| 摘要 |
A GPS-inertial system that is suited to new installations as well as the retrofitting of GPS receivers includes inertial sensors that are incorporated into the housing of the GPS antenna. The outputs of the inertial sensors are modulated onto a radio frequency carrier that has the same frequency as the GPS carrier, using the same data modulation arrangement as that used by the GPS system. The inertial measurements are thus sent to the receiver on the same cable as the RF signals from the antenna, and the receiver recovers the data from the sensor signals with the same arrangement that is used for data recovery from GPS position signals. Consequently, software modifications of existing GPS receivers can provide position and velocity estimates generated from the outputs of the inertial sensors.
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