Core Avionics Master Plan - NAVAIR - U.S. Navy

Core Avionics Master Plan 2011 Appendix A-4Required Navigational Performance (RNP)–2 above FL 290 in CONUS. (2018) RNPcalls for accuracy of position location on a GPS route to be within a specified number ofnautical miles (nm) of intended position. RNP compliance requires 95% fidelity ofposition accuracy to ensure proper containment for each flight hour for all modes offlight. The GPS receiver must provide Integrity using Receiver Autonomous IntegrityMonitoring (RAIM), ensuring that all of the satellites being utilized to determine positionare operating properly. The Federal Aviation Administration (FAA) will require RNP-2(accurate within two nm) for all operations at or above FL 290 in CONUS (also knownas National Airspace System - NAS) by 2018.ADS-B ‘Out’ in CONUS. (2020) In May of 2010, FAA established the requirement foraircraft operating in high density traffic airspaces in CONUS to be equipped with ADS-B„Out‟ functionality by 2020.Capability Element Evolution:A. Civil Aircraft Traffic Management Interface. This capability elementsection addresses safe traffic separation, with more depth on the CNS/ATM compliancecriteria. It includes information on functionalities provided by avionics components in thecontext that they are used to assist Air Traffic Control (ATC) agencies with cooperativesurveillance of platform status and location.1. Current capabilities.The majority of deployed post-production aircraft utilize voice over VHF radiochannels, IFF Mode 3/A and Mode C signals to communicate with civil ATC. Some IFFsystems use Mode S to overcome issues with Mode 3/A. Once established on a route,aircrew who don‟t have their own radars principally depend upon ATC traffic calls and“See and Avoid” scanning techniques to prevent conflicts or collisions with other traffic.Most civil derivative transports have successfully incorporated commercial CNS/ATMproducts. In recognition of the time, costs and integration challenges, tactical „State‟aircraft (military) were afforded delays for complying with CNS/ATM mandates. A 2001FAA memorandum declared that State aircraft would be accommodated “to the extentpracticable based upon existing traffic and safety considerations.” Non-compliant navalaircraft are now more regularly being excluded from high density airspaces. Solutionshave been designed to certify compliance with CNS/ATM performance requirements. Inthe beginning, compliance elements were individually implemented to meet imposedand impending restrictions. Several platforms have now implemented full scale digitalcockpit replacements.8.33 KHz VHF channel spacing has been accomplished through higher fidelitydigital radio waveforms and radio frequency remapping, primarily in the ARC-210 seriesradios.Protected ILS Filters have been incorporated into ILS receivers to prevent bleedoverinterference (primarily from FM station proliferation and frequency encroachment inEurope).A-4 Cooperative Surveillance 5