FAA-E-AJW44-2937A, FEDERAL AVIATION ADMINISTRATION NON-FED SPECIFICATION: CATEGORY I LOCAL AREA AUGMENTATION SYSTEM GROUND FACILITY (21-OCT-2005)

FAA-E-AJW44-2937A, FEDERAL AVIATION ADMINISTRATION NON-FED SPECIFICATION: CATEGORY I LOCAL AREA AUGMENTATION SYSTEM GROUND FACILITY (21-OCT-2005)., This specification establishes the minimum performance requirements for the non-Federal Category I (CAT I) Local Area Augmentation System (LAAS) Ground Facility (LGF). Requirements contained within this specification are based on FAA-E-2937A and are the basis to augment the Global Positioning System (GPS) to provide precision approach capability down to Category I minimums and area navigation (RNAV). In addition, this specification contains optional requirements to support Terminal Area Procedures (TAP) in accordance with LAAS ICD (RTCA/DO-246C). The performance requirements are suitable for use with a Minimum Operational Performance Standards (MOPS) airborne user that conforms to LAAS MOPS (RTCA/DO-253A) and the International Civil Aviation Organization (ICAO) Annex 10 including amendment 76 and 77. The LGF is a safety-critical system consisting of the hardware and software that augments the GPS Standard Positioning Service (SPS) providing RNAV in the terminal area and a precision approach and landing capability. The current GPS positioning service provided is insufficient to meet the integrity, continuity, accuracy, and availability demands of precision approach and landing navigation. The LGF, using differential GPS concepts, augments the GPS SPS in order to meet these requirements. The GPS/LAAS is maintained in three separate segments; the LGF, the Space Segment, and the Airborne Subsystem as illustrated in Figure 1-1. The LGF provides differential corrections, integrity parameters, and precision approach pathpoint data that are broadcast via a Very High Frequency (VHF) Data Broadcast (VDB) to the Airborne Subsystem for processing. The Space Segment provides the LGF and Airborne Subsystem with GPS ranging signals and orbital parameters. The Space Segment also provides the LGF and Airborne Subsystem with optional Satellite-Based Augmentation System (SBAS) ranging signals and orbital parameters. The Airborne Subsystem applies the LGF corrections to the GPS and SBAS ranging signals to obtain position with the required accuracy, integrity, continuity, and availability. The differentially corrected position is used, along with pathpoint data, to supply deviation signals to drive appropriate aircraft systems supporting terminal area and precision approach operations. Furthermore, using the position output from the airborne receiver, LAAS augments the availability of terminal area operations for aircraft equipped with RNAV capability. The LGF provides detailed status information to support maintenance and air traffic requirements. Status and control capabilities are executed through a Maintenance Data Terminal (MDT). Additionally, the LGF sends status information to FAA Air Traffic Control (ATC) via an Air Traffic Status Unit (ATSU). For maintenance purposes, LGF status information is available on the Local Status Pane l (LSP).