A highly accurate digital architecture for demodulating low rate narrow band phase angle modulated sensor signals was developed. Phase resolution finer than half a clock LSB period of time has been achieved. The application of interest for such a readout is to demodulate and digitize signals from inertial instruments in a guidance system. Several demodulation architectures have been evaluated and discussed. A general treatment of phase digitization resolution and accuracy limitations has been presented, applicable to all digital phase measurement implementations that result in synchronization induced quantization errors, including the most commonly used digital and digitizing phase locked loops. Thesis Supervisor: Donald E. Troxel Title: Professor Thesis Supervisor: Edmund Foster Title: Draper Staff

Measurement and digitization of phase angle modulated sensor data

: Three applications of digital technology to an Inertial Measurement Unit (IMU) were studied - the stabilization servo, sinewave generation, and temperature control. The SHIP (Small Hardened Inertial Platform) served as a vehicle for this study, but the techniques developed are applicable to a wide range of guidance systems.

Edmund R. Foster

Papers

Digital IMUE Study.