Design & Test

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

This article is tagged with , , , and posted in Design & Test, GNSS

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

This article is tagged with , and posted in Design & Test, GNSS

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

This article is tagged with , , and posted in Design & Test

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

This article is tagged with , and posted in Design & Test, From the Magazine, Innovation

Letter to the Editor: Automatic Gain Control, Spoofing

July 1, 2012By

Just for the record: what is reported in “Detecting False Signals With Automatic Gain Control” (April GPS World) is what we introduced a long time ago and is reflected in one of our videos, and implemented in all of our GNSS receivers. AGC information is one of the four ways, and the least significant way, that we show interferences. There is a big difference between showing something in the laboratory and in some receivers, compared with having technology in mass production that everyone can understand and use. — Javad Ashjaee read more

This article is tagged with , , , and posted in Design & Test, Opinions

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 Design & Test, Featured Stories, GNSS