Abstract:
Although DGPS provides positioning information
with high precision, when DGPS is unavailable in
some situations, stand-alone GPS has to be used in
vehicle navigation. The accuracy of standard GPS is
low due to position measurement errors. This paper
presents a frequency domain modeling approach to
model GPS errors and increase GPS positioning
accuracy. This approach models GPS errors using
shaping filter. External sensors are employed to
reduce GPS errors. This paper also presents an
approach to select external sensors to meet the quality
requirements of positioning system.
