Airmar LB150 User Manual

Page 63

LB150 WeatherStation Technical Manual revision 0.013

Proprietary and Confidential

PRELIMINARY - DRAFT

The Wide Area Augmentation System (WAAS) uses a system of land based

reference stations and geostationary satellites to augment the Global Positioning

System (GPS) in order to provide additional accuracy, integrity, and availability.

Several GPS Sentences are able to differentiate between WAAS (Differential)

fixes and those fixes that do not use WAAS corrections.

The available WAAS modes are:

0 – Disable WAAS

1 – Enable WAAS, but report WAAS fixes as GPS (Autonomous, non-

differential). This is provided for backward compatibility for systems that

might not recognize WAAS (Differential) fixes.

2 – Enable WAAS, and report WAAS fixes as Differential.

The default mode is 2.

This setting is stored in EEPROM within the unit, and retrieved on power up.

Option 4:

This option can be used to direct the GPS to use a specific WAAS satellite. This

value is NOT stored in EEPROM.

Option 5:

This option can be used to direct the GPS how to handle type 0 messages. This

value is NOT stored in EEPROM.

This manual is related to the following products: