Abstract: A ranging beacon system to measure the performance of a running athlete can include a ranging base and a wearable device. The ranging base can be placed along an exercise path with line of sight to an athlete and can include a ranging base ultra-wideband (UWB) transceiver. The ranging base UWB transceiver can receive a first UWB signal and transmit a second UWB signal. The wearable device can be worn by the athlete and the wearable device can include a wearable device UWB transceiver, and a processor. The wearable device UWB transceiver can transmit the first UWB signal and receive the second UWB signal. The processor can generate ranging data of the athlete based on the first and the second UWB signals.