Radio Frequency Interference
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1 Radio Frequency Interference Regional Preparatory Workshop for WRC-15 Lima, Peru March 12, 2013 Mike Biggs Senior Engineer US FAA Spectrum Engineering Services
2 What is Radio Frequency Interference (RFI)? ITU Definition: The effect of unwanted energy due to one or a combination of emissions, radiations, or inductions upon reception in a radiocommunication system, manifested by any performance degradation, misinterpretation, or loss of information which could be extracted in the absence of such unwanted energy. Criteria to mitigate inter-system interference are established as an element of ICAO SARPs. E.g., 8 db D/U for co-channel DME assignments 2
3 US RFI Yearly Activity Statistics Maintenance Management System (MMS) Data Event Manager System (EMS) Data Spectrum RFI Tracking System (RFIT) Data 3
4 RFI Categories Authorized Transmissions Properly Licensed (i.e. FM, AM, TV) Unauthorized Transmissions Wireless Video Cameras High Power Cordless Telephones Unlicensed Pirate FM Stations Spurious Intentional Unauthorized Jamming Phantom Controllers Unintentional Spurious Transmissions 4
5 RFI Sources Citizens Band (CB) Radios (5 th harmonic) Paging Systems Stuck Microphone Transmissions Cell phone Spurious Emissions Electronic Attack (EA) Missions Power line Noise (Broadband Noise) Anomalous Propagation Atmospheric Conditions Amateur HAM Radio Land Mobile/Dispatch 5
6 US National Airspace System RFI Most Common Source of RFI: Unauthorized Transmissions Pirate FM Broadcast Spurious Most Common FAA Victim: VHF/UHF Voice Communications Most Difficult RFI to Resolve: High Altitude Pilot Only Reported RFI Intermittent RFI (Airborne/Ground) Broadband RFI on Many Frequencies Phase Shift Keying RF Transmissions 6
7 US RFI Investigation Resources FAA Personnel and Organizations: ATO Spectrum Engineering Services Headquarters Technical Center Command Center Frequency Management Officers (FMO) Technical Operations Service Areas Aeronautical Center Technical Support Field Specialists (Technicians) Aviation System Standards (Flight Inspection) One International FIO Six National FIOs 7
8 RFI Investigation Resources FAA Assets and Software Tools Radio Frequency Interference Monitoring (RFIM) Vans Automated or Manual Full Equipment Suite DF Control/Mapping MHz Regional Used mainly by FMOs Most Complete Measurement System 8
9 Portable DF (RFID) Regional Automated Vehicle mounted mobile DF Detection Band MHz 29 RFID Systems GPS DF Antenna L MHz 9
10 Handheld DF (K95-103) Regional System Management Office (SMO) 33 Offices in the NAS K Detection Coverage MHz Typically 2 miles Regional Most Cost effective First choice instrument for technicians Approx. 300 K Systems GPS DF Antenna L1,L2,L5 VHF Yagi Antenna Directional 10
11 Airborne DF AVN Flight Check NASE/RFI Program to assist in locating RFI/GPS sources First Choice when High Altitude PIREPS ONLY DF Control/Mapping Operated Automation GPS DF Array & VHF DF Array L1,L2,L5 & MHz 11
12 National RFI Initiative FAA Assets and Software Tools Los Angeles (LAX), Chicago (ORD), New York (JFK), Miami (MIA) FAA Intranet Web based Graphical User Interface (GUI) Web Browser Control of Fixed DF and Spectrum Analyzer Chicago NIMDS New York NIMDS Los Angeles NIMDS Master IMDS Miami NIMDS 12
13 Interference Monitoring Detection System (IMDS) WEB IMDS Receiver Tuned Frequency DF Processor Bearing Averaging Triangulation Multiple Audio Playback Capability Synchronized Spectrum Analyzer Spectral View 13
14 Mapping Triangulation WEB IMDS Triangulated Bearing Averages Overlay on Map Increases Fix Calculation Ellipse Accuracy Multiple Ellipse Calculation for Smaller Ellipse 14
15 Flight Explorer ASD Aircraft Situation Display (ASD) Traffic Flow of potential aircraft PIREPS RLOS Footprint Lowest Aircraft Altitude VENN Diagram Overlay Area 15
16 Audio Spectrogram Analysis Audio Detection Visual Intensities Used for Matching with known sources Audio Spectral Views 16
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