Patent ID: 7391360
Filing Date: 2008-06-24
Classification: G01S

Abstract:
1. A method for locating a detection microchip that transmits a detection signal, which is received and evaluated by a reader, comprising determining the current distance between the reader and the detection microchip from a run-time-dependent characteristic of the received detection signal and propagation speed of electromagnetic waves, wherein: the phase angle of the detection signal is evaluated as the run-time-dependent characteristic of the received detection signal, a reference detection microchip is disposed at a reference distance from the reader in the vicinity of the detection microchips to be identified, wherein correction value for the reference distance is determined by comparing the measured phase angle to a reference phase angle, and the measured phase angle of the detection microchip to be identified is corrected with the correction value; and multiple distance measurements are carried out at no less than two different antenna positions of the reader or a plurality of readers and the position of the detection microchip is determined from the intersection points of the distance position curves of the antenna positions of the reader or readers.