2015
DOI: 10.1016/j.nima.2015.05.072
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Design, construction and operation of a low-power, autonomous radio-frequency data-acquisition station for the TARA experiment

Abstract: Employing a 40-kW, 54.1 MHz radio-frequency transmitter just west of Delta, UT, the TARA (Telescope Array RAdar) experiment seeks radar detection of extensive air showers (EAS) initiated by ultra-high energy cosmic rays (UHECR). For UHECR with energies in excess of 10 19 eV, the Doppler-shifted "chirps" resulting from EAS shower core radar reflections should be observable above background (dominantly galactic) at distances of tens of km from the TARA transmitter. In order to stereoscopically reconstruct cosmic… Show more

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Cited by 13 publications
(8 citation statements)
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“…These triggers will be trained against the surface detector trigger to determine their efficacy for eventual use in the successor neutrino detector, where the radar signal itself must trigger the DAQ. One such trigger under investigation is a heterodyne trigger (also called a "chirp trigger") based upon a method developed for the TARA remote stations [37,38] that exploits the frequency shift of the return signal. The geometry of RET-CR is such that all of the received radar echoes will exhibit this frequency shifting behavior.…”
Section: Data Acquisition Systemmentioning
confidence: 99%
“…These triggers will be trained against the surface detector trigger to determine their efficacy for eventual use in the successor neutrino detector, where the radar signal itself must trigger the DAQ. One such trigger under investigation is a heterodyne trigger (also called a "chirp trigger") based upon a method developed for the TARA remote stations [37,38] that exploits the frequency shift of the return signal. The geometry of RET-CR is such that all of the received radar echoes will exhibit this frequency shifting behavior.…”
Section: Data Acquisition Systemmentioning
confidence: 99%
“…For geometries where the TX-PSP baseline is much greater than the length of the shower itself, the 'chirp' is replaced by a CW return at a shifted frequency away from the carrier. Experimentally, such a unique signal can be used to advantage in a low signal-to-noise trigger, as in [29] [30]. The phase relationships between reflections from different parts of the plasma as it progresses through 4-space result in a coherent frequency shift of the received signal, even though none of the scatterers themselves have any appreciable 3-velocity, and the interrogating radio is monochromatic.…”
Section: Example Signalmentioning
confidence: 99%
“…These triggers will be trained against the surface detector trigger to determine their efficacy for eventual use in the successor neutrino detector, where the radar signal itself must trigger the DAQ. One such trigger under investigation is a heterodyne trigger (also called a "chirp trigger") based upon a method developed for the TARA remote stations [48,49] that exploits the frequency shift of the return signal. The geometry of RET-CR is such that all of the received radar echoes will exhibit this frequency shifting behavior.…”
Section: Data Acquisition Systemmentioning
confidence: 99%