Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
Research output: Contribution in Book/Report/Proceedings - With ISBN/ISSN › Conference contribution/Paper › peer-review
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TY - GEN
T1 - Oblique ionogram features associated with off-great-circle HF propagation at high latitudes
AU - Rogers, Neil
AU - Warrington, Michael
AU - Jones, Tudor
PY - 2001
Y1 - 2001
N2 - The presence of horizontal electron density gradients and irregularities in the ionosphere cause HF radio signals to deviate from the great-circle path joining transmitter and receiver. Such deviations have serious implications for the operation of position location systems operating within the HF band. In order to investigate the nature of these large scale bearing deviations and to relate them to the mode content of the signal, various experiments have been undertaken over paths for which simultaneous bearing measurements and forward oblique soundings were available. Two types of measurement are examined in this paper. In the first type, the soundings were made over the full HF band at 30 minute intervals together with the bearing measurements at 90 second intervals at three fixed frequencies. These measurements were obtained over two paths in Canada. In the second type of experiment, the bearing measurements were made on the sounder signal itself (a so-called sweeping-DF measurement). These latter experiments are similar to those made with an interferometric DF system which have previously been reported by Black et al. (1993, 1995), however in this instance a goniometric DF system was employed
AB - The presence of horizontal electron density gradients and irregularities in the ionosphere cause HF radio signals to deviate from the great-circle path joining transmitter and receiver. Such deviations have serious implications for the operation of position location systems operating within the HF band. In order to investigate the nature of these large scale bearing deviations and to relate them to the mode content of the signal, various experiments have been undertaken over paths for which simultaneous bearing measurements and forward oblique soundings were available. Two types of measurement are examined in this paper. In the first type, the soundings were made over the full HF band at 30 minute intervals together with the bearing measurements at 90 second intervals at three fixed frequencies. These measurements were obtained over two paths in Canada. In the second type of experiment, the bearing measurements were made on the sounder signal itself (a so-called sweeping-DF measurement). These latter experiments are similar to those made with an interferometric DF system which have previously been reported by Black et al. (1993, 1995), however in this instance a goniometric DF system was employed
U2 - 10.1049/cp:20010314
DO - 10.1049/cp:20010314
M3 - Conference contribution/Paper
SN - 0852967330
VL - 1
T3 - IEE Conference Publication
SP - 398
EP - 402
BT - Eleventh International Conference on Antennas and Propagation, 2001
PB - IEE
CY - London
T2 - Eleventh international conference on antennas and propagation
Y2 - 17 April 2001 through 20 April 2001
ER -