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http://www.lboro.ac.uk/departments/cv/wedc/papers/21/groupd/ntale.pdf GLOBAL POSITIONING SYSTEM (GPS) is a fairly recent technology which uses orbiting satellites to calculate any position on earth. Though it was originally conceived primarily as a tool for military Navigation, GPS use has gradually spread to civilian applications ranging from air traffic management, general sea navigation to general surveying. If the district water officer has this data, as well as a GPS unit, scheduled maintenance visits may be paid to each water source to ascertain its condition as the point sources are easy to relocate. While placing the pegs for the tap stands, we ensured a distance of at least 300m between any two tap stands. du To investigate the effects of equatorial ionospheric scintillation on space based global navigation and communication, IPS Radio and Space Services and the Defence Science and Technology Organisation collaborated to obtain scintillation and dual frequency GPS measurements at Vanimo. An Ionospheric Scintillation Monitor (ISM) records S4 and other parameters every minute, while a dual frequency GPS receiver records the carrier-to-noise ratio, carrier phase and pseudorange data at 2-second intervals. The dual frequency GPS data were analysed to process rate of TEC (ROT), derivative of ROT (DROT) and their standard deviations (ROTI and DROTI). For an undisturbed ionosphere, dual frequency GPS receiver observations can show a flat total electron content (TEC) distribution within several minutes. gps Identify smokers Many people with schizophrenia smoke and smoke heavily, resulting in significant health and lifestyle problems. Smoking reduction and cessation is complicated because smoking may alleviate some of their psychiatric symptoms and lessen the side-effects of some antipsychotics. Assess readiness to quit (stage-of-change cycle) Motivation to quit can be increased by discussing the specific costs of smoking (such as health and lifestyle issues) for that person and the benefits of quitting, as well as acknowledging the difficulties associated with quitting. Recommend group support Involvement with a specialised group program (for example, a SANE SmokeFree Program) will increase reduction in smoking and quit rates, as well as assisting in maintenance of smoking cessation. acro An ANU academic has warned that Dr White said the rise in refer- in the same way that McDona'lds the Medicare system in Australia is rals had repercussions for the assesses the performance of its manbeing rorted through the large-scale Australian health care system and agers. ANU scientists will use a sensitive new testing procedure to determine whether mobile phone radiation causes harm too subtle to be detected by conventional techniques. There, in the first election of Fellows to the Binalong/Yass area led Bob and 1937, he married Mary Rogerson, a Australian Academy of Science Mary to a very active retirement Sydney botany/geology major, and (1954), as a Fellow of the Royal adjacent to the national capital. cb_217 As the cost of Global Positioning System (GPS) units decreases, more pilots are using these devices to supplement their other navigational equipment. I recently purchased a hand-held GPS, and was anxious to use my new acquisition. This is analogous to the 'OFF' flag showing on the VOR receiver when the aircraft is out of range for adequate signal acquisition. When properly programmed and used, GPS has incredibly accurate position reporting capability, which can prove to be a lifesaver---literally. The next reporter, the pilot of a long-range amphibious airplane on a ferry flight across the Pacific Ocean, tells a "GPS-to-the-rescue" story. gpsdata_6 Airbiquity's GPS Accessory1 is a breakthrough, first-to-market device that adds full GPS capabilities to your existing wireless phone. This GPS Accessory is designed to fit Nokia® brand 5100, 6100 and 7100 series wireless phones2, without modifications or upgrades to the existing phone. Independent of the wireless service providers, your customers can take advantage of location-based services today with the GPS Accessory. In short, if your customers can make a call, they can utilize this revolutionary technology. Equipping your phones with Airbiquity's GPS Accessory gives your wireless subscribers the safety, security and convenience of knowing exactly where they are, and the ability to communicate their location quickly and accurately. gps-pec Many different flight test techniques (FTT's) have been espoused that use the precise ground speed available from Global Positioning System (GPS) units to determine position error corrections (PEC) in new or modified aircraft. Unlike the traditional ground course, the heading must be directly into and away from the wind since the unknown wind velocity will result in a unknown drift angle and contribute to an unknown component of ground speed over and above the true airspeed. Calculating ground speed from the time and distance on each leg separately, the two ground speeds are averaged to negate the effect of wind. swv http://www.radiometrics.com/swv.pdf We demonstrate sensing of integrated slant-path water vapor (SWV) along ray paths between Global Positioning System (GPS) satellites and receivers. We use double differencing to remove GPS receiver and satellite clock errors and 85-cm diameter choke ring antennas to reduce ground-reflected multipath. Potential applications for SWV data include local and regional weather modeling and prediction, correction for slant wet delay effects in GPS surveying and orbit determination, and synthetic aperture radar (SAR) imaging. Rocken et al. [1991a] and Davis et al. [1993] found more than 20% azimuthal variation in radiometer measurements of integrated water vapor at 30 o elevation. Ray tracing through a two dimensional curved atmosphere including a 3% refractivity variation (upper panel) generates a ~3 mm SWV signal (lower panel). GIS-GPS Data Dictionary -- file used to store feature and attribute data Differential Correction -- a technique that uses additional GPS receivers coupled with specific calculations to increase the accuracy of GPS receivers. GPS -- (Global Positioning System) a satellite-based positioning system operated by the U.S. Department of Defense which consists of three components: space, control, & user PDOP -- (Positional Dilution of Precision) calculation that takes into account each satellite's position relative to the other satellites in the constellation. Best overall indicator of the degree of accuracy that can be expected. Step 1: At the office the user must first create a data dictionary with the help of Pathfinder Office, for this exercise we are not creating a data dictionary and are going to operate in non-feature Rover mode to simply collect point locations as we move (ignore 2nd, 3rd & 4th bullet unless using a data dictionary). agu97_bard http://perry.geo.berkeley.edu/~mhmurray/PDF/agu97_bard.pdf We are developing methods for rapidly measuring coseismic displacements using continuously operating, permanent Global Positioning System (GPS) networks, such as BARD, in order to determine finite-fault characteristics of earthquakes. The Bay Area Regional Deformation (BARD) network of permanently installed GPS stations continuously monitors crustal deformation in northern California, with a particular focus on the San Andreas fault system in the San Francsico Bay Area. The BARD network is a collaborative effort of UC Berkeley, the US Geological Survey, and several other university, government, and commercial institutions. 10 BARD stations are co-located with the seismic instrumentation of the Berkeley Digital Seismic Network (BDSN) and use digital frame relay connections for continuous telemetry to the Berkeley Seismological Laboratory. PacoimaGPS http://pasadena.wr.usgs.gov/scign/group/pacoima_dam/ION/PacoimaGPS.pdf Agencies responsible for dam safety have long used conventional surveying methods to measure the displacements of benchmarks as part of dam monitoring programs. Quantitative methods were assessed to allow the identification of a number of outlying data points that could be misinterpreted as GPS station motion in a real-time system. We have not yet found a satisfactory method for rigorous identification and removal of all outliers in the Pacoima Dam time series. This is justifiable because of the lower uncertainties associated with the short DAM1-DAM2 baseline, and because of the existence of higher than average systematic noise in the data recorded at CMP9. pap10 She has been involved with GPS research since 1984 and has published numerous papers on static and kinematic GPS positioning. His major area of interest currently includes high precision vehicle positioning and sensor integration for safety and convenience applications Mr. Christoper Wilson is a group manager for telematics and safety technology at DaimlerChrysler RTNA. The objective of this paper is to assess the accuracy and feasibility of such a system, which is based on the Honeywell HG-1700 IMU and the NovAtel OEM4 GPS receivers. To analyze the prediction accuracy of the INS, it is desirable to have a truth trajectory with which to compare. When the data is then processed with simulated GPS data gaps, the resulting trajectory will differ from the reference trajectory only during those times. | |
