Uplink null data packet format for passive location

A non-transitory computer-readable medium storing computer-executable instructions which when executed by one or more processors result in performing operations comprising:

• causing to send a trigger frame that solicits poll response to one or more anchor stations involved in a passive ranging measurement;
• identifying one or more polling response frames received from the one or more anchor stations;
• causing to send a trigger frame that solicits uplink null data packet (NDP) to one or more anchor stations, wherein the uplink NDP comprises an indication of an high efficiency (HE) single user (SU) frame type;
• and
• identifying one or more uplink NDPs received from the one or more anchor stations.

A method comprising:

• causing to send a trigger frame that solicits poll response to one or more anchor stations involved in a ranging determination;
• identifying one or more polling response frames received from the one or more anchor stations;
• causing to send a trigger frame that solicits uplink null data packet (NDP) to one or more anchor stations, wherein the uplink NDP comprises an indication of a high efficiency (HE) single user (SU) frame type;
• and
• identifying one or more uplink NDPs received from the one or more anchor stations.