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Monitoring ionospheric space weather with the Super Dual Auroral Radar Network (SuperDARN) 利用超级双极光雷达网监测电离层空间天气
Pub Date : 2010-05-10 DOI: 10.1109/RADAR.2010.5494396
J. Baker, J. Ruohoniemi, A. J. Ribeiro, L. Clausen, R. Greenwald, N. Frissell, K. A. Sterne
The Super Dual Auroral Radar Network (SuperDARN) of high frequency radars monitors ionospheric space weather at middle to high latitudes in both hemispheres. SuperDARN is an international collaboration involving scientists and engineers from over a dozen countries. The backscatter targets of interest are irregularities in the ionospheric plasma density that are aligned along the geomagnetic field. The Doppler motion of the irregularities can be used to infer the strength and direction of the ionospheric electric field. These measurements, obtained continuously, provide valuable information about the electrodynamics of the coupled magnetosphere-ionosphere system over extended spatial scales and with high time resolution. In this paper, the history of SuperDARN is briefly reviewed with a particular emphasis on the recent expansion of the network to middle and higher latitudes. A technique for assimilating multi-radar data to produce space weather maps of the hemispheric state of ionospheric plasma motion is also described.
由高频雷达组成的超级双极光雷达网(superdamn)监测两个半球中高纬度的电离层空间天气。superdam是一项国际合作,涉及来自十多个国家的科学家和工程师。我们感兴趣的反向散射目标是沿地磁场排列的电离层等离子体密度的不规则性。不规则的多普勒运动可以用来推断电离层电场的强度和方向。这些连续获得的测量结果提供了有关磁层-电离层耦合系统在扩展空间尺度和高时间分辨率上的电动力学的宝贵信息。本文简要回顾了superdam的历史,特别强调了近年来该网络向中高纬度地区的扩展。本文还介绍了一种吸收多雷达数据来生成电离层等离子体半球运动状态空间天气图的技术。
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引用次数: 3
A target alignment algorithm for through-the-wall radar imagery classification 一种用于穿墙雷达图像分类的目标对准算法
Pub Date : 2010-05-10 DOI: 10.1109/RADAR.2010.5494519
B. Mobasseri, G. Smith, Imad Estephan
Sensing through the wall using radar is a valuable capability. There is considerable work in generating radar images of the interior of a room by beamforming of the radar backscatter generated in a Synthetic Aperture Radar (SAR) configuration. However, high level interpretation of the scene is a more difficult task. In previous work a minimum distance classifier was successfully used to recognize various targets placed in the scene. The approach suffered from the dependency of target features on target location. This work presents a solution to this problem by bringing the target intensity profiles into alignment with the training data prior to classification. The alignment is performed by moving the intensity profiles between locations using an Autoregressive Moving Average (ARMA) model. The classification results before and after alignment show a marked improvement.
利用雷达穿墙探测是一种很有价值的能力。在合成孔径雷达(SAR)配置中,通过雷达后向散射的波束形成来生成房间内部的雷达图像,这方面有相当多的工作要做。然而,高水平的场景解释是一项更加困难的任务。在之前的工作中,我们成功地使用了最小距离分类器来识别场景中的各种目标。该方法存在目标特征依赖于目标位置的问题。这项工作通过在分类之前将目标强度剖面与训练数据对齐来解决这个问题。校准是通过使用自回归移动平均(ARMA)模型在位置之间移动强度剖面来执行的。比对前后的分类结果有明显改善。
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引用次数: 3
The instagram: A novel sounding technique for enhanced HF propagation advice instagram:一种增强高频传播建议的新颖声音技术
Pub Date : 2010-05-10 DOI: 10.1109/RADAR.2010.5494387
R. I. Barnes, G. Earl, M. Papazoglou, L. Burchett, A. Terzuoli
Modern OTHR systems make extensive use of propagation support information for parameter setup advice. A novel method for increasing dimensionality and temporal resolution of this advice is demonstrated here using an instantaneously wideband waveform on a one-way path. A composite of pseudo-randomly phased, discretized, massively multi-channel signals is synthesized through a simple summing scheme. Upon reception the composite is rapidly processed in the frequency domain to produce channel scattering information simultaneously across the band. The channels may be collapsed in the Doppler domain to reduce to conventional oblique ionograms. Total integration time required to produce the full Doppler ionograms, even with low transmit powers, is reduced over conventional methods by up to three orders of magnitude leading to the term ‘Instagram’. The technique is implemented on an oblique sounding system that provides the necessary direct digital arbitrary waveform generation and reception capability. A result from the initial field trial is provided.
现代OTHR系统广泛使用传播支持信息作为参数设置建议。一种新的方法来增加维数和时间分辨率的建议,这里演示了使用单向路径上的瞬时宽带波形。通过一种简单的求和方案合成了伪随机相位、离散化、大规模多通道信号的复合信号。在接收后,在频域中对复合材料进行快速处理,以同时产生跨频带的信道散射信息。通道可能在多普勒域内塌陷,从而还原为常规的斜离子图。生成全多普勒离子图所需的总集成时间,即使在低发射功率下,也比传统方法减少了多达三个数量级,从而产生了术语“Instagram”。该技术在倾斜测深系统上实现,该系统提供了必要的直接数字任意波形产生和接收能力。给出了初步现场试验的结果。
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引用次数: 3
Automatic recognition of multiple targets with varying velocities using quadratic correlation filters and Kalman filters 基于二次相关滤波和卡尔曼滤波的变速度多目标自动识别
Pub Date : 2010-05-10 DOI: 10.1109/RADAR.2010.5494580
Andres Rodriguez, Jeffrey Panza, B. Kumar, Abhijit Mahalanobis
Automatic target recognition (ATR) systems require detection, recognition, and tracking algorithms. The classical approach is to treat these three stages separately. In this paper, we investigate a correlation filter (CF)-based approach that combines these tasks for enhanced ATR. We present a Kalman filter framework to combine information from successive correlation outputs in a probabilistic way. Our contribution is a framework that is able to locate multiple targets with different velocities at unknown positions providing enhanced ATR with only a marginal increase in computation over other CF ATR algorithms.
自动目标识别(ATR)系统需要检测、识别和跟踪算法。经典的方法是分别对待这三个阶段。在本文中,我们研究了一种基于相关滤波器(CF)的方法,该方法结合了这些任务来增强ATR。我们提出了一种卡尔曼滤波框架,以一种概率的方式组合来自连续相关输出的信息。我们的贡献是一个框架,能够在未知位置定位不同速度的多个目标,提供增强的ATR,而与其他CF ATR算法相比,计算量只增加了一点点。
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引用次数: 4
An adaptive update-rate control of a phased array radar for efficient usage of tracking tasks 相控阵雷达的自适应更新速率控制,以有效地利用跟踪任务
Pub Date : 2010-05-10 DOI: 10.1109/RADAR.2010.5494433
Sang Hoon Baek, Hyunchul Seok, Kyu Ho Park, J. Chun
In multi-functional radar, task scheduling algorithm should be designed such that timing resource is efficiently utilized by functions such as surveillance and tracking, and its performance is maximized. In the target tracking, the tasks are required to be executed to consider the maneuvering motion, measurement condition and required tracking performance. Frequent execution of tracking tasks results in not only precise tracking, but also waste of timing resource which is shared with other functions. Therefore, to reduce the number of unnecessary observations, the tracking task is required to be executed only when the update is needed. In this paper, the innovation, position residual, in Kalman filter is used as reference value for adjusting update rate of tracking tasks. Using feedback controller, the update rate is allocated so that predicted observation is expected to be within specified error range. In addition, targets are classified into 7 priorities according to tactical characteristics, and target's priority is also used as reference value for calculating update rate. The simulation results show that the proposed method reduces the tracking error of the target on maneuvering movement compared to fixed update rate case.
在多功能雷达中,要设计任务调度算法,使监视、跟踪等功能有效利用时间资源,使其性能最大化。在目标跟踪中,要求执行的任务要考虑机动运动、测量条件和所要求的跟踪性能。频繁地执行跟踪任务不仅导致跟踪不精确,而且浪费了与其他功能共享的时间资源。因此,为了减少不必要的观察次数,只需在需要更新时执行跟踪任务。本文将卡尔曼滤波的创新点——位置残差作为调整跟踪任务更新速率的参考值。利用反馈控制器分配更新速率,使预测观测值期望在指定误差范围内。此外,根据战术特点将目标划分为7个优先级,目标优先级也作为计算更新率的参考值。仿真结果表明,与固定更新率情况相比,该方法减小了目标在机动运动时的跟踪误差。
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引用次数: 7
Good code sets by spreading orthogonal vectors via Golomb rulers and Costas arrays 良好的代码集通过扩展正交向量通过Golomb标尺和Costas数组
Pub Date : 2010-05-10 DOI: 10.1109/RADAR.2010.5494464
A. Fam
Good code sets have autocorrelation functions ACF with small sidelobes, and also have small crosscorrelations. In this work, a class of good ternary codes sets are introduced. First, mutually orthogonal vectors are selected, then they are spread via a Golomb ruler. This is shown to result in such a good set. If the mutually orthogonal vectors have entries in {-1,1} or {-1,0,1}, then a ternary code set result. While there are methods of generating ternary codes, and complementary ternary codes [1–7], there is no method in prior publications of generating mutually orthogonal ternary code sets. That is one of the contributions of this work. If complex numbers with unity magnitudes are allowed, then we obtain codes with magnitudes in {0,1}. If the vectors are obtained from matrices with mutually orthogonal rows and columns, as in Hadamard matrices, or DFT matrices, then longer codes can be obtained via spreading the obtained good set via a Golomb ruler a second time. Using existing codes, such as Barker codes, and spreading them via a Golomb ruler, then compounding them with the elements of a good set, results in a new good set with higher mainlobes. The spreading could be induced via any array of any dimension with elements of magnitudes in {0,1} that have autocorrelation with unity peak sidelobes. This includes Costas arrays, in addition to Golomb rulers.
好的代码集具有小副瓣的自相关函数ACF,也具有小的互相关。本文介绍了一类良好的三元码集。首先,选择相互正交的向量,然后通过Golomb标尺进行扩展。这就得到了一个很好的集合。如果相互正交的向量在{-1,1}或{-1,0,1}中有条目,则得到一个三进制码集结果。虽然有生成三元码和互补三元码的方法[1-7],但在先前的出版物中没有生成相互正交的三元码集的方法。这是这项工作的贡献之一。如果允许使用单位大小的复数,则得到大小为{0,1}的码。如果向量是从行和列相互正交的矩阵中得到的,如在Hadamard矩阵或DFT矩阵中,那么通过第二次通过Golomb标尺扩展得到的好集可以得到更长的码。使用现有的码,如巴克码,并通过Golomb标尺传播它们,然后将它们与良集的元素组合,得到一个具有更高主叶的新良集。扩频可以通过任何维度的任何数组来诱导,这些数组的元素大小为{0,1},并且与单位峰副瓣具有自相关。这包括Costas数组,以及Golomb标尺。
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引用次数: 3
Fast computations of constant envelope waveforms for MIMO radar transmit beampattern MIMO雷达发射波束方向图恒定包络波形的快速计算
Pub Date : 2010-05-10 DOI: 10.1109/RADAR.2010.5494578
Sajid Ahmed, J. Thompson, B. Mulgrew, Y. Pétillot
Designing transmit beampattern with MIMO radars generally requires the waveforms to be able to have arbitrary cross-correlation values. In contrast to the available algorithms, the proposed technique provides a closed-form solution for the synthesis of covariance matrix, R, of the waveforms to obtain desired beampattern match. To synthesis R the constraints and redundant information in R are leveraged, which convert the constrained problem into un-constrained problem. Next a novel method for generating the constant-envelope (CE) waveforms to realise the synthesised covariance matrix, R, is proposed. This method also yields a closed-form solution and choose the symbols from the binary-phase shift-keying (BPSK). Here, Gaussian random-variables (RV's) are mapped onto the CE RV's by a memoryless non-linear transformation, which converts the problem of finding the non-Gaussian RV's to realise a given covariance matrix R into finding the Gaussian RV's to realise covariance matrix Rg. Simulation results are presented to demonstrate the effectiveness of both methodologies.
用MIMO雷达设计发射波束图通常要求波形能够具有任意的互相关值。与现有的算法相比,该技术为波形的协方差矩阵R的合成提供了一个封闭的解决方案,以获得所需的波束方向图匹配。为了综合R,利用R中的约束和冗余信息,将有约束问题转化为无约束问题。其次,提出了一种生成恒定包络(CE)波形以实现合成协方差矩阵R的新方法。该方法还产生了一个封闭形式的解,并从二相移键控(BPSK)中选择了符号。在这里,通过无记忆非线性变换将高斯随机变量映射到CE随机变量上,将查找非高斯随机变量以实现给定协方差矩阵R的问题转换为查找高斯随机变量以实现协方差矩阵Rg的问题。仿真结果验证了两种方法的有效性。
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引用次数: 1
A greedy approach for sparse angular aperture radar 稀疏角孔径雷达的贪心算法
Pub Date : 2010-05-10 DOI: 10.1109/RADAR.2010.5494538
R. Raj, V. Chen, R. Lipps
We present a novel algorithm for radar imaging of point scatterers using a sparse number of spatially separated sensors. Such sparse sensing scenarios are prototypical of many applications wherein a limited number of sensors are distributed over a geographical area; or where environmental and/or systemic constraints enforce a sparse sampling of angular aperture. Our underlying assumption is that the image is sparse with respect to the Gabor basis set. We then introduce the concept of an orbit-viz. the locus of all projections made by a spatial basis-and formulate the radar imaging problem as that of sparsifying the number of orbits that comprise the radon measurements of the source. We demonstrate how our algorithm outperforms FFT-based and Compressive-sensing based reconstruction algorithms for point-scatterer images, describe relevant theoretical performance bounds of our algorithm, and point to future research arising from this work.
提出了一种利用稀疏数量空间分离传感器对点散射体进行雷达成像的新算法。这种稀疏传感场景是许多应用的原型,其中有限数量的传感器分布在一个地理区域上;或者环境和/或系统约束强制对角孔径进行稀疏采样。我们的基本假设是图像相对于Gabor基集是稀疏的。然后我们引入轨道维兹的概念。由空间基做出的所有投影的轨迹——并将雷达成像问题表述为包含源的氡测量的轨道数量的稀疏化问题。我们展示了我们的算法如何优于基于fft和基于压缩感知的点散射图像重建算法,描述了我们算法的相关理论性能界限,并指出了这项工作中产生的未来研究。
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引用次数: 1
Radar-on-a-chip (ROACH) Radar-on-a-chip(蟑螂)
Pub Date : 2010-05-10 DOI: 10.1109/RADAR.2010.5494431
Mei Li, R. Evans, E. Skafidas, B. Moran
We discuss a single chip millimeter wave direct-conversion transceiver fabricated using 65 nm Bulk CMOS technology to produce a low power, ultra low cost radar-on-a-chip (ROACH). The proposed ROACH system operates at carrier frequencies around 77 GHz, and is capable of detecting a 0.5 square meter target at several hundred meters. We present a novel technology based radar equation, called the ROACH Equation, which presents radar performance in terms of technology parameters. In addition, building on the precise relationship between differential phase noise and coherent integration duration, we establish optimal conditions for switching between coherent integration mode and incoherent integration modes. Numerical examples demonstrate that the proposed integration scheme effectively extends the maximum detection range of the single chip radar with associated benefit of reduced computational cost and hardware implementation complexity.
我们讨论了一种采用65nm Bulk CMOS技术制造的单芯片毫米波直接转换收发器,以生产低功耗,超低成本的片上雷达(ROACH)。提议的ROACH系统在大约77 GHz的载波频率上工作,并且能够探测几百米外0.5平方米的目标。我们提出了一种新的基于技术的雷达方程,称为ROACH方程,它从技术参数的角度展示了雷达性能。此外,基于差分相位噪声与相干积分持续时间之间的精确关系,建立了相干积分模式与非相干积分模式切换的最佳条件。数值算例表明,该集成方案有效地扩展了单片雷达的最大探测距离,同时降低了计算成本和硬件实现复杂度。
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引用次数: 11
Comparison of PHD based filters for the tracking of 3D aerial and naval scenarios 基于PHD的三维空中和海上场景跟踪滤波器的比较
Pub Date : 2010-05-10 DOI: 10.1109/RADAR.2010.5494574
M. Pace
The Probability Hypothesis Density (PHD) filter is applied to realistic three-dimensional aerial and naval scenarios to illustrate its performance in detecting, initiating and terminating tracks in presence of clutter. Radar measurements are available every two seconds. A comparisons between different approximations of the PHD recursion, namely the sequential Monte Carlo and the Gaussian Mixture approximation, is given on different scenarios using the OSPA metric and different levels of clutter.
将概率假设密度(PHD)滤波器应用于真实的三维空中和海上场景,以说明其在杂波存在下的航迹检测、启动和终止性能。雷达每两秒测量一次。在使用OSPA度量和不同杂波水平的不同情况下,比较了PHD递归的不同近似,即顺序蒙特卡罗近似和高斯混合近似。
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引用次数: 6
期刊
2010 IEEE Radar Conference
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