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GEOSAR satellites
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Geostationary orbit search and rescue (GEOSAR) and low earth orbit search and rescue (LEOSAR) satellites. (Courtesy of Cospas-Sarsat Secretariat.)
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relative motion the wavelength is lengthened and therefore the received frequency decreased. It should be kept in mind that the radio-beacon emits a constant frequency, and the electromagnetic wave travels at constant velocity, that of light. Denoting the constant emitted frequency by f0, the relative velocity between satellite and beacon, measured along the line of sight as v, and the velocity of light as c, then to a close approximation the received frequency is given by (assuming v c): f Q1 v c Rf0 (1.1)
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The relative velocity v is positive when the line of sight distance is decreasing, (satellite and beacon moving closer together) and negative when it is increasing (satellite and beacon moving apart). The relative velocity v is a function of the satellite motion and of the earth s rotation. The frequency difference resulting from the relative motion is f The fractional change is f f0 v c (1.3) f f0 v c f0 (1.2)
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When v is zero, the received frequency is the same as the transmitted frequency. When the beacon and satellite are approaching each other, v is positive, which results in a positive value of f. When the beacon and satellite are receding, v is negative, resulting in a negative value of f. The time at which f is zero is known as the time of closest approach. Figure 1.9 shows how the beacon frequency, as received at the satellite, varies for different passes. In all cases, the received frequency goes from being higher to being lower than the transmitted value as the satellite approaches and then recedes from the beacon. The longest record and the greatest change in frequency are obtained if the satellite passes over the site, as shown for pass no. 2. This is so because the satellite is visible for the longest period during this pass. Knowing the orbital parameters for the satellite, the beacon frequency, and the Doppler shift for any one pass, the distance of the beacon relative to the projection of the orbit on the earth can be determined. However, whether the beacon is east or west of the orbit cannot be determined easily from a single pass. For two successive passes, the effect of the earth s rotation on the Doppler shift can be estimated more accurately, and from this it can be determined whether the orbital path is moving closer to, or moving away from the beacon. In this way, the ambiguity in east-west positioning is resolved. The satellite must of course get the information back to an earth station so that the search and rescue operation can be completed, successfully one hopes. The SARSAT communicates on a
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Overview of Satellite Systems
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Showing the Doppler shift in received frequency on successive passes of the satellite. ELT emergency locator transmitter.
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downlink frequency of 1544.5 MHz to one of several local user terminals (LUTs) established at various locations throughout the world. In the original Cospas-Sarsat system, the signal from the emergency radio beacons was at a frequency of 121.5 MHz. It was found that over 98 percent of the alerts at this frequency were false, often being caused by interfering signals from other services and by inappropriate handling of the equipment. The 121.5-MHz system relies entirely on the Doppler shift, and the carrier does not carry any identification information. The power is low, typically a few tenths of a watt, which limits locational accuracy to about 10 to 20 km. There are no signal storage facilities aboard the satellites for the 121.5-MHz signals, which therefore requires that the distress site (the distress beacon) and the LUT must be visible simultaneously from the satellite. Because of these limitations, the 121.5-MHz beacons are being phased out, and the 121.5-MHz service will terminate on February 1, 2009. Cospas-13, planned for launch in 2006, and Sarsat14, planned for launch from 2009, will not carry 121.5-MHz beacons. However, all Cospas-Sarsat satellites launched prior to these will carry the 121.5-MHz processors. (Recall that Sarsat-7 is NOAA-15, Sarsat-8 is NOAA-L, Sarsat-9 is NOAA-M, and Sarsat-10 is NOAA-N.)
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