RADIO-BASED POSITIONING PROCESS WITH A HIGHLY PRECISE DELAY IN THE TRANSPONDER

摘要

The invention relates to a novel system for measuring short distances using the propagation time of radio, sound, or light signals between at least one request unit and a transponder. An interference with the response signal of the transponder due to the request signal is eliminated by means of a highly precise delay of the request in the transponder. The delay is implemented with the required degree of precision with crystal accuracy in that the delay is carried out in a digital or analog register line, the register clock of which is kept in phase synchronization with the request signal such that the request signal is variably delayed in the request unit, and the delay is adapted using the detectable jump of the total propagation time, i.e. round trip, by a register clock period at the synchronization time preferably using a binary search.