Global Navigation Satellite Systems Engineering, Policy, and Design
Global Navigation Satellite Systems Engineering, Policy, and Design
FIGURE 1: Characterization of interference from the user perspectiveIncreasing 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.
By Inside GNSS
Francine Vannicola, Naval Research LaboratoryAs 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.
By Inside GNSS
UrsaNav LF transmitter site for timing synchronization trialsVirginia-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.
By Inside GNSS
OPERA neutrino detector in Gran Sasso, Italy. INFN photoNo 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.
By Inside GNSS
Bliley GMX1001Bliley 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.
By Inside GNSS
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.
By Inside GNSS
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.
By Inside GNSS
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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Brad AndersonRosum Corporation, the Mountain View, California–based supplier of timing and positioning technology that combines GPS and broadcast television signals, has named Brad Anderson as the company’s new chief executive officer.
By Inside GNSS
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.
By Inside GNSS
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.
By Glen Gibbons
A recently announced partnership between GNSS technology innovator NovAtel, Inc., and Brilliant Telecommunications underscores the profound changes taking place in the precise timing markets.
By Glen Gibbons
