Fault Detection in Digital Filters for Satellite Systems

Abstract

This paper describes the application of database search techniques to simulate on-line fault detection in satellite communication systems. Conventional methods of fault detection by hardware is difficult in complex Digital Signal Processing (DSP) circuits which handle real-time data. Hence, a space search method using an Artificial Intelligence (AI) language - Prolog, is developed and it is shown that this approach complies with the requirement of on-board fault detection circuits. Application of the space search method to two key elements in DSP circuits - the multiplier and Adder/Subtractor is described. Implementation of such a novel fault detection method on-board a satellite, has constraints in terms of space and weight and the tradeoff needed is explained. Use of AI based search methods to analyse on-board satellite systems, are not only useful for fault detection but also for other diagnostic jobs in satellites.