Multipath exploitationwith adaptivewaveform design for tracking in urban terrain

Chakraborty, Bhavana; Li, Y.; Zhang, J. J.; Trueblood, T.; Papandreou-Suppappola, Antonia; Morrell, Darryl

doi:10.1109/icassp.2010.5495808

Cited by 55 publications

(48 citation statements)

References 6 publications

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“…In [14], exploitation of single bounce multipath (ghost) targets in the presence of the target LOS paths was analyzed in the SAR domain for through-the-wall sensing. The objective here unlike [5]- [12] is to reduce false positives and improve the SCR at the target location by association and mapping of the multipath [14], [15].…”

Section: A Literature On Multipath Exploitationmentioning

confidence: 99%

“…In [4] the authors use knowledge of the environment to predict multipath and improve the probability of detection of the target. In [5], the authors use the multipath and the direct LOS path to track targets in an urban canyon with a particle filter and adaptive waveform design. In [6] the LOS paths were assumed present, in addition to the double bounce multipath.…”

Section: A Literature On Multipath Exploitationmentioning

confidence: 99%

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Multipath Exploitation in Non-LOS Urban Synthetic Aperture Radar

Setlur

Negishi

Devroye

et al. 2014

IEEE J. Sel. Top. Signal Process.

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Abstract-Multipath is exploited to image targets that are hidden due to lack of line of sight (LOS) path in urban environments. Urban radar scenes include building walls, therefore creating reflections causing multipath returns. Conventional processing via synthetic aperture beamforming algorithms do not detect or localize the target at its true position. To remove these limitations, two multipath exploitation techniques to image a hidden target at its true location are presented under the assumptions that the locations of the reflecting walls are known and that the target multipath is resolvable and detectable. The first technique directly operates on the radar returns, whereas the second operates on the traditional beamformed image. Both these techniques mitigate the false alarms arising from the multipath while simultaneously permitting the shadowed target to be detected at its true location. While these techniques are general, they are examined for two important urban radar applications: detecting shadowed targets in an urban canyon, and detecting shadowed targets around corners.

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Section: A Literature On Multipath Exploitationmentioning

confidence: 99%

Section: A Literature On Multipath Exploitationmentioning

confidence: 99%

Multipath Exploitation in Non-LOS Urban Synthetic Aperture Radar

Setlur

Negishi

Devroye

et al. 2014

IEEE J. Sel. Top. Signal Process.

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“…Dual photography 5 shows one can exploit scattered light to recover two-dimensional (2D) images of objects illuminated by a structured dynamic light source and hidden from the camera. Time-gated viewing using mirror reflections allows imaging around corners, for example, from a glass window [6][7][8] . Three bounce analysis of a time-of-flight camera can recover hidden 1-0-1 planar barcodes 9,10 but the technique assumes well-separated, isolated hidden patches with known correspondence between hidden patches and recorded pulses.…”

mentioning

confidence: 99%

Recovering three-dimensional shape around a corner using ultrafast time-of-flight imaging

et al. 2012

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The recovery of objects obscured by scattering is an important goal in imaging and has been approached by exploiting, for example, coherence properties, ballistic photons or penetrating wavelengths. Common methods use scattered light transmitted through an occluding material, although these fail if the occluder is opaque. Light is scattered not only by transmission through objects, but also by multiple reflection from diffuse surfaces in a scene. This reflected light contains information about the scene that becomes mixed by the diffuse reflections before reaching the image sensor. This mixing is difficult to decode using traditional cameras. Here we report the combination of a time-of-flight technique and computational reconstruction algorithms to untangle image information mixed by diffuse reflection. We demonstrate a three-dimensional range camera able to look around a corner using diffusely reflected light that achieves sub-millimetre depth precision and centimetre lateral precision over 40 cm× 40 cm×40 cm of hidden space.

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“…Because radar signals are reflected by multiple ionospheric layers, a number of techniques have been developed over the years to exploit the rich multipath propagation associated with moving targets to improve the target localization and tracking performance [4][5][6]. Multipath exploitation radar is also found in other applications, such as through-the-wall and urban terrain sensing [7,8].…”

Section: Introductionmentioning

confidence: 99%

Instantaneous altitude estimation of maneuvering target in over-the-horizon radar exploiting multipath Doppler signatures

Zhang

Amin

et al. 2013

EURASIP J. Adv. Signal Process.

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Over-the-horizon radar systems are capable of localizing targets in range and azimuth but are unable to achieve reliable altitude estimation. Past work has shown that the time-varying Doppler signatures of micro-multipath signals provide rich information for reliable estimation of altitude changes. In this paper, we develop a new technique for the estimation of instantaneous altitude of maneuvering targets by exploiting the estimated multicomponent Doppler signatures. A key contribution of this paper is to apply effective non-stationary signal analysis techniques for estimating the time-varying Doppler signature of each individual multipath. This enables reliable target altitude estimation in an extended Kalman filter setup. The maximum a-posteriori criterion is used for the estimation of initial target states.

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Multipath exploitationwith adaptivewaveform design for tracking in urban terrain

Cited by 55 publications

References 6 publications

Multipath Exploitation in Non-LOS Urban Synthetic Aperture Radar

Multipath Exploitation in Non-LOS Urban Synthetic Aperture Radar

Recovering three-dimensional shape around a corner using ultrafast time-of-flight imaging

Instantaneous altitude estimation of maneuvering target in over-the-horizon radar exploiting multipath Doppler signatures

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