共查询到19条相似文献,搜索用时 125 毫秒
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为了实时监测地海杂波信号,提高雷达的监测性能,设计了地海杂波测试平台.根据地海杂波的频带特性,采用L波段椭圆波束偏执抛物面天线作为接收天线;通过系统分析,确定地海杂波信号范围,进而采用伺服控制系统,控制天线的方位,实时准确的监测地海杂波信号.通过系统的分析和测试表明,本文设计的地海杂渡测试控制平台,对L波段的地海杂渡信号起到了实时有效的监测作用,对降低地海杂波信号干扰,提高雷迭的监测性能具有很重要的现实意义. 相似文献
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给出了机载雷达杂波模拟器的设计和实现方案,该模拟器采用专用软件及专用硬件相结合,实时与非实时相结合的方法,产生的杂波能够满足所要求的功率谱特性,其实测结果和仿真结果能够符合。为机载雷达杂波的模拟和工程实现提供了可行的方法。 相似文献
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针对雷达杂波仿真的实现问题,论文从相关杂波仿真、杂波功率谱计算原理、雷达杂波的幅度分布、仿真结果的实现四个步骤进行论述,最后以实例进行计算仿真,最终结果表明可以准确的实时的反映雷达杂波的特性。 相似文献
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雷达地海杂波统计特性研究 总被引:2,自引:0,他引:2
雷达地海杂波研究越来越受到雷达及遥感界的重视,本文综述了测量方面的典型事件及幅度分布、谱特性方面的典型模型,最后给出了作者对雷达地海杂波研究的展望。 相似文献
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雷达杂波模拟广泛应用于雷达成像和电子对抗等相关领域。本文采用TMS320C6414DSP处理器根据实时侦察获取的雷达参数进行实时杂波信号的仿真生成,仿真结果与理论数据相比具有较大的相关性。 相似文献
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O'Neill K. Keli Sun Shubitidze F. Shamatava I. Paulsen K.D. 《Geoscience and Remote Sensing, IEEE Transactions on》2006,44(1):32-46
In practice, most signal processing strategies for discrimination of buried objects are clutter limited. This applies even to discrimination of shallow sizable metallic objects, such as unexploded ordnance (UXO), which are to be found predominantly in the top meter of soil. The environment typically features widespread metallic clutter from detonated ordnance or other sources. Such fragments can be numerous and are often shallower than the objects of interest. Currently, the preeminent remote sensing mode for buried UXO is ultrawideband electromagnetic induction (EMI), operating over part or all of the band from some tens of hertz up to perhaps hundreds of kilohertz. Particularly because EMI fields fall off sharply with range, signals from shallow clutter may be relatively strong and can easily obscure essential scatterer signatures. To treat this, a rational theory of EMI scattering from widespread metallic clutter is formulated and tested. For dense, well-distributed clutter, analytical rules are derived for dependence of signal strength on sensor elevation, under various fundamental excitation types. For more erratic, sparse clutter distributions, signal statistics from Monte Carlo simulations show patterns like those from the analytical rules. The dependence of clutter signal magnitude on antenna elevation is determined for both thin surface layers and for volume layers of widespread small items, and for both dense and sparse clutter distributions. These are contrasted with the patterns expected from single, larger, discrete objects of interest, and the contrast is exploited in discrimination exercises for the screening problem. For sparse clutter distributions, results from inversion processing formulations that account for the patterns of clutter statistics are compared to simple least squares treatments. 相似文献
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天发舰收高频雷达是对传统固定平台条件下天地波雷达系统的延伸,由于舰载平台运动和传播信道中电离层的影响,使得一阶海杂波谱呈现出更多特点.本文根据Walsh模型中一阶电场方程,推导得到了天发舰收传播模式下一阶海面散射截面积的解析表达式.然后,根据表达式对不同因素对一阶谱的影响进行仿真分析.仿真结果表明雷达工作频率、舰载平台运动和电离层水平漂移运动是引起一阶海杂波谱多普勒展宽的主要原因,风向主要影响一阶海杂波谱的形态变化,而这一特点为根据一阶海杂波谱进行海洋遥感提供了可能. 相似文献
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空间微波遥感信息技术的发展与国家安全、军事环境监测、导弹制导、背景中目标识别与跟踪、军事预警、电子对抗等军事高科技有着十分密切的关系。本文讨论我们的微波遥感信息研究在现今军事科技中几个方面的应用。其中包括导弹制导时地表散射杂波的模拟与多谱勒频移的仿真,合成孔径雷达(SAR)图像中船行尾迹对海面舰船的识别,浅海水下地形的反演,低掠角入射海面与舰船的双站散射模拟,从SAR,SSM/I(SpecialSensorMicrowave/Imager)星载微波主被动遥感图像数据反演特定区域的气象等环境特征。 相似文献
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In this paper, we consider the problem of obtaining a reduced-dimension parameterization of a propagation medium for the purpose of estimating the medium from transmission data. The application addressed is microwave remote sensing of tropospheric index-of-refraction profiles over the sea surface, using radar clutter returns. The proposed parameterization balances the desire to represent features prominent in the a priori statistics of the profiles versus the need to capture elements of the profile that significantly affect the observed clutter data. In linear estimation problems, basis vectors for the unknown parameter vector that optimizes this tradeoff have been derived as the reduced-rank Wiener filter or, equivalently, the generalized Karhunen-Loeve transform (GKLT). In this paper, we reinterpret the linear result, producing an extension to the nonlinear refractivity estimation problem. The resulting procedure produces basis vectors for tropospheric refractivity that are less dependent on features that have little effect on the clutter measurements. This results in a more efficient parameterization and reduces mean-square estimation error relative to an approach driven purely by the statistical prior. Application of the generalized KL technique to finding efficient basis vectors for refractivity profiles taken off the southern California coast is presented. 相似文献
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The ASR-9 marks a significant departure from earlier ASR designs [1]. Major operational benefits are realized by applying modern digital technology and advanced processing concepts. It is evolutionary in that it retains the desirable features of its predecessors. This paper will focus on the principal characteristics that make its design unique. The following topics are covered: aircraft detection in clutter, range resolution, azimuth resolution, weather contouring, remote performance monitoring and control. 相似文献
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以多载频矩形脉冲信号为发射信号,建立了机载分布式相干MIMO雷达的杂渡模型;给出了经典的杂波功率谱估计方法和杂波自由度估计规则;仿真分析了多载频频率步进和不同误差条件下的最小方差(MV,minimum variance)杂波谱和杂波特征谱.仿真及分析结果表明:机载分布式相干MIMO雷达的杂波具有空时二维斜对角分布特性;杂波起伏、载机偏航均会使杂波谱展宽及杂波自由度增大;多载频频率步进的增长导致杂波去相关. 相似文献