Measurement of Voltage Standing Wave Ratio of Antenna System

摘要

The present invention provides methods and apparatus to detect the presence of interferers in a wideband digital VSWR measurement signal. Interferers cause power differences over different intervals of time and frequency, and may be detected by comparing the measured signals in both time and frequency domains with the original signal. Frequency components in the measured signals may be discarded if the interference is deemed too large. The remaining frequency components can then be used to compute the VSWR.

主权项

1. A measurement circuit for measuring a voltage standing wave ratio (VSWR) in an antenna system, the measurement circuit comprising:
a directional coupler connected between a transmitter and an antenna; a receiver circuit to generate measurement signals for forward and reflected signals in a transmission line of the antenna system; and a processing circuit configured to:
compute reflection coefficients for a plurality of frequency bins based on the measurement signals;detect interference in one or more of the frequency bins based on the reflection coefficients;discard reflection coefficients for one or more frequency bins in which interference has been detected; andcompute the VSWR of the antenna system based on the reflection coefficients for the remaining frequency bins.