Fast Parameter Estimation of LFM-PRBC Signal under Low SNR
Sifeng Liu · Telecommunication Engineering · 2014
To solve the problem that the parameter estimation of linear frequency modulation- pseudo random binary codes(LFM- PRBC) signal requires a large amount of computation in current algorithms,a fast parameter estimation algorithm which uses dechirp and fractional Fourier transform( FRFT) is proposed.Firstly,the dechirp is used to obtain the rough estimation of chirp rate which can determine the angle of rotation,and the rough estimation of symbol width is achieved by FRFT. And then,the exact value of chirp rate is estimated from the second dechirp based on the delay of the signal. Finally,through the second FRFT the exact value of symbol width and the initial frequency are obtained. The proposed algorithm has not only low computation complexity but also high estimation accuracy and strong ability of immunity to noise.The effectiveness of this algorithm is verified by simulation.