Fan
Liu
Honeywell Laboratories
Navigation Section
fan.liu@honeywell.com
570
Vincent Hall
10:10 am
Global
Positioning System (GPS) is an all-weather 24-hour globally
available positioning system. Because of its high availability
and supreme accuracy, it has been widely used in navigation,
surveying, constructions, public services, military, space,
and other areas. In this presentation, the positioning method
of GPS is introduced. Three segments of GPS, the spacecraft,
the ground control system and the user equipment, and their
functions are discussed. GPS measurements and error sources
are presented in details since they are critical in designing
any GPS application systems. During the last two decades of
GPS utilization, methods have been developed to extend the
GPS capability to meet the requirements of various systems.
These systems include millimeter accuracy survey system, high
availability vehicle guidance and tracking system, and one
out of a billion error probability high integrity aircraft
landing system. Methods to achieve these applications are
presented. Finally, the mathematical problems we encountered
in designing an aircraft landing system are brought up for
discussions.
