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In this paper, we propose an accurate and real-time positioning method for intelligent road vehicles in urban environments. The proposed method uses a robust lane marking detection algorithm, as well as an efficient shape registration algorithm between the detected lane markings and a GPS based road shape prior, to improve the robustness and accuracy of global localization of a road vehicle. We exploit...
Seamless positioning is one of the goals for positioning technology. In all the related positioning systems, confidence parameters are needed, to support the location information fusion process in seamless positioning. Compared to the major positioning systems, positioning accuracy estimation parameter is absent in fingerprint positioning system. This hinders the fingerprint positioning system from...
This paper studies the algorithms for determining a BDS satellite's velocity using the broadcast ephemeri. Firstly, by taking the time derivatives of the Kepler orbit elements and the correction terms, the algorithm comprises close-form analysis formulas and the processing steps for directly computing a BDS satellite's instant velocity using the broadcast ephemeris is derived, and its validity is...
This paper describes new concepts and techniques for an indoor positioning system that uses near-ultrasonic sound from a smartphone. The indoor positioning system can be used in many practical applications, for example, in detecting the location of moving objects, such as a person or a wheelchair, and navigation within a wide indoor area. Indoor positioning systems seem to require a higher positioning...
In order to enable Location Based Service (LBS) closed environment, many technologies have been investigated to replace the Global Positioning System (GPS) in the localization process in these indoor environments. WLAN occurs as the most suitable and powerful technology for Indoor Positioning System (IPS) due to its widespread and low cost. WLAN received signal strength (RSS) fingerprinting can be...
Citizens of any country face civic problems in their day to day lives. They resort to the one of the several ways provided by the government to file their complaints. With advancements in technology, the complaint registration systems have evolved in different ways to simplify the task of registering as well as addressing the complaints. This research paper presents the architecture of a GPS based...
In this paper, an algorithm is proposed to provide position data of vehicles with high accuracy and low cost. It is to use same number of satellites or same satellites number, then calculates absolute coordination of vehicles using distance between vehicles. Finally it can enhance accuracy of relative positioning in vehicles.
Sensing technologies have made the tracking of users' daily trajectories a common service, such as location based service, children/elders tracking service, etc. This information can also be analyzed to discover some interesting and meaningful information about users. In this paper, we study the Routine Based Classification (RBC) approach for classifying users into different groups. For comparing...
In this paper, we propose an energy-efficient adaptive location middleware based on GPS as well as embedded sensors including an accelerometer and a geomagnetic sensor for smart mobiles. Smart mobiles provide Network-based or GPS-based locations for various applications. Network-based location does not have high accuracy but its level of energy consumption is low. In contrast, GPS-based location has...
Localization errors can play an important role in measurements of radio propagation or spectrum utilization, especially in urban environment where GPS localization accuracy is highly varying. In this paper we present a low cost and simple method for mitigating the impact of localization errors, based on multiple GPS receivers. The presented results are based primarily on performance evaluation of...
Pedestrian dead reckoning is a method of localization that uses inertial sensors to estimate the travelled distance from the previous position. This method can estimate the position when GPS or WiFi is not available such as indoor. However, pedestrian dead reckoning is subject to cumulative errors. In this paper, we exploit the fact that most of lights are located regularly in indoor environments...
This paper presents a novel cooperative positioning (CP) method to increase localization accuracy in vehicular ad-hoc networks (VANET). The proposed method uses a semi-extended Kalman filter to fuse position data and distance information of nodes in the network. This paper also introduces a new distance measurement method using the time-difference-of-arrival in positive orthogonal codes. Simulation...
Safety applications have been popular research topics in recent years, such as forward collision warning, emergency electronic brake lights and intersection collision warning. The basic safety message is used to broadcast from each car that transmits the position, car speed and car heading information. Neighbourhood cars receiving this information can decide on the danger or not in the next second...
The geometry dilution of precision (GDOP) has been widely used as an accuracy metric for GNSS. The conventional GDOP, mainly investigated for single GNSS, is not valid for multi-GNSS because of the system time offset among GNSSs. This paper performs a GDOP analysis for two scenarios where the system time offset is resolved respectively at system level and at user level in presence of any number of...
Each year, the number of stolen vehicle is on the rise. Usually, to prevent theft, a physical type countermeasure is used such as padlock, disk break lock and other more which is a preventive action but it is not enough safe. The objective of this study is to create a controllable system that can display the location of a vehicle using Global position system (GPS) to pin point the location and Global...
As the car number of Beijing break through five million, the mode share of public transportation sector is not large enough to ease congestion. To attract more people, the public transit should provide high quality service to the public. One way to achieve this is by developing intelligent transportation systems application to provide accurate bus arrival time prediction. Bus arrival time prediction...
Localization of nodes is a very crucial issue in many wireless sensor network (WSN) applications. In this paper, we consider a WSN initially consisting of a single location-aware mobile anchor nodes and a number of location-unaware, stationary nodes, and propose two algorithms to localize the unknown nodes using the mobile anchor nodes. We can obtain the location information of the unknown nodes through...
Location has become a key service for smartphone applications. With the help of inertial navigation unit integrated into smartphones, such as accelerometer and compass, we can provide reliable and accurate localization service, which overcomes huge energy consumption of GPS and rough location accuracy of systems based on GSM or Wi-Fi. In this paper, we present a reliable and energy-efficient localization...
Received signal strength (RSS) metric has been attracting a lot of interest in localization in wireless systems since it is available by default. However, this metric is affected by a shadowing phenomenon that highly degrades the localization accuracy. In this paper, we show that the RSS can be exploited for performing a clustering operation and finding the groups of geographically nearby mobile terminals...
The aim of this study was to investigate the use of a logistic model to determine the growth properties of Eichhornia crassipes (EC), in particular the area of EC. The area of EC was measured using Alos satellite images and GPS. The measurements were shown to lead to an accurate area-related logistic model of EC. This indicates that there is a possibility of obtaining the growth area of EC from a...
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