Floating car data (FCD) recorded with the Global Positioning System (GPS) are an important data source for traffic research. However, FCD are subject to error, which can relate either to the accuracy of the recordings (measurement error) or to the temporal rate at which the data are sampled (interpolation error). Both errors affect movement parameters derived from the FCD, such as speed or dire...

The availability of two GNSS (Global Navigation Satellite System), GPS and Galileo, will offer in future new possibilities to provide integrity and reliability information to the user both at signal and user levels due to increased redundancy. User-level reliability monitoring schemes, namely Receiver Autonomous Integrity Monitoring (RAIM), consist of statistically testing leastsquares residual...

In this paper, a robust heading determination method is proposed for low-cost attitude and reference system (AHRS) aided by the global positioning (GPS). As compared with traditional GPS/SINS-integrated navigation-based method, in information obtained from GPS velocity outputs first incorporated into observation vector, which constructs novel completed GPS/SINS integration framework greatly imp...

BACKGROUND We recently showed that abdominal obesity measurements (waist and hip circumference, waist-to-hip ratio) were inaccurate when performed by general practitioners (GPs). We hypothesise that measurement error could be even higher in overweight and obese patients due to difficulty in locating anatomical landmarks. We aimed to estimate GPs' measurement error of general (weight, height and...

in this research, four different positioning methods were compared in order to evaluate their accuracy, using a remotely controlled robot on a specific route. these methods included: using a single gps module, combining the data from three gps modules, using an inertial measurement unit (imu), and gps/imu data fusion. the comparison of these four methods showed that gps/imu data fusion along wi...

In this paper, a newly-developed direct georeferencing system for the guidance, navigation and control of lightweight unmanned aerial vehicles (UAVs), having a weight limit of 5 kg and a size limit of 1.5 m, and for UAV-based surveying and remote sensing applications is presented. The system is intended to provide highly accurate positions and attitudes (better than 5 cm and 0.5°) in real time,...

Automotive manufacturers are researching forward collision warning systems (FCWS) to reduce the occurrence of rear-end collision accidents between vehicles. Traditionally these systems use forward scanning sensor technology such as RADAR or LIDAR to measure the distance between the equipped vehicle and other vehicles/obstacles ahead. The U.S. Army is using such technology on their ground vehicl...

A Small Autonomous Underwater Vehicle Nnavigation System (SANS) is being developed at the Naval Postgraduate School. The SANS is an integrated Global Positioning System/Inertial Navigation System (GPS/INS) navigation system composed of low-cost and small-size components. It is designed to demonstrate the feasibility of using a low-cost strap-down inertial measurement unit (IMU) to navigate betw...

Overhead conductor sag may be measured by different methods. In the paper measurement of sag of 66KV power transmission line under shut down conditions at no wind load using standard handheld GPS receiver BT 359 has done. The real time direct measurement of overhead conductor sag is needed for the operation of power transmission system. The measurement of conductor tension, temperature and ambi...