Before revision: PNT technologies of interest encompass navigation satellite systems (both global and regional); inertial navigation electro-optical systems including LiDAR and imaging sensors; and radio-frequency ranging and timing systems, including those using signals of opportunity from communication systems and other non-traditional PNT sources.
After revision: ,PNT technologies of interest encompass navigation satellite systems (both global and regional); inertial navigation electro-optical systems including LiDAR and imaging sensors; and radio-frequency ranging and timing systems, including those using signals of opportunity from communication systems and other non-traditional PNT sources.