A Carrier Frequency Estimation Method of MPSK Signal Based on Rife-Quinn Synthesis

Abstract

The invention discloses a method for estimating the carrier frequency of an MPSK signal based on Rife-Quinn synthesis, comprising the following steps: S10, acquiring the sample data sequence of the MPSK signal to be processed; S20, performing multiple square transformations on the MPSK signal and removing its direct current component, converting the MPSK signal carrier frequency estimation problem into a CW signal frequency estimation problem; S30, using the Rife interpolation algorithm to perform frequency estimation on the CW signal, and when the estimated signal spectrum leakage becomes larger, use the Quinn interpolation algorithm to correct the direction of the Rife interpolation ; S40. Calculate the carrier frequency of the MPSK signal according to the estimated frequency of the CW signal. Compared with the traditional Rife interpolation and Quinn interpolation, the method of the present invention can accurately estimate the carrier frequency of the MPSK signal in the environment of low signal data volume and low signal-to-noise ratio, and is suitable for fast and robust estimation of the carrier frequency of the MPSK signal in engineering .

Description

technical field [0001] The invention belongs to the field of signal processing, in particular to a method for estimating carrier frequency of MPSK signals based on Rife-Quinn synthesis. Background technique [0002] MPSK (Multiple Phase Shift Keying) signal is a multi-ary phase shift keying signal. Due to its good anti-noise performance, this type of signal is widely used in the field of air and underwater communication. Therefore, for non-cooperative MPSK signals Reconnaissance and parameter estimation have important military significance, and the accurate estimation of MPSK signal carrier frequency is the premise that many other signal parameters can be estimated. At present, the commonly used MPSK signal carrier frequency estimation methods mainly include wavelet transform method, spectral correlation method and square transform law etc. [0003] The carrier frequency estimation method based on wavelet transform can estimate the carrier frequency and code rate of the sig...

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Problems solved by technology

The carrier frequency estimation method based on spectral correlation can also estimate the carrier frequency and code rate of the signal at the same time under low signal-to-noise ratio and has strong anti-interference ability, but this method can only directly estimate the carrier frequency of BPSK signal, other The carrier frequency of the MPSK signal needs to be transformed nonlinearly before using this method to estimate the carrier frequency. In addition, the algorithm complexity of calculating the signal spectral correlation function is relatively large. When estimating the signal carrier frequency, it is necessary to estimate the signal carrier frequency on the two-dimensional plane of the spectral correlation function. Searching for spectral peaks further increases the computational complexity of the algorithm, making it difficult to use in engineering practice

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