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Author | : B. S. Dandekar |
Publisher | : |
Total Pages | : 238 |
Release | : 1995 |
Genre | : Ionospheric forecasting |
ISBN | : |
Download Improvement of Real Time F0F2 Prediction for OTH Radars Book in PDF, ePub and Kindle
Author | : B. S. Dandekar |
Publisher | : |
Total Pages | : 45 |
Release | : 1995 |
Genre | : Over-the-horizon radar |
ISBN | : |
Download Improvement of Real Time F0F2 Prediction for OTH Radars Book in PDF, ePub and Kindle
Dandekar and Buchau (1986) presented an empirical algorithm for improving the f(0)F(2) predictions for the sunrise transition period. The algorithm uses an average hourly gradient obtained from the previous four days f(0)F(2) observations and the 'present' f(0)F(2), to predict f(0)F(2) for the next hour. A further improvement was achieved by adding a second order correction term to the averaged slope. The second order correction takes into account (1) the change in 'now' f(0)F(2) with respect to the previous four days' average f(0)F(2) and (2) the increasing/decreasing gradient of f(0)F(2). In the algorithm the sign of the second order term is selected so as to set a converging trend for the correction term. The algorithm is applied to a 24-hour period by dividing the time interval in two sections (04-16 and 16-04 LT) and reversing the sign of the second order correction for these two intervals, to assure the use of the converging trend from the algorithm for the 24 hour cycle. The scheme reduces the standard error in prediction from 0.9 MHz using the lONCAP method to 0.4 MHz at high solar activity and from 0.5 MHz using IONCAP to 0.9 MHz at low solar activity. The algorithm proposed here improves the f(0)F(2) prediction by 50% at high solar activity and by 40% at low solar activity. The method provides a minimum of 25% improvement in the real time prediction of f(0)F(2) for 80% of the time. This level of reduction in the error of prediction of f(0)F(2) is useful to the OTH radar frequency management, becuse every 6% change in 'M' (ratio of radar frequency to f(0)F(2) at midpoint of the radar range) requires an adjustment of the radar operation frequency.
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Total Pages | : 78 |
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Genre | : Environmental geology |
ISBN | : |
Download Environmental Research Papers Book in PDF, ePub and Kindle
Author | : B. S. Dandekar |
Publisher | : |
Total Pages | : 68 |
Release | : 1986 |
Genre | : Ionospheric forecasting |
ISBN | : |
Download Improving FoF2 Prediction for the Sunrise Transition Period Book in PDF, ePub and Kindle
During the 2- to 3-hr sunrise transition period, the relative change in foF2 is 20-60 percent per hour and is independent of solar activity. The change is largest in winter and smallest in summer. To prevent the skip distance from changing by more than 250 km, that is, to maintain continuous illumination of at least 50 percent of the barrier (nominal width 500 km), requires that the operating frequency be changed for every 6 percent change in foF2. Thus, in the case of an OTH system, the operating frequency has to be adjusted during the sunrise period every 6 to 20 min (seasonal dependence) for satisfactory performance. To accommodate such rapid changes, an empirical algorithm has been tested for improved foF2 predictions during sunrise. The prediction scheme is based on the availability of relevant (under the oblique raypath) real time ionospheric data.
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Total Pages | : 788 |
Release | : 1981 |
Genre | : Aeronautics |
ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Author | : B. S. Dandekar |
Publisher | : |
Total Pages | : 70 |
Release | : 1994 |
Genre | : Ionosphere |
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Download Assessment of the AN/FPS 118 Ionospheric Model and Proposed Improvements Book in PDF, ePub and Kindle
Author | : |
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Total Pages | : 716 |
Release | : 1996 |
Genre | : Science |
ISBN | : |
Download Government Reports Announcements & Index Book in PDF, ePub and Kindle
Author | : B. S. Dandekar |
Publisher | : |
Total Pages | : 110 |
Release | : 1996 |
Genre | : Ionospheric radio wave propagation |
ISBN | : |
Download The AN/FPS-118 OTH Radar Book in PDF, ePub and Kindle
Author | : David Lyttleton Cooke |
Publisher | : |
Total Pages | : 104 |
Release | : 1994 |
Genre | : Space plasmas |
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Download Pre-flight POLAR Code Predictions for the CHAWS Space Flight Experiment Book in PDF, ePub and Kindle
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Total Pages | : 506 |
Release | : 1996 |
Genre | : Astrophysics |
ISBN | : |
Download Meteorological and Geoastrophysical Abstracts Book in PDF, ePub and Kindle