Respiratory Monitoring and Clutter Rejection Using a CW Doppler Radar With Passive RF Tags

Singh, Aditya; Lubecke, Victor M.

doi:10.1109/jsen.2011.2134083

Cited by 92 publications

(46 citation statements)

References 20 publications

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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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Section: Introductionmentioning

confidence: 99%

Nonlinear synthetic aperture radar imaging using a harmonic radar

et al. 2015

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“…Reception and subsequent processing of a harmonic return signal enables detection and ranging of a nonlinear target, hence the term "nonlinear radar". Filtering and amplification in the receive chain are separated into multiple stages because nonlinear target responses are generally very weak [1,2,3]. Also, in current literature, harmonic radar is typically narrowband [1,2,3,4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

“…Filtering and amplification in the receive chain are separated into multiple stages because nonlinear target responses are generally very weak [1,2,3]. Also, in current literature, harmonic radar is typically narrowband [1,2,3,4,5,6,7]. For narrowband systems, target detection and classification are possible, but unless a collection of antennas or a mobile platform is implemented [8], range information is not available.…”

Section: Introductionmentioning

confidence: 99%

Short-range harmonic radar: chirp waveform, electronic targets

et al. 2015

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Radio-frequency (RF) electronic targets, such as man-portable electronics, cannot be detected by traditional linear radar because the radar cross section of those targets is much smaller than that of nearby clutter. One technology that is capable of separating RF electronic targets from naturally-occurring clutter is nonlinear radar.Presented in this paper is the evolution of nonlinear radar at the United States Army Research Laboratory (ARL) and recent results of short-range over-the-air harmonic radar tests there. For the present implementation of ARL's nonlinear radar, the transmit waveform is a chirp which sweeps one frequency at constant amplitude over an ultra-wide bandwidth (UWB). The receiver captures a single harmonic of this entire chirp. From the UWB received harmonic, a nonlinear frequency response of the radar environment is constructed. An inverse Fourier Transform of this nonlinear frequency response reveals the range to the nonlinear target within the environment. The chirped harmonic radar concept is validated experimentally using a wideband horn antenna and commercial off-the-shelf electronic targets.

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“…Depending on the application and technology, the used fundamental frequency varies. In RECCO avalanche detectors [7], a fundamental frequency of 0.917 GHz is used, whereas other technologies [8,9] operate using maritime radar frequencies (f 0 ≈ 9.4 GHz) or at the ISM band (f 0 being, e.g., 2.45, 5.8, or 5.9 GHz [10][11][12]). One particular challenge for practical, commercial harmonic transponder applications and their widespread use is finding a suitable frequency pair that complies with existing frequency allocations simultaneously at both frequencies.…”

Section: Introductionmentioning

confidence: 99%

Harmonic Transponders: Performance and Challenges

Rasilainen¹,

Ilvonen²,

Lehtovuori³

et al. 2015

PIER M

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Abstract-Performance of a harmonic transponder strongly depends on the properties of the antenna and diode used, which makes finding a good combination of them very important. For a transponder with a fixed antenna geometry, the effect of different diodes is analyzed through electromagnetic simulations and theoretical calculations. The antenna used in the transponder is directly matched to the impedance properties of a particular diode. Effects of both detector and varactor diodes on the return loss characteristics of the antenna and the obtainable transponder response are observed. Criteria for selecting a suitable diode are given. Benefits and drawbacks of using different antenna matching techniques are discussed, and principal design steps are given both for transponders matched directly to the antenna and for transponders with external matching circuits.

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Respiratory Monitoring and Clutter Rejection Using a CW Doppler Radar With Passive RF Tags

Cited by 92 publications

References 20 publications

Nonlinear synthetic aperture radar imaging using a harmonic radar

Nonlinear synthetic aperture radar imaging using a harmonic radar

Short-range harmonic radar: chirp waveform, electronic targets

Harmonic Transponders: Performance and Challenges

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