Global Navigation Satellite Systems Engineering, Policy, and Design
Paul Cruddace is the geodesy and positioning manager at Ordnance Survey, Great Britain’s national mapping agency.
He is responsible for the development and implementation of the overall strategy including the national GNSS infrastructure.
Cruddace is a chartered surveyor with a background in the use of precise GPS positioning to determine earthquake hazards.
By Inside GNSS
CORS and OPUS for Engineers
Edited by Tomás Soler
PUBLISHED BY THE AMERICAN SOCIETY OF CIVIL ENGINEERS
Trimble BD920Trimble has introduced two new GNSS OEM modules, the BD910 and BD920, featuring centimeter-level, real-time kinematic (RTK) positioning capabilities optimized for high-precision and control applications.
The BD910 and BD920 modules are designed to allow OEMs and system integrators to easily add centimeter-level positioning to specialized or custom hardware solutions.
By Inside GNSS
Do you use Topcon products in your daily life and work? If so, Topcon invites you to pick up your cell, your video camera or any other video recording device and show them what you do and how you do it.
Send in your two minute clip by October 1 – just point and shoot and upload, the company says.
By Inside GNSS
NovAtel OEM615 receiverNovAtel, Inc. has introduced the newest member of its OEM6 receiver family: the OEM615. Measuring only 46x71x11 millimeters (1.81×2.79×0.43 inches) and weighing 24 grams (0.84 ounces), the diminutive OEM615 provides precise positioning in a familiar, compact form factor.
By Inside GNSS
Q: What is a virtual reference station and how does it work?
A: To reach centimeter-level — or even better — accuracy of positioning typically requires use of precise dual-frequency carrier phase observations. Furthermore, these observations are usually processed using a differential GNSS (DGNSS) algorithm, such as real time kinematic (RTK) or post-processing (PP). Regardless of the specific differential algorithm, however, implicit in the process is an assumption that the quality of the reference station data is consistent with the desired level of positioning accuracy.
By Inside GNSS
Anechoic chamber test site at U.S. Naval Air Systems Command (NAVAIR) facility in Patuxent River, MarylandInterference can pose a threat to the reception of GNSS signals in a variety of ways. Even low-level signals have the potential to interfere with GNSS receivers, which require very high sensitivity for acceptable performance due to the extremely low received GPS signal power at the Earth’s surface.
By Inside GNSS
The report concerns economic effects on high precision commercial uses of GPS, such as precision agriculture. (U Calif. photo)Research released yesterday (June 22, 2011) indicates that interference from LightSquared cellular broadband transmitters could cost manufacturers and users of commercial GPS technology up to $96 billion in annual losses.
By Inside GNSS
LightSquared graphicWith test results and congressional sentiment running against it, LightSquared has received a two-week extension for filing its report and recommendations, due to the Federal Communications Commission (FCC) yesterday (June 15, 2011), on likely interference to the GPS L1 band.
Meanwhile, a congressional critic of LightSquared’s effort to roll out a 4G/LTE broadband cellular service adjacent to the GPS frequency has called on the agency to rescind its waiver of limits on the company’s plans to build a high-powered national network of terrestrial transmitters.
By Inside GNSS
Septentrio has announced plans to release the AsteRx-m, a low-power GPS/GLONASS dual-frequency RTK receiver that is smaller than a credit card.
The new board, which will begin shipping in the third quarter of 2011, is aimed specifically at integration in handheld devices, mobile computing platforms, and other solutions requiring high accuracy combined with low power in applications where space is at a premium. The new receiver covers the functionality range from GPS-L1 only to full GPS-GLONASS L1-L2
By Inside GNSS
Trimble announced Thursday (April 28, 2011) that its first-quarter 2011 revenue was up 20 percent at $384.3 million as compared to the first quarter of 2010.
Operating income grew 21 percent to $43.7 million compared to the year-earlier period. Operating margin in the first quarter of 2011 was 11.4 percent, approximately flat compared to the first quarter of 2010.
First quarter 2011 non-GAAP operating income of $70.1 million was up 23 percent; the non-GAAP operating margin was 18.2 percent.
By Inside GNSS
Continuing a series of acquisitions in recent years, Trimble announced today (April 19, 2011) that the Sunnyvale, California–based company has entered into a definitive agreement to acquire privately held Ashtech S.A.S.
In announcing the its plans, Trimble said that it expects the acquisition of the Carquefou, France, company and its affiliates will expand the U.S. company’s Spectra Precision portfolio of survey solutions and allow the company to better address emerging markets worldwide.
By Inside GNSS
