NEC - Numerical electromagnetics code for antennas and scattering

Burke, G.J.; Poggio, A.J.; Logan, J. C.; Rockway, J. W.

doi:10.1109/aps.1979.1148131

Cited by 60 publications

(28 citation statements)

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“…Electron lifetime as a function of altitude comes from Vidmar [20]. Transmitter and receiver radiation patterns have been simulated [32] and confirmed observationally (see [8]). …”

Section: Simulationmentioning

confidence: 69%

“…Transmitter forward gain is modelled as a function of angle by Numerical Electromagnetics Code [32] (NEC), which has been confirmed by direct measurements as an accurate representation of the relative gain to within 10% [8]. The receiver gain is also modeled using NEC, at 54.1 MHz.…”

Section: Systematic Uncertaintiesmentioning

confidence: 88%

“…Bottom: Electron lifetime is determined from empirical models and RCS comes from the thin-wire approximation and shower evolution models. Antenna gain is determined from lookup tables generated by NEC [32]. This configuration simulates a cosmic ray radar echo.…”

Section: Radar Receiver and Daqmentioning

confidence: 99%

See 2 more Smart Citations

First upper limits on the radar cross section of cosmic-ray induced extensive air showers

Abbasi¹,

Abe²,

Othman³

et al. 2017

Astroparticle Physics

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TARA (Telescope Array Radar) is a cosmic ray radar detection experiment colocated with Telescope Array, the conventional surface scintillation detector (SD) and fluorescence telescope detector (FD) near Delta, Utah, U.S.A. The TARA detector combines a 40 kW, 54.1 MHz VHF transmitter and high-gain transmitting antenna which broadcasts the radar carrier over the SD array and within the FD field of view, towards a 250 MS/s DAQ receiver. TARA has been collecting data since 2013 with the primary goal of observing the radar signatures of extensive air showers (EAS). Simulations indicate that echoes are expected to be short in duration (∼ 10 µs) and exhibit rapidly changing frequency, with rates on the order 1 MHz/µs. The EAS radar cross-section (RCS) is currently unknown although it is the subject of over 70 years of speculation. A novel signal search technique is described in which the expected radar echo of a particular air shower is used as a matched filter template and compared to waveforms obtained by triggering the radar DAQ using the Telescope Array fluorescence detector. No evidence for the scattering of radio frequency radiation by EAS is obtained to date. We report the first quantitative RCS upper limits using EAS that triggered the Telescope Array Fluorescence Detector.

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“…Electron lifetime as a function of altitude comes from Vidmar [20]. Transmitter and receiver radiation patterns have been simulated [32] and confirmed observationally (see [8]). …”

Section: Simulationmentioning

confidence: 69%

Section: Systematic Uncertaintiesmentioning

confidence: 88%

See 1 more Smart Citation

First upper limits on the radar cross section of cosmic-ray induced extensive air showers

Abbasi¹,

Abe²,

Othman³

et al. 2017

Astroparticle Physics

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show abstract

“…These plots show the gain of each full array with respect to an isotropic antenna for particular beamformer steer conditions. They have been computed using NEC [13] modelling of each complete array. Figure 4 shows the gain G t (θ, φ; ψ t ) (in dBi) of the transmitter array for the case of beamformer steer direction ψ t = −5 o while Figure 5 shows the gain of the receiver array G r (θ, φ; ψ r ) for a single receiver beam case of beamformer steer direction ψ r = −20 o .…”

Section: Coveragementioning

confidence: 99%

Decametric measurements of the ISS using an experimental HF line-of-sight radar

Frazer

Meehan

Warne

2013

2013 International Conference on Radar

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A DSTO developed high-frequency line-of-sight radar operating at a wavelength of approximately one decametre has been used to make radar measurements of the International Space Station. The radar is described and ISS detection considered. Measurements from the radar are used to estimate the maximum radar cross section of the ISS and to compute an improved ephemeris for the orbit of the ISS compared to the NORAD published ephemeris used as an initial estimate. The accuracy of the orbit determination and the wider suitability of this sensor design for measuring low-Earth orbiting object trajectories are discussed.

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“…In the single objective version of the problem, the aim is to maximise the efficiency of the antenna. This is a form of black box optimisation as this characteristic is evaluated by the NEC [12] software suite.…”

Section: Aco Applied To Constructing Rfid Antennasmentioning

confidence: 99%

Pheromone Pre-seeding for the Construction of RFID Antenna Structures Using ACO

Weis

Lewis

Randall

et al. 2010

2010 IEEE Sixth International Conference on E-Science

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Abstract-Ant colony optimisation is often used to construct solutions to problems for which it has no a-priori knowledge. However, decision makers and designers often have insight and practical experience concerning what constitutes good and acceptable solutions. In this paper we exploit this knowledge by applying a pre-seeding procedure to the initial pheromone structure. Using the real-world RFID antenna design problem, we show that very good solutions can be produced. Moreover, this technique allows fine tuning of the search procedure.

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NEC - Numerical electromagnetics code for antennas and scattering

Cited by 60 publications

References 0 publications

First upper limits on the radar cross section of cosmic-ray induced extensive air showers

First upper limits on the radar cross section of cosmic-ray induced extensive air showers

Decametric measurements of the ISS using an experimental HF line-of-sight radar

Pheromone Pre-seeding for the Construction of RFID Antenna Structures Using ACO

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