ACR Electronics RLB-33S - REV D Product Support Manual

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ACR Electronics RLB-33S - REV D Product Support Manual Manual pdf 17 page image

Y1-03-0180 Rev. D14carriers followed by a digital message format that provides identification data. The 406 MHz system usesSatellite-borne equipment to measure and store the Doppler-shifted frequency along with the beaconsdigital data message and time of measurement. This information is transmitted in real time to an earthstation called the Local User Terminal (LUT), which may be within the view of the satellite, as well as beingstored for later transmission to other LUTs.The LUT processes the Doppler-shifted signal from the LEOSAR and determines the location of thebeacon; then the LUT relays the position of the distress to a Mission Control Center (MCC) where thedistress alert and location information is immediately forwarded to an appropriate Rescue CoordinationCenter (RCC). The RCC dispatches Search and Rescue (SAR) forces.The addition of the GEOSAR Satellite system greatly improves the reaction time for a SAR event. Thissatellite system has no Doppler capabilities at 406 MHz, but will relay the distress alert to any of the LUTstations. When there is GPS data included in the distress message, SAR authorities instantly know yourlocation to within 110 yards. This speeds up the reaction time by not having to wait for one of the LEOSARsatellite to pass overhead. Because most of the search and rescue forces presently are not equipped tohome in on the 406 MHz Satellite beacons signal, homing must be accomplished at 121.5 MHz.6.3 Global Positioning System (GPS)The GPS system is a satellite group that enables a GPS receiver to determine its exact position to within30m anywhere on Earth. With a minimum of 24 GPS satellites orbiting the Earth at an altitude ofapproximately 11,000 miles they provide users with accurate information on position, velocity, and timeanywhere in the world and in all weather conditions. The ThunderBird SSAS stores this data into itsdistress transmission allowing search and rescue forces to narrow the search into a very small area andthus minimize the resources required and dramatically increases the effectiveness of the overall operation.FIGURE 8 - SATELLITE COVERAGE FIGURE 9 - GEOSAR SATELLITE ORBITSFIGURE 10 - GPS SATELLITE ORBITS