scope:

This part of the standard defines the air-interface for RTLS systems using a physical layer UWB signalling mechanism (based on standard IEEE 802.15.4a UWB). This modulation scheme employs high rate pulse repetition frequencies (PRF) 16 MHz or 64 MHz, and a combination of burst position modulation (BPM) and binary phase-shift keying (BPSK) giving an extremely high level of performance with a fully coherent receiver. In addition to defining the air interface protocol (AIP) in terms of the physical layer modulation, this part of the standard also defines the AIP in terms of the messages sent over the air. This AIP supports simple one-way communication of a basic blink that may be used for a one-way Time Difference of Arrival (TDOA) based Real Time Locating System (RTLS), where mobile tags periodically transmit the blink message which is received by an infrastructure consisting of a number of fixed reader nodes. This AIP also optionally supports bidirectional communication and two-way ranging between the readers and tags of a Real Time Locating System (RTLS). The support of two-way ranging depends on additionally including a UWB receiver in the tag and UWB transmitters in the reader infrastructure. The mandatory default operational mode ensures interoperability between tags and infrastructure from various manufacturers, while the availability of several options offers flexibility to the developer of the infrastructure to adapt the behaviour of the overall system to the specific needs of his application.