System Overview
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| System Overview |
- System Description
The Wide Area Augmentation System (WAAS) is a GPS-based navigation and landing system that provides precision guidance to aircrafts at thousands of airports and airstrips, where there is currently no precision landing capability. WRS’s and integrity monitors are widely dispersed data collection sites that contain GPS/WAAS ranging receivers that monitor all signals from the GPS, as well as the WAAS geostationary satellites. The reference stations collect measurements from the GPS and WAAS satellites so that differential corrections, ionospheric delay information, GPS/WAAS accuracy, WAAS network time, GPS time, and UTC can be determined. The WRS and integrity monitor data are forwarded to the central data processing sites. These sites process the data in order to determine differential corrections, ionospheric delay information, and GPS/WAAS accuracy, as well as verify residual error bounds for each monitored satellite. The WAAS-NIES provides a simulation of the accuracy of the WAAS system that monitors GPS constellation of satellites. The WAAS-NIES subsystem hardware is scalable to meet requirements for simulating the WAAS system. The software of the WAAS-NIES subsystem is portable to other platforms (such as a PC) to allow re-use in smaller-scale simulations for single-task use.
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