Multiantenna GPS-Over-Fiber System for Attitude Determination Using Phase-Derived Range Measurement

A multiantenna global positioning system over fiber (GPS-over-fiber) system with real-time line bias monitoring is proposed for attitude determination of vehicles. In the proposed system, GPS signal transmission from multiple antennas to the receiver is achieved via radio-over-fiber links. A phase-derived range measurement scheme is applied to monitor the line bias variation between different optical fibers. Then the carrier phase single difference (SD) model, instead of the carrier phase double difference (DD) model, is used to improve the pitch and roll precision of the GPS-based attitude determination system. Experimental results show that the precision of the pitch and roll is improved by over three times compared with the conventional DD model while the precision of the heading is not reduced.