  This paper presents a methodology for research and development of the
inferencing and knowledge representation aspects of an Expert System approach
for performing reasoning under uncertainty in support of a real time vehicle
guidance and navigation system. Such a system could be of major benefit for
non-terrain following low altitude flight systems operating in foreign hostile
environments such as might be experienced by NOE helicopter or similar mission
craft. An innovative extension of the evidential reasoning methodology, termed
the Sum-and-Lattice-Points Method, has been developed. The research and
development effort presented in this paper consists of a formal mathematical
development of the Sum-and-Lattice-Points Method, its formulation and
representation in a parallel environment, prototype software development of the
method within an expert system, and initial testing of the system within the
confines of the vehicle guidance system.
