Disclosed herein are embodiments of a balloon-based positioning system and method. In one example embodiment, a system includes at least three balloons, with each balloon including a position-determining module (PDM) and a position-broadcasting module (PBM). Each PDM is configured for determining a position of the respective balloon and each PBM is configured for broadcasting a balloon signal containing balloon-positioning data of the respective balloon. The balloon-positioning data includes the determined position of the respective balloon and a corresponding time of broadcast.