DOT studying threats to GPS
- By Paula Shaki Trimble
- Mar 28, 2000
The Transportation Department is investigating the vulnerability of its
Global Positioning System-based infrastructure in response to a presidential
Following a recommendation from the President's Commission on Critical
Infrastructure Protection and Presidential Decision Directive 63, DOT charged
the Volpe National Transportation System Center with studying threats to
the GPS signal received from the Defense Department's 28-satellite constellation,
said Joseph Canny, deputy assistant secretary for navigation systems policy
at DOT. Canny spoke at the Coast Guard-sponsored Civil GPS Service Interface
Committee meeting Tuesday in Fairfax, Va.
Volpe completed the first phase of the study in July 1999 by documenting
the threats of interference to GPS systems for railroad, maritime, aviation
and intelligent transportation system users, Canny said.
The second phase, expected to be complete this summer, will look at
how to overcome those threats. The solution includes FAA's decision to scale
back ground-based navigational aids to a basic backup network rather than
phasing them out altogether, he said.
The study will be a "guide to future policy development and decision-making
on retention of other navigation systems and the development of [GPS] augmentation
systems," Canny said.