The invention provides a fusion positioning method for a mine card in a
discharge port RTK failure scene, and the method comprises the following steps: a fusion
positioning system begins to take over when a task state is detected to accord with a
discharge area reversing task, and carries out the external parameter
verification through employing the RTK state information at an initial moment, calculating a
pose transformation value for performing
time synchronization on the
point cloud map
relocation speedometer information, the IMU-wheel speed
speedometer information and the RTK state information, and
synchronizing the IMU-wheel speed
speedometer information and the
point cloud map
relocation speedometer information to an RTK information moment; inputting IMU-wheel speed
odometer information,
point cloud map
relocation odometer information and RTK state information after
time synchronization into a
factor graph, and taking the RTK state information as a prior factor; all factors are multiplied, maximum posterior distribution is obtained through derivation and serves as current optimal
system state information,
system state information obtained after
factor graph optimization is monitored, and
system state information with normal optimization results is output. And the mine unmanned driving positioning requirement is met.