Precise RTK GPS Water Levels

Incline plane models in geoid-ellipsoid separation calibration
As more people adopt RTK GPS technology for measuring water levels, the issue of ellipsoid-geoid separation is increasingly being discussed. This article outlines various projects undertaken to calibrate this separation, and presents information to consider when using RTK GPS for measuring relative to an orthometric (geoid) datum. RTK GPS is increasingly being used for measuring water-level corrections during hydrographic survey, as for water levels in general. Measuring this third vertical dimension usually requires local site calibration to correct for separation between WGS84 ellipsoidal height and geoidal elevation, enabling conversion of WGS84 heights to orthometric heights such as mean seal level... (read more)
2008-01-01 01:00:00

Next Generation of GPS Receivers

NovAtel Inc. has introduced OEMV, its next generation of GPS receivers. The OEMV family of receivers supports modernised GPS frequencies and signals, and incorporates NovAtel's new Vision Correlator, a technology that virtually eliminates multipath errors. The OEMV receivers incorporate new high-fidelity Radio Frequency (RF) designs and a highly integrated System-on-Chip digital ASIC. The OEMV receivers feature a fully integrated Satellite-Based Augmentation System (SBAS), Omnistar and Canada-wide Differential GPS (CDGPS); faster processing speed and improved memory for expanded Application Programming Interface (API); 100-Hz measurements; and lower power consumption. The first single-, dual-, and triple-frequency models will be available to customers at... (read more)
2005-12-01 12:00:00

C-Nav1010 GPS Receiver

The C-Nav GPS Division of C & C Technologies has released the C-Nav1010, a new GPS receiver that uses the C-Nav Global Satellite GPS Correction Service. The new receiver provides sub-metre performance by tightly integrating precise point positioning (PPP) correction data with single-frequency GPS measurements.   The new C-Nav1010 is unique because it contains an L1 GPS package. Users who can accept a reasonable compromise in accuracy are rewarded with a substantial reduction in hardware cost.   The standard C-Nav1010 system comprises a high-sensitivity single-frequency (L1) GPS receiver integrated with a L-Band demodulator operating on a single antenna. The custom-built... (read more)
2008-01-04 09:20:27

Hemisphere R220 GPS Receiver

Hemisphere GPS has introduced the R220 GPS Receiver. It is the first finished product to be powered by Eclipse, Hemisphere GPS’ patented dual frequency technology. The R220 GPS Receiver provides extremely accurate, versatile, and robust positioning, in virtually any environment, anywhere in the world. The R220 GPS Receiver is created for professional mapping, guidance, machine control, and navigation applications. According to Steven Koles, President and CEO of Hemisphere GPS, no other traditional dual-frequency RTK systems can compare to the value offered by our R220 Receivers.   The R220 GPS Receiver features RTK (Real Time Kinematic) for fast, reliable, long range... (read more)
2008-09-17 01:32:55

SAM GPS-DGPS Navigation Sensors

SAM Electronics of Hamburg has introduced two new high-precision R4 GPS and Differential GPS sensors designed for worldwide navigation aboard vessels of all types and sizes as well as support of hydrographic surveying operations. Both IMO-compliant units are EC Wheelmark and USCG type-approved. Featuring two interface channels with an extensive range of optional settings, the fully ruggedised, compact systems comprising easily installed small receiver and antenna facilities can be used either for centralised navigation of small boats or as a key component for larger vessel navaid assemblies, including integrated bridge configurations. Suitable also for retrofit applications, both are readily upgradable... (read more)
2007-01-08 09:56:53

ACSA Underwater GPS to Track Neutrinos

After relocating early in January 2004, the Sharm-El-Sheikh airplane black boxes in 1000 m of water depth, ACSA Underwater GPS goes deeper. The Italian Institute For Nuclear Physics, INFN, has ordered a set of synchronous beacons that will be laid in 3000 m to position an unlimited number of neutrinos detection spheres. The spheres will be occupying a cube having one kilometer in all dimensions. The system composed of seabed synchronous beacons and acoustic digital receivers mounted inside the glass spheres will offer a submetric accuracy . Delivery of the system will take place in 2005. For this application, ACSA... (read more)
2004-12-16 12:00:00

Veritas DGC Selects C-Nav GPS

The C-Nav GPS Division of C & C Technologies was recently awarded a contract to install C-Nav Worldwide DGPS on all seven seismic vessels operated by Veritas DGC. For redundancy, Veritas DGC has chosen to input two totally independent DGPS systems into their integrated navigation system. The integrated navigation system will weigh each solution equally to produce a combination position. However, if one of the systems is performing outside preset parameters it is eliminated from the solution. This technique allows for Veritas to have a true fully redundant position system. (read more)
2006-05-19 12:00:00

Northstar Professional GPS/DGPS MX-500

The Northstar MX-500 GPS/DGPS display for the professional market has a built-in LAN interface that can hook up totally 4 control units, chart systems, conning display and network PC. The MX-500 is equipped with a built-in USB-plug in the front that facilitates coping, in and out, waypoints and routes, and make a back-up file of own data and settings. Compared to former models the software has been improved with an advanced function for monitoring the receiver quality, 'Receiver Autonomous Integrity Monitoring' (R.A.I.M.). Every satellite is being quality tested before they are included in the position calculation. Display and antennas have... (read more)
2006-10-23 12:00:00

GPS-Synchronised, Solar-Powered Marine Lights

Carmanah Technologies Inc. has released the new 700 Series solar-powered lights, originally designed and built under contract with the U.S. Coast Guard. They were the first solar-powered lanterns using LEDs to be used in the U.S. Navigational Aid System. Models 701-GPS and 702-GPS are the only fully-integrated, three (3) nautical mile marine lights that can be Global Positioning Satellite (GPS) synchronized. Using an integrated GPS receiver, any number of 700 Series GPS lights can now be set to flash in perfect unison. For years, the 700 series lights have been used to mark navigation buoys, port and harbor entrances and... (read more)
2004-07-02 12:00:00

NavCom GPS Supported by FieldWorks Software

NavCom Technology, Inc. high-precision StarFire and Real Time Kinematic (RTK) GPS receivers are now fully supported by XYZworks FieldWorks field data collection software. StarFire receivers provide the decimeter accuracy of the satellite-based StarFire GPS augmentation network on a world-wide basis, without the need for local base stations. FieldWorks data collection software operates on PocketPCs using the Windows CE operating system, an easy-to-learn and use program that integrates with PocketCAD and is loaded with features for land surveying and construction applications. (read more)
2003-10-25 12:00:00
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