Abstract: An apparatus and method for determining the angular position of a rotor. The rotor is a part of a resolver used to determine the position of a shaft, or the like, in operation in a system such as a shaft in a missile gimbal. A digital signal processor is used advantageously to reduce cost. The inherently poorer performance of a data sampling approach in the presence of noise, as compared to the prior art tracking converter approach, is overcome by novel application of the digital signal processor and related circuitry.