METHOD AND SYSTEM FOR DETERMINING THE ORIGIN OF PASSIVE INTERMODULATION PRODUCTS

摘要

The invention relates to a method for determining the origin of a passive intermodulation product, wherein a distributed object (1) under test is excited with two first excitation signals ( x1 (t), x2 (t) ), each having a single spectral line, and the frequencies (f 1 , f 2 ) of which exhibit a frequency spacing (?f) from each other. The phase (f IM3Mess ) of a first passive intermodulation product generated at the origin in the distributed object (1) under test by non-linear distortion from the first excitation signals ( x1 (t), x2 (t) ) is measured and the propagation time (?t) of the first passive intermodulation product from the origin to the measuring instrument (5) is calculated from the measured phase( x1 (t), x2 (t) ) and the frequency (2 ° f 1 - f­2­)of the first intermodulation product. Finally, the origin of the passive intermodulation product is determined from the propagation time (?t) and the topology of the distributed object (1) under test.