Patent ID: 7283423

Claim:
A detector base unit specially adapted to a system for position determination of objects in motion and for use in rooms with different kinds of noise, characterised in that it comprises: signal processing means for receiving and sampling several different signals, means for performing the following steps for processing the received data: analog to digital conversion of the sampled signals; transmission to a memory for intermediate storage of digitalised signals; categorisation of the signals in frequency blocks for further processing with Fourier transform for calculation of Doppler shift from the position to the frequency block with the strongest signal; use of line detector for detection of single-frequency noise sources on the different signals, for correcting and providing accepted data; pattern comparison of all bits in order to determine a signature which is characterising for time and Doppler shift; warning to a central unit via a network interface when a sufficient volume of accepted data has been processed and is ready for further processing in the central unit, and transmission of the data to the central unit.