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检索条件"主题词=Virtual array"

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Spread Spectrum Digital Beamforming virtual array and Scalability to Millimeter Wavelength Frequencies

Spread Spectrum Digital Beamforming Virtual Array and Scalab...

引用

5th IEEE International Symposium on Phased array Systems and Technology

作者： Bergamo, Marcos A. Weedon, William H. Intelligent Automat Inc Rockville MD 20855 USA Appl Radar Inc North Kingstown RI USA

ISBN: (纸本)9781467311274

This paper describes a millimeter-wave spread spectrum digital beamforming (MMW-SSDBF) technique employing large-aperture 2D MIMO virtual arrays. The MIMO array utilizes truly shift-orthogonal (TSOC) radar waveforms in order to significantly reduce hardware complexity, thereby enabling implementation of the low-cost wafer array. The architecture utilizes simple branch-line coupler bi-phase modulators per element to implement the beamforming operations, with a single digital transceiver for the whole array.

关键词： spread spectrum digital beamforming MIMO virtual array TSOC

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SUPPER RESOLUTION RADAR IMAGING: A virtual array CONCEPT APPROACH

SUPPER RESOLUTION RADAR IMAGING: A VIRTUAL ARRAY CONCEPT APP...

引用

IEEE International Geoscience and Remote Sensing Symposium (IGARSS)

作者： Lv, Gaohuan Wang, Kaizhi Liu, Xingzhao Yu, Wenxian Shanghai Jiao Tong Univ Dept Elect Engn Shanghai Peoples R China

ISBN: (纸本)9781457710056

A virtual array concept is proposed to get supper-resolution in synthetic aperture radar imagery. Two kinds of virtual arrays called virtual frequency array and virtual azimuth array are constructed, combining with phased array signal processing methods, to bring out better imaging performance than traditional range-Doppler and reciprocal spectrum algorithms used in previous literatures.

关键词： Synthetic Aperture Radar virtual array Beamforming

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Extending ESPRIT algorithm by using virtual array and Moore-Penrose general inverse techniques

Extending ESPRIT algorithm by using virtual array and Moore-...

引用

IEEE Southeastcon 99 Conference on Technology on the Brink of 2000

作者： Wang, S Zhou, XL Shanghai Jiao Tong Univ Dept Elect Engn Shanghai Peoples R China

ISBN: (纸本)0780352378

High-resolution signal parameter estimation is frequently studied in many signal processing applications. In this paper, we present a new high-resolution direction and frequency simultaneous estimation algorithm, which extends ESPRIT algorithm by using Moore-Penrose general inverse and virtual array techniques. By using this new algorithm, the parameter pair (theta(i), f(i)) of each source can be easily obtained and automatically combined from the eigenvectors and eigenvlues. The proposed approach is simple and direct, and does not require a search procedure. It can even work well with only two sensors, no matter how many sources it is detecting. Computer simulation results are also presented to demonstrate the performance of the proposed approach.

关键词： array signal processing ESPRIT algorithm DOA estimation frequency estimation virtual array Moore-Penrose general inverse

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COPRIME array ADAPTIVE BEAMFORMING BASED ON COMPRESSIVE SENSING virtual array SIGNAL 41

COPRIME ARRAY ADAPTIVE BEAMFORMING BASED ON COMPRESSIVE SENS...

引用

41st IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

作者： Gu, Yujie Zhou, Chengwei Goodman, Nathan A. Song, Wen-Zhan Shi, Zhiguo Georgia State Univ Dept CS Atlanta GA 30329 USA Zhejiang Univ Coll ISEE Hangzhou 310027 Zhejiang Peoples R China Univ Oklahoma Sch ECE Norman OK 73019 USA Univ Oklahoma ARRC Norman OK 73019 USA

ISBN: (纸本)9781479999880

In this paper, we propose a novel adaptive beamforming algorithm for coprime array by compressive sensing the virtual uniform linear array signal. Based on the idea of coprime sampling, a much longer virtual uniform linear array can be generated from a coprime array. With a compressive sensing matrix, a connection can be built between the coprime array with fewer physical sensors and the virtual uniform linear array with much more virtual sensors. Hence, the proposed adaptive beamforming algorithm takes full advantage of the longer virtual array. The performance increment provided by the virtual array is much larger than the performance loss due to the introduced compressive sensing. Hence, the beamformer using the virtual array is expected to obtain much better performance than those using the coprime array directly. Simulation results demonstrate the effectiveness of the proposed adaptive beamforming algorithm.

关键词： Adaptive beamforming compressive sensing coprime array virtual array

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Waveform Degradation of the MIMO virtual array

Waveform Degradation of the MIMO Virtual Array

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IEEE Radar Conference (RadarConf)

作者： Jackson, Matthew J. Melvin, William L. Williams, Douglas B. Georgia Inst Technol Georgia Tech Res Inst Atlanta GA 30332 USA Georgia Inst Technol Sch Elect & Comp Engn Atlanta GA 30332 USA

ISBN: (纸本)9798350329216;9798350329209

Under scenarios with sufficient signal power, coherent multiple-input multiple-output (MIMO) radar potentially offers enhanced detection and estimation performance compared to the traditional phased array due to the formation of a virtual array. While performance is well-documented for ideal orthogonal waveforms, these assumptions do not hold in deployment of realistic MIMO systems, where processing errors and waveform cross-correlation complex-valued cross terms are introduced. The latter is shown to introduce angle- and timevarying changes to the transmit gain, perceivable as a steering vector mismatch in virtual array beamforming. This paper highlights the effects of virtual array phase errors caused by unintended spatial interactions of non-orthogonal waveforms and provides considerations for MIMO array placement.

关键词： coherent MIMO radar non-orthogonal waveforms virtual array MIMO transmit gain

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A Modified virtual array ESPRIT Algorithm Based on Real Signal Subspace

A Modified Virtual Array ESPRIT Algorithm Based on Real Sign...

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International Symposium on Antennas and Propagation (ISAP)

作者： Liu Ning Shi Haoshan Liu Liping Yang Bo Firat Univ Dept 1 Elazig Turkey Northwestern Polytech Univ Sci & Technol UAV Lab Xian 710065 Peoples R China Northwestern Polytech Univ Dept Elect Engn Xian 710072 Peoples R China ZTE Xian Inst Xian 710065 Peoples R China

ISBN: (纸本)9781479923441

A new ESPRIT method based on virtual array in the presence of coherent signals is presented. Using the received dates and its conjugate information, we reconstructed array data matrix. To reduce the complexity of algorithm, a real signal subspace can be obtained by a unitary transformation. Using the modified U-VC-ESPRIT which has small amount of calculation, we estimated DOA of non-circular coherent signal with arbitrary phase without array aperture reduction and effective element loss. The simulation results verified the effectiveness and superiority of the algorithm.

关键词： DOA virtual array Unitary ESPRIT coherent signals

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Broadband Incoherent virtual array Beamforming on Small-Scale array for Passive Detection

Broadband Incoherent Virtual Array Beamforming on Small-Scal...

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Oceans Conference

作者： Dong Weijia Sheng Xueli Sun Chunyan Lu Jia Shen Hu Zhang Jiarong Harbin Engn Univ Sci & Technol Underwater Acoust Lab Harbin Heilongjiang Peoples R China

ISBN: (纸本)9781479936465

It cannot be guaranteed that array spacing corresponding to half-wavelength of each frequency when broadband signals are processed by passive detection scheme. Therefore, for high-frequency, side lobe will rise when array spacing is half the wavelength of the low-frequency. In addition, the main lode of small-scale array will be wider due to limited array aperture. In order to resolve these two disadvantages for passive detection of small-scale array, virtual array beamforming based on time-delay information is studied in this paper. But this technology often requires high sampling frequency which will increase computational complexity. In order to use virtual array beamforming to processing broadband signals at lower sampling frequency, broadband incoherent virtual array technology based on phase information is introduced in this paper. The effectiveness of these two methods is shown by simulation and sea experiment.

关键词： passive detection virtual array small-scale broadband incoherent

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Transmission Error Correction Using Overlapping Elements in virtual array of MIMO Radar

Transmission Error Correction Using Overlapping Elements in ...

引用

International Symposium on Antennas and Propagation (ISAP)

作者： Kato, Hidetaka Kikuma, Nobuyoshi Sakakibara, Kunio Nagoya Inst Technol Dept Elect & Mech Engn Nagoya Aichi 4668555 Japan

ISBN: (纸本)9788957083048

In the MIMO radar using the transmission antenna switching, the phase and amplitude errors in the transmission signals may yield deterioration of the estimation accuracy of target directions. In this paper, we introduce overlapping elements in the virtual array of MIMO radar, and we improve the estimation accuracy by correcting transmission signal errors with the overlapping elements.

关键词： MIMO radar virtual array transmission antenna switching transmission signal errors overlapping elements

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Toeplitz Matrix Reconstruction of Interpolated Coprime virtual array for DOA Estimation 85

Toeplitz Matrix Reconstruction of Interpolated Coprime Virtu...

引用

IEEE 85th Vehicular Technology Conference (VTC Spring)

作者： Fan, Xing Zhou, Chengwei Gu, Yujie Shi, Zhiguo Zhejiang Univ Coll Informat Sci & Elect Engn Hangzhou 310027 Zhejiang Peoples R China Temple Univ Dept Elect & Comp Engn Philadelphia PA 19122 USA

ISBN: (纸本)9781509059324

A coprime array enables an increased number of degrees-of-freedom by deriving a non-uniform virtual array. However, existing work such as spatial smoothing fails to utilize all of the information provided by the coprime array, which results in performance loss. In this paper, we propose a novel coprime virtual array interpolation-based direction-of-arrival (DOA) estimation algorithm by Toeplitz matrix reconstruction. After investigating the challenges caused by the non-uniformity, we introduce the idea of array interpolation to construct a uniform linear virtual array, such that the information contained in the coprime virtual array can be fully utilized. According to the statistics of non-uniform coprime virtual array signal, we formulate a convex optimization problem for DOA estimation by reconstructing the covariance matrix of the equivalent received signals of the interpolated coprime virtual array under the Toeplitz constraint. Simulation results demonstrate the effectiveness of the proposed algorithm.

关键词： Coprime array direction-of-arrival estimation interpolation Toeplitz matrix reconstruction virtual array

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Single Vector Hydrophone Positioning of Moving Sources Based on virtual array 9

Single Vector Hydrophone Positioning of Moving Sources Based...

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9th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI)

作者： Han, Chuang Dong, Jingwei Li, Guodong Lan, Chaofeng Guo, Xiaoxia Harbin Univ Sci & Technol Higher Educ Key Lab Measuring & Control Technol & Harbin Peoples R China Harbin Univ Sci & Technol Sch Elect & Elect Engn Harbin Peoples R China Harbin Engn Univ Coll Underwater Acoust Engn Harbin Peoples R China

ISBN: (纸本)9781509037100

This paper proposed a high resolution algorithm using single vector hydrophone based on moving sources passing characteristic measuring system. The algorithm transfers the time domain result of the hydrophones into virtual array with spatial distribution characteristics and specified interval between array elements. With the virtual array, positioning with high resolution can be obtained by the algorithm MUSIC. In the paper, numerical simulation was implemented to analyze the performance of this positioning method on non-coherent sources and coherent sources. The output showed that virtual array had an analogical positioning result with actual array, which could be an effective positioning method.

关键词： vector hydrophone high resolution algorithm virtual array

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