GPS
Information from the Stanford GPS Lab
The
GPS Research Laboratory works with
the Federal Aviation Administration, U.S. Navy, U.S.
Air Force, Arinc, NASA and U.S. Coast Guard to pioneer
systems that augment the Global Positioning System (GPS)
and Galileo. These augmentations broadcast differential
corrections to improve accuracy, provide error bounds
in real time, and/or mitigate radio frequency interference.
Specific projects include:
The
Wide Area Augmentation System
(WAAS) already supports millions of land and marine
users across North America. It became operational for
aviation in July of 2003.
Currently, we are working with the FAA to help define
the L5 WAAS design. We are researching different
options to bring to the L5 signal as part of the GEAS.
The goal is to achieve worldwide LPV-200 approach
capabilities.
Briefing on the GNSS Evolutionary Architecture Study
(GEAS)
The
Local Area Augmentation
System (LAAS) will eventually support automatic
landings at high-traffic hub airports.
The
Joint Precision Approach
and Landing System (JPALS) will support aircraft
landings on aircraft carriers and military air fields.
Technologies
that address the vulnerability of satellite navigation
to radio frequency interference are of interest. These
include the integration of existing terrestrial radio
navigation systems like Loran
- now called enhanced Loran or eLoran. The lab is also
very active in the investigation of software receivers
that integrate inertial navigation and adaptive antennas.
Earlier,
the laboratory worked with the U.S. Coast Guard to design
a medium frequency radio system to broadcast differential
corrections to maritime users of GPS. Today, this system
covers much of the world's coastline and provides differential
GPS data to 1.5 million users.
Overview of the Laboratory and Student Research
The Stanford GPS Laboratory, headed by Professor Per
Enge, has a staff of professional researchers, over 10
Ph.D. students as well as graduate students seeking
other degrees. For an overview of the Stanford GPS
Laboratory, check out this website and this
presentation. Examples of recent student work
are given in the links below.
1) Next generation integrity for aviation. We work
on the next generation of navigation systems for the
FAA. Key to this is developing integrity in the
outputs of this system. One current research area
is advanced receiver autonomous integrity monitoring (ARAIM).
ARAIM will allow the use of GPS for precision landing
worldwide with minimal ground infraststructure.
Here are some papers on ARAIM
Background
2) Next generation GNSS, new signals, and
signal monitoring. We provide
description of the
Galileo code/code generator derived from data
measurements as well as the new
Stanford GNSS Monitor Station
(SGMS). Most current information added is on the
GIOVE-B L1 code
generator and GIOVE-B
E5 code
generator.
3) Controlled Reception Pattern Antenna (CRPA).
CRPA antenna technology uses an array of antenna and
signal processing to increase resistance to interference
and jamming.
Click here to see a presentation by Dr.
David De Lorenzo on his student research in processing
signals from a CRPA
4) Position Navigation Time (PNT) based Encryption (Geoencryption).
Location information can be used to provide a
cryptographic key allowing content to be controlled.
Hence decryption can be regulated to occur at specified
locations or times only.
Click here to see a presentation by Dr. Di Qiu on her
student research in signal authentication and geoencryption.
Alternative
Position Navigation Timing (APNT) Spring 2011 Update
Global Safety of Life from GNSS
Security For and From GPS
Geosecurity: Background
and Research
A description of the
Compass/Beidou E2
Code from data collected from the SGMS.
GPS Textbook for AA272C Satellite Navigation and AA272D
Advanced topics in Satellite Navigation
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