New Signals from the First GPS IIF Satellite
Steffen Thölert, Steffen Erker, Michael Meurer: DLR–German Aerospace Center. Liang Heng, Eric Phelts, Grace Gao, Gabriel Wong, Todd Walter and Per Enge: Stanford University
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
New GPS Signals — Chips Off the Block IIF
R. Eric Phelts, Grace Gao, Gabriel Wong, Liang Heng, Todd Walter, Per Enge-Stanford University.
Stefan Erker, Steffen Thölert, Michael Meurer-German Aerospace Center (DLR).
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
Valery P. Ipatov and Boris V. Shebshaevich, Russian Institute for Radionavigation and
Time
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
Systems, Simulators and the Production Pyramid
Ivan Petrovski, iP-Solutions; Bryan Townsend, Roberton Enterprises Ltd.; Takuji
Ebinuma, University of Tokyo
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.
Working Papers
Second of Two Parts
Ulf Bestmann, Benedikt von Wulfen, Peter Hecker, Technische Universität Braunschweig;
Felix Kneissl, Victoria Kropp, University
FAF Munich
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
Receivers are going to get complicated. Very complicated.
Glen Gibbons
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
Columnist Mark Petovello with Cillian O'Driscoll, University of Calgary
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 data points and factoids to amuse and inform
Eliza A. Schmidkunz
Seattle; Park City, Utah; Baikonur spaceport; Satish Dhawan space center; Tanegashiwa space center
GNSS News
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