"The Federal Radionavigational Plan (FRP) is the official source of radionavigational policy and planning for the Federal Government, as directed by the National Defense Authorization Ave for Fiscal Year 1998. [...] The FRP includes an introduction, and sections on policies, operating plans, and research and development and will permit more efficient and response updates of policy and planning information. The companion document entitled, Federal Radionavigation Systems (FRS) includes government roles and responsibilities, user requirements, and system descriptions. The FRS is periodically updated as necessary."
National Space-Based Positioning, Navigation, and Timing (PNT) Executive Committee: http://pnt.gov/