Results 211 to 220 of about 120,318 (255)
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Simple Way to Resolve the Range Ambiguity
Echocardiography, 1998Purpose: The purpose of this study was to test the hypothesis that with the range gate fixed, random adjustment of the pulse repetition frequency will offer a rapid and accurate way to avoid misinterpretation of range ambiguity. Background: Traditionally, to avoid the misdiagnosis of Doppler artifacts caused by range ambiguity, time must be spent on ...
Wen-Chol, Voon +2 more
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Azimuth Phase Coding for Range Ambiguity Suppression in SAR [PDF]
IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004, 2004 A novel ambiguity suppression technique is proposed. Range ambiguities in synthetic aperture radar (SAR) images are eliminated with an azimuth filter after having applied an azimuth phase modulation to the transmitted pulses and a corresponding demodulation to the received pulses. The technique excels by actually eliminating the ambiguities rather than
Jørgen Dall
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A method of ambiguous range suppression
2018 Ural Symposium on Biomedical Engineering, Radioelectronics and Information Technology (USBEREIT), 2018A method for processing the current signal of the surveillance radar is proposed, which makes it possible to suppress marks corresponding to targets outside the range of unambiguous range measurement, as well as a mark of non-synchronous impulse noise.
V. A. Khlusov, A. V. Novikov
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Range and velocity ambiguity resolution
The Record of the 1993 IEEE National Radar Conference, 2002A clustering algorithm is compared to and found superior to the Chinese remainder theorem for resolving range ambiguities. The clustering algorithm provides a significant improvement in performance. It is demonstrated that it is easier for medium pulse repetition frequency (PRF) than for high-PRF waveforms to resolve all the range-Doppler ambiguities. >
G. Trunk, S. Brockett
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Transmit coding with a range ambiguity
2009 International Waveform Diversity and Design Conference, 2009Often a requirement of radar is a high pulse repetition frequency, as such range ambiguities are a consequence of this requirement. One approach to resolve said ambiguities is to use a non-uniform PRF. The interest in this paper is to utilize a uniform PRF and pulse diversity to resolve a single or multiple range ambiguities through temporal coding. An
James D. Jenshak, James M. Stiles
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Range ambiguities in real‐time ultrasound
Journal of Clinical Ultrasound, 1981AbstractThe frequent occurrence of low‐level artifactual echoes in normally echo‐free areas of real‐time images is shown to be due to a range‐ambiguity effect caused by the fast frame rate of real‐time equipment. The experimental data demonstrates the range‐ambiguous echoes to be present in linear array and mechanical sector scanner real‐time images ...
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A Two-Dimensional Phase Coding for Range Ambiguity Suppression
Digital Signal Processing, 2018Abstract Based on a two-dimensional phase coding, a novel range ambiguity suppression technique is proposed in this paper. By transmitting two-dimensional phase coded signals, the two-dimensional spectrum of the range ambiguous signals will be shifted along both range and azimuth directions compared with that of desired signals. Then, part of the two-
Liang Guo, Mengdao Xing, Xiang-Gen Xia
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Perceptual Ambiguity Maps for Robot Localizability With Range Perception
Expert Systems With Applications, 2017Abstract A mobile robot equipped with 2D or 3D range sensors can move without changing its range readings if the perceived environment is poor in features. This is an ambiguous situation because a single perception can be associated with several robot poses. In consequence, robot localization capability is reduced.
Gracian Triviño
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Range-ambiguous clutter characteristics in airborne FDA radar
Signal Processing, 2020Abstract Frequency diverse array (FDA) has received much attention in recent years. Different from classic phased-array (PA) that uses the same carrier frequency for all array elements, FDA adopts a small frequency increment across its array elements to produce angle, range and even time dependent transmit beampattern, which provides many promising ...
Yi-Sheng Yan +3 more
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Removal of Range Ambiguities with Orthogonal Block Coding Techniques
Circuits, Systems and Signal Processing, 2009zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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