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Fast post-Doppler STAP with road map for traffic monitoring: overview and first results 具有交通监测路线图的快速多普勒后STAP:概述和初步结果
IF 0.4 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2019-09-19 DOI: 10.5194/ars-17-137-2019
A. B. C. da Silva, S. Baumgartner, A. Moreira
Abstract. Synthetic aperture radar (SAR) is an efficient solution for road traffic monitoring due to its high spatial resolution and independence from daylight and weather conditions. In this sense, a number of ground moving target indication (GMTI) algorithms have been developed, whereas their robustness is often achieved with high costs, increased hardware complexity and high computational burden. This paper presents a fast GMTI processor that blends the powerful post-Doppler space-time adaptive processing (PD STAP) with an a priori known road map and digital elevation model (DEM). The algorithm presents great potential for real-time processing, decreased hardware complexity and low costs compared to state-of-the-art systems. It is tested using real 4-channel X-band radar data acquired with the DLR's airborne F-SAR.
摘要合成孔径雷达(SAR)由于其高空间分辨率和独立于日光和天气条件,是道路交通监测的有效解决方案。从这个意义上说,已经开发了许多地面移动目标指示(GMTI)算法,而它们的鲁棒性通常是通过高成本、增加的硬件复杂性和高计算负担来实现的。本文提出了一种快速GMTI处理器,该处理器将强大的后多普勒时空自适应处理(PD-STAP)与先验已知的路线图和数字高程模型(DEM)相结合。与最先进的系统相比,该算法在实时处理、降低硬件复杂性和降低成本方面具有巨大潜力。利用德国航空航天中心机载F-SAR获得的真实4通道X波段雷达数据对其进行了测试。
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引用次数: 1
Multilayered Transmission Lines on Quasi-planar Substrates With Anisotropic Medium 各向异性介质准平面基片上的多层传输线
IF 0.4 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2019-09-19 DOI: 10.5194/ars-17-77-2019
Veenu Kamra, A. Dreher
Abstract. This paper exhibits the extension of the discrete mode matching (DMM) method to analyze conformal structures with anisotropy. It represents a simple formalism as a basis to analyze multilayered structures with quasi-planar anisotropic dielectric layers. The dyadic Green's function is then calculated using a full-wave equivalent circuit (FWEC) of the structure, where each layer is represented with the hybrid block consisting of the tangential field components. The application is demonstrated by computing propagation constants for partially filled quasi-planar waveguides and microstrip lines with isotropic, uniaxial and biaxial anisotropic dielectrics.
摘要本文将离散模式匹配(DMM)方法推广到分析各向异性共形结构。它为分析具有准平面各向异性介质层的多层结构提供了一个简单的形式化基础。然后使用结构的全波等效电路(FWEC)计算并矢格林函数,其中每层都用由切向场分量组成的混合块表示。通过计算具有各向同性、单轴和双轴各向异性介质的部分填充准平面波导和微带线的传播常数,证明了该方法的应用。
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引用次数: 3
High-resolution signal-in-space measurements of VHF omnidirectional ranges using UAS 利用无人机对甚高频全向范围的高分辨率空间信号进行测量
IF 0.4 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2019-09-19 DOI: 10.5194/ars-17-1-2019
T. Schrader, J. Bredemeyer, M. Mihalachi, D. Ulm, T. Kleine-Ostmann, Christoph Stupperich, Sergei Sandmann, H. Garbe
Abstract. In this paper, we describe measurement results of thesignal-in-space of very high frequency (VHF) omnidirectional range (VOR)facilities. In aviation VOR are used to display the current course of theaircraft in the cockpit. To understand the influence of wind turbines (WT)on the signal integrity of terrestrial navigation and radar signals, thesignal content and its changes, respectively, must be investigated. So far,only numerical simulations have been carried out on the frequency-modulation(FM) part of the Doppler-VOR (DVOR) signal to estimate the influence of WTon DVOR. Up to now, the amplitude-modulated (AM) part of the DVOR was notassessed at all. In 2016, we presented an unmanned aerial system (UAS) as acarrier for state-of-the-art radio-frequency (RF) measurementinstrumentation (Schrader et al., 2016a, c; Bredemeyer et al., 2016), to measure and to record the true signal-in-space(both FM and AM signal) during the flight. The signal-in-space (which refersto time-resolved signal content and field strength, respectively) ismeasured and sampled without loss of information and, furthermore,synchronously stored with time stamp and with precise position in space,where the measurements were taken.
摘要本文描述了甚高频(VHF)全向距离(VOR)设施的空间信号测量结果。在航空中,VOR是用来在驾驶舱中显示飞机当前的航向。为了了解风力发电机组对地面导航信号和雷达信号完整性的影响,必须分别研究信号内容及其变化。到目前为止,仅对多普勒- vor (DVOR)信号的调频部分进行了数值模拟,以估计WTon DVOR的影响。到目前为止,对DVOR的调幅部分还没有进行评估。2016年,我们提出了一种无人机系统(UAS)作为最先进的射频(RF)测量仪器的载体(Schrader等人,2016a, c;Bredemeyer et al., 2016),测量和记录飞行过程中的真实空间信号(调频和调幅信号)。空间信号(分别指时间分辨信号内容和场强)在不丢失信息的情况下进行测量和采样,并且与时间戳和测量地点在空间中的精确位置同步存储。
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引用次数: 6
Results from the national intercomparison for rise time and bandwidth measurements within the German Calibration Service (Deutscher Kalibrierdienst – DKD) 德国校准服务(Deutscher Kalibrierdienst - DKD)内上升时间和带宽测量的全国比对结果
IF 0.4 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2019-09-19 DOI: 10.5194/ars-17-45-2019
K. Baaske, T. Kleine-Ostmann, T. Schrader
Abstract. An intercomparison in the framework of the German Calibration Service (DeutscherKalibrierdienst – DKD) was carried out. Two different travelling standardswere used to measure the 10 % to 90 % rise time of a pulse generator andthe 10 % to 90 % rise time, −3 dB bandwidth and attenuation at 500 MHzof an oscilloscope. Fourteen participants performed the measurements fromSeptember 2015 until May 2016.
摘要在德国校准服务机构(Deutscher Kalibrierdienst–DKD)的框架内进行了相互比较。使用两种不同的旅行标准来测量10 % 至90 % 脉冲发生器的上升时间和10 % 至90 % 上升时间,−3 500时的dB带宽和衰减 MHzof示波器。从2015年9月到2016年5月,14名参与者进行了测量。
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引用次数: 0
Tidal wind shear observed by meteor radar and comparison with sporadic E occurrence rates based on GPS radio occultation observations 流星雷达观测到的潮汐风切变及其与基于GPS无线电掩星观测的零星E发生率的比较
IF 0.4 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2019-09-19 DOI: 10.5194/ars-17-213-2019
C. Jacobi, C. Arras
Abstract. We analyze tidal (diurnal, semidiurnal, terdiurnal, quarterdiurnal) phasesand related wind shear in the mesosphere/lower thermosphere as observed bymeteor radar over Collm (51.3∘ N, 13.0∘ E). The wind shear phases arecompared with those of sporadic E (Es) occurrence rates, which werederived from GPS radio occultation signal-to-noise ratio (SNR) profilesmeasured by the COSMIC/FORMOSAT-3 satellites. At middle latitudes Es aremainly produced by wind shear, which, in the presence of a horizontalcomponent of the Earth's magnetic field, leads to ion convergence in the regionwhere the wind shear is negative. Consequently, we find good correspondencebetween radar derived wind shear and Es phases for the semidiurnal,terdiurnal, and quarterdiurnal tidal components. The diurnal tidal windshear, however, does not correspond to the Es diurnal signal.
摘要我们分析了科尔姆(51.3°N, 13.0°E)上空流星雷达观测到的潮汐能(日、半日、日、四分之一日)阶段和相关的中间层/低层热层风切变。通过COSMIC/FORMOSAT-3卫星测量的GPS无线电掩星信噪比(SNR)剖面,将风切变相位与零星E (Es)发生率进行了比较。在中纬度地区,Es主要由风切变产生,在地球磁场水平分量存在的情况下,导致风切变为负的区域离子辐合。因此,我们发现雷达导出的风切变和Es相在半日、日晷和四分之一日潮汐分量之间具有良好的对应关系。然而,日潮风切变与Es日信号并不对应。
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引用次数: 12
Disturbing impact of multiple wind turbines on the indicated DVOR bearing 多台风力涡轮机对指示DVOR轴承的干扰影响
IF 0.4 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2019-09-19 DOI: 10.5194/ars-17-11-2019
Sergei Sandmann, H. Garbe
Abstract. Radio navigation aids, like the Doppler Very High Frequency Omnidirectional Radio Range (DVOR), provide their navigation service by specific radiation of electromagnetic waves depending on the direction in space and according to their specific antenna characteristics. Therefore, these navigation aids are reliant on undisturbed wave propagation in their operation range. Certainly, a propagation disturbance can be implicated by the presence of scattering objects like large buildings or wind turbines (WT) in the surrounding area of the DVOR, which potentially leads to deviations of the transmitted navigation content. In order to comply with the specified flight safety limits, especially respecting WTs, there is a necessity to predict the prospective bearing error due to installations not only of individual WTs but also of additional ones in a present wind farm or repowering projects. Accordingly, this paper is aimed at ascertaining the bearing deviations' dependency on the quantity of WTs in a realistic wind farm close to a DVOR, calculated in space areas of practical relevance.
摘要无线电导航设备,如多普勒甚高频全向无线电测距仪(DVOR),根据其特定的天线特性和空间方向,通过特定的电磁波辐射提供导航服务。因此,这些助航设备依赖于其工作范围内不受干扰的波传播。当然,在DVOR的周围区域存在诸如大型建筑物或风力涡轮机(WT)之类的散射物体可能会导致传播干扰,这可能会导致传输导航内容的偏差。为了符合规定的飞行安全限制,特别是在wt方面,有必要预测由于安装单个wt以及在现有风电场或重新供电项目中安装额外wt而导致的预期方位误差。因此,本文旨在确定在实际相关的空间区域中计算的接近DVOR的实际风电场中WTs数量对方位偏差的依赖关系。
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引用次数: 1
Estimation of ionospheric reflection height using long wave propagation 利用长波传播估计电离层反射高度
IF 0.4 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2019-09-19 DOI: 10.5194/ars-17-205-2019
D. Keuer
Abstract. Phase height measurements of low frequency radio wavesare used to study the long-term variability of the mesosphere over Europe.Phase height measurements use a characteristic pattern in field strengthregistration of radio waves interpreted as phase relations between sky waveand surface wave to obtain the apparent height of the reflection point, theStandard Phase Height (SPH). Based on this SPH-method a homogenized dailyseries was generated since 1959 at Kühlungsborn. Improvements of themeasuring method show that the signal is significantly influenced by loweratmospheric layers. Mesospheric reflection is not the exclusive source ofthe measured behavior. Tropospheric influence can not be neglected. Takingthis into account one has to conclude that the strong coherency of the SPHdata to mesospheric heights is not as significant as previously assumed.
摘要低频无线电波的相位高度测量用于研究欧洲中间层的长期变化。相位高度测量使用无线电波场强配准中的特征模式,即天波和表面波之间的相位关系,以获得反射点的视高度,即标准相位高度(SPH)。基于这种SPH方法,自1959年以来,在Kühlungsborn生产了一个均质的奶牛场。对测量方法的改进表明,信号受到低层大气的显著影响。中层反射并不是测量行为的唯一来源。对流层的影响不容忽视。考虑到这一点,我们不得不得出结论,SPHdata与中间层高度的强相干性并不像之前假设的那样重要。
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引用次数: 1
Singularity Expansion Method for thin wires and the Method of Modal Parameters 细导线奇异展开法及模态参数法
IF 0.4 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2019-09-19 DOI: 10.5194/ars-17-177-2019
S. Tkachenko, J. Nitsch, Felix Middelstaedt, R. Rambousky, M. Schaarschmidt, R. Vick
Abstract. Here, we describe a technique to define the SingularityExpansion Method (SEM) poles for short-circuited thin-wire structuresdeveloped using the Method of Modal Parameters (MoMP). The MoMP methodconsists of in the expansion of the system of mixed-potential integralequations (MPIE) into the Fourier series, including the kernels containingGreen's function. Corresponding equations for Fourier modes contain infinitematrices of p.u.l. inductance and capacitance, and the solution for currentcan be obtained using the infinity matrix of p.u.l. impedance. The SEM polesare given by the zeros of the determinant of this matrix. For the case ofthe symmetrical circular loop, this equation transforms to one well-knowfrom the literature. Numerical investigation of solutions for the poles ofthe first layer has shown good agreement with previously obtained analyticaland numerical results for different wire configurations.
摘要在这里,我们描述了一种使用模态参数法(MoMP)开发的用于短路细线结构的奇异展开法(SEM)极点的定义技术。MoMP方法包括将混合势积分方程组(MPIE)展开为傅立叶级数,包括包含格林函数的核。傅立叶模式的相应方程包含p.u.l.电感和电容的无穷大矩阵,并且可以使用p.u.l.阻抗的无穷大阵来获得电流的解。SEM极点由该矩阵的行列式的零给出。对于对称圆环的情况,这个方程转化为文献中众所周知的方程。对第一层极点解的数值研究表明,对于不同的导线配置,与先前获得的分析和数值结果具有良好的一致性。
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引用次数: 1
Application of Kramers-Kronig transformations to increase the bandwidth of small antennas Kramers-Kronig变换在提高小型天线带宽中的应用
IF 0.4 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2019-09-19 DOI: 10.5194/ars-17-65-2019
M. Bakry, L. Klinkenbusch
Abstract. The internally stored electric energy (Q-energy) of a disk monopole antenna increases as compared to a monopole antenna without a top disk. Recently it was shown that the Q-energy can be significantly reduced and the bandwidth increased by shielding the disk monopole antenna using a thin magnetic material. In the present paper we consider the same structure to explain another method to increase the bandwidth by using a shield made of dispersive magnetic material. We apply the Kramers-Kronig transforms to derive physically correct real and imaginary parts of the dispersive magnetic material. We do not aim at a reduction of the internal energy but at a compensation of the electric by a magnetic stored energy for a wide frequency range. Disk monopole antennas with shells consisting of such dispersive permeability are finally numerically evaluated by means of a commercial frequency-domain field simulator.
摘要与没有顶部圆盘的单极天线相比,圆盘单极天线的内部存储的电能(Q能量)增加。最近的研究表明,通过使用薄磁性材料屏蔽圆盘单极天线,可以显著降低Q能量并增加带宽。在本文中,我们考虑相同的结构来解释另一种通过使用色散磁性材料制成的屏蔽来增加带宽的方法。我们应用Kramers-Kronig变换来导出色散磁性材料的物理正确的实部和虚部。我们的目标不是减少内部能量,而是通过在宽频率范围内存储的磁性能量来补偿电能。最后,利用商用频域场模拟器对具有由这种色散磁导率组成的外壳的圆盘单极天线进行了数值评估。
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引用次数: 2
Extending the vehicular network simulator Artery in order to generate synthetic data for collective perception 扩展车辆网络模拟器动脉,以便为集体感知生成合成数据
IF 0.4 Q4 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2019-09-19 DOI: 10.5194/ars-17-189-2019
Christoph Allig, G. Wanielik
Abstract. A fundamental for an automated driving car is the awareness of all its surrounding road participants. Current approach to gather this awareness is to sense the environment by on-board sensors. In the future, Vehicle-to-X (V2X) might be able to improve the awareness due to V2X's communication range superiority compared to the on-board sensors' range. Due to a limited amount of communication partners sharing their own ego states, current research focuses particularly on cooperative perception. This means sharing objects perceived by local on-board sensors of different partners via V2X. Data collections using vehicles, driving on real roads, is challenging, since there is no market introduction of cooperative perception yet. Using test cars, equipped with the required sensors are rather expensive and do not necessarily provide results representing the true potential of cooperative perception. Particularly, its potential is highly dependent on the market penetration rate and the amount of vehicles within certain vicinity. Therefore, we consider to create synthetic data for cooperative perception by a simulation tool. After reviewing suitable simulation tools, we present an extension of Artery and its counterpart SUMO by modelling realistic vehicle dynamics and probabilistic sensor models. The generated data can be used as input for cooperative perception.
摘要自动驾驶汽车的基础是对周围所有道路参与者的意识。目前收集这种意识的方法是通过车载传感器感知环境。未来,由于V2X的通信范围优于车载传感器的范围,车对x (V2X)可能能够提高感知能力。由于交流伙伴分享自我状态的数量有限,目前的研究主要集中在合作感知上。这意味着通过V2X共享不同合作伙伴的本地车载传感器感知到的物体。使用在真实道路上行驶的车辆收集数据是具有挑战性的,因为目前还没有市场引入合作感知。使用配备所需传感器的测试车是相当昂贵的,而且不一定能提供代表合作感知真正潜力的结果。特别是,它的潜力高度依赖于市场渗透率和一定范围内的车辆数量。因此,我们考虑通过仿真工具创建协作感知的综合数据。在回顾了合适的仿真工具之后,我们通过模拟真实的车辆动力学和概率传感器模型,提出了对Artery及其对应的SUMO的扩展。生成的数据可以作为协同感知的输入。
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引用次数: 5
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Advances in Radio Science
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