Demonstration of the Analog Transmission of GPS Spread Spectrum Signals Over Fiber Optic Links
COLORADO UNIV AT BOULDER
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The measurement of the open ocean sea level will require the utilization of space geodetic techniques, especially the Global Positioning System, GPS. In order to meet the challenge of the sea level measurement, the orbits of the GPS satellites must be known to an on-orbit accuracy of less than 50 cm, about a factor of 20 to 50 times better than routinely available from U. S. Air Force sources. This need for highly accurate, reliable, and routinely available orbits motivated the development of a Fiber Optics GPS Orbit Network FOGON. The main idea of this system is to remote the GPS antennas at accurately known geodetic locations and transmit the GPS analog satellite signals along a phase stable fiber optic link to the GPS receiver which synchronizes the data acquisition of the network. This paper presents the results of a hardware demonstration carried out by members of the Colorado Center for Astrodynamics Research CCAR and the Optoelectronic Computing Systems Center OCSC at the University of Colorado CU which demonstrates that the analog transmission of GPS spread spectrum signals over a 4 km fiber optic link is possible with minimal degradation to GPS receiver operation.
- Physical and Dynamic Oceanography
- Space Navigation and Guidance
- Unmanned Spacecraft
- Spacecraft Trajectories and Reentry