GPS L-Band Threatened

The L-band, in which the GPS/GNSS L-1 signal also resides, might soon be overcrowded in several US densely populated areas. LightSquared (a mobile-satellite service operater (MSS) and Ancillary Terrestrial Component (ATC) license holder) is seeking a reallocation of its L-band from a space service to primarily a terrestrial wireless service. Lightsquared would like to provide primarily voice and data broadband services on the L-band frequencies they currently hold a license for. This change in usage of the bandwidth together with a densely populated powerful (1500W) transmitter network could mean that the GPS/GNSS L-1 signals are negatively influenced. This could potentially... (read more)
2011-01-18 02:29:01

New GPS Satellite Operational

The fourth in a series of eight modernized Global Positioning System (GPS) satellites that will deliver new capabilities to military and civilian users has been declared fully operational.   Launched from Cape Canaveral October 17, the satellite was given the all clear after an on-orbit checkout by a combined U.S. Air Force/Lockheed Martin team. Read more   The satellite joins three IIR-M satellites and 12 other operational Block IIR satellites within the current 28-spacecraft constellation. The fifth GPS IIR-M satellite is scheduled for launch on 20th December 20, 2007 from Cape Canaveral.     (read more)
2007-11-08 10:32:43

Hemisphere GPS Introduces Crescent VS100 Series GPS Compass

Hemisphere GPS has introduced the new Crescent VS100 and VS110, a heading and positioning solution for machine control and marine navigation applications including dredging and hydrographic surveying. Hemisphere GPS's Crescent VS100 Series GPS Compass delivers the performance necessary to replace traditional gyrocompasses and other precision heading sensors at a fraction of the cost. Hemisphere GPS' Crescent Receiver Technology supports two separate antenna inputs. Crescent VS100 computes and outputs heading and either pitch or roll angles by processing the data between the two antennas using a single GPS receiver. The receiver features status lights with a menu and display system simplifying... (read more)
2007-05-01 12:00:00

Hemisphere GPS Awarded Two New GPS Technology Patents

Hemisphere GPS (Canada) has been awarded two new patents for innovative technology.The Method and System for Synchronizing Multiple Tracking Devices for a Geo-Location System patent (U.S. Patent No. 7,292,186) enables more robust and cost effective heading by using a single processor to compute heading from multiple GPS receivers. Hemisphere GPS's Attitude Determination Exploiting Geometry Constraints patent (U.S. Patent No. 7,292,185) increases the speed and reliability of Real-Time Kinematic (RTK) solutions for multiple antennas at known distances from each other.  The entire system can be moving or stationary while computing the RTK solutions.   Hemisphere GPS customers are already reaping the... (read more)
2007-11-28 12:17:23

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

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

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

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

High-performance Modular GPS Receiver

Trimble introduced the Trimble DSM 232 Receiver, a high-performance GPS receiver capable of sub-meter, decimeter and centimeter accuracy for both harbor and waterway applications and for system integrators. The modular receiver is designed for dynamic, real-time positioning operations on water, such as waterway dredging where it is integrated as the positioning sensor component. The GPS receiver is easily upgraded to increase performance as positioning requirements change. For waterway and harbor applications, the Trimble DSM 232 GPS receiver allows operators to save time and reduce operational costs. Setup time is greatly reduced as well as cost of ownership because the operator... (read more)
2006-04-06 12:00:00
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