| Summary: | 碩士 === 國立臺灣科技大學 === 機械工程系 === 93 === Global Positioning System (GPS) has been wildly used in our daily life. However, the applications of indoor environments become very difficult due to the weak GPS signal strength, and multi path effect resulting from the obstruction of the buildings, etc. By using the re-radiated antenna, the GPS signals were introduced into indoor environments to realize the practicability of the indoor positioning in this thesis.
By using simple isolated advice, this research separates the satellites signals into two partitions. One of the two partitions was broadcasted through a re-radiated antenna, and the other partition was received by GPS receiver directly from the sky. Using the carrier phase double difference measurements, one can resolve the integer ambiguity and eliminate the receiver’s clock error and thus realize the indoor positioning system. Since the local coordinate of the experiment environment does not correspond to the ENU (East-North-Up) coordinate, the angle between the coordinate system is also resolved using outdoor carrier phase positioning technique. In indoor environments, the distance from the receiver to the re-radiated antenna is not as far as that from the receiver to satellite so that we can not consider it as infinite. The resulting nonlinearity in the equations was compensated by using Iteration Method. The RMS error of the algorithm using the Iteration Method was calculated to confirm that the method has better positioning precision.
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