CMG is the key attitude actuator of large spacecraft such as space station

and resolver is widely used in CMG gimbal servo system. But most integrated modules of resolver excitation and resolver-to-digital converter can not satisfy the space application demands of small size and low power consumption

so this paper proposes a resolver excitation and reolver-to-digital conversion system based on single DSP and some experiments are performed to examine its validity. Inverse tangent operation of the resolver-to-digital conversion is often performed by calling function or using a lookup table

but it needs a lot of operation or memory

sometimes even an additive memory chip is needed. It is very bad for high integration

so a linear angle calculation method with little operation or memory is proposed in this paper. The voltage amplitude of the resolver excitation can be reduced basing on enough angle precision. Then the CMG gimbal’s high integration and low power are realized. Experimental results show that the bulk

weight and power consumption of this system are reduced by more than 80 percents compared with the resolver excitation module JD20-D15C36MK and resolver-to-digital conversion module 19XSZ2413. The angle precision can reach 0.011

and the CMG gimbal motor has a good quality of rotation.