Laser fuze anti-interference method based on pulse width modulation technique

Jing Li; Hao Mei; Chenglin He; Yi Zuo; Luoke Sun

doi:10.3788/IRLA202049.0403007

Journals >Infrared and Laser Engineering >Volume 49 >Issue 4 >Page 0403007 > Article

Infrared and Laser Engineering
Vol. 49, Issue 4, 0403007 (2020)

Laser fuze anti-interference method based on pulse width modulation technique

Jing Li, Hao Mei, Chenglin He, Yi Zuo, and Luoke Sun

Author Affiliations

China Airborne Missile Academy, Luoyang 471009, China

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DOI: 10.3788/IRLA202049.0403007 Cite this Article

Jing Li, Hao Mei, Chenglin He, Yi Zuo, Luoke Sun. Laser fuze anti-interference method based on pulse width modulation technique[J]. Infrared and Laser Engineering, 2020, 49(4): 0403007 Copy Citation Text

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Abstract

In view of the problem that laser fuze is easily interfered by fog and smoke, a new laser fuze anti-interference method based on pulsed width modulation technique was proposed. The fog echo signal power of different pulse width was computed, and the variation of echo signal power under the influence of transmitted pulse duration was given. The echo signal power ratio in different fog and aerosols environment was analyzed by using different pulse width to detect. The experiment results show that by using different pulse width to detect, the ratio of backscattering power is usually more than 3. Therefore, this method can be used to improve anti-interference ability of laser fuze.

Keywords

anti-interference fog laser fuze pulse width modulation

${P_r} = \frac{{{P_t}{\tau _1}{\tau _2}\rho {A_r}}}{{\pi {R^2}}} $

(1)

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$ \begin{split} & p(1) = {e^{ - {\sigma _s}H}} \\ & p(2) = \frac{{S(H)}}{{{H^2}{\varOmega _\Pi }^2}}{\sigma _s}\Delta H \\ & p(3) = f(\theta )\frac{{{S_{BX}}}}{{{H^2}}} \\ & p(4) = {e^{ - {\sigma _s}}} \end{split} $

(2)

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$ \begin{split} p =\; & p(1)p(2)p(3)p(4) = \\ & {\sigma _s}\frac{{{S_{BX}}}}{{{H^2}}}f(\theta )\frac{{S(H)}}{{{H^2}{\varOmega _\Pi }^2}}{e^{ - {\sigma _s}\Delta H}}\Delta H \end{split} $

(3)

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$ \mathop n\limits^ - = \frac{{{P_0}{\tau _n}}}{{hv}} $

(4)

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$ {h_\Pi} = {S_{BX}}f(\theta ){\sigma _s}\frac{{S(H)}}{{4\pi {H^2}\varOmega _\Pi ^2}}{e^{ - {\sigma_s}H}} $

(5)

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$ {P_\Pi }(H) = \int_0^H {{h_\Pi }(R)} {P_{N}}(H - R)\rm{d}R $

(6)

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$ {{P}_{{N}}}(t)={{P}_{0}}{{e}^{{}^{t}\!\!\diagup\!\!{}_{{{\tau }_{n}}}\;}} $

(7)

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$ {P_\Pi }(H) = {P_0}{S_{BX}}f(\theta ){\sigma _s}\int\nolimits_{{H_0}}^H {\frac{{{S_H}(R)}}{{{R^2}}}} {{\rm{e}}^{ - 2{\sigma _s}(R - {H^*}) - {k_m}(H - R)}}{\rm{d}}R $

(8)

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$ {k_m} = \frac{2}{{C{\tau _n}}} $

(9)

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$ \begin{split} & \frac{{P({\tau _n} = 100\;{\rm{ ns}})}}{{P({\tau _n} = 50\;{\rm{ ns}})}} = 1.21 \\ & \frac{{P({\tau _n} = 100\;{\rm{ ns}})}}{{P({\tau _n} = 20\;{\rm{ ns}})}} = 2.12 \\ & \frac{{P({\tau _n} = 100\;{\rm{ ns}})}}{{P({\tau _n} = 10\;{\rm{ ns}})}} = 5.01 \end{split} $

(10)

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Jing Li, Hao Mei, Chenglin He, Yi Zuo, Luoke Sun. Laser fuze anti-interference method based on pulse width modulation technique[J]. Infrared and Laser Engineering, 2020, 49(4): 0403007

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