Patent ID: 9140777
Filing Date: 2015-09-22
Classification: G01S

Abstract:
1. A system for ultrasonic locationing of a mobile device within an environment, the system comprising: a plurality of fixed ultrasonic emitters within the environment, the emitters operable to transmit an instruction to listen for an enrollment tone to at least one communication device located within the environment, and to sequentially emit the enrollment tone from each emitter in the environment at specific times to be received by those communication devices that implement the instruction; a controller coupled to the emitters, the controller operable to receive a response from each of those communication devices that implemented the instruction and received the enrollment tone, the respective response including an identity of the communication device, a time that the enrollment tone was received, and an indication of a hardware platform of the communication device, the controller also operable to assign a locationing mode to each responding communication device in accordance with the hardware platform of the respective communication device; and at least one communication device operable to provide locationing information using its assigned locationing mode and locationing tones from active emitters.