Timing

Symmetricom Introduces Small Cells Category to SyncWorld Ecosystem Program

November 14, 2012By

Symmetricom, Inc., today launched a new small cells-focused category within its SyncWorld Ecosystem Program. Developed to support the integration with Symmetricom’s SCr/SCe NTP/ PTP and sGPS SoftClocks and interoperability between Symmetricom Grandmaster clocks and other small cells solutions, the category aims to facilitate validated deployments of timing and synchronization with various small cells products in 3G and 4G/LTE architectures. Current... read more

This article is tagged with and posted in Timing, Wireless Infrastructure

Symmetricom Launches RoHS Compliant GPS Time Servers

October 5, 2012By
Symmetricom SyncServer S200 Enterprise Class GPS Network Time Server.

Symmetricom, Inc., has introduced new RoHS compliant versions of its existing SyncServer S200 and SyncServer S250 GPS Network Time Servers. Designed for large or expanding IT enterprises, the cost-effective SyncServer S200 and S250 with optional rubidium-based atomic clocks will reliably continue operational service for extended periods when primary time sources are impaired. Accurate network time-keeping is essential for modern data... read more

This article is tagged with and posted in Timing

Expert Advice: PNT for the Nation

October 1, 2012By

Three Key Attributes and Nine Druthers By Brad Parkinson. Position, navigation, and time (PNT) are essential enablers for warfighter capabilities. They are used in virtually every weapons system of the Department of Defense. The GPS system has become the ubiquitous provider of this military service. In addition, GPS is the backbone of scores of civil applications that have provided startling... read more

Going Up Against Time: The Power Grid’s Vulnerability to GPS Spoofing Attacks

August 1, 2012By
Figure 7. Oscilloscope and Synchrowave screen at about 870 seconds, point 4 in Figure 3.

Spoofing tests against phasor measurement units demonstrate their vulnerability to attack. A generator trip in an automatic control scheme could be falsely activated by the GPS spoofing, possibly leading to cascading faults and a large-scale power blackout. read more

This article is tagged with , , and posted in Timing, Wireless Infrastructure

Reminder: Leap Second This Weekend

June 29, 2012By

News courtesy of CANSPACE Listserv. Likely none of us needs a reminder as the upcoming leap second has been all over the news outlets for the past few days. But just to provide the details again, read this article. Presumably, all GPS receiver manufacturers have checked to make sure their receivers will handle the leap second properly. However, at least... read more

This article is tagged with , and posted in Featured Stories, Signal Processing, Timing

UrsaNav Testing Wide-Area Timing Alternative

March 5, 2012By

As a result of a Cooperative Research and Development Agreement (CRADA) between the U.S. Coast Guard and UrsaNav, Inc., on-air tests are being conducted from the former Loran Support Unit site in New Jersey. One of the CRADA’s goals is to research, evaluate, and document a wireless technical approach as an alternative to GPS for providing precise time. The ability... read more

Higher Timing Accuracy, Lower Cost

November 1, 2009By
AURORA BOREALIS seen from Churchill, Manitoba, Canada. Ionospheric scintillation research can benefit from this new method.

Inside a typical GNSS receiver, the estimate of the error in the local oscillator is formed as a component of the navigation solution, which is in turn based on the output of each satellite-tracking channel propagating its estimate of carrier and code measurements to a common future point. But this method limits the resolution with which the noise of the local oscillator can be quantified. To bypass this shortcoming requires a method of coherently gathering information about the phase change in the local oscillator across all available satellite signals: to use the same samples simultaneously for all satellites in view to estimate the center-point phase error common across the visible constellation. We explore how. read more

This article is tagged with and posted in Receiver Design, Simulators & Tools, Timing