A resolver excitation and reolver-to-digital conversion system based on a single DSP is designed and some experiments are carried out to examine its validity.A linear angle calculation method with little operation or a few memories is proposed,for the inverse tangent operation of the resolver-to-digital conversion in an original system needs complex computations and a large memoried space,even an additive memory chip. Then,the voltage amplitude of the resolver excitation is reduced based on enough angle precision to obtain an excellent integrated system combinng the resolver excitation and reolver-to-digital conversion system and to provide the low power consumption of the system.The experimental results can offer the angle precision of 0.013°,and the CMG gimbal motor velocity precision of 0.000 4°/s.The bulks,weights and power consumption of this system have reduced by more than 80% compared with those of the resolver excitation module JD20-D15C36MK and resolver-to-digital conversion module 19XSZ2413,which meets the space application demands of small size and low power consumption.