Method of measuring frequency difference, and receiver

摘要

A method of measuring the frequency difference between a tuning frequency and a transmission frequency is provided. The method includes generating temporally successive estimated impulse responses and comparing the mutual temporal shift of the impulse responses in relation to one another. Additionally, the method includes generating a phase shift between the impulse responses corresponding to the comparison and forming a frequency difference between the transmission frequency and the tuning frequency corresponding to the phase shift. As the estimated impulse responses are generated in succession at given intervals and as the signal is being sampled at a given sampling frequency, the phase shift is generated corresponding to the highest correlation value. The frequency difference between the transmission frequency and the tuning frequency is formed as the ratio of the product of the phase shift and the tuning frequency to the product of the measurement interval and the sampling frequency.