Digital Autopilot Sample Rate Selection Based on Control System Requirements

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Abstract:

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 microprocessors 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 AD converter wordlength, the phase lag contributed by the zero order data hold i.e., the AD converter, the transport lag in the digital computer, and the effects of sampling high frequency sensor and structural bending noise foldover or aliasing.

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