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准连续波雷达信号分析 总被引:2,自引:0,他引:2
准连续波雷达是一种新的雷达技术,具有截获概率低、抗干扰能力强、电磁兼容性好的优点,近年来引起了广泛的关注。本文分析了准连续波雷达的几种信号形式.研究了准连续波雷达信号的模糊函数,讨论了不同信号的距离遮挡损失、距离和多普勒旁瓣等特性.对信号的特性进行了讨论. 相似文献
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连续波(CW)雷达没有近距离盲区,但存在近距离信号泄漏和目标强回波干扰问题,严重影响雷达的探测性能。针对该问题,提出了一种基于单频调频信号的贝塞尔函数曲线特性进行近距离信号抑制的方法。首先建立了调频发射信号回波及I、Q解调数学模型,推导了调频信号的贝塞尔函数曲线特性;其次阐述了如何选择合适的调频频率和调频指数,能够更好的解决近距离干扰问题;最后,针对设置的参数进行仿真,结果表明该方法有效。 相似文献
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准连续波雷达在炮兵雷达中的应用 总被引:1,自引:0,他引:1
文章提出一种新的雷达体制-准连续波雷达。它采用连续波测量原理,又采用最大时间压缩比的脉冲体制,因而既有连续波雷达低截获概率的优点、又有脉冲雷达收发时间隔离的特点,。该雷达作用距离可达上百公里。该体制已获国防科技专利发明证书。 相似文献
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低截获概率准连续波雷达 总被引:2,自引:0,他引:2
本文讨论了低截获概率雷达在现代战争中的作用,提出了提高雷达生存能力的各种途径,着重分析了新型连续波雷达体制-低截获概率准连续波雷达的基本原理和特点。 相似文献
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基于PWHT的LFM-PRBC雷达信号截获与特征提取 总被引:1,自引:0,他引:1
线性调频-伪随机二相编码调相复合调制雷达信号(LFM-PRBC)融合了两者的优点,弥补了单一信号的不足,是一种性能较好的低截获概率雷达信号,给传统雷达截获接收机带来挑战。提出了将周期Wigner Hough变换(PWHT)与相关检测相结合的方法,通过在信号的周期WignerHough域搜索峰值,检测复合调制雷达信号并实现其特征提取。通过理论分析和计算机仿真验证,该方法能实现高斯白噪声背景下低信噪比复合调制信号的截获与特征提取。 相似文献
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连续波体制雷达由于是全占空比工作,发射功率很低,使其具有一定的低截获概率性能;连续波雷达扩谱容易,易于实现高距离分辨;同时该体制雷达具有无距离盲区、时宽带宽积大等特点,正是由于这些不同于普通脉冲体制雷达的特点,近年来,随着理论和器件水平的提升,连续波体制雷达越来越受到大家的广泛重视.但是,连续波雷达由于体制的原因,使其存在一些关键性的技术问题,如收发隔离、距离速度耦合、大距离动态范围压缩等,本文着重分析了线性调频连续波雷达距离动态压缩问题,提出了解决办法,给出了试验结果. 相似文献
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Radar network can offer significant performance improvement for target detection and information extraction employing spatial diversity. For a fixed number of radars, the achievable mutual information (MI) for estimating the target parameters may extend beyond a predefined threshold with full power transmission. In this paper, an effective low probability of intercept (LPI) optimisation algorithm is presented to improve LPI performance for radar network. Based on radar network system model, we first provide Schleher intercept factor for radar network as an optimisation metric for LPI performance. Then, a novel LPI optimisation algorithm is presented, where for a predefined MI threshold, Schleher intercept factor for radar network is minimised by optimising the transmission power allocation among radars in the network such that the enhanced LPI performance for radar network can be achieved. The genetic algorithm based on nonlinear programming (GA-NP) is employed to solve the resulting nonconvex and nonlinear optimisation problem. Some simulations demonstrate that the proposed algorithm is valuable and effective to improve the LPI performance for radar network. 相似文献
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Low probability of intercept (LPI) radar signal design is a very important issue on modern battlefield. Different phase coding technologies are used to modulate Costas frequency hop sequence, and five kinds of continuous wave radar signals including Costas, Costas_qbarker, Costas_frank16, Costas_px16 and Costas_zadoff-chu13 are proposed and designed in this paper. The target resolution and LPI performance of the Costas and Costas/PSK continuous wave radar signals are analysed and compared. The ambiguity function and power spectral densities (PSDs) of five different kinds of signals are also simulated and studied. The results show that the target resolution and LPI performance of proposed Costas/PSK signal are better than Costas signal. 相似文献
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低截获概率雷达的广泛应用导致电子侦察系统截获到的雷达信号大多处于低信噪比环境中。针对目前雷达信号参数估计算法在此环境中性能急剧下降,甚至失效的问题,提出一种基于多相滤波器组和高阶累积量联合处理的对称三角线性调频连续波信号参数估计算法。该算法利用多相滤波器组实现信号在频域上的快速均匀划分,对输出的每个子带信号进行三阶累积量对角切片的短时估计,有效抑制了高斯噪声的干扰,并经过包络检波后得到信号完整的时频矩阵,通过对时频图像进行Radon变换得到信号带宽、周期以及调频斜率的估计,频率曲线的提取得到信号起止频率的估计。仿真结果表明:方法在信噪比大于-12dB时的估计正确率较高。 相似文献
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Garrett Vanhoy Thomas Schucker Tamal Bose 《Analog Integrated Circuits and Signal Processing》2017,91(2):305-313
In modern radar systems, low probability of intercept (LPI) waveforms are used to make detection by a potential adversary difficult. This is accomplished using wideband waveforms, frequency hopping, and continuous waveforms (FMCW) to reduce the signal profile. The low signal profile of the LPI signal enables the radar to perform detection and or target tracking while the target remains unaware. Several modulation techniques such as polytime codes, polyphase codes, FSK, and FMCW are used to produce LPI signals for transmission. This paper looks at the ability of spectral correlation along with a support vector machine in order to automatically classify the different LPI signal types in a non-cooperative environment. 相似文献
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一种新的伪码-线性调频复合信号侦察性能分析 总被引:1,自引:0,他引:1
针对雷达在现代电子战中所采用的线性调频(LFM)信号形式简单,易被敌方侦察接收机截获,而伪码调相信号对多普勒频移较敏感等问题,提出一种脉间伪码调相脉内线性调频的新的复合调制信号。分析了该信号的复合形式、频域特性,推导了复合信号的模糊函数表达式,最后分析了其距离、速度分辨率、模糊函数特性以及低截获性能。仿真结果表明,该新信号具有图钉型模糊函数和良好的距离及速度分辨率。在高分辨力,抗干扰、低截获方面都显示出独特的优势。 相似文献