1982
DOI: 10.1016/0021-9169(82)90051-4
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A theoretical and experimental investigation of antenna near-field effects as applied to incoherent backscatter measurements at Arecibo

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Cited by 23 publications
(20 citation statements)
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“…3 encounter. This is not surprising given that these meteor returns are no more than about 30 dB(K) above the noise floor and that the second ring-lobe of the AO beam is about -24 dBi at about 0.9 km from the beamcenter (Breakall and Mathews 1982). That is, since the return power depends on gain-squared (see Eq.…”
Section: Observationsmentioning
confidence: 77%
See 1 more Smart Citation
“…3 encounter. This is not surprising given that these meteor returns are no more than about 30 dB(K) above the noise floor and that the second ring-lobe of the AO beam is about -24 dBi at about 0.9 km from the beamcenter (Breakall and Mathews 1982). That is, since the return power depends on gain-squared (see Eq.…”
Section: Observationsmentioning
confidence: 77%
“…Viewed in this fashion, the m e t e o r shown in Fig. 1 -- , where we have used the m e a s u r e d system p a r a m e t e r s for system temperature (70 K), noise b a n d w i d t h (1 MHz), and transmitter power (2 MW), a m e a n range of 95 km, and an inferred peak gain at this near-field range of 60 dBi (Breakall and Mathews 1982). Hypothesizing that the 2.0 x 10 -8 m 2 scat- tering cross-section corresponds to the geometric area/ volume corresponding to the plasma head of the meteor, we find that at a mass density of 3 g/cm3--to be discussed later--the apparent mass of the Fig.…”
Section: Observationsmentioning
confidence: 99%
“…The Arecibo antenna gain pattern used in this work is a simplified version of the one reported by Breakall and Mathews (1982). Here we use two Gaussian distributions, one for the radar main beam, and the other for the first ring lobe.…”
Section: Conduct Meteor Simulation To Find the Most Likely Observatiomentioning
confidence: 99%
“…For example, the Dregion ledge is easily visible to this radar (Mathews, 1984) as are D-region tidal winds (Mathews, 1976) and continuous "sporadic-E" (Morton et al, 1993;Mathews, 1998). Also, interestingly and uniquely for the incoherent scatter radars, near-field effects for this feed illuminating the 305 m dish are important up to approximately 300 km, resulting in significant corrections to the incoherent scatter radar equation (Breakall and Mathews, 1982;Shen and Brice, 1973). Early results using the new linefeed were given by Behnke and Harper (1973) and others.…”
Section: The Aio 430 Mhz Radarmentioning
confidence: 95%