Patent ID: 8791861
Filing Date: 2014-07-29
Classification: G01C,G01S,H04H

Abstract:
1. A method of determining the position of a mobile device, comprising: receiving at the mobile device a plurality of Automatic Dependent Surveillance-Broadcast (ADS-B) messages from a respective plurality of mobile reference devices, each of the ADS-B messages being broadcast beginning at one of a plurality of ADS-B message start opportunity (MSO) times having known timings relative to a reference time, wherein each of the ADS-B messages contains position information for the mobile reference device transmitting the message and a MSO value indicating the MSO time at which transmission of the message started; determining a time of reception of each of the ADS-B messages received at the mobile device; using the MSO value to determine the time of transmission of each of the ADS-B messages received at the mobile device; and determining a position of the mobile device via multi-lateration based on the time of transmission and the time of reception of the ADS-B messages and the position information for the mobile reference devices.