Impact of January 2016 GPS UTC Anomaly By Charles Curry / Presented at ION ITM, January 2017 On Jan. 26, 2016 alarms occurred on GPS timing receivers around the globe. This article tells the story as experienced by the Chronos support team over a four-day period, dealing with nearly 5,000 alarm events from many different GPS timing receivers worldwide. It... read more
OEM High-Frequency TCXOs Ultra stable for low jitter and phase noise applications The RHT1490 series of high-frequency and low-jitter ultra-stable TCXOs are available in frequencies from 50 MHz to 204.8 MHz. It delivers telecommunications-grade stability with a low real mean squared (rms) phase jitter of <200 fs (12 kHz–20 MHz). The platform’s frequency output enables lower system jitter, allowing communication... read more
Navmar Applied Sciences Corp. (NASC) and UAV Turbines Inc. (UAVT) have announced plans for a joint flight demonstration of NASC’s TigerShark aircraft with a UAVT micro-turboprop propulsion system. First flights are scheduled before the end of the year. This will mark the first time that a Group 3 UAV (medium endurance and size) is powered by a micro-turboprop engine with... read more
Precision on Board
Described are the results of realistic simulations carried out to precisely position a low-Earth-orbit satellite using a source of real-time GPS corrections actually transmitted by a network of geostationary satellites. Even accounting for data outages, 3D positioning accuracies better than a decimeter have been obtained. Precision on board? Not right now but likely coming real soon. read more
At 25 years old, GPS Satellite Vehicle No. 27 completed its time in orbit on April 18. With the satellite’s final duty completed, the 2nd Space Operations Squadron (2 SOPS) said goodbye via final command and disposal from Schriever Air Force Base in Colorado. SVN 27 was launched in 1992, meaning it performed more than triple its design life of 7.5... read more
Topcon Positioning Group has launched two new full constellation GNSS receivers for the original equipment manufacturer (OEM) market. The new B111 and B125 boards are designed for use with a broad range of positioning applications. The boards utilize the GPS, GLONASS, BeiDou and Galileo constellations with the B111 tracking signals in the L1 and L2 frequency band, while the B125... read more
French space agency CNES has made available two applications on the Google Play store for Android apps. Both are compatible with Android N (Nougat). RTCM Converter: This app aims to convert the smartphone GNSS raw measurements to Radio Technical Commission for Maritime Services (RTCM message type 1077) and send them to a caster, for use by third-party software. PPP WizzLite: This app... read more
Skydel, a GNSS test solutions company, has partnered with Germany-based Noffz to deliver SDX GNSS simulation to clients in Europe. Noffz creates test systems and solutions in the area of the Internet of Things (IoT) — especially in automotive RF-test applications around eCall, network access devices, telematics control units, infotainment/multimedia units and automotive radar. With nearly 30 years of experience, Noffz... read more
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