Abstract: A wireless ranging system employs interference tolerance parameters in to reduce the effects of wireless interference on device performance (e.g. power consumption). As part of a wireless ranging session, each device identifies one or more wireless ranging parameters that indicate one or more limits (e.g. time limits, sample limits, and the like) corresponding to different portions of the ranging session. In response to a limit indicated by the interference tolerance parameters being reached prior to completion of the wireless ranging session, the wireless ranging system can take remedial action.

Abstract: A wireless ranging system generates, at a first device, a first plurality of counts, each of the first plurality of counts indicative of a transmit time of a corresponding packet, and further generates a second plurality of counts, each of the second plurality of counts indicative of a receive time of a corresponding packet. In response to a number of samples of the first plurality of counts exceeding a threshold, the system generates a plurality of timestamps based on the first plurality of counts and the second plurality of counts and generates a plurality of time-of-flight values based on the plurality of timestamps. Based on a combination of the plurality of the time-of-flight values, the wireless ranging system generates an effective time-of-flight value and identifies a distance between the first device and as second device based on the effective time-of-flight value.

Abstract: A method of performing a frequency scan at a radio includes placing the radio in an active mode and, while maintaining the radio in the active mode, for each of a plurality of target frequencies determining a coarse frequency tuning value based on the target frequency. The radio places a phase locked loop (PLL) in an open-loop configuration and while the PLL is in the open-loop configuration, programs the VCO with the coarse frequency tuning value. The radio programs the divider with a feedback adjustment based on the target frequency, places the PLL in a closed-loop configuration, and in response to the PLL reaching a settled state, performs an operation based on an output signal of the PLL.

Abstract: A wireless ranging system generates, at a first device, a first plurality of counts, each of the first plurality of counts indicative of a transmit time of a corresponding packet, and further generates a second plurality of counts, each of the second plurality of counts indicative of a receive time of a corresponding packet. In response to a number of samples of the first plurality of counts exceeding a threshold, the system generates a plurality of timestamps based on the first plurality of counts and the second plurality of counts and generates a plurality of time-of-flight values based on the plurality of timestamps. Based on a combination of the plurality of the time-of-flight values, the wireless ranging system generates an effective time-of-flight value and identifies a distance between the first device and as second device based on the effective time-of-flight value.

Abstract: A method of performing a frequency scan at a radio includes placing the radio in an active mode and, while maintaining the radio in the active mode, for each of a plurality of target frequencies determining a coarse frequency tuning value based on the target frequency. The radio places a phase locked loop (PLL) in an open-loop configuration and while the PLL is in the open-loop configuration, programs the VCO with the coarse frequency tuning value. The radio programs the divider with a feedback adjustment based on the target frequency, places the PLL in a closed-loop configuration, and in response to the PLL reaching a settled state, performs an operation based on an output signal of the PLL.