receiver

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
Geneq Announced Dual-Frequency RTK GPS, OmniSTAR HP Receivers
April 12, 2011

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
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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
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
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
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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
GNSS Inside Mobile Phones

GNSS Inside Mobile Phones

Figure 1 & Table 1

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

Recent years have seen GPS receivers built in as a standard feature in many consumer products. A growing number of mobile phones, personal navigation devices, netbooks and tablets are equipped with GPS receiver chips and navigation software that enable consumers to navigate from A to B or find their nearest coffee shop. According to Berg Insight, annual shipments of GPS-equipped mobile phones are estimated to reach 960 million devices in 2014.

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By Inside GNSS
European Union GNSS Receiver Workshop
March 12, 2011

European Union GNSS Receiver Workshop

The Geospatial Building at the University of Nottingham

A two-day workshop on GNSS receivers will take place at the Geospatial Building at the University of Nottingham Innovation Park on April 14 and 15, 2011.

In addition to talks by GNSS experts, the workshop features product demonstrations, using the test facilitiies at GRACE, the GNSS Research and Applications Center of Excellence. These include GPS and Galileo full constellation Spirent simulator, signal record and replay devices and the roof-based fixed test track designed for dynamic research and testing.

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By Inside GNSS
European Union GNSS Receiver Workshop 2011
March 11, 2011

European Union GNSS Receiver Workshop 2011

The 2011 EU GNSS Receiver Workshop will take place at the University of Nottingham’s Geospatial Building on April 14 and 15.

In addition to talks, the event features project demonstrations that make use of the GNSS Research and Applications Center of Excellence (GRACE) test facilities. These include a GPS and Galileo full constellation Spirent simulator, signal record and replay devices and the roof-based fixed test track designed for dynamic research and testing.

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By Inside GNSS
Possible Compass Signal Specifications.jpg
March 2, 2011

Beihang Authors Suggest TMBOC Design for China’s Compass B1 Civil Signal

Despite the fact that China’s rapidly developing global navigation satellite system now has seven spacecraft in orbit intermittently broadcasting test signals, it is the only GNSS provider that has not yet published a draft version of its interface control document (ICD), although one has reportedly been completed for more than a year.

Against that background, any new source of information about the directions of the Compass design — official, semi-official, or other — draws special attention.

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By Inside GNSS
FCC Campaign Goes After GPS and Cell Phone Jammers
February 17, 2011

FCC Campaign Goes After GPS and Cell Phone Jammers

Website at http://www.jammer-store.com/gps-blockers-jammers.html

The  Enforcement Bureau of the U.S. Federal Communications Commission has announced new efforts to clamp down on the marketing, sale, and use of illegal cell phone and GPS jamming devices.

On February 9, the Bureau released two enforcement advisories and a downloadable poster on cell phone and GPS jamming that warn consumers, manufacturers, and retailers (including online and Web-only companies) that the marketing, sale, or use of such jamming devices is illegal.

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By Inside GNSS
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