Description: 342 communications: directive radio wave systems and devices (e.g., radar, radio navigation) / 342 communications: directive radio wave systems and devices (e.g., radar, radio navigation)/(350) directive (352) including a satellite (357.2) with position, velocity, or attitude determination (ipc) (357.21) determining a navigation solution using signals transmitted by a satellite radio beacon positioning system (357.22) satellite radio beacon positioning system transmitting time-stamped messages; e.g., gps [global positioning system], glonass [global orbiting navigation satellite system] or galileo (ipc) (357.25) determining position (ipc) (357.33) whereby the position solution is constrained to lie upon a particular curve or surface; e.g., for locomotives on railway tracks (ipc)
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