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Autonomous vehicles require accurate position at all times in different environments at an affordable price. This accurate position can only be achieved when combining multiple positioning methods. One of these methods is presented in this paper: positioning based on a Global Navigation Satellite System (GNSS) to obtain absolute position. This solution should be at an affordable price with sub-meter...
Location-Based Services (LBS) and Intelligent Transportation Systems (ITS) demand positioning accuracy and availability requirements. In urban canyons, Global Navigation Satellite Systems (GNSS) suffer from signal blockage, jamming , severe multipath and low Carrier-to-Noise (C/No) ratio which degrade location accuracy and availability. Therefore, applications solely relying on GNSS have limited performance...
This paper presents a method to enhance digital OSM maps with roads inclination automatically. It relies on GPS data collected from two receivers. These data are fused with existing road map data by implementing the unscented Kalman filtering in a centralized scheme. We modeled the map data as a sensor that allows to account for its errors and uncertainties. The core of our method relies on a probabilistic...
The paper gives an overview of non-linear least square method, and presents GPS satellite pseudorange observation equations, which are usually over-determined because there are only 4 unknowns but normally more than 4 satellites being tracked, resulting in more than 4 pseudorange observation equations. Non-linear least squares(NLS) algorithm to solve pseudorange observation equations in order to find...
A high accuracy guidance system is important for many applications such as precision agriculture. The current RTK-GPS has accurate in unit centimeter but has high cost and using high frequency signal to transmit between GPS devices and reference devices requires the permission from The National Telecommunications Commission (NTC) in Thailand. A regular GPS receiver has lower cost but has accuracy...
The basic principle of attitude determination by multi-antenna GPS technology is discussed and the algorithm model is established. According to the problems in the applications, the RAIM algorithm is used in the GPS attitude determination. The performance of this system is improved in this paper. The test result and the accuracy analysis have demonstrated that the new method used in attitude determination...
The underwater target localization problem is one important application for underwater acoustic sensor networks. This paper, based on "underwater acoustic transmission theory", solves the target localization problem. The proposed algorithm firstly studies the principle of underwater acoustics and applies it to set up the model of underwater signal energy transmission. According to the model,...
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