OBJECTIVE To examine the reproducibility, responsiveness and concurrent validity of the six-minute walk test (6MWT) when tested outdoors in patients' own neighbourhoods using a global positioning system (GPS) or a measuring wheel. METHODS A total of 27 chronic stroke patients, discharged to their own homes, were tested twice, within 5 consecutive days. The 6MWT was conducted using a GPS and a...

NAVSYS High Gain Advanced GPS Receiver (HAGR) uses a digital beam-steering antenna array to provide additional gain in the direction of the GPS satellite signals. This increases the received signal/noise ratio on the satellites tracked and also improves the accuracy of the pseudo-range and carrier-phase observations. The directivity of the digital beams created from the antenna array also reduc...

In this paper a practical method for tropospheric effects on GPS derived coordinates in absolute mode is presented. GPS observations at the permanent GPS stations can be used as source of information for the modeling. The developed model is a time-dependent model and as such differs from usual tropospheric models, which are based on atmospheric parameters, i.e. temperature, pressure and humidit...

A pseudolite is used as a GPS backup system, and is also used for the purpose of indoor navigation and correction information transmission. It is installed on the ground, and transmits signals that are similar to those of a GPS satellite. In addition, in recent years, studies on the improvement of positioning accuracy using the pseudorange measurement of a pseudolite have been performed. As for...

This paper presents a design for a transmitting antenna array comprised of mobile antenna elements, where the Global Positioning System (GPS) is used to estimate the current location and velocity of those elements. GPS is also used to synchronize the clocks carried by the mobiles. With this information, a central algorithm can control the phase of the radio signal radiated from each element so ...

The security and reliability of GPS receivers are critical to Phasor Measurement Units (PMUs). These devices provide synchronized voltage and current phasor measurements in power systems based on GPS timing. However, due to the unencrypted nature and low received signal to noise ratio of civil GPS signals, jamming and spoofing attacks on GPS receivers can pose a risk to both the position and ti...

The low energy virtual Compton scattering process eN → eNγ offers a new and potentially high resolution window on nucleon structure via measurement of so-called generalized polarizabilities (GPs). We present calculations of GPs within heavy baryon chiral perturbation theory and discuss present experimental efforts.

GPS (Global Positioning System) has a variety of applications among which real-time tracking finds significance in day-to-day life. GPS tracking is defined as the measurement of object position and orientation in a given coordinate system using GPS data at different points of time. GPS data are collected from GPS receivers attached to the moving objects and these data are used for tracking obje...

Key words: pedestrian navigation, high sensitivity GPS Using long total dwell times, acquisition and weak GPS signal tracking in degraded signal environments are possible. A technology utilizing such long integration methods is called High Sensitivity GPS (HSGPS). A previous hardware in-the-loop GPS signal simulator test has demonstrated that, for a stand-alone HSGPS implementation provided by ...

PURPOSE This study was performed to describe and evaluate the management of male lower urinary tract symptoms (LUTS) suggestive of benign prostatic hyperplasia (BPH) by general practitioners (GPs) in Jakarta. METHODS This observational cross-sectional study was peformed between January 2013 and August 2013 in Jakarta. We developed a questionnaire consisting of 10 questions describing the mana...