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庞巴迪挑战者605公务机机组操作手册 CL605-CHAPTER 17 -导航系统 NAVIGATION SYSTEMS(16)

时间:2011-10-31 11:53来源:蓝天飞行翻译 作者:公务机
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The terrain awareness alerting algorithms continuously compute terrain clearance envelopes ahead of the aircraft, as a function of ground speed, flight path angle and track. If the boundaries of these envelopes conflict with terrain elevation data in the terrain database, alerts are issued. Two envelopes are computed, one corresponding to a terrain caution alert level and the other to a terrain warning alert level.


 NAVIGATION SYSTEMS Description  Vol. 2  17.10.26 
Oct 05/06 


TAAD Caution and Warning Alert Envelopes Figure 17.10.26

TAWS Position and Altitude Determination
The TAWS computer determines aircraft position and altitude using GPS sensor data primarily. The computer monitors RAIM status, and applies geometric altitude algorithms to ensure the required level of precision is maintained laterally and vertically. If GPS is not available, the computer applies barometric altitude calculations for vertical position determination, and uses the FMS integrated navigation solution for lateral position determination.

Terrain/Obstacle Awareness Alerting and Display (TAAD) Database
The TAAD database is comprised of a terrain database and an obstacle database integral to the TAWS computer. The terrain database includes worldwide coverage of the earth’s surface, divided into grid sets referenced to the WGS–84 datum.
The obstacle database contains known man-made obstacles that are higher than 100 feet AGL. This database covers the USA, Canada, the Caribbean, Europe, Australia, and portions of the Middle East and Far East. A complete obstacle database map is available at www.egpws.com

Terrain Awareness Display
The terrain awareness display displays an image of surrounding terrain in varying density dot patterns of green, yellow, and red. The display is generated from the aircraft altitude compared to terrain data in the TAWS computer. These dot patterns represent specific terrain separation with respect to the aircraft. Terrain more than 2,000 feet below the aircraft is not displayed. Areas with no terrain data available are shown as a low-density magenta color.
The obstacle data included is depicted on the terrain display in the same fashion as terrain.


 NAVIGATION SYSTEMS Description  Vol. 2  17.10.27 
Oct 05/06 


Terrain/Obstacle Awareness Display Color Patterns Figure 17.10.27
The crew may independently select the terrain display on either PFD or MFD by selecting the function on the appropriate menus. The terrain display can be overlaid on any PFD/MFD format that supports weather radar overlay. A cyan TERRAIN annunciation appears on the bottom right corner of the displays to inform the flight crew that the terrain overlay has been selected. Weather radar and terrain cannot be displayed simultaneously on the same display.
Auto Pop-Up
When a terrain awareness caution or a terrain awareness warning are detected, the terrain overlay automatically pops up on both PFDs, and the format and range automatically change to PPOS MAP and 10 NM.
 
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