Abstract: A Method provides GPS signals to high altitude such as geostationary earth orbit GPS users. A GPS signal Generator system (10), GPS satellite position (20), designated High altitude GPS user locations (30), a GPS broadcast antenna control system (40), an antenna control mechanism (50), earth pointing GPS signal broadcast antenna (60) and high altitude GPS broadcast antenna/antennas (65) are integrated to provide GPS signals to designated high altitude locations.

Abstract: Transfer/in-flight alignment technique using a Doppler velocity sensor. An aircraft navigation system (10 and/or 20), a Doppler velocity sensor (50) and an alignment filter (45) are used to align the inertial navigation system (4) of a slave vehicle. The velocity (and/or position) of the aircraft navigation system, the velocity (and/or position) of the slave vehicle's inertial navigation system (40) and the velocity measurement of a Doppler velocity sensor (50) are used to generate the measurements of the alignment filter (45). The DVS and aircraft navigation system are used simultaneously to align the inertial navigation system of the slave vehicle. A GPS receiver (60) with a GPS antenna (70), a Doppler velocity sensor (50) and an alignment filer (46) are used to align the inertial navigation system (40) of a flight vehicle.