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A single GPS antenna installation can only return a position and velocity between positions. However, with mulitple antennas, and receivers (3 minimum) 3-D attitude information soley from GPS can be solved. Typical installations have the antennas seperated as much as possible, such as on two wingtips and the vertical tail. Depending on the GPS units used (CA code only, DGPS with RTCM corrections, or a full real-time survey solution such as real-time kinematic) pitch, roll and heading can be determined between 0.5 degrees and a couple of degrees. A better solution for determining pitch and roll is a Intertial Gyro insturment such as an IMU which is closely coupled with GPS to achieve roll, pitch and heading to less than 20 arc seconds. I use such a system to position aerial photography aircraft, and we are resloving position to 5 centimeters, and pitch, roll and heading to 10 to 20 arc second accuracies. Given enough money and technology, anything is possible.
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Scooter
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Fly Safe, always make round trips!
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