A Fast and Accurate Frequency Acquisition Method

To aim at short-time pilot pulse carrier- frequency synchronization, a ,fast and accurate acquisition method is proposed. The method employs phase deduction frequency estimator (PDFE) and digital down conversion loop to perform initial and accurate frequency acquisition. The PDFE estimation accuracy exceeds Prony´ s method. Its estimation error normalized variance approaches the Cramer-Rao bound of real sinusoid signal at high signal-to-noise ratio. A Simulink simulation model of accurate frequency acquisition loop was established to verify the acquisition accuracy. An example is given, the maximum acquisition error is not more than 2.2 Hz at input SNR above 13 dB.