Simulation of a polarimetric random noise/spread spectrum radar for subsurface probing applications

Narayanan, Ram M.; Xu, Yi; Rhoades, D.W.

doi:10.1109/igarss.1994.399779

Cited by 8 publications

(4 citation statements)

References 2 publications

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“…Pt=p;- (2) which can be shown to reduce to [2] Pt=k (3) Let Er €. j€ be the complex dielectric constant of the soil medium, from which the attenuation constant c and the phase constant /3 can be deduced.…”

Section: Phasementioning

confidence: 99%

<title>Random-noise polarimetry applications to subsurface probing</title>

Narayanan

Hoffmeyer

et al. 1996

SPIE Proceedings

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Random noise polarimetry is a new radar technique for high-resolution probing of subsurface objects and interfaces. Detection of buried targets is accomplished by cross-correlating the reflected signal by a time-delayed replica of the transmitted waveform. A unique signal processing scheme is used to inject coherence in the system to permit extraction of the wideband polarimetric scattering response of the buried object. This facilitates computation of the Stokes matrices of the target response which enhances the detection and identification process. Random noise polarimetry also possesses additional desirable features for subsurface probing such as immunity from detection and jamming. The paper discusses the theoretical foundations of random noise polarimetry and presents data acquired from various targets using a 1-2 GHz radar system fabricated by the University of Nebraska under contract to the U.S. Army Waterways Experiment Station. In addition, various signal processing algorithms used to analyze the polarimetric data are presented.

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Section: Phasementioning

confidence: 99%

<title>Random-noise polarimetry applications to subsurface probing</title>

Narayanan

Hoffmeyer

et al. 1996

SPIE Proceedings

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“…(2) where R0 is the characteristic system impedance, and a bar over a variable denotes its time average value. Since a(t) and 6w(t) are uncorrelated, we can write v(t) = a2(t)cos2{(c,i0 + 6w)t} = .…”

Section: Theoretical Analysismentioning

confidence: 99%

<title>Design and performance of a polarimetric random noise radar for detection of shallow buried targets</title>

Narayanan

Hoffmeyer

et al. 1995

SPIE Proceedings

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A novel polarimetric ultra-wideband radar system operating in the 1-2 GHz frequency range for subsurface probing applications is currently under development at the University of Nebraska. The radar system transmits white Gaussian noise. Detection and localization of buried objects is accomplished by correlating the reflected waveform with a time-delayed replica of the transmitted waveform. Broadband dual-polarized log-periodic antennas are used for transmission and reception. A unique signal processing scheme is used to obtain the target's polarimetric amplitude and phase response by frequency translation of the ultra-wideband signal by a coherent 160 MHz phase-locked source. In addition, the radar system features high depth resolution, low bandwidth-duration product, as well as simplified signal processing. This paper describes the unique design features of the radar system, develops the theoretical foundations of noise polarimetry, and provides experimental evidence of the polarimetric and resolution capabilities of the system.

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“…Various computer simulations were performed to evaluate the performance of the radar system design. 2 These simulations were performed for various combinations of soil type, soil moisture, depth of target burial, and polarimetric response of the buried target. Ground reflections as well as uncorrelated system noise were added to the received signal to simulate realistic field conditions.…”

Section: Results Of Simulation Studymentioning

confidence: 99%

Design, performance, and applications of a coherent ultra-wideband random noise radar

et al. 1998

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A novel coherent ultra-wideband radar system operating in the 1-to 2-GHz frequency range has been developed recently at the University of Nebraska. The radar system transmits white Gaussian noise. Detection and localization of buried objects is accomplished by correlating the reflected waveform with a time-delayed replica of the transmitted waveform. Broadband dual-polarized log-periodic antennas are used for transmission and reception. A unique signal-processing scheme is used to inject coherence into the system by frequency translation of the ultrawideband signal by a coherent 160-MHz phase-locked source prior to performing heterodyne correlation. The system coherence allows the extraction of a target's polarimetric amplitude and phase characteristics. This paper describes the unique design features of the radar system, develops the theoretical foundations of noise polarimetry, provides experimental evidence of the polarimetric and resolution capabilities of the system, and demonstrates results obtained in subsurface probing applications.

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Simulation of a polarimetric random noise/spread spectrum radar for subsurface probing applications

Cited by 8 publications

References 2 publications

<title>Random-noise polarimetry applications to subsurface probing</title>

<title>Random-noise polarimetry applications to subsurface probing</title>

<title>Design and performance of a polarimetric random noise radar for detection of shallow buried targets</title>

Design, performance, and applications of a coherent ultra-wideband random noise radar

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