Garmin GTN 750 Посібник користувача - Сторінка 2

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WFDE PREDICTION PROgRAM INSTRuCTIONS

OVERVIEW

The following sections provide an overview of the WFDE Prediction Program and guidelines for when it should

be used. Section 1.2 provides a comprehensive set of guidelines for when a WFDE prediction is required that is

applicable to any installation of a Garmin WAAS enabled unit. Section 1.3 provides specific guidance for GTN

6XX/7XX installations.

1.1

The GARMIN G1000 with GIA 63W, the GNS480/CNX80, and the GNS 400W/500W series products incorporate Fault

Detection and Exclusion (FDE) features, satisfying the requirements of TSO-C145a/C146a and "GPS Oceanic/Remote

Navigation" per FAA AC 20-138A Appendix 1. The GTN 6XX/7XX series products incorporate Fault Detection and Exclusion

(FDE) features, satisfying the requirements of TSO-C146c and "GPS Oceanic/Remote Navigation" per FAA AC 20-138A

Appendix 1. For the purposes of this document, WAAS FDE Prediction, FDE Prediction, and WFDE Prediction may be used

interchangeably.

FDE consists of two distinct parts: fault detection and fault exclusion. Fault detection (RAIM) detects the presence of an

unacceptably large pseudorange error (and presumably, position error) for a given mode of flight or a satellite failure which

can affect navigation. Fault detection is synonymous with RAIM (Receiver Autonomous Integrity Monitoring). Upon the

detection of a fault, fault exclusion follows and excludes the source of the unacceptably large pseudorange error, thereby

allowing navigation to return to normal performance without an interruption in service. FDE functionality is provided for

oceanic, en route, terminal, and non-precision approach phases of flight. The FDE functionality adheres to the missed alert

probability, false alert probability, and failed exclusion probability specified by TSO-C145a/C146a and TSO-C145c/C146c.

The WFDE Prediction Program is used to predict the availability of RAIM/FDE for a specified flight plan. This program

allows the pilot to specify the planned departure date/time, route type, ground speed, ground speed variation, and maximum

allowable outage. When provided through NOTAM or other sources, GPS satellites with known failures can be excluded

through the program's setup function.

NOTE: WAAS is one of several systems generically known as SBAS (Satellite Based Augmentation System). Garmin

WAAS certified products are designed to work with any TSO-C145a/C146a or TSO-C145c/C146c compliant SBAS

system.

The WFDE Prediction Program is designed for use with TSO-C145a/C146a and TSO-C145c/C146c approved WAAS-

(Wide Area Augmentation System) certified Garmin products. These products include:

• GPS 400W, GNC 420W, GNC 420AW, GNS 430W, GNS 430AW

• GPS 500W, GPS 500W TAWS, GNS 530W, GNS 530W TAWS, GNS 530AW, GNS 530AW TAWS

• GNS 480, CNX80

• G1000 with GIA 63W

• GTN 625, GTN 635, GTN 650, GTN 725, and GTN 750

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GARMIN WAAS FDE PREDICTION PROGRAM INSTRUCTIONS

190-00643-01 Rev. E

2/28/2011 1:24:33 PM