METHOD FOR CHARACTERISING PROCESSING DIFFERENCES BETWEEN SEVERAL ANALOG CHANNELS

A method (100) for characterising processing differences between analog channels, the method comprising injecting (102) three analog signals into a first analog channel and a second analog channel, digitising (104) these signals so as to obtain digital signals xk, xl and yl having N samples, estimating (106) parameters γk,l and δk,l from the digital signals, where γk,l is a ratio between an amplitude of the first analog signal at the output of the first analog channel and an amplitude of the second analog signal at the output of the second analog channel, and where δk,l is a difference between a phase shift induced by the first analog channel in the first analog signal and a phase shift induced by the second analog channel in the second analog signal,the estimation comprising the application of a least squares method in order to determine values of the parameters γk,l and δk,l minimising the following quantity:∑n=1N(xk(n)-γk,l(cos⁡(δk,l)⁢xl(n)-sin⁡(δk,l)⁢yl(n)))2