Abstract
In a smoke environment, suspended particles can scatter and absorb laser photons, making target echo signals extremely weak and difficult to extract and identify, which causes obvious difficulty in fixed-distance of laser fuze. In this paper, the multiple scattering model of frequency-modulated-continuous-wave (FMCW) laser fuze in a smoke environment was established. This model simulates multi-path propagation and multiple scattering of photons. At the same time, we use the correntropy spectral density (CSD) algorithm for accurate fixed-distance of FMCW laser fuze. The absolute error of distance does not exceed 0.15 m in smoke interference environment.
Highlights
Fixed-distance fuze is a device that measures the distance to the target by radio, laser, ultra-wideband, millimeter wave, and detonates the warhead at the best explosive point
The frequency modulated continuous wave (FMCW) laser ranging system depends on the beat frequency instead of the magnitude and time of the echo signal so that it has a natural advantage in target detection under dense fog conditions [3,4]
Zhang et al studied the characteristics of smoke backscatter interference signals of FMCW laser fuze, and proposed a method for detecting intermediate frequency signals based on a normalized threshold [7,8]
Summary
Fixed-distance fuze is a device that measures the distance to the target by radio, laser, ultra-wideband, millimeter wave, and detonates the warhead at the best explosive point. Zhang et al studied the characteristics of smoke backscatter interference signals of FMCW laser fuze, and proposed a method for detecting intermediate frequency signals based on a normalized threshold [7,8]. Some traditional denoising methods, including empirical mode decomposition (EMD) direct wavelet thresholding, EMD interval thresholding, correlation-based EMD partial reconstruction, discrete Fourier transform (DFT), and wavelet transformation, are investigated to provide a comparison with the cross-power-spectral-density (CPSD) algorithm [10]. Both the simulation and experiment results showed that the CPSD algorithm has better performance than other algorithms for the anti-interference of FMCW laser detection.
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