Abstract: A wide range and high precision frequency estimation algorithm is proposed to solve the problem of small frequency es-timation range of cyclic prefix linear frequency modulated signal in non-cooperative communication. Firstly, the algo-rithm uses the correlation of cyclic prefix to determine the starting point of the symbol; Then, the partial linear fre-quency modulated signal matching correlation is used to determine the time of the zero frequency position in the re-ceived signal, and then uses the time difference between the two to get a wide range of frequency estimation. Finally, the high-precision single frequency estimation algorithm is used to estimate the residual frequency deviation of the matched correlation waveform to improve the accuracy of frequency estimation. Theoretical analysis and simulation results show that the proposed algorithm improves the range of frequency estimation while ensuring the accuracy of es-timation, and is more suitable for non-cooperation communication systems.