A system and method for one-way ranging is disclosed. The system comprises a transmitter, also referred to as a tag, transmitting a first frequency in a first frequency group. The receiver, also referred to as the locator, receives the first frequency and measures the phase at a first point in time. At a later time, the transmitter switches to a second frequency, which is close in frequency to the first frequency so as to also be part of the first frequency group. The receiver also switches to the second frequency. The receiver then measures the phase of the second frequency at a second point in time. The transmitter and receiver then repeat this sequence for a second frequency group. The four phase measurements are used to determine the distance from the transmitter to the receiver. In this way, improved accuracy may be achieved by having a large separation between the first frequency group and the second frequency group.