Inside GNSS: Engineering Solutions from the Global Navigation Satellite System Community
GPS Galileo Glonass BeiDou Regional/Augmentation
Inside Unmanned Systems
Thought Leadership Series
Inside GNSS magazine • Volume 5 Number 5

July/August 2010

Online News, Articles, and Features

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Cover Story

On the Air

New Signals from the First GPS IIF Satellite

The launch of the first GPS Block IIF satellite brought new GNSS signals
on the air. Researchers at the German Aerospace Center and Stanford
University provide an early analysis of all three signals on SVN62. The
result? L5 is up to spec, L1 ourperforms, but there is distortion in the
L5 I/Q scattershot.

Technical Article

Aviation Grade

New GPS Signals — Chips Off the Block IIF

Civil aviation depends on augmentation systems that use many monitors
and complex algorithms to make sure signals meet ever higher
requirements for accuracy and integrity. This includes estimating the
size of errors due to signal deformations.  Research teams from the
United States and Germany focus on the quality of the chips in signals
from the new Block IIF satellite. Their findings: the IIF L1 C/A is a
superior signal suitable for aviation, and L5 chip quality —at least
initially—appears very similar to previous measurements for L1 but
deeper analysis is underway.

Technical Article


Some Proposals on Signal Formats for Future GNSS Air Interface

CDMA will soon supplement GLONASS’s FDMA signal. In this article, the
authors explore the selection of a ranging code ensemble and the
modulation mode for the new signal.They propose Kerdock signature sets
for ranging code ensembles and MSK-type modulation

Technical Article

Testing Multi-GNSS Equipment

Systems, Simulators and the Production Pyramid

As new GNSS systems appear, the time for multi-GNSS simulator testing
has arrived. Three receiver designers and researchers look at use of
this essential tool throughout the entire receiver development cycle:
from research, development, design and validation through chip, module,
OEM and user device development sequences and on to consumer testing,
certification, maintenance and repair.

Columns & Editorials
Working Papers

Aviation Applications: Hybrid Navigation Techniques and Safety-of-Life Requirements

Second of Two Parts

Germany's publicly-funded UniTaS IV
project investigates satellite navigation applications for aviation. In
the second part of this series, the authors investigate signal
authentication for safety-of-life and also describe the GATE Galileo
test infrastructure.

Thinking Aloud

Interesting. Too Interesting?

Receivers are going to get complicated. Very complicated.

More systems, more satellites, more signals — A conservative
estimate totals 441 different modes that a receiver could operate in. Difficult as they
now appear, sorting out frequency-sharing issues among the various providers
may turn out to be the easy part.

GNSS Solutions

Generating Carrier Phase Measurements

How do you generate carrier phase measurements in a receiver? Columnist
Mark Petovello asks the University of Calgary's Cillian O'Driscoll for
the solution.

GNSS Hotspots

GNSS Hotspots

GNSS data points and factoids to amuse and inform

Seattle; Park City, Utah; Baikonur spaceport; Satish Dhawan space center; Tanegashiwa space center

360 Degrees
Industry View
New Products
134 • GNSS Simulators

Aeroflex GPS/Galileo

Jammer Dectector
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