lkd-aerospace
Inside GNSS: Engineering Solutions from the Global Navigation Satellite System Community
GPS Galileo Glonass BeiDou Regional/Augmentation
Inside Unmanned Systems
Thought Leadership Series
Galileo
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.

Working Papers • September/October 2007

Authenticating GNSS: Proofs against Spoofs, Part 2

The emergence of a multi-GNSS world will inevitably require the civil GNSS user community to address the issue of signal authentication: confirming that a pretended identity of a user or transmitted information is, in fact, real and correct.

This two-part column focuses on the concepts and methods for achieving authentication in GNSS operations. In the July/August issue, the column began by introducing some of the cryptographic concepts, terminology, and techniques used to develop and implement authentication methods in navigation systems in general.

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 • July/August 2007

Galileo’s New PPP: Public-Public Partnership?

Having abandoned — for the time being at least — attempts to attract private investment to the creation of Galileo’s infrastructure, European GNSS leaders are working to shape a Plan B that can gain support from the program’s extensive group of stakeholders.

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.

Inside GNSS • May/June 2007

Speaking with Authority: Galileo's Lead Agency in a Changing World

Sometimes things don’t go as planned.

Signals
Trimble
Trimble
Jammer Dectector
Sensonor
Spectracom
CAST
NovAtel
globe Copyright © Inside GNSS Media & Research LLC. All rights reserved.
157 Broad Street, Suite 318 | Red Bank, New Jersey USA 07701
Telephone (732) 741-1964

Problems viewing this page? Contact our webmaster.