Survey and Mapping

GPS Interference Testing
July 1, 2011

GPS Interference Testing

Anechoic chamber test site at U.S. Naval Air Systems Command (NAVAIR) facility in Patuxent River, Maryland

Interference 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.

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By Inside GNSS
LightSquared Gets Two-Week Extension on GPS Interference Report; Congressman Calls on FCC to Rescind Waiver
June 15, 2011

LightSquared Gets Two-Week Extension on GPS Interference Report; Congressman Calls on FCC to Rescind Waiver

LightSquared graphic

With 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.

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By Inside GNSS
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Septentrio Announces AsteRx-m ‘Ultra-Compact’ GPS/GLONASS RTK Receiver
May 24, 2011

Septentrio Announces AsteRx-m ‘Ultra-Compact’ GPS/GLONASS RTK Receiver

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

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By Inside GNSS
Trimble Q1 Report: Revenue Up 20 Percent
April 29, 2011

Trimble Q1 Report: Revenue Up 20 Percent

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.

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By Inside GNSS
Trimble Announces Plans to Buy Ashtech
April 19, 2011

Trimble Announces Plans to Buy Ashtech

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.  

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By Inside GNSS
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Geneq Announced Dual-Frequency RTK GPS, OmniSTAR HP Receivers

Geneq Announced Dual-Frequency RTK GPS, OmniSTAR HP Receivers

Geneq SXBlue IIIL

Geneq Inc., a Montreal, Quebec, Canada, manufacturer, has introduced two new GPS products.

The SXBlue III-L is a compact GPS L1/L2 receiver in the world designed for use with OmniSTAR’s HP service to attain decimeter accuracy worldwide. Targeted at GIS mapping/surveying applications, the receiver measures 14 x 8 x 5.6 centimeters (5.57 x 3.15 x 2.22 inches) and weighs 517 grams (1.14 pounds) including battery.

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By Inside GNSS
NavCom Introduces Multi-GNSS SF-3040 Receiver

NavCom Introduces Multi-GNSS SF-3040 Receiver

NavCom Technology’s SF-3040 Receiver

NavCom Technology, Inc., has launched its 66-channel, SF-3040 pole-mount receiver, featuring StarFire/real-time kinematic (RTK) multi-GNSS capabilities and optimized for surveying and mapping applications.

NavCom says its new product provides real-time kinematic (RTK)–level accuracy up to 40 kilometers away from the base station or decimeter-level accuracy anywhere in the world when using the company’s StarFire global satellite-based augmentation system (GSBAS).

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By Inside GNSS
Trimble to Acquire Fugro’s OmniSTAR DGPS Service
March 16, 2011

Trimble to Acquire Fugro’s OmniSTAR DGPS Service

Omnistar DGPS world map

Trimble announced on March 16 that it has entered into a definitive agreement to acquire certain assets related to the OmniSTAR GNSS signal corrections business from Fugro N.V.

The acquisition is expected to significantly expand Trimble’s worldwide ability to provide correction services for a broad range of land-based applications in addition to OmniSTAR’s current focus in agriculture. Fugro’s offshore marine business is unaffected.

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By Inside GNSS
Integer Aperture Estimation
March 14, 2011

Integer Aperture Estimation

For the complete story, including figures, graphs, and images, please download the PDF of the article, above.

Integer carrier-phase ambiguity resolution is the key to fast and high-precision GNSS positioning and navigation. It is the process of resolving the unknown cycle ambiguities of the carrier-phase data as integers. Once this has been done successfully, the very precise carrier-phase data will act as pseudorange data, thus making very precise positioning and navigation possible.

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By Inside GNSS
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