• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >New methods for the detection and interception of unknown, frequency-hopped waveforms.
【24h】

New methods for the detection and interception of unknown, frequency-hopped waveforms.

机译：检测和拦截未知的跳频波形的新方法。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Three new methods for the detection and interception of frequency-hopped waveforms are presented. The first method extends the optimal, fixed-block detection method based on the likelihood ratio to a sequential one based on the Sequential Probability Ratio Test (SPRT). The second method is structured around a compressive receiver and is highly efficient yet easily implemented. The third method is based on the new concept of Amplitude Distribution Function (ADF) and results in a detector that is an extension of the radiometer.; The first method presents a detector structured to make a decision sequentially, that is, as each data element is collected. Initially, a purely sequential test is derived and shown to require fewer data for a decision. A truncated sequential method is also derived and shown to reduce the data needed for a decision while operating under poor signal-to-noise ratios (SNRs). A detailed performance analysis is presented along with numerical and Monte Carlo analyses of the detectors.; The second method assumes stationary, colored Gaussian interference and presents a detailed model of the compressive receiver. A locally optimal detector is developed via the likelihood ratio theory and yields a reference to which previous ad hoc schemes are compared. A simplified, suboptimal scheme is developed that trades off duty cycle for performance, and a technique for estimating hop frequency is developed. The performance of the optimal and suboptimal detectors is quantified. For the suboptimal scheme, the trade-off with duty cycle is studied. The reliability of the hop frequency estimator is bounded and traded off against duty cycle.; In the third method, a precise definition of the ADF is given, from which follows a convolutional relationship between the ADFs of signal and additive noise. A technique is given for deconvolving the ADF, with which signal and noise components can be separated. A detection statistic based directly on this deconvolution technique is defined and statistically characterized, yielding a framework on which to synthesize a detector. The detector's performance is analyzed and compared with the radiometer.
机译：提出了三种检测和截获跳频波形的新方法。第一种方法将基于似然比的最佳固定块检测方法扩展到基于顺序概率比测试（SPRT）的顺序方法。第二种方法是围绕压缩接收器构建的，效率很高，但易于实现。第三种方法基于幅度分布函​​数（ADF）的新概念，并导致检测器成为辐射计的扩展。第一种方法提出了一种检测器，该检测器构造为顺序地（即，在收集每个数据元素时）做出决定。最初，得出了纯粹的顺序测试，并表明需要较少的数据来做出决定。还推导了一种截断的顺序方法，显示了该方法可以减少在较差的信噪比（SNR）下工作时决策所需的数据。给出了详细的性能分析以及检测器的数值分析和蒙特卡洛分析。第二种方法假定静止的有色高斯干涉，并给出压缩接收机的详细模型。通过似然比理论开发了一种局部最优检测器，并提供了一个参考值，可以与先前的临时方案进行比较。开发了一种简化的次优方案，该方案牺牲了占空比以提高性能，并开发了一种估算跳频的技术。最佳和次优检测器的性能被量化。对于次优方案，研究了占空比的权衡。跳频估计器的可靠性是有界的，需要与占空比进行权衡。在第三种方法中，给出了ADF的精确定义，从中可以得出信号ADF与加性噪声之间的卷积关系。给出了一种对ADF进行卷积的技术，利用该技术可以分离信号和噪声分量。直接基于这种反卷积技术的检测统计数据已定义并进行了统计表征，从而产生了可在其上合成检测器的框架。分析探测器的性能，并与辐射计进行比较。

著录项

  • 作者

    Snelling, William Edward.;

  • 作者单位

    University of Maryland College Park.;

  • 授予单位 University of Maryland College Park.;
  • 学科 Engineering Electronics and Electrical.; Statistics.; Mathematics.
  • 学位 Ph.D.
  • 年度 1990
  • 页码 196 p.
  • 总页数 196
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;统计学;数学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号