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Preliminary Feasibility Analysis of GPS IIIC Integrated with an Inertial System to Provide CAT IIIB Services
March 2010
Young C. Lee, The MITRE Corporation
Curtis A. Shively, The MITRE Corporation
Tan (Tyler) Zou, The MITRE Corporation
ABSTRACT
This paper describes a preliminary analysis of the
potential for an integrated GPS IIIC/inertial navigation
system to provide Category IIIB (CAT IIIB) precision
approach and landing services. The CAT IIIB landing
requirements are expressed as restrictions on the vertical
navigation sensor error (NSE) to ensure a high probability
of safe landing under both fault-free and faulted
conditions. In particular the most restrictive requirement
dictates the probability of missed detection of a satellite
range fault. The integrated system comprises a navigation
grade inertial sensor tightly coupled with a GPS receiver,
using pseudorange and delta range measurements to
update the inertial measurements. GPS fault detection is
performed by applying a threshold to the innovation
residual (difference between predicted and measured
ranges). A Monte Carlo simulation is used to estimate
missed detection performance of the integrated system.
Both step faults and ramp faults are considered. Results
indicate that the integrated GPS IIIC/inertial system as
modeled could likely meet the CAT IIIB fault detection
requirements for any size step or ramp without even using
delta range measurements.
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