| Summary: | 碩士 === 國立臺灣海洋大學 === 電機工程學系 === 98 === Nowadays, the prevailing GPS technology has been widely used in a variety of fields such as electrical consumer products, telematics and military implementation. The modern GPS system is capable of receiving signals from at least three satellites simultaneously and regardless of the receiver’s location, a fast and accurate position determination of the receiver can be achieved with ease. However, GPS signal is easily affected by external factors such as weather and terrain. The effect can be critical especially in urban area, tunnel, underground car park and the confined space within a factory, where these adverse environments can result in a poor GPS signal or sometime no signal at all.
Therefore, a mean to provide uninterrupted positioning services has
been a crucial issue when it comes to navigation technology. This thesis
aims at the study of enabling the navigation system to operate normally
under any circumstances and providing reliable information on position.
In this study, a microcontroller was connected to the OBDII interface
scanner to gain more related data such as vehicle speed and etc. from the
vehicle’s computer. The system also detects the voltage change as a result
of the angular rotation of the gyroscope device and simultaneously
receiving the GPS signals. The information were then be processed by the
Extended Kalman Filter techniques to calibrate the error of the gyroscope. In time of the absence of signals, a scheme of positioning estimation with
the aid of empirical Dead Reckoning (DR) system can be implemented to
facilitate a continuous, uninterrupted positioning service.
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