable can not only operate under the control of the upper computer software, but also work independently under the guidance of its own internal program. It is equipped with micro-fiber spectrometer detection module, which can be used for spectral scanning measurement of skylight background radiation.

Key words: turntable, torque motor, skylight background, ARM