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, Signal Processing

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 Opinions, Simulators & Tools

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

The Patent Brouhaha

June 28, 2012By

Two British technologists backed by the U.K. Ministry of Defense have filed patents on the future interoperable GPS and Galileo signal designs that severely disrupt modernization plans for both systems and suddenly, unexpectedly place receiver manufacturers in a highly uncertain and unfavorable situation. Some of the patents have been granted in the U.K. and in Europe, and applications are pending in U.S. patent court, with a ruling expected at any time. read more

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Acquisition of Cognovo Gives u-blox Own 4G Chip Technology

June 28, 2012By

u-blox, a positioning and wireless semiconductors, announces the acquisition of UK-based Cognovo Ltd., a company specializing in software defined modem (SDM) chip development technology. The acquisition extends u-blox’ chip design capabilities to create differentiated products for strategic markets that require 4G communications combined with global positioning. read more

Hemisphere GPS Introduces A325 GNSS Smart Antenna

June 27, 2012By

Today, Hemisphere GPS introduced the A325 GNSS Smart Antenna. It incorporates professional-level centimeter and sub-meter positioning accuracy powered by Hemisphere GPS' Eclipse receiver technology and includes L-band and Bluetooth communications support. A325 is designed for a variety of applications including agriculture, construction, straddle carriers, robotics, marine, survey, and GIS, Hemisphere GPS said. read more

This article is tagged with , , and posted in Signal Processing, Survey

GSA Begins Preparations for Future EGNOS Services

June 21, 2012By

The European GNSS Agency (GSA) Wednesday published a contract notice in the Official Journal of the European Union inviting operators to bid for the provision of EGNOS services over the 2014-2021 period. This contract will consist in operating, maintaining and upgrading the EGNOS system infrastructure, and ensuring the continuous and safe provision of the three services offered by EGNOS. read more

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