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Lorentzian Model of Spatially Coherent Noise Field in Narrowband Direction Finding

机译:窄带测向中空间相干噪声场的洛伦兹模型

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摘要

When studying the radiation coming from far field sources using an array of sensors, besides the internal thermal noise, the received wave field is always perturbed by an external noise field, which can be temporally and spatially coherent to some degree, temporally incoherent and spatially coherent, spatially incoherent and temporally correlated or finally, the incoherence in both domains. Thus treating the received data needs to consider the nature of perturbing field in order to make accurate measurements such as powers of punctual sources, theirs locations and the types of waveforms which can be deterministic or random. In this paper, we study the type of temporally white and spatially coherent noise field; we propose a new spatial coherence function using Lorentz function. After briefly describing some existing models, we numerically study the effect of spatial coherence length on resolving the angular locations of closely radiating sources using spectral techniques which are divided into beam forming and subspace based methods, this study is made comparatively to temporally and spatially white noise with the same power as the proposed one in order to make a precise comparisons.
机译:当使用传感器阵列研究来自远场源的辐射时,除了内部热噪声外,接收到的波场总是受到外部噪声场的干扰,外部噪声场在时间和空间上可以保持一定程度的相干性,在时间上不相干且在空间上相干,空间不连贯和时间相关,或者最后是两个域中的不连贯。因此,处理接收到的数据需要考虑扰动场的性质,以便进行准确的测量,例如点源的功率,它们的位置以及可以是确定性或随机性的波形类型。在本文中,我们研究了时域白色和空间相干噪声场的类型。我们提出了一种使用Lorentz函数的新空间相干函数。在简要描述了一些现有模型之后,我们使用频谱技术(分为波束形成法和基于子空间的方法),数值研究了空间相干长度对解决近辐射源角位置的影响,该研究相对于时空白噪声具有与建议的功能相同的功能,以便进行精确的比较。

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