Saab R5 SUPREME AIS, Руководство по эксплуатации и установке

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R5
SUPREME - Navigation System
CONCEPTS AND TERMINOLOGY
7000 118-301, A3 Page 37
3 CONCEPTS AND TERMINOLOGY
This chapter describes some of the commonly used terms of this manual, and the implied
meaning when used in this manual.
Waypoint
A waypoint is a position on the earth's surface, represented by latitude and longitude, which
is given a unique name. A waypoint is typically used for navigation direct to a certain position
or as part of a route.
MOB Waypoint
A temporary waypoint created when using the Man Over Board (MOB) functionality. It is not
possible to use MOB waypoints in routes.
Route
A route is a named, ordered sequence of waypoints, which together describes a path from
the start to the end waypoint. The route currently being sailed is called the active route.
Active Route
The active route is the route currently being sailed and used for navigation. When starting to
sail a route, a copy of the route is made into the active route. Changes made to the active
route do not affect the source route, unless the active route is explicitly stored. Only one
route can be active at any one point in time.
Leg
A leg is the segment of a route between two consecutive waypoints. A route with the
waypoints A, B and C has two legs: ―A to B‖ and ―B to C‖. For each leg in a route, the
navigation algorithm, RAIM accuracy level and cross track error (XTE) limit can be set.
RAIM
RAIM stands for ―Receiver Autonomous Integrity Monitoring‖ and is a GPS integrity
monitoring scheme that evaluates the quality of the position data and is able (under normal
circumstances) to detect a satellite malfunction that results in a large range error. The user
can specify a RAIM accuracy level and the system will give a warning if the range error is
larger than this specified accuracy level.
RAIM Accuracy Level
The RAIM accuracy level is the radius that is used to calculate current RAIM status.
RAIM Status
The RAIM status can be one of safe, caution and unsafe, and is indicated by the RAIM LED
on the front of the R5 SUPREME CDU. If the calculated range error is larger than the
currently used RAIM accuracy level, the RAIM status will be ―unsafe‖ and indicated with a red
light on the RAIM LED. If the error is smaller than the accuracy level, the RAIM status will be
―safe‖ and indicated with a green light on the RAIM LED. If not enough satellites are received
to be able to perform the RAIM calculation, the RAIM status will be ―caution‖ and indicated
with yellow light on the RAIM LED.
Navigation Algorithm