Design & Test

Second Russian SBAS Satellite Prepared for Launch

August 1, 2012By

News courtesy of CANSPACE Listserv. Luch-5B, the second of a set of three geostationary satellites being launched to reactivate Roscosmos’s Luch Multifunctional Space Relay System, has been delivered to the Baikonur Cosmodrome. It arrived together with the Yamal-300K satellite in a single shipping container aboard an Antanov An-124-100 Ruslan flight from Krasnoyarsk. This marked the first time that Information Satellite... read more

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New Version of NMEA 0183 Released

July 20, 2012By

The National Marine Electronics Association (NMEA) has released a significantly updated version of NMEA 0183, its well-known standard that enables the interfacing of marine electronics, reports the Martime Executive. Version 4.10 will improve boating safety and navigation through updates and expansions of various electronic communications “sentences” pertaining to a number of navigation and communications devices, including Galileo satellite receivers and Automatic Identification Systems (AIS). read more

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First Positioning Results Using Galileo Announced

July 17, 2012By

A team of Canadian and German researchers have obtained precise three-dimensional positions using measurements from the four prototype Galileo satellites now in orbit. The two In-Orbit Validation (IOV) satellites launched in October 2011 joined the two Galileo In-Orbit Validation Element (GIOVE) satellites launched in 2005 and 2008, forming a mini-constellation. For a few hours on certain days, signals from all... read more

SSTL Signs €80M Contract with OHB for Second Batch of Galileo Payloads

July 11, 2012By

Surrey Satellite Technology Ltd (SSTL) Director of Telecommunications & Navigation, John Paffett, has today signed a contract with Ingo Engeln, member of the Executive Board of OHB System AG at the Farnborough International Airshow, for the construction of a further eight navigation payloads for the European Galileo programme. read more

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NOAA Planning Changes to Space Weather Alerts

July 11, 2012By

The National Oceanic and Atmospheric Administration (NOAA) announced that effective Wednesday, July 25, 2012, at 1600 UTC (10:00 AM MDT), the Space Weather Prediction Center (SWPC) will modernize its geomagnetic storm watch products. read more

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Navilock Offers New u-blox-Based GLONASS Receivers

July 6, 2012By

Navilock, a trademark of Tragant Handels- und Beteiligungs GmbH, announces a new family of GLONASS receiver products including the NL-662U USB based receiver (pictured left), equipped with a u-blox GLONASS chipset. read more

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UPDATE: Launch of EGNOS Satellite Delayed until Monday

July 2, 2012By

Roscosmos has done some juggling of launch dates for some upcoming satellite launches from the Baikonur Cosmodrome and the launch of SES-5 is now scheduled for Saturday, July 7. The launch of SES-5 from the Baikonur Cosmodrome, originally scheduled for June 18, was delayed due to a problem with a first stage subsystem on the Proton launch vehicle. read more

Innovation: The Devil Is in the Details

July 1, 2012By
FIGURE 4. A CPSE observed on SVN48 (PRN07) on September 15, 2010, at 19:21:42 GPS Time. (Click to enlarge.)

Looking Closely at Received GPS Carrier Phase
The stability of a received GPS signal determines how well the receiver can track the signal and the accuracy of the positioning results it provides. While the satellites use a very stable oscillator and modulation system to generate their signals, just how stable are the resulting phase-modulated carriers? In particular, do received signals always conform to the published system specifications? In this month’s column we take a look at a specially designed receiver for analyzing GPS carrier phase and some of the interesting results that have been obtained. read more

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