Second-harmonic generation by electromagnetic waves at the surface of a semi-infinite metal

Crowne, F. J.; Fazi, C.

doi:10.1109/radar.2010.5494592

Cited by 8 publications

(9 citation statements)

References 6 publications

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“…The relationship between the electric field incident on the target E inc and the electric field reflected from the target E refl is assumed to be the standard power series model for nonlinear, memoryless targets [12][13][14][15]:…”

Section: Harmonic Phase-response Theorymentioning

confidence: 99%

Phase responses of harmonics reflected from radio-frequency electronics

et al. 2016

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The phase responses of nonlinear-radar targets illuminated by stepped frequencies are studied. Data is presented for an experimental radar and two commercial electronic targets at short standoff ranges. The amplitudes and phases of harmonics generated by each target at each frequency are captured over a 100-MHz-wide transmit band. As in the authors' prior work, target detection is demonstrated by receiving at least one harmonic of at least one transmit frequency. In the present work, experiments confirm that the phase of a harmonic reflected from a radio-frequency electronic target at a standoff distance is linear versus frequency. Similar to traditional wideband radar, the change of the reflected phase with respect to frequency indicates the range to the nonlinear target.

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Section: Harmonic Phase-response Theorymentioning

confidence: 99%

Phase responses of harmonics reflected from radio-frequency electronics

et al. 2016

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“…The reflection is transmitted back through the filter and radiates from the antenna (back towards the radar). A simple model for RF nonlinearity is the memoryless power series given by [12,13] …”

Section: Linear Vs Nonlinear Radarmentioning

confidence: 99%

“….. When the received waveform V rec is processed according to (13) and the inverse Fourier transform is computed, the result -h NL in Figure 6 -closely resembles the form of (14). The horizontal axis of the h NL plot has been mapped from time to distance by using the velocity of propagation of an RF signal in the MiniCircuits CBL-25FT coaxial lines (dielectric constant ε r ≈ 2.1): 8 1 3 10 m s 3.28 ft ft 0.34…”

Section: Measurementsmentioning

confidence: 99%

Stepped-frequency nonlinear radar simulation

et al. 2014

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RF electronic targets cannot be detected by traditional linear radar because their radar cross sections are much smaller than that of nearby clutter. One technology that is capable of separating RF electronic targets from clutter, however, is nonlinear radar. Presented in this paper is a combination of stepped-frequency ultra-wideband radar with nonlinear detection. By stepping the transmit frequency across an ultra-wide bandwidth and recording the amplitude and phase of the harmonic return signal, a nonlinear frequency response of the radar environment is constructed. An inverse Fourier transform of this response reveals the range to a nonlinear target.

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“…2f 0 , 3f 0 , 4f 0 ) [17][18][19][20][21][22][23][24][25][26] . The most common harmonic radars receive the lowest harmonic, 2f 0 , because 2f 0 tends to be the strongest of all harmonics generated by an electronic target for a given transmit frequency and power 27 .…”

Section: Introductionmentioning

confidence: 99%

Nonlinear synthetic aperture radar imaging using a harmonic radar

et al. 2015

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This paper presents synthetic aperture radar (SAR) images of linear and nonlinear targets. Data are collected using a linear/nonlinear step frequency radar. We show that it is indeed possible to produce SAR images using a nonlinear radar. Furthermore, it is shown that the nonlinear radar is able to reduce linear clutter by at least 80 dB compared to a linear radar. The nonlinear SAR images also show the system's ability to detect small electronic devices in the presence of large linear clutter. The system presented here has the ability to completely ignore a 20-inch trihedral corner reflector while detecting a RF mixer with a dipole antenna attached.

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Second-harmonic generation by electromagnetic waves at the surface of a semi-infinite metal

Cited by 8 publications

References 6 publications

Phase responses of harmonics reflected from radio-frequency electronics

Phase responses of harmonics reflected from radio-frequency electronics

Stepped-frequency nonlinear radar simulation

Nonlinear synthetic aperture radar imaging using a harmonic radar

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