Global Navigation Satellite System (GNSS) SubcommitteeLast Update: September 19, 2008Chairman: Daniel Domey - CMC Electronics Goal: The goal of the GNSS Subcommittee is to update the standards for GNSS-based navigation and approach equipment for use on air transport airplanes. The standards specify a high level of performance with an objective of minimizing the cost of procurement, implementation, and maintenance. The objective is to promote the use of the latest GNSS augmentations to their full potential for both navigation only sensors per ARINC 743A and navigation and approach sensors per ARINC 743B. Scope: The scope of the activity is to update the existing ARINC 743A-4 characteristic to produce both a 743A-5 and a 743B Characteristic. ARINC Characteristic 743A-5 will retain the same purpose as Characteristic 743A-4 (GNSSU navigation sensor) and be made compliant with the latest MOPS that defines GNSS augmentations (DO-229D, DO-253B, and DO-310). References from other Characteristics (e.g. ARINC Characteristic 755-3) will remain intact. ARINC Characteristic 743B will introduce the GNSS Landing System Sensor Unit (GLSSU) that adds the approach function to the ARINC 743A-5 sensor using available GNSS augmentations. The alternate configuration of the sensor will have a new approach connector to support the approach function; the navigation connectors defined in Characteristics 743A-5 and 743B are identical. The alternate configuration will also change to use an active antenna as required by the MOPS. Benefit: Characteristic 743A-5 will conform to current certification requirements. Characteristic 743B will provide a new standard for GNSS Primary Means Navigation and GNSS approach (both LPV and GLS) to which the airline customers can refer to for standard form, fit, and function equipment and a low cost alternative to the MMR. Characteristic 743B will provide a new architecture that allows integration of LPV and GLS in a simple and cost-effective manner and be compatible with existing ILS installations. There are over 8000 ARINC 743A GNSSUs in the field. Most of these units do not have GLS capability. The GLSSU will provide a cost effective upgrade path to add the approach function with minimal impact on existing aircraft. Current Drafts:
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Staff ContactDan Martinec |
