| 1. |
- Athley, Fredrik, 1968, et al.
(författare)
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High-Resolution Space-Time Signal Processing for Radar
- 2003
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Ingår i: High-Resolution and Robust Signal Processing, To be published, Dekker, editor Y. Hua and A. Gershman and Q. Cheng. - : CRC Press. - 9781482276404
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 2. |
- Cerullo, Livia, 1982, et al.
(författare)
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Inverse scattering for a closed cavity equipped with microwave antenna sensors
- 2012
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Ingår i: AntennEMB, 5-8 March, Stockholm.
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- Pharmaceutical processes are often hosted by completely closed vessels that are difficult of access by means of measurement equipment. In particular, it is challenging to assess the interior or global process state with sensors placed on the vessel enclosing the process. This information about the process would allow for a better process monitoring and control. Here, a novel application of microwave sensing for process tomography is presented.
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| 3. |
- Chung, Pei-Jung, et al.
(författare)
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DOA Estimation Methods and Algorithms
- 2014
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Ingår i: Academic Press Library in Signal Processing: Volume 3 Array and Statistical Signal Processing. - 9780124115972 ; , s. 599-650
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Estimation of direction of arrival (DOA) from data collected by sensor arrays is of fundamental importance to a variety of applications such as radar, sonar, wireless communications, geophysics and biomedical engineering. Significant progress in the development of algorithms has been made over the last three decades. This article provides an overview of DOA estimation methods that are relevant in theory and practice. We will present estimators based on beamforming, subspace and parametric approaches and compare their performance in terms of estimation accuracy, resolution capability and computational complexity. Methods for processing broadband data and signal detection will be discussed as well. Finally, a brief discussion will be given to application specific algorithms.
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| 4. |
- Costa, Mario, et al.
(författare)
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Array Processing in the Face of Nonidealities
- 2014
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Ingår i: Academic Press Library in Signal Processing: Volume 3 Array and Statistical Signal Processing. - 9780124115972 ; , s. 819-857
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Real-world sensor arrays are typically composed of elements with individual directional beampatterns and are subject to mutual coupling, cross-polarization effects as well as mounting platform reflections. Errors in the array elements’ positions are also common in sensor arrays built in practice. Such nonidealities need to be taken into account for optimal array signal processing and in finding related performance bounds. Moreover, problems related to beam-steering and cancellation of the signal-of-interest in beamforming applications may be prevented. Otherwise, an array processor may experience a significant performance degradation. In this chapter we provide techniques that allow the practitioner to acquire the steering vector model of real-world sensor arrays so that various nonidealities are taken into account. Consequently, array processing algorithms may avoid performance losses caused by array modeling errors. These techniques include model-based calibration and auto-calibration methods, array interpolation, as well as the wavefield modeling principle or manifold separation technique. Robust methods are also briefly considered since they are useful when the array nonidealities are not described by the employed steering vector model. Extensive array processing examples related to direction-finding and beamforming are included demonstrating that optimal or close-to optimal performance may be achieved despite the array nonidealities.
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| 5. |
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| 6. |
- Holdfeldt, Peter, 1976, et al.
(författare)
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A Dynamic Programming Inspired Method for Boundary Detection in Ultrasound Image Sequences with Application to Brachial Artery Flow-Mediated Dilation (FMD) Studies
- 2009
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- This paper describes a new method for boundary detection in ultrasound image sequences with specific application to brachial artery flow-mediated dilation (FMD) studies. The method represents an extension to conventional two-dimensional dynamic programming to be applied in a three-dimensional (spatio-temporal) context. A total of 42 digital image sequences, each of which contained 240 frames, were analyzed. The majority (34) of these sequences were analyzed successfully, and a few (8) partly successful. Following automated boundary detection, vessel diameter extrema (minima and maxima) could easily be computed and used for FMD calculations. It was concluded that the new method, although optimality when moving from two to three dimensions cannot be guaranteed, outperforms conventional dynamic programming.
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| 7. |
- Jansson, M., et al.
(författare)
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Optimal Subspace Techniques for DOA Estimation
- 2005
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Ingår i: Space-Time Wireless Systems: From Array Processing to MIMO Communications / edited by Helmut Bölcskei et al..
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 8. |
- Kolomvakis, Nikolaos, 1985, et al.
(författare)
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Reconstruction of clipped signals
- 2023
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Patent (övrigt vetenskapligt/konstnärligt)abstract
- Using information contained in clipped samples from aualog-to-digital (ADC) conversion to improve receiver performance, by, for example, reducing the clipping distortion caused by ADCs due to its data resolution constraints. This provides an advantage over existing solutions, which perform suboptimally because the existing solution discard information in tire clipped samples.
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| 9. |
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| 10. |
- Lundgren, Astrid, 1978, et al.
(författare)
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Array calibration using local models
- 2006
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Ingår i: Antenn 06, Nordic Antenna Symposium. ; , s. 251-256
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)
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