There is described a backscatter system comprised of a base station and of
a completely passive transponder. The transponder is capable of reading
out quantities from sensors and an energy stand-alone manner, of
transmitting the readout quantities to the base station, and to carry out
a runtime-based and thus highly precise distance measurement between a
completely passive tag and base station. The power supply of the
transponder ensues from the radio field emitted by the base station.