Study of time-varying velocity measurement using self-mixing laser diode by polynomial phase parameter estimation method

Time-varying velocity measurement by self-mixing laser diode is explored. A signal processing based on polynomial phase parameter estimation is presented. Based on the principle of self-mixing laser diode velocity measurement, the laser diode output's polynomial phase expressions is deduced when the self-mixing laser diode is used to measure time-varying velocity. Namely, a model is proposed for the simulation of time-varying velocity measurement. At last, the signal processing based on polynomial phase is used to obtain target's velocity and acceleration, and the simulation results are presented. The simulation results show that even when the signal-to-noise ratio(SNR) is -21dB, the comparative error of target's velocity and acceleration parameter is 1.56% and 0.03% respectively. The simulation results prove the validity of the algorithm even in the situation of low SNR.