Abstract
This chapter discusses three different telemetry systems, which differ from standard telemetry systems. The telemetry system includes ocean data telemetry, physiological telemetry, and vehicle ID information. The main advantage of telemetry systems, as applied to ocean data, is the ability to access the data in real time, for operational and forecasting purposes. An approach is to use an inductive modem approach to transmit data from the remote instruments. This offers a low cost approach to acoustic or cable systems although the energy efficiency is low. The single chip modems used for the telecommunication environment are appropriate for inductive applications as the insulated steel mooring wire immersed in salt water has attenuation versus frequency response quite similar to twisted pair telephone cable. The tag identification system using modulated ultra-high frequency backscatter is elaborated. There are various approaches open to using some form of radio system to transmit the unique data contained on the tag. This could be a radio transmitter embedded in the tag, actively transmitting to a radio receiver. It is observed that high frequency or far field radio frequency tag systems use antennas such as dipoles, dipole arrays or horns with ranges much larger than the antenna dimensions.
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