| 摘要 |
An accurate and constantly updated heading reference is provided for moveable vehicles, particularly aircraft. The heading is calculated from four velocity measurements, two of which are obtained from signals received from orbiting satellites, and two from on-board equipment which determines the vehicle's along-track and cross-track velocities. The on-board equipment may be a Doppler ground-speed sensor or an inertial velocity sensor using accelerometers, the outputs of which are integrated.
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