The paper presents an adaptive scheme of a GPS (Global Positioning System)
Kalman filter. The adaptive scheme is capable of estimating the covariance
in response to the changing dynamics in GPS navigation. When augmenting a K
alman filter, the adaptive scheme may lead to a more accurate position upda
te. Moreover, the estimation method can also be used in integrity monitorin
g to enhance the selection of threshold for fault erection. The proposed me
thod is verified using simulated data.