***
Special Notice: *** Please be advised that our mailing
address has changed and is now: U.S. Coast Guard Navigation
Center, NAVCEN MS 7310, 7323 Telegraph Road, Alexandria, VA 20598
- 7310. Mail sent to our previous address will not be delivered. Please
contact us with concerns
or questions. Our physical location remains the same. Thank you for
your attention to this matter.
SIGNAL IN SPACE is a category
of problems in satellite transmission,
code generation, satellite upload, satellite position, space
environmental degradation, etc.
BLOCKAGE / MASKING occurs when
radiated SV signals are unable to reach the receiver antenna
systems, such as when traveling through a tunnel, under a dense
forest canopy, when indoors, etc.
INTERFERENCE can occur when high
electromagnetic conditions exist.
EQUIPMENT FAILURES (either hardware
or software) can include loss
of power supply, software bugs, physical damage to the system,
etc.
INTEGRATIONS are sources of discrepancies
due to interfaces with host
vehicles, embedded systems, power, antenna orientation, output
formats, etc.
OPERATOR ERROR occurs by inadequate
training, miss-keying, improper
installation or use and set-up, etc.
