| http://www.w3.org/ns/prov#value | - Doppler shifting may occur because one of the radio units is moving with respect to the other, for example a base station may be mobile whereas the local transmitters connected to geophones are stationary, or because one or both the base station and remote units are moving with respect to the transmission media, as happens in marine seismic surveying whereby the hydrophones may be towed by a surve
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