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Tracking & Wireless
Hurricane Hunters
GPS Dropsondes Trace Katrina's Course
The U.S. Naval Research Lab and National Oceanic and Atmospheric Administration pilots flew repeated sorties into the eyewall of Hurricane Katrina to release GPS-enabled dropsondes designed to track and predict wind strength, speed, and direction, gathering data for storm prediction and response.
by Marty Whitford

Design Challenge
A Single-Chip GPS Receiver
And the Steps to Mass-Market Galileo
As GPS chip volumes per manufacturer reach millions for the automotive market and tens of millions for consumer GPS, the market map for a single-chip GPS changes considerably. The advent of Galileo will bring out the full benefits of sensitivity, creating an opportunity for low-cost, high-integration one-chip solutions.
by Philip G. Mattos

Tracking & Wireless
Assistance When There's No Assistance
Long-Term Orbit Technology for Cell Phones, PDAs
Assisted GPS (AGPS) devices require connection to an AGPS server almost hourly. But Long-Term Orbit data, obtainable over the Internet, can enable a locatable cell phone or PDA to position itself accurately for as long as four days without further assistance.
by David Lundgren and Frank van Diggelen

Innovation: Navigation & Guidance
Turn, Turn, Turn
Wheel-Sensor Dead Reckoning for Vehicle Navigation
As an alternative to gyro-based dead-reckoning systems to augment GPS in intelligent vehicle navigation, manufacturers may turn to independent wheel-speed sensor (WSS) measurements from the front and rear axles to calculate changes in yaw rate. WSS is a fundamental component of antilock brake systems that are standard equipment on most new vehicles.
by Curtis Hay

Views, News, Departments
The View from Here
Adventures in Interoperability
by Scottie Barnes

Position
The Challenges of M-Code at JPO
by Col Richard Reaser Jr., Col Philip LoSchiavo, and Lt Col Glenn Fyfe

Global View
First Modernized GPS Satellite; NGA Data Drives Improved Accuracy; PNT Research Center at Stanford; Irish Autos Aim at Toolbooth Elimination; Plenary Discusses New Era in GNSS

Marketplace
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