Positioning method and device based on SIB1

The invention relates to an aircraft self-positioning method and device based on SIB1, belongs to the field of wireless communication, and solves the problem that a flight path cannot be accurately determined when an aircraft starts a passive receiving mode under the condition of GPS blocking, and the method is executed by the aircraft and comprises the following steps: receiving an LTE downlink signal to obtain a first receiving sequence of the LTE downlink signal; performing timing synchronization on the first receiving sequence to obtain a synchronous receiving sequence and receiving time delay; obtaining SIB1 of an LTE downlink signal base station based on the synchronization sequence; determining the position of an LTE downlink signal base station according to the SIB1; determining the distance between the aircraft and the LTE downlink signal base station according to the receiving time delay; and determining the position of the aircraft according to the position and the distance of the LTE downlink sign