Synchronization-Free and Low Power TDOA for Radio Based Indoor Positioning

n this paper, we propose a method to calculate time difference of arrival values between a signal source and several transceivers without the need to synchronize any clocks. The method is allowing the signal source to operate on very low power because it does not need to receive but only has to send short pulses. We derive this new method from an existing protocol, called Whistle, and show how our improvements reduce its error to make the method suitable for radio-based applications. We present a theoretical analysis as well as simulations and first results of an implementation.