Signal Processing - May 2017 - 11
Figure 1. The simulation results for an unmanned drone flying over downtown Los Angeles showing the true trajectory (red line) with GPS navigation
only (yellow line) and GPS aided with cellular signals (blue line). (Figure used courtesy of UCR.)
numerically controlled oscillators. "Our
integrated navigation filter uses extended
Kalman filters," Kassas says.
SOPs have been extensively analyzed
for communication applications, yet are
still not well understood as potential
PNT sources. "We have been deriving theoretical signal models capturing
phenomena that were never discovered
prior to our research, because these
signals were not intended for PNT purposes," Kassas says. "For example, we
discovered that the observed clock bias
corresponding to different sectors in
the same base transceiver station cell
is not the same." The difference turned
out to be on the order of nanoseconds.
"While the difference is not harmful for
communication purposes, it introduces
positioning error of tens of meters if not
modeled and accounted for appropriately," Kassas explains.
Kassas says that autonomous vehicles
are likely to benefit most from his team's
research. "Autonomous vehicles will
inevitably result in a sociocultural revolution," he says. "Our overarching goal is
to get these vehicles to operate with no
human in the loop for prolonged periods
of time, performing missions such as
search, rescue, surveillance, mapping,
farming, firefighting, package delivery,
and transportation."
Space optical communication
and navigation
In 2013, the U.S. National Aeronautics
and Space Administration (NASA)
demonstrated the Lunar Laser Communication Demonstration experiment,
a laser communication prototype that
achieved record-breaking data download and upload speeds between Earth
and the moon. Now, a NASA optical
physicist claims he can equal those
speeds and create extremely precise distance and speed measurements using a
single compact package (Figure 2).
Figure 2. NASA optical physicist Guan Yang (right) and research associate Wei Lu pose in front of
the lasercom breadboard they created to demonstrate high data-rate download and uplink speeds as
well as highly precise distance and speed measurements all from the same, relatively small package.
(Photo used courtesy of NASA.)
IEEE Signal Processing Magazine
|
May 2017
|
11
Table of Contents for the Digital Edition of Signal Processing - May 2017
Signal Processing - May 2017 - Cover1
Signal Processing - May 2017 - Cover2
Signal Processing - May 2017 - 1
Signal Processing - May 2017 - 2
Signal Processing - May 2017 - 3
Signal Processing - May 2017 - 4
Signal Processing - May 2017 - 5
Signal Processing - May 2017 - 6
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Signal Processing - May 2017 - 8
Signal Processing - May 2017 - 9
Signal Processing - May 2017 - 10
Signal Processing - May 2017 - 11
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Signal Processing - May 2017 - 18
Signal Processing - May 2017 - 19
Signal Processing - May 2017 - 20
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Signal Processing - May 2017 - 28
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Signal Processing - May 2017 - 88
Signal Processing - May 2017 - 89
Signal Processing - May 2017 - 90
Signal Processing - May 2017 - 91
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Signal Processing - May 2017 - 96
Signal Processing - May 2017 - 97
Signal Processing - May 2017 - 98
Signal Processing - May 2017 - 99
Signal Processing - May 2017 - 100
Signal Processing - May 2017 - 101
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Signal Processing - May 2017 - 103
Signal Processing - May 2017 - 104
Signal Processing - May 2017 - 105
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Signal Processing - May 2017 - 109
Signal Processing - May 2017 - 110
Signal Processing - May 2017 - 111
Signal Processing - May 2017 - 112
Signal Processing - May 2017 - Cover3
Signal Processing - May 2017 - Cover4
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