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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.

Inside GNSS • Spring 2007

Network Assistance: What Will New GNSS Signals Bring to It?

Globally, GNSS markets are experiencing a sharp growth in sales of consumer products and services. Among these is a cluster of applications known collectively as location based services (LBS), a rapidly evolving field of wireless data services that provide users of mobile terminals with information about their surroundings. As a typical example, travellers can receive directional assistance using downloaded digital maps on which graphical symbols indicate points of interest.

Inside GNSS • Spring 2007

USAF Lets L5 Demo Contract; GPS III RFPs

The U.S. Air Force has awarded Lockheed Martin Company a $6 million contract to develop and integrate a demonstration payload that will temporarily transmit an L5 civil signal on a modernized GPS Block IIR (GPS IIR-M) satellite.

Inside GNSS • Spring 2007

PNT Executive Group Gains New Co-Chair, Advisory Board

President Bush’s appointment of retired U.S. Coast Guard Vice Admiral Thomas Barrett as Acting Deputy Secretary of Transportation has brought a new co-chairman to the U.S. Space-Based Positioning, Navigation, and Timing Executive Committee (PNT EXCOM).

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