Adaptive cross correlator apparatus comprising adaptive controller for adaptively adjusting transfer functions of two filters

摘要

In an adaptive cross correlator apparatus, a first receiving section receives a signal and outputs the received signal as a first signal, and a second receiving section receives a further signal and outputs the received further signal as a second signal, wherein the second receiving section is provided at a position different from that of the first receiving section. A first filter filters the first signal with a first changeable transfer function and outputs a filtered first signal, and a second filter filters the second signal with a second changeable transfer function and outputs a filtered second signal. Further, a cross correlator calculates a cross correlation value by using a predetermined cross correlation function based on the filtered first and second signals, and then, an adaptive controller calculates a discriminant function value representing a misclassification measure of the first and second signals, based on the cross correlation value and a true delay between the first and second signals, and adaptively adjusts the respective first and second transfer functions of the first and second filters so that the calculated discriminant function value becomes a minimum.