calculation. The receiver subtracts the error bias equally from each range
solution until the LOP’s intersect. Theoretically, this process can produce
highly accurate position fixes for navigation. (+
I-
15M rms).
Continuous tracking of each satellite signal allows the receiver to perform
this timing adjustment process and to calculate accurate measurements to
the satellites. The
RAYSTAR
100
uses high-speed multiplexed scanning in a
single channel receiver. This receiver design method provides fast efficient
acquisition and accurate position updating, while saving in overall unit size
and weight, cost, and power consumption.
Unfortunately, the Department of Defense has included a special mode
into the GPS satellite system design which introduces variable timing errors
into the satellite signals. This mode is known as “Selective
Availability”and
when it is enabled, it is designed to provide less accurate fixes for all users
(except authorized military users). Accuracy in the order of +
/-
100 meters
rms 95
%
of the time is obtained when SA is ON. This means that 95
%
of
the time the actual position will be within a radius of
100
meters; 5
%
of the
time it will be outside of this 100 meter circle. Selective Availability has
been enabled
almost
continuously since early 1991.
Please continue reading the next section
ofthis
manual before proceeding
with the installation and operation of the
V8010
unit. There are some
important recommendations regarding successful installation practices for
obtaining the best echo sounder performance.
If you have elected to add the Raystar 100 GPS sensor option to your new
video sounder system, specific installation information for installing the
GPS sensor will be found in the Raystar
100
GPS Sensor manual.
IN’IRODUCTION
7
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