Simpson Paper Makes Case for Terrestrial PNT

Former FCC Public Safety Bureau Chief David Simpson stresses the importance of finding a terrestrial alternative to GPS for positioning, navigation and timing (PNT) in a new paper. “A day without accurate and available PNT services is a scenario the U.S. cannot afford,” Simpson argues. The paper comes amid broad opposition to NextNav’s pursuit of an NPRM examining using the 902-928 MHz band for PNT (see 2409060046). Terrestrial PNT “utilizes ground-based infrastructure, making it less susceptible to jamming and spoofing attacks targeting space-based systems” and combined with GPS would “create a more robust and resilient PNT ecosystem, minimizing the impact of single-point failures,” said Simpson, also a former Navy rear admiral, now a professor at Virginia Tech. A terrestrial system would “eliminate the confusion GPS receivers often encounter in urban canyons, difficult geographies and indoors” and “eliminate the asymmetric advantage an adversary might seek from an attack on our space assets.” The paper was prepared in part with the support of NextNav but reflects his personal views, Simpson said.