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Inside GNSS: Engineering Solutions from the Global Navigation Satellite System Community
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Human Engineering • September/October 2007

Karl Kovach: Keeper of the Code

Karl Kovach may be the only person who can claim that he helped design every single one of the Navstar GPS navigation signals.

Recognized by GPS cognoscenti as high priest of the ICD, systems engineer Kovach serves as one of the chief keepers of the GPS Interface Control Documents, the technical specification bible for GPS signals and the essential guide for GPS receiver manufacturers. And that’s not all — the U.S. Air Force’s high-altitude, long-range unmanned air vehicle Global Hawk lands itself, thanks to an innovation Kovach patented in 2003.

Inside GNSS • July/August 2007

U.S. Air Force Releases GPS Block IIIA Satellite RFP

After several false starts in the previous months and a multi-year delay in the overall GPS III architecture development, the GPS Wing (formerly the GPS Joint Program Office) announced on July 12 the release of a request for proposal for the development and production of the GPS Block IIIA satellites.

Inside GNSS • July/August 2007

GPS + GLONASS for Precision

The SC Geodetic Survey (SCGS) has combined the technologies of the GPS, GLONASS, cellular communications and high-speed server networks to provide centimeter-level accuracy in real-time for surveying, mapping, and engineering applications.

Working Papers • July/August 2007

Authenticating GNSS: Proofs against Spoofs, Part 1

Authentication is an essential problem in the field of communication: confirming that a pretended identity of a user or transmitted information does, in fact, really correspond to the true identity or source.

Inside GNSS • July/August 2007

More Compass Points: Tracking China’s MEO Satellite on a Hardware Receiver

In 2000 China deployed the Beidou-1 navigation system. Originally this S-band system provided ranging information via geostationary satellites that operate as transponders. This system design required bulky two-way radios, had a limited capacity, and coverage was restricted to East Asia.

Inside GNSS • July/August 2007

GNSS Over China: The Compass MEO Satellite Codes

On April 14, 2007 (local time), China launched the Compass M-1 satellite. This satellite represents the first of a new global navigation satellite system (GNSS) that is planned to have a total of 35 satellites. Unlike prior Chinese navigation satellites, Compass M-1 broadcasts in L-band, using signal structures similar to other GNSS systems and sharing frequencies near to or overlapping those of GPS, Galileo, and GLONASS.

Inside GNSS • May/June 2007

Opening the GATE

Nestled amid the slopes and valleys of southeastern Germany’s precipitous Alps, a novel installation has taken form over the past three years that will allow receiver designers and application developers to have real-world experience with Galileo signals years before Europe’s GNSS becomes operational.

Human Engineering • May/June 2007

Ruth Neilan: The Global Grid Master

When Ruth Neilan was named director of what is now known as the Central Bureau of the International GNSS Service (IGS), she had an immense undertaking before her.

A voluntary civilian federation, the IGS compiles and analyzes GPS (and more recently, GLONASS) satellite data. From these, the IGS creates highly accurate products —such as precise satellite orbit and clock files — and makes them freely available to engineers, scientists, and researchers all over the world.

GNSS Solutions • May/June 2007

Host-Based Processing and Choosing Inertial Sensors

Q: What is “host-based processing” of GPS signals and how does it compare to traditional systems on a chip and software GPS approaches?

A: The last few years have seen the emergence of mobile wireless and other devices using a host-based GPS architecture, in which portions of the software traditionally executed within the GPS chip are now performed in the host software.

Inside GNSS • Spring 2007

Enhancing the Future of Civil GPS: Overview of the L1C Signal

The Global Positioning System is undergoing continual modernization, providing ongoing improvements for users worldwide. Although various enhancements in system features have been under development since the mid-1990s, modernization first benefited civil users when Selective Availability — a security-motivated technique for “dithering” the open L1 signal to reduce positioning accuracy — was set to zero in May 2000.

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