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查冰婷 , 徐光博 , 秦建新 , 等 . 多发多收周视激光引信时刻鉴别方法 [J ] . 兵工学报 , 2024 , 45 ( 11 ): 4145 - 4154 . DOI: 10.12382/bgxb.2023.0948 http://doi.org/10.12382/bgxb.2023.0948 难以区分后向散射信号和目标回波信号是影响引信探测精度的重要因素。此外,当回波信号处于饱和状态时常规时刻鉴别电路失效。根据烟尘环境下激光探测回波信号的特点,提出一种基于多发多收激光引信的全波形采样时刻鉴别算法,以有效提取目标回波信号,并完成激光测距计时终点的选择。为抑制噪声干扰并保留原始回波信号的主要波形特征,对回波信号进行滤波和阈值截取的预处理,并在预处理后信号的基础上采用特征提取法,以特征信号的形状特征代替原始回波信号的形状特征。为验证算法的可行性,针对激光探测中三类回波信号进行试验。试验结果表明:新算法能够有效识别出三类回波信号,并针对不同的回波信号计算最佳回波返回时刻,有效提高了时刻鉴别的精度。

ZHA B T , XU G B , QIN J X , et al . Time discrimination method of multi-transmitter and multi-receiver circumferential laser fuze [J ] . Acta Armamentarii , 2024 , 45 ( 11 ): 4145 - 4154 . (in Chinese) DOI: 10.12382/bgxb.2023.0948 http://doi.org/10.12382/bgxb.2023.0948 It is difficult to distinguish backscattering signal from target echo signal, which is an important factor affecting the detection accuracy of fuze. In addition, when the echo signal is saturated, the conventional time discrimination circuit fails. According to the characteristics of laser echo signal in smoke and dust environment, a full-waveform sampling time discrimination algorithm based on multi-transmitter and multi-receiver laser fuze is proposed to effectively extract the target echo signal and complete the selection of laser ranging timing end point. In order to suppress the noise interference and keep the main waveform characteristics of the original echo signal, the echo signal is preprocessed by filtering and threshold interception, the feature extraction method is adopted based on the preprocessed signal, and then the shape characteristics of the characteristic signal are replaced by those of the original echo signal. Three kinds of echo signals in laser detection are tested to verify the feasibility of the proposed algorithm. The experimental results show that the proposed algorithm can effectively identify three types of echo signals, and calculate the best echo return time for different echo signals, which effectively improves the accuracy of time discrimination.

XU C Y S , ZHA B T , BAO J Q , et al . Analysis of temporal and spatial distribution characteristics of ammonium chloride smoke particles in confined spaces [J ] . Defence Technology , 2022 , 18 ( 7 ): 1269 - 1280 . DOI: 10.1016/j.dt.2021.09.017 http://doi.org/10.1016/j.dt.2021.09.017 In response to the demand for short-range detection of anti-smoke environment interference by laser fuzes, this study proposes a smoke environment simulation of non-uniform continuous point source diffusion and investigates an experimental laboratory smoke environment using an ammonium chloride smoke agent. The particle size distribution, composition, and mass flow distribution of the smoke were studied. Based on a discrete phase model and a k-ε turbulence model, a numerical simulation was developed to model the smoke generation and diffusion processes of the smoke agent in a confined space. The temporal and spatial distribution characteristics of the smoke mass concentration, velocity, and temperature in the space after smoke generation were analyzed, and the motion law governing the smoke diffusion throughout the entire space was summarized. Combined with the experimental verification of the smoke environment laboratory, the results showed that the smoke plume changed from fan-shaped to umbrella-shaped during smoke generation, and then continued to spread around. Meanwhile, the mass concentration of smoke in the space decreased from the middle outward; the changes in temperature and velocity were small and stable. In the diffusion stage (after 900 s), the mass concentration of smoke above 0.8 m was relatively uniform across an area of smoke that was 12 m thick. The concentration decreased over time, following a consistent decreasing trend, and the attenuation was negligible in a very short time. Therefore, this system was suitable for conducting experimental research on laser fuzes in a smoke environment. Owing to the stability of the equipment and facilities, the setup could reproduce the same experimental smoke environment by artificially controlling the smoke emission of the smoke agent. Overall, this work provides a theoretical reference for subsequent research efforts regarding the construction of uniform smoke environments and evaluating laser transmission characteristics in smoky environments. © 2021 China Ordnance Society

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