GNSS (all systems) Archives - Page 139 of 153 - Inside GNSS - Global Navigation Satellite Systems Engineering, Policy, and Design

GNSS (all systems)

Keeping the Spoofs Out
April 18, 2011

Keeping the Spoofs Out

The demand for techniques capable of authenticating the GNSS signals and detecting simulation attacks (spoofing) has increased exponentially in the last years, mainly targeted to financial and safety critical applications.

Associated proposals and developments addressing these issues focused on two different approaches: user segment authentication services that leveraged existing services in order to detect signal spoofing and that integrated signal authentication services into the GNSS system itself.

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By Inside GNSS
NavCom Introduces Multi-GNSS SF-3040 Receiver
April 12, 2011

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
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ICL-GNSS 2011: Localization and GNSS Conference
April 7, 2011

ICL-GNSS 2011: Localization and GNSS Conference

The 2011 International Conference on Localisation and GNSS will take place on June 29 and 30 in the city of Tampere, Finland at Tampere Hall, the largest conference and concert center in Scandanavia. 

ICL-GNSS 2011 will address the latest research on satellite-based positioning techniques to provide reliable and accurate position information with low latency. The emphasis is on the design of mass-market and professional GNSS receivers and related tools and methodologies.

Topics include:

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By Inside GNSS
NovAtel Announces FlexPak6 Enclosure Featuring OEM6 GNSS Technology
March 18, 2011

NovAtel Announces FlexPak6 Enclosure Featuring OEM6 GNSS Technology

NovAtel FlexPak6

NovAtel Inc. has announced the launch of  its FlexPak6 GNSS enclosure, the first product to house the company’s new OEM628 multi-constellation receiver.

According to the Calgary, Alberta, Canada–based company, the 120-channel FlexPak6 is designed for easy integration into new user equipment and is capable of tracking all current and upcoming GNSS satellite signals, including GPS L1/L2/L2C/L5 (code and carrier phase), GLONASS L1/L2, Galileo E1/E5a/E5b/Alt-BOC, Compass/BeiDou-2 and satellite-based augmentation systems.

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By Inside GNSS
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Trimble to Acquire Fugro’s OmniSTAR DGPS Service

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
GNSS Receiver Clocks
March 14, 2011

GNSS Receiver Clocks

Q: Does the magnitude of the GNSS receiver clock offset matter?

A: It is well known that GNSS receiver clocks drift relative to the stable atomic time scale that ultimately defines a particular GNSS system in the first place. GNSS receiver manufacturers, however, try to limit the magnitude of the time offset to within some predefined range.

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By Inside GNSS
Integer Aperture Estimation

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
Coherent Integration Time Limits

Coherent Integration Time Limits

Equation: signal variance for a “ring of scatterers” model

Indoor GNSS propagation environments are characterized by multiple reflected signal paths (multipath) terminating at the receiver. Consequently, the received signal’s amplitude, phase, and perceived angle of arrival attributes vary randomly as the receiver moves. This has created significant interest among receiver designers and manufacturers to develop powerful processing for GNSS handsets such that these can operate effectively in indoor faded environments.

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By Inside GNSS
The Civilian Battlefield

The Civilian Battlefield

Figures 1 & 2

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

Growing dependence on GNSS for positioning, navigation, and timing (PNT) has raised a parallel concern about the potential risks of signal interference. The popular press has recently highlighted accounts of car thieves using GPS jammers, solar flares pumping out L-band radiation, and faulty television sets causing havoc to GPS receivers across an entire harbor.

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By Inside GNSS
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