Combined navigation system for outdoor movable target

The invention relates to a combined navigation system used for an outdoor movable target, belonging to the combined navigation system field. The invention particularly relates to the field of combined navigation which adopts a plurality of sensors and is used for an outdoor movable target. The combined navigation system mainly consists of a polarized light sensor, a GPS, a milemeter, a data collecting and message processing circuit and an information processing algorithm. A navigation processor consists of a core processor, an ROM, an RAM and a DSP; and the subsystem of the navigation processor processes the data output by the subsystem of the polarized light sensor, the subsystem of the GPS and the subsystem of the milemeter for information fusion and then outputs the position and navigation information of the outdoor movable target. The polarized light sensor of the invention only relies on the external and stable polarized light distribution mode, and the navigation information error does not increase alon