Satelles had demonstrated in 2016 sub-microsecond timing using its Satellite Time & Location (STL) service with a stand-alone TCXO-based receiver. The service uses a signal from the Iridium low-Earth orbit (LEO) constellation. Now the company has released from new tests using configurations with a differential source and with a more accurate OCXO clock, producing timing accuracy of 160 nanoseconds. Gregory Gutt,... read more
FleetUp Trace is a ruggedized tablet designed for fleet drivers required to display Records of Duty Status (RODS) upon request instead of printing out hard copies with the new Electronic Logging Device (ELD) mandate. Tim provides thoughts on the product hardware, ease-of-use and various app features. By Tim Spence Sometimes, there is great anticipation when buying a new electronic gadget. The... read more
China continues to update the BeiDou navigation satellite system. On Feb. 12, two more navigation and positioning satellites were launched into medium Earth orbits, following the successful launch of a pair of BeiDou satellites on Jan. 11. A Long March 3B rocket with a Yuanzheng-1 upper stage lifted off from the Xichang Satellite Launch Center, Sichuan Province, at 13:03 local... read more
By Yongqiang Wang and Aranya Chakrabortty, Clemson University / IEEE Power and Energy Society General Meeting, September 2017 Phasor Measurement Units (PMU) are playing an increasingly important role in wide-area monitoring and control of power systems. PMUs allow synchronous real-time measurements of voltage, phase angle and frequency from multiple remote locations in the grid, enabled by their ability to align... read more
Modules featuring Altair’s ALT1250 CAT-M1/NB1 chipset will be demonstrated at Mobile World Congress. Altair Semiconductor, a provider of LTE chipsets, has selected Rohde & Schwarz as its partner for test equipment for its dual-mode CAT-M1/NB1 internet of things (IoT) ALT1250 chipset, as well as its next-generation IoT chipsets. The ALT1250 is a highly integrated dual-mode CAT-M1/NB-IoT chipset with GNSS. Modules... read more
Two methods of spoofer detection, the identification and sourcing of false GNSS signals, have been released by Javad GNSS, using features available for all of its OEM GNSS boards. Spoofer detection and alarm. This feature then identifies and isolates the spoofer signal, ignores it, and provides a position solution using only valid satellite signals. Determination of the direction from which... read more
While in orbit, the Deep Space Atomic Clock (DSAC) mission will use the navigation signals from GPS coupled with precise knowledge of GPS satellite orbits and clocks to confirm DSAC’s performance. News from the Jet Propulsion Laboratory, NASA In deep space, accurate timekeeping is vital to navigation, but many spacecraft lack precise timepieces on board. For 20 years, NASA’s Jet... read more
The U.S. Air Force plans to release a request for proposal (RFP) for the second phase of GPS III Follow-On satellite production “on or about” Feb. 13, according to a report by Inside Defense. The RFP was expected in December 2017, but was held up as officials worked to solidify requirements. The solicitation is expected to result in a contract... read more
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