Wu Kaiwei, Yang Bing, Hao Shijun, Liang Yanbin, Huang Zhonghua
School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China.
Entropy (Basel). 2024 Jul 17;26(7):605. doi: 10.3390/e26070605.
The increasingly complex electromagnetic environment of modern warfare and the proliferation of intelligent jamming threaten to reduce the survival rate of radio fuzes on the battlefield. Radio frequency (RF) stealth technology can fundamentally improve the anti-interception and reconnaissance capabilities of radio fuzes, thereby lessening the probability of them being intercepted, recognized, and jammed by the enemy. In this paper, an RF stealth waveform based on chaotic pulse-position modulation is proposed for ultra-wideband (UWB) radio fuzes. Adding a perturbation signal based on the Tent map ensures that the chaotic sequences have sufficiently long periods despite hardware byte limitations. Measuring the approximate entropy and sequence period shows that the Tent map with the addition of perturbation signals can maintain good randomness under byte constraints, closely approximating the Tent map with ideal precision. Simulations verify that the proposed chaotic mapping used to modulate the pulse position of an ultra-wideband radio fuze signal results in superior detection, anti-interception, and anti-jamming performance.
现代战争中日益复杂的电磁环境以及智能干扰的激增，有可能降低战场无线电引信的生存率。射频（RF）隐身技术可从根本上提高无线电引信的抗截获和侦察能力，从而降低其被敌人截获、识别和干扰的概率。本文针对超宽带（UWB）无线电引信，提出了一种基于混沌脉冲位置调制的射频隐身波形。基于帐篷映射添加扰动信号，可确保混沌序列在硬件字节限制下仍具有足够长的周期。对近似熵和序列周期的测量表明，添加扰动信号后的帐篷映射在字节约束下能保持良好的随机性，与理想精度的帐篷映射非常接近。仿真验证，所提出的用于调制超宽带无线电引信信号脉冲位置的混沌映射，具有卓越的探测、抗截获和抗干扰性能。
