&lt;title&gt;Design and performance of a polarimetric random noise radar for detection of shallow buried targets&lt;/title&gt;

Narayanan, Ram M.; Xu, Yi; Hoffmeyer, Paul D.; Curtis, John O.

doi:10.1117/12.211334

Cited by 25 publications

(11 citation statements)

References 2 publications

(2 reference statements)

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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) which can be shown to reduce to [2] Pt = (3) Let r 4 JE be the complex dielectric constant of the soil medium, from which the attenuation constant c and the phase constant /3 can be deduced. Further assume that the object is buried at a depth d, and its complex reflectivities are R exp{jçb0} and R exp{jox} for co-polarized and cross-polarized backscatter respectively.…”

Section: Theory Of White Noise Polarimetrymentioning

confidence: 99%

Enhanced detection of objects obscured by dispersive media using tailored random noise waveforms

1998

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The University of Nebraska has developed a coherent random noise radar technique that permits phase-coherent processing of random noise radar signals. This is achieved through a heterodyne correlation receiver that retains the phase of the reflected signal during the detection process. A simulation study was carried out to evaluate the system's expected performance during detection of objects buried under lossy dispersive media with different types of complex permittivity characteristics as a function of frequency. It was observed that system performance was degraded under dispersive media conditions. However, by suitably tailoring the random noise transmission characteristics to attain an inverse frequency relationship with respect to the attenuation characteristics of the media, a significant enhancement was observed in detecting obscured objects. This shows that adaptive matched illumination is useful in detecting objects buried under lossy coatings intentionally induced to inhibit detection.

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“…(+6w) = Ap exp (w0 + öw)t + -(2R + d sin 9) 3 (4) where p and çbr are the magnitude and phase of the target's reflection coefficient, respectively. The cross-correlation of the signal received by the left antenna and the phase-shifted signal received by the right antenna is given by…”

Section: Theoretical Considerationsmentioning

confidence: 99%

<title>Random noise radar interferometry</title>

1996

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A novel technique has been developed to inject coherence in an ultrawideband radar system that transmits white Gaussian random noise. Coherence is introduced in the system by performing heterodyne correlation of the received signal with the time-delayed replica of the transmit signal. This operation preserves the phase of the reflected signal which is lost in a traditional homodyne correlation receiver. Knowledge of the phase of the received signal permits the configuration of the system as a spaced antenna interferometer for azimuthal scanning and transversal speed estimation. This paper describes the basic theory of random noise radar interferometry, and presents first results obtained using the University of Nebraska's 1-2 GHz random noise radar system configured as a radar interferometer.

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

Cited by 25 publications

References 2 publications

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

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

Enhanced detection of objects obscured by dispersive media using tailored random noise waveforms

<title>Random noise radar interferometry</title>

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