METHOD AND MEASURING DEVICE FOR INTERMODULATION MEASUREMENT

摘要

A method for intermodulation measurement for locating points in a signal transmission path for a high-frequency signal that are faulty with regard to HF transmission properties of the signal transmission path, by generating a first HF signal uTest, having a carrier frequency f1 and a digital signal uCode modulated thereon; generating a second HF signal u2 having a frequency f2; introducing the first HF signal uTest and the second HF signal u2 into the signal transmission path at a predetermined introduction point; receiving an intermodulation product, which is generated in the signal transmission path from the first HF signal and the second HF signal at at least one faulty point, as an intermodulation product signal uRX; recovering a digital signal udemod from uRX; and determining a time shift tx between the digital signal uCode and the recovered digital signal udemod. The invention further relates to a measuring device for performing this method.

主权项

1. A method for locating points in a signal transmission path for a radio-frequency signal which is faulty with regard to radio-frequency transmission properties of the signal transmission path, wherein a first RF signal uTest which has a carrier frequency f1 is generated, said method comprising:
(a) modulating a digital signal uCode onto the first RF signal uTest; (b) generating a second RF signal u2 having a frequency f2; (c) introducing the first RF signal uTest and the second RF signal u2 into the signal transmission path at a predetermined introduction point; (d) receiving an intermodulation product, which is generated in the signal transmission path from the first RF signal and the second RF signal at at least one faulty point and reflected back to the introduction point, in the form of an intermodulation product signal uRX; (e) recovering a digital signal udemod from the intermodulation product signal through modulation; (f) determining a time shift tx between the digital signal uCode and the recovered digital signal udemod; and (g) calculating the length L between the introduction point and the point in the signal transmission path at which the signal received in step (d) was generated from the time shift tx determined in step (f).