共查询到19条相似文献,搜索用时 125 毫秒
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有源和无源相控阵雷达的选择相控阵雷达又称相位阵列雷达,是一种以改变雷达波相位来改变波束方向的雷达,因为是以电子方式控制波束而非传统的机械转动天线的方式,故又称电子扫描雷达。相控阵雷达在传统雷达天线面的面积上可安装成百上千个阵元,任何一个阵元都可收发雷达波,而相邻的数个阵元即 相似文献
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基于相控阵雷达与机械扫描雷达扫描方式的差异,分析了相控阵雷达波束的扫描特点,根据该特点提出了信号聚集度的概念,并以此为信号特征对相控阵雷达体制进行识别。仿真实验以机械扫描雷达、一维相控阵雷达及二维相控阵雷达信号序列为识别对象,并考虑ESM截获信号序列的不完整性,对具有不同丢失率的雷达信号序列进行识别,结果表明:在信号序列丢失率达30%时,该方法仍能有效地对相控阵雷达体制进行识别。 相似文献
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针对传统雷达回波模拟技术模拟目标态势单一、建设成本高、灵活性差等缺陷,结合相控阵雷达快速波束定向的扫描特点,提出了一种基于射频存储转发技术和移动阵列平台的相控阵雷达外场试验目标模拟方法。该方法采用射频空间辐射注入的方式为雷达提供较为逼真的三维空间模拟目标回波信号和构建较为复杂的模拟目标场景态势,能够支持包括雷达天线在内的整个雷达系统进行模拟试验或训练。最后通过实例仿真验证了该方法的有效性和可实现性。 相似文献
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基于相控阵雷达自适应多波束,研究了相控阵雷达抗干扰的新方法,该方法把自适应波束调零控制技术、副瓣对消技术和极化选择抗干扰技术综合应用于相控阵接收多波束形成中,使相控阵雷达具有良好的抗干扰性能。 相似文献
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针对常规相控阵雷达的馈线网络小型化问题以及由发射高增益定向波束引起雷达信号被截获概率较大的问题,提出了一种新的相控阵雷达系统。该系统的馈线网络中仅有一个带移相器的收发共用通道,在时序控制模块的控制下贯续接入各收发共用的阵元进行发射信号馈送或信号接收,同一时刻只有一个阵元与通道连接。基于此系统提出了类波束形成的概念与技术,通过各阵元依次发射时间分集的脉冲信号形成类发射波束;各阵元依次接收这些脉冲信号并进行相干脉冲积累以形成类接收波束;并通过控制移相器的相移量以及通道切换时间形成各阵元间发射或接收的相位差进而控制类波束的最大指向。仿真分析证明了该系统能以较小的硬件规模在不形成高增益定向波束的前提下具有与常规相控阵相当的性能。 相似文献
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《防务技术》2015,(1)
Active phased array antennas enhances the performance of modern radars by using multiple low power transmit/receive modules in place of a high power transmitter in conventional radars. Fully distributed phased array radars demand the distribution of various signals in radio frequency(RF) and digital domain for real time operation. This is normally achieved through complex and bulky coaxial distribution networks. In this work, we intend to tap the inherent advantages of fiber links with wavelength division multiplexed(WDM) technology and a feasibility study to adapt these links for radar applications is carried out. This is done by analysing various parameters like amplitude, delay, frequency and phase variation response of various radar waveforms over WDM links. This also includes performance evaluation of non-linear frequency modulation(NLFM) signals, known for better signal to noise ratio(SNR) to specific side lobe levels. NLFM waveforms are further analysed using pulse compression(PC) technique. Link evaluation is also carried out using a standard simulation environment and is then experimentally verified with other waveforms like RF continuous wave(CW), pulsed RF and digital signals. Synchronization signals are generated from this variable duty cycle digital signals during real time radar operation. During evaluation of digital signals, variable transient effects for different duty cycles are observed from an amplifier configuration. A suppression method is proposed to eliminate this transient effects. Further, the link delay response is investigated using different lengths of fiber spools. It can be inferred from the experimental results that WDM links are capable of handling various signals significant to radar applications. 相似文献