5.13. Regulations for RAAS ...................................................................... 5-33
5.14. Manufacturer for RAAS.................................................................... 5-33
5.15. Future Systems ............................................................................... 5-33
6. WEATHER SURVEILLANCE......................................................................... 6-1
6.1. Description of Weather Radar ........................................................... 6-3
6.1.1. Radar Theory..................................................................................... 6-3
6.1.1.1. Reflectivity of Water Molecules..............................................................6-3
6.1.1.2. Reflectivity of Thunderstorms................................................................6-4
6.1.1.3. Frequency Band..................................................................................6-5
6.1.1.4. Gain..................................................................................................6-5
6.1.1.5. Antenna.............................................................................................6-6
6.1.1.6. Radar Beam .......................................................................................6-7
6.1.1.7. Interfering Radio Transmitters............................................................. 6-11
6.1.1.8. Radiation Hazards ............................................................................. 6-11
6.1.2. Weather, Turbulence and Wind Shear Detection ............................. 6-12
6.1.2.1. Coverage ......................................................................................... 6-12
6.1.2.2. Wind Shear Detection ........................................................................ 6-13
6.1.3. Weather Radar Operating Modes..................................................... 6-13
6.1.3.1. WX Mode ......................................................................................... 6-13
6.1.3.2. WX+T, WX/TURB or TURB Mode .......................................................... 6-13
6.1.3.3. MAP Mode ........................................................................................ 6-14
6.1.3.4. PWS Mode........................................................................................ 6-14
6.1.4. Reactive Wind Shear ....................................................................... 6-16
6.1.5. Weather Radar Functions per Manufacturer .................................... 6-16
6.1.5.1. Autotilt (Honeywell)........................................................................... 6-17
6.1.5.2. Multiscan (Rockwell Collins) ................................................................ 6-18
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