The invention belongs to the technical field of navigation, and particularly discloses a combined navigation method for improving an AEKF
algorithm under a GNSS incomplete condition, which comprises the following steps of: executing the following operations in each filtering period of the AEKF
algorithm: determining state priori
estimation in the current filtering period based on a
state transition matrix and a
state vector in the previous filtering period, the
state vector is constructed based on the position, the speed and the
clock error of the
receiver; based on the state
noise variance matrix and the error
covariance matrix in the previous filtering period, determining error
covariance priori
estimation in the current filtering period; correcting an
observation matrix and a measurement
noise variance matrix based on the dynamic weight coefficients of the GNSS and the Loran C; and based on the corrected
observation matrix and the corrected measurement
noise variance matrix, obtaining the Kalman
gain in the current filtering period, and updating the prior
estimation. According to the invention, the overall performance of the integrated
navigation system under the condition that the GNSS is incomplete can be improved.