Measurement equipment null of the cross polarization degradation primary factor by the radio wave propagation

摘要

PURPOSE:To obtain a simple cross polarized wave compensator with high reliability, by detecting the state of polarization of a system with less effect of nonuniformity of a space of a radio circuit and controlling a cross polarized wave compensator through the addition of correlativity to other systems. CONSTITUTION:A cross polarized wave compensator includes a polarized wave converter and a polarizer and consists of a feeder 9 branching a main polarized wave signal and a cross polarized wave signal, an amplitude phase detector 10 detecting the amplitude ratio and the phae difference between the main polarized wave signal and the cross polarized wave signal, an operation circuit 11 detecting a relative phase difference, a relative attenuation and their slope angle beig the causes to the degrading of polarized waves of a system A based on the detected amplitude ratio and phase difference, an operation circuit 12 generating a control signal of a cross polarized wave compensator 7 for transmission wave through the addition of the correlativity between the relative phase difference and the relative attenuation of the systems A and B, and a controller 13 controlling the compensator 7 based on this control signal. Through the constitution like this, the degrading of an up-link can be obtained through calculation from the deterioration of cross polarization of a down link which can easily be known.