Study on the frequency-modulation phase-shift laser ranging technique in laser fuzing applications

A frequency-modulation phase-shift laser ranging technique was proposed in order to improve the distance measurement resolution, real-time ability and reduce the complexity of system realization in laser fuzing applications. A method of sine wave frequency-modulation phase-shift range finding was employed. The operating principle of the frequency-modulation phase-shift laser ranging technique was analyzed and the main influencing factors on the distance measurement resolution was pointed out. The Hilbert transform was employed to improve the precision of phase measurement and the simulations were made for verification. The simulation results show that under a 14 dB signal to noise ratio condition the distance measurement resolution is higher than 0. 1 m and a good real-time ability is achieved which makes this technique properly apply to laser proximity fuzing.