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A Performance Analysis of
a Tightly Coupled GPS/Inertial System for Two Integrity Monitoring Methods
March 2000
Dr. Young C. Lee, The MITRE Corporation
Daniel G. O'Laughlin, The MITRE Corporation
ABSTRACT
Use of an integrated GPS/inertial system can be effective in mitigating
the effects of GPS signal interference such as intentional jamming.
Currently the GPS/Inertial Working Group of RTCA SC-159 is developing
requirements and test procedures for a tightly coupled GPS/inertial
system. To support this Working Group, this paper investigates two of
the key issues being addressed by the Working Group. The first issue
is how well a tightly coupled GPS/inertial system can detect slowly
growing errors. This paper investigates this issue for two integrity
monitoring methods. The other issue relates to how long the system can
coast upon complete loss of GPS signals caused by interference. Using
analytic formulas, this paper determines maximum coasting times possible
under various scenarios.
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