Parameter Estimation of BPSK and QPSK Signals Based on IFM

According to the problem that instantaneous frequency measurement( IFM) of RWR /ESM system is unable to measure parameters of phase coded signals,a method for estimating carrier frequency and two methods for estimating code element are proposed. Through sampling with high sampling rate ADC,resolving ambiguity,excluding phase jump punctuation and averaging,carrier frequency is obtained. By making use of two estimation methods based on phase jump and coherent demodulation,code element is estimated. Simulation results show that those methods are efficient to estimate carrier frequency and code element. Estimation method based on phase jump of code element is good in real time,but needs transcendental information. Coherent demodulation is opposite. The conclusions have reference value for the engineering and study.