Science Daily  November 16, 2022 The vulnerabilities of Global navigation satellite systems (GNSS) combined with the lack of a back-up system pose a severe risk to GNSS-dependent technologies. Researchers in the Netherlands used optical and wireless transmission schemes similar to those encountered in mobile communication networks, and exploiting spectrally efficient virtual wideband signals. The detrimental effects of multipath propagation were mitigated, thus enabling robust decimetre-level positioning and subnanosecond timing in a multipath-prone outdoor environment. They demonstrated that their system is independent of GNSS and offers superior performance through a constellation of radio transmitters, connected and time-synchronized at the subnanosecond level […]