The invention provides a mobile terminal positioning method, an acoustic positioning
transmitter-
receiver, a mobile terminal and a mobile terminal
positioning system. At least three acoustic positioning
transmitter-receivers with synchronized networks and different frequencies are arranged at a certain positioning region, and acoustic signals are synchronously transmitted to the mobile terminal by all the acoustic positioning
transmitter-receivers through
network time synchronization; after the mobile terminal enters the positioning region, the acoustic signals of the at least three acoustic positioning transmitter-receivers are received, and each acoustic positioning transmitter-
receiver is identified from the received acoustic signals and corresponding data flows are acquired; a
signal transmission time difference between each two acoustic positioning transmitter-receivers is acquired from the data flows; and TDOA (
Time Difference of Arrival) calculation is carried out according the position of each acoustic positioning transmitter-
receiver and the
transmission time difference between each two acoustic positioning transmitter-receivers so as to determine the position of the mobile terminal in the positioning region. According to the technical scheme provided by the invention, the positioning cost of the positioning region is reduced and the positioning precision and reliability of the mobile terminal are improved.