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评估雷达抗干扰能力实用模型 总被引:2,自引:0,他引:2
文章根据雷达、电子对抗及野战防空系统战技术论证,效能分析和军标制定的需要,详细分析了评估雷达抗干扰能力的定性法、自卫距离法、烧穿距离法、改善因子法、有效改善因子法、压制系数法、概率计算法的优缺点。 相似文献
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随着现代武器和飞行技术的发展,对雷达的作用距离、分辨力和测量精度等性能的要求越来越高。使用宽带信号和脉冲压缩技术的现代跟踪测量雷达采用宽脉冲发射,以提高发射的平均功率,保证足够的最大作用距离;而接收时则采用相应的脉冲压缩方法获得窄脉冲,以提高距离分辨力,从而较好地解决作用距离和分辨力之间的矛盾。由于系统中采用了中频采样、数字脉压等技术,当前周期的回波信息需要延迟若干个重复周期才能送至测距系统,因此距离跟踪回路的参数要做相应调整。 相似文献
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本文是一篇评论几种类型的能提供目标高度和距离、方位的三座标战术对空监视雷达的文章。这些雷达包括采用叠接波束、频扫或相扫以获得仰角覆盖且采用机扫以获得360°方位覆盖的各种雷达。机载雷达和机载武器系统处于近距离时需要三座标雷达。这些近程系统和性能局限的飞机导致对目标高度精度的严格要求。显然,为了引导战斗机去截击敌机,必须同时提供高度信息和距离、方位信息。 相似文献
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随机二相编码连续波雷达的研究 总被引:7,自引:0,他引:7
本文对新型噪声雷达即随机二相编码连续波雷达作了系统研究。分析了该雷达波形的概率分布、平均模糊函数以及脉冲压缩后距离旁瓣的概率分布,提出了一种抑制距离旁瓣的统计处理方法,通过多级统计处理后可保证峰值距离旁瓣低于-30dB,同时给出了系统参数的设计,并讨论了该噪声雷达的多普勒容限扩展问题,分析表明,该噪声雷达能同时测定远距离和高速目标。 相似文献
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在给定雷达的检测概率和虚警概率后,系统输出信噪比直接影响雷达的作用距离。采用距离分段加权技术,可以减小加权引起的信噪比损失,从而提高了雷达的作用距离。给出了泰勒窗函数在距离分段加权中的应用,事实已证明该方法的可行性。 相似文献
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现代雷达需要有较好的低截获特性,同时在大量低雷达有效截面(RCS)目标出现后,为了增强雷达对这些目标的探测能力,通过降低信号处理的检测门限,然后采用数据处理的方法,沿目标的运动路径将回波幅度进行非相参积累,提高目标探测能力。机载雷达由于载机载重量、体积以及功耗的限制原因,采用复杂的数据处理技术提高探测距离尤为重要,进而也需要系统具备更高的数据运算能力。本文采用检测前跟踪技术(TBD)提高目标探测距离,并采用适当的并行处理体系来实现系统的高性能运算,对某机载雷达的实际飞行试验数据进行处理,结果表明该方法明显提高了系统探测性能。 相似文献
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在雷达自动距离跟踪系统中,时间鉴别器是关键技术之一。在跟踪目标时首先要需要用它来自动检测出被跟踪目标信号相对跟踪门之间的延迟时间差,并将时间差转换成相应的距离误差。 相似文献
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文章用MC-52做CPU,MC6845做CRTGC,配以光栅扫描技术实现了某战场监视雷达的显示系统。它能自动显示十批目标的批次、方位、距离和速度,目标余的长短和显示屏幕上的方位、距离分辨率可用软件任意设置。采用最优化的硬件设计和模块式软件组合,使得该系统体积小、重量轻、性能价格比高,能适应现代战争的需要。 相似文献
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对雷达干扰信号的分析与设计是雷达对抗领域的热点问题之一。本文针对脉冲压缩体制雷达的特点,提出一种多相位分段调制干扰方法,通过部分破坏和保留原雷达信号的相干性实现局部遮盖干扰。对多相位分段调制的工作原理进行详细说明,给出干扰信号的数学推导。以应用线性调频信号的脉冲压缩雷达为例,结合自卫式干扰模型,推导了干扰信号的幅相特性和脉冲压缩结果,分析了调制参数对干扰遮盖范围的影响。最后,对相关结论进行仿真验证,说明应用该干扰方法能够产生灵活可控的局部遮盖干扰,具备实用性。 相似文献
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Nonsinusoidal radar signal design for stealth targets 总被引:1,自引:0,他引:1
The detection of stealth point targets challenges the design of conventional radars using sinusoidal carriers since the objective of stealth technology is to reduce the radar cross section (RCS) of targets to a level where the radar receiver cannot detect the target. While there are a number of techniques employing different technologies to reduce the RCS of targets, shaping and coating the target with absorbing material are the most useful ones. The analysis and design of nonsinusoidal radar signals is based on modeling stealth point targets by a two-layer structure consisting of a metal surface covered with a coat of absorbing material. The design is presented for two classes of signals: uncoded signals and pulse compression signals using Barker codes. The relationship between target response, absorbing material time delay, time variation of transmitted pulses and coding features are determined and analyzed. While sliding correlators are used for detection and selection of various target responses, their output autocorrelation functions are determined analytically in terms of transmitted signal autocorrelation functions. Thumbtack range-velocity resolution functions are obtained for transmitted signal characters with a single pulse and characters with coded waveforms, for different pulse duration. It is shown that the range resolution can be improved by the proper choice of the transmitted signal duration relative to absorbing material time delay. Thumbtack range-velocity resolution functions similar to those of conventional point targets can also be realized 相似文献
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动目标检测与速度估计仿真研究 总被引:1,自引:1,他引:0
介绍了雷达信号处理技术中的脉冲压缩、动目标检测、脉冲多普勒处理和恒虚警检测技术,并对雷达发射波形、目标回波、动目标检测进行了Matlab仿真。对脉冲回波信号进行脉冲压缩与动目标显示得到动目标脉压信号。利用动目标显示和脉冲多普勒处理实现脉压信号的动目标检测,并得到脉冲多普勒数据块。在数据块的距离维上进行恒虚警检测,检测动目标的距离,然后提取对应距离门的多普勒数据,检测动目标的速度。通过仿真建立了雷达信号处理的基本框架,为雷达系统建模及其仿真的深入研究提供了仿真支持。 相似文献
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Radar signal design for target resolution 总被引:1,自引:0,他引:1
Target resolution involves the recognition of a particular target in an arbitrary target environment. While pulse compression methods have solved the problem of separating two closely spaced targets of about the same cross section, this separation is usually accomplished at the expense of introducing "sidelobes" in the matched filter response, which may mask weak targets and prevent their detection altogether. The paper investigates the nature of the constraints on combined range and range rate resolution in a matched filter radar and establishes a clear tie between the uncertainty relation and the practical limitations on the resolution performance of radar. It is found that, in general, an optimum radar waveform for target resolution cannot exist. Radar signal design for target resolution consists of matching the waveform to the characteristics of the target environment, and a signal can be optimum only in that it achieves the best match. These findings are illustrated by examples of matching the radar waveform to a given target environment. 相似文献
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Jian Li Luzhou Xu Stoica P. Forsythe K.W. Bliss D.W. 《Signal Processing, IEEE Transactions on》2008,56(1):218-232
A multi-input multi-output (MIMO) radar system, unlike standard phased-array radar, can transmit via its antennas multiple probing signals that may be correlated or uncorrelated with each other. This waveform diversity offered by MIMO radar enables superior capabilities compared with a standard phased-array radar. One of the common practices in radar has been range compression. We first address the question of ldquoto compress or not to compressrdquo by considering both the Cramer-Rao bound (CRB) and the sufficient statistic for parameter estimation. Next, we consider MIMO radar waveform optimization for parameter estimation for the general case of multiple targets in the presence of spatially colored interference and noise. We optimize the probing signal vector of a MIMO radar system by considering several design criteria, including minimizing the trace, determinant, and the largest eigenvalue of the CRB matrix. We also consider waveform optimization by minimizing the CRB of one of the target angles only or one of the target amplitudes only. Numerical examples are provided to demonstrate the effectiveness of the approaches we consider herein. 相似文献
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现代雷达广泛使用脉冲压缩、MTD处理等相干处理方法,具有较大的信号处理得益,抗干扰能力明显提高。DRFM可对雷达信号进行长时间的相干存储,是干扰现代相干体制雷达的重要手段。传统的DRFM干扰采用信号存储然后多次转发的干扰方法,获得的假目标数量少且干扰机能量利用率低。文中在前人算法基础上,提出一种密集假目标干扰实现方法。该方法可以灵活控制假目标之间的间隔和产生的假目标个数,并且通过设置不同的假目标距离间隔既可实现密集假目标欺骗干扰效果,也可实现压制干扰效果。理论分析和干扰仿真证明,该方法具有良好的实用价值。 相似文献