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"Doug Ventura" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] > > > > > I understand that the positional inaccuracies of a skywave radar can > > be partially overcome by the use of active beacons, which allow good > > _relative_ targeting data, or absolute data if the beacon is static > > and on a premapped position. > > > > Gimme a break. Beacons only help when targets are cooperating (i.e. have > the beacon and are radiating it..) Having a beacon on the AWD is only > going to improve the precision of the AWD track, as seen by Jindalee... The relative accuracy of OTHR tracks is superior to its ability to resolve absolute position. If there is a beacon with a known location, this can use used to increase the absolute positional accuracy of the other tracks in the region. Clearly, the closer the other tracks are to the known track, the better, as the ionospheric variations increase as the separation increases. regards, Mark
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