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September 26, 2007

GLONASS has "preliminary approval" to transmit CDMA GLONASS signals at L1, L5

GLONASS has gotten “preliminary approval” to add code division multiple access (CDMA) signals to future satellites.

Since its initiation in the early 1980s, the Russian GNSS system has employed frequency division multiple access (FDMA) techniques in which the same code is used for the signals broadcast by the system, with individual spacecraft being distinguished from one another by a specific frequency allocation. Russia would almost certainly continue broadcasting FDMA signals on existing frequencies.

September 19, 2007

Selective Availability: Completely Dead

Selective Availability (SA), the contentious issue of degrading the open GPS civil to advantage military signals, is going away for good under the terms of a presidential decision announced September 18.

September 18, 2007

NovAtel Inc. Buys Antenna Company

NovAtel Inc. has acquired privately held antenna manufacturer Antcom Corporation (Antcom) for $5 million in cash and an additional $1 million in cash subject to Antcom's achievement of certain financial targets for the calendar year ended December 31, 2007.

September 14, 2007

USAF evolves GPS architecture with $800 million upgrade to ground control segment

On September 14, Air Force crews at Schriever AFB, Colorado, completed the initial phase of an $800 million upgrade to the GPS operational control segment.

Operators in the 2nd Space Operations Squadron (2SOPS) of the USAF 50th Space Wing migrated control of the GPS satellite constellation and ground monitoring facilities from a 1970s-era mainframe computer to a distributed IT infrastructure with advanced automated features. The 50th Space Wing, through the 2nd SOPS, performs the satellite command and control mission for the Global Positioning System.

September 12, 2007

ICG sets up new Providers Forum to pursue compatibility among GNSS systems, augmentation systems

Operators of the world’s four GNSS systems and regional augmentation systems have laid the foundation for a multilateral environment in which to discuss issues of compatibility and interoperability.

September 9, 2007

It’s MBOC for common Galileo-GPS civil signal

The United States and the European Union (EU) have agreed to use the multiplexed binary offset carrier (MBOC) for a common GPS-Galileo signal for civilian use. In the future, this will enable combined GNSS receivers to track the GPS and Galileo signals with higher accuracy, even in challenging environments that include multipath, noise, and interference.

These signals will be implemented on the Galileo Open Service and the GPS IIIA new L1 civil signal known as L1C.

Inside GNSS • September/October 2007

What’s Going On? RFI Situational Awareness in GNSS Receivers

In-band radio frequency interference (RFI) is a serious threat to the reliable operation of GNSS receivers. When the RFI power level is high enough to render the GNSS receiver inoperable, usually no visible external signs appear indicating that anything is out of order; so, the user initially assumes the receiver has experienced an internal failure.

Inside GNSS • September/October 2007

GNSS Time Offset

By measuring the elapsed time between the transmission and reception of GNSS signals, navigation receivers calculate the pseudorange to each satellite and use this information to calculate their position on Earth. However, receivers not only have to calculate the user’s position in a 3D environment; they also have to cope with an unknown time bias between the receiver and the GNSS system.

Inside GNSS • September/October 2007

The MBOC Modulation

As emphasized in the European Commission (EC) “white paper” on European transport policy for 2010, the European Union (EU) needs an independent satellite navigation system. Galileo is Europe’s contribution to the global navigation satellite system of systems (GNSS) and has committed itself from the very beginning to developing a signal plan that would provide sufficient independence from GPS, while also being compatible and interoperable with it.

GNSS Solutions • September/October 2007

eLoran and Signal Reception Under Snow

Q: How well can GPS signals penetrate avalanche snow?

A: Surprisingly, GPS signals penetrate avalanche snow very well.

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