January 23, 2013

Developing a GNSS Position and Timing Authentication Testbed

FIGURE 1: Characterization of interference from the user perspective

Increasing demand for ensuring the authenticity of satellite signals and position/velocity/time (PVT) calculations raises the need for tools capable of assessing and testing innovative solutions for verifying GNSS signals and PVT. Today’s civilian systems do not provide authentication at the system level, and a number of mitigation strategies have been developed in the last 10 years at user segment in order to protect receivers from interference and deception.

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By Inside GNSS
November 14, 2012

GNSS Positioning and Precise Timing

Francine Vannicola, Naval Research Laboratory

As the forthcoming “Time and Navigation” opening next March at the Smithsonian National Air and Space Museum reminds us, modern navigation depends profoundly upon time — the more precise, accurate, and stable a navigation system’s timing is, the more precise, accurate, and stable its positioning capability.

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By Inside GNSS
March 26, 2012

UrsaNav Tests eLoran, LF Timing Potential

UrsaNav LF transmitter site for timing synchronization trials

Virginia-based engineering firm UrsaNav Inc. has begun transmitting a variety of low frequency (LF) test signals, including enhanced Loran (eLORAN), as part of a cooperative research and development agreement (CRADA) with the U.S. Coast Guard (USCG).

The test program include a comprehensive palette of signals that are being evaluated for their ability to provide a robust, wide-area, wireless precise timing alternative that can operate cooperatively with GNSS technology or autonomously during GNSS unavailability.

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By Inside GNSS
November 17, 2011

GPS Timing Used in Experiment to Measure ‘Faster Than Light’ Particles

OPERA neutrino detector in Gran Sasso, Italy. INFN photo

No sooner had GPS positioning helped validate key aspects of Einstein’s general theory of relativity in the Gravity Probe-B program than GPS timing has been cited as helping bring his special theory of relativity into doubt.

At issue is the so-called OPERA (Oscillation Project with Emulsion-tRacking Apparatus) experiment, inaugurated in 2006 with the main goal of studying the rare transformation (oscillation) of muon neutrinos into tau neutrinos.

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By Inside GNSS
June 9, 2011

Bliley Launches New GPS Frequency and Timing Modules

Bliley GMX1001

Bliley Technologies, Inc., has unveiled two GPS frequency and timing modules at the 2011 IEEE MTT-S International Microwave Symposium taking place this week (June 5–10, 2011) in Baltimore, Maryland.

The company’s GMX1001 and GMM1002 modules launch a new product line for the company — introducing the first in a series of next-generation technologies for the Erie, Pennsylvania–based company.

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By Inside GNSS
March 21, 2011

Obama: The Trifecta of Bad Timing on Technology Policies

Talk about your bad timing.

The outcome of the LightSquared/GPS controversy threatens to make President Obama a three-time loser in technology policy matters.

In March 2010, his administration proposed to open for drilling for oil and natural gas extensive expanses along the Atlantic coast, in the eastern Gulf of Mexico, and off the north coast of Alaska, many of those areas for the first time. Less than a month later the Deepwater Horizon oil well explosion unleashed the largest accidental marine oil spill in the history of the petroleum industry.

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By Inside GNSS
January 18, 2011

Symmetricom Launches CSAC Product for Precise Timing and Synchronization

After eight years of successful participation in the Defense Advanced Research Projects Agency (DARPA) chip scale atomic clock (CSAC) initiative, Symmetricom, Inc., announced today (January 18, 2011) the general availability of what it says is the world’s smallest, lowest power atomic oscillator: a 16 cubic-centimeter unit weighing less than 35 grams (about 1.25 ounces) and operating on only 115 milliwatts of 3.3 VDC power.

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By Inside GNSS
October 23, 2009

Timing on the Fly

Sensor fusion is a predominant feature of modern navigation systems. To integrate navigation systems with other sensors, the spatial and temporal relationship of the sensor systems must be defined and calibrated.

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April 14, 2009

Trimble’s Tiny Timing Receiver

Trimble has introduced the postage stamp–sized Resolution SMT, a 12-channel parallel tracking, embeddable GPS receiver in a surface mount packaged designed to provide precise GPS or UTC time and synchronization for many static timing applications.

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By Inside GNSS
October 28, 2008

GPS/Galileo/GLONASS timing antenna

PCTEL offers the GPSL1GL-TMG-40N timing reference antenna specifically designed for deployments in congested cell-site applications and able to receive signals from GPS, Galileo, and GLONASS satellites in the 1575.42 ± 10 MHz and 1602-1615 MHz frequency bands. The low-noise, high-gain amplifier is well suited to address attenuation issues associated with applications requiring longer cable runs. The proprietary quadrifiliar helix design, coupled with multistage filtering improves out-of-band rejection and lower elevation pattern performance.

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By glen