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Inside GNSS: Engineering Solutions from the Global Navigation Satellite System Community
GPS Galileo Glonass BeiDou Regional/Augmentation
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Inside Unmanned Systems
Inside Unmanned Systems
Thought Leadership Series
GPS
GNSS Solutions • April 2006

Adaptive Antenna Arrays, Multi-GNSS Tropospheric Monitoring, and High-Dynamic Receivers

Q: What is adaptive nulling vs. adaptive beamforming? What are the advantages and disadvantages?

A: Adaptive arrays are perhaps the single most powerful antijamming tool in the GNSS systems engineer’s toolkit. They can provide anywhere from 15 to 90 dB of jamming rejection depending on the specific architecture used. Their main disadvantage is that they require an array of antenna elements, each spaced about four inches apart (center to center), and thus are physically large.

Inside GNSS • March 2006

White House Defense Budget Proposes GPS Funds

The Bush Administration’s Fiscal Year 2007 (FY07) budget proposal for the Department of Defense (DoD), announced in February, allocates $315,314,000 in advanced technology development for GPS, including work on the GPS III program. If approved by Congress, that would represent a sizable increase from the FY06 expenditures of more than $85 million and $33 million in FY05.

Inside GNSS • March 2006

Japan’s GPS Augmentation Systems Gets MTSAT-2

Japan launched its second Multi-Functional Transport Satellite (MTSAT-2) on February 18, opening a new phase of precision air navigation and air traffic control (ATC) over the western Pacific Ocean.

GNSS Solutions • March 2006

Carrier Phase Ambiguity Resolution, GNSS Use In Cellular Telephone Systems, and New Antennas?

Q: Will I need a new antenna for the new GPS and Galileo signals? Will one antenna work for both systems?

A: To answer these questions, information will be presented on the GPS and Galileo signal formats, some antenna basic fundamentals with various user applications in mind, followed by some predicted performance assessment.

Inside GNSS • January/February 2006

GPS L2C is on the air

Civil GPS users now have a second full signal available to them — albeit on only one satellite and “at the user’s own risk” — courtesy of the first modernized Block IIR (IIR- 14M) spacecraft launched last September. And the world’s geodetic community is already moving to take advantage of it with announcement of an addendum to the receiver autonomous exchange (RINEX) format used to combine high-precision position data from different types of GPS receivers.

GNSS Solutions • January/February 2006

Reference Systems, UTC Leap Second, and L2C Receivers?

Q: Will the new L2C signals be able to be tracked by existing L2-capable (civilian) receivers?

Inside GNSS • January/February 2006

GNSS Trilogy 2006

Oops! Wait a minute! Hold your horses there, Homer; it’s not that Odyssey. We’re talking about the GNSS odyssey.

More than 30 years in the making, not a mere decade. And its heroes didn’t simply drift idly about the wine-dark Mediterranean enjoying the rosy-fingered dawn like Odysseus and his buddies. The GNSS crew — GPS, GLONASS, and now Galileo — has traveled from California to Colorado to Brussels, Moscow, India, Kazakhstan, Beijing, Tokyo, and beyond!

Inside GNSS • Spring 2007

Turning Point:Trajectory Analysis for Skiers

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