Dgps Beacon System - NorthStar MX500 Operator's & Installation Manual

Operator's Manual

DGPS Beacon System

As Maritime Safety Administrations, Navy, and Coast Guard Orga-
nizations realize the limitations of standard GPS positioning, many
have begun installing DGPS Beacon Stations. While an understand-
ing of this system is not necessary for operating receivers with inter-
nal beacon receivers, you may want to read on to have a better under-
standing of how your receiver is capable of achieving the high levels
of accuracy made possible by this network of transmitters.
The DGPS Beacon System is comprised of three segments: the refer-
ence station, Integrity Monitor (IM) equipment located at the beacon
site, and the Navigator equipment located on board the user's boat or
vehicle. The DGPS beacon system design is illustrated below.
5271-01C.500
Because of the limited range of the beacon transmitters, typically
150 to 400 km, the corrections generated by the reference station are
always valid for users who can receive the correction signals and
maintain a 5 meter or better accuracy figure.
10
MX 9400N
D GP S Na vig at or
MX 51R
Integrity Monitor Site
Surveyors / Commercial
Users
Reference Station Site
MX 9400R
D GPS Re fer e n ce
M X 50M
DGPS Beacon Modu lat or
Navigator Site
Professional / Commercial /
Personal Craft Users
Version 3.0
DGPS