Digital Autopilot Sample Rate Selection Based on Control System Requirements.

摘要

The purpose of this paper is to discuss some considerations in the selection of a sample rate for the digital autopilot. The missile autopilot design which incorporates a digital computer or microprocessor(s) to implement the stability compensation equations requires considerations over and above those made for analog computer autopilots. Some of these considerations are: the selection of sampling frequency, the A/D converter wordlength, the phase lag contributed by the zero order data hold (i.e., the A/D converter), the transport lag in the digital computer, and the effects of sampling high frequency sensor and structural (bending) noise (foldover or aliasing). (Author)