Information technology. Real-time locating systems (RTLS). Part 22. Direct Sequence Spread Spectrum (DSSS) 2,4 GHz air interface protocol: Transmitters operating with multiple spread codes and employing a QPSK data encoding and Walsh offset QPSK (WOQPSK) spreading scheme
State system for ensuring the traceability of measurements. Multifunctional information measuring systems for mines and underground digging safety. Dust and gas measuring heads for mine air. Verification procedure