scholarly journals The EISCAT meteor-head method – a review and recent observations

2004 ◽  
Vol 4 (3) ◽  
pp. 649-655 ◽  
Author(s):  
A. Pellinen-Wannberg
Keyword(s):  
Signal Processing ◽  
High Resolution ◽  
Data Storage ◽  
Side Lobe ◽  
Current View ◽  
Dual Frequency ◽  
Head Echo ◽  
Barker Codes ◽  
Random Codes ◽  
Very High

Abstract. Since the very first meteor observations at EISCAT in December 1990, the experimental method has improved significantly. This is due to a better understanding of the phenomenon and a recent major upgrade of the EISCAT signal processing and data storage capabilities. Now the simultaneous spatial-time resolution is under 100 m-ms class. To illuminate the meteor target for as long as possible and simultaneously get as good altitude resolution as possible, various coding techniques have been used, such as Barker codes and random codes with extremely low side lobe effects. This paper presents some background and the current view of the meteor head echo process at EISCAT as well as the observations which support this view, such as altitude distributions, dual-frequency target sizes and vector velocities. It also presents some preliminary results from recent very high resolution tristatic observations.

scholarly journals The EISCAT meteor-head method – a review and recent observations

2004 ◽  
Vol 4 (1) ◽  
pp. 21-38 ◽  
Author(s):  
A. Pellinen-Wannberg
Keyword(s):  
Signal Processing ◽  
High Resolution ◽  
Data Storage ◽  
Side Lobe ◽  
Current View ◽  
Dual Frequency ◽  
Head Echo ◽  
Barker Codes ◽  
Random Codes ◽  
Very High

Abstract. Since the very first meteor observations at EISCAT in December 1990, the experimental method has improved significantly. This is due to a better understanding of the phenomenon and a recent major upgrade of the EISCAT signal processing and data storage capabilities. Now the simultaneous spatial-time resolution is under 100 m-ms class. To illuminate the meteor target for as long as possible and simultaneously get as good altitude resolution as possible, various coding techniques have been used, such as alternating Barker codes, Barker codes and random codes with extremely low side lobe effects. This paper presents some background and the current view of the meteor head echo process at EISCAT as well as the observations which support this view, such as altitude distributions, dual-frequency target sizes and vector velocities. It also presents some preliminary results from recent very high resolution tristatic observations.

scholarly journals Meteor head echoes - observations and models

2005 ◽  
Vol 23 (1) ◽  
pp. 201-205 ◽  
Author(s):  
A. Pellinen-Wannberg
Keyword(s):  
Signal Processing ◽  
Data Storage ◽  
Time Resolution ◽  
High Power ◽  
Dual Frequency ◽  
Incoherent Scatter ◽  
Large Aperture ◽  
Comprehensive Theory ◽  
Incoherent Scatter Radars ◽  
Head Echo

Abstract. Meteor head echoes - instantaneous echoes moving with the velocities of the meteors - have been recorded since 1947. Despite many attempts, this phenomenon did not receive a comprehensive theory for over 4 decades. The High Power and Large Aperture (HPLA) features, combined with present signal processing and data storage capabilities of incoherent scatter radars, may give an explanation for the old riddle. The meteoroid passage through the radar beam can be followed with simultaneous spatial-time resolution of about 100m-ms class. The current views of the meteor head echo process will be presented and discussed. These will be related to various EISCAT observations, such as dual-frequency target sizes, altitude distributions and vector velocities.

scholarly journals Very-High-Resolution Airborne Synthetic Aperture Radar Imaging: Signal Processing and Applications

2013 ◽  
Vol 101 (3) ◽  
pp. 759-783 ◽  
Author(s):  
Andreas Reigber ◽  
Rolf Scheiber ◽  
Marc Jager ◽  
Pau Prats-Iraola ◽  
Irena Hajnsek ◽  
...  
Keyword(s):  
Signal Processing ◽  
High Resolution ◽  
Synthetic Aperture Radar ◽  
Radar Imaging ◽  
Synthetic Aperture ◽  
Very High ◽  
Aperture Radar

Airborne SAR-Efficient Signal Processing for Very High Resolution

2013 ◽  
Vol 101 (3) ◽  
pp. 784-797 ◽  
Author(s):  
Hubert M. J. Cantalloube ◽  
Carole E. Nahum
Keyword(s):  
Signal Processing ◽  
High Resolution ◽  
Airborne Sar ◽  
Very High

SIGNAL-PROCESSING BASED ACQUISITION OF VERY HIGH RESOLUTION IMAGES USING MULTIPLE CAMERAS

1992 ◽  
pp. 1773-1776
Author(s):  
Takahiro SAITO ◽  
Touru IGARASHI ◽  
Takashi KOMATSU ◽  
Kiyoharu Aizawa
Keyword(s):  
Signal Processing ◽  
High Resolution ◽  
Multiple Cameras ◽  
High Resolution Images ◽  
Very High

Very High Resolution Analysis of the Dynamics of a Coronal Plasmoid

1994 ◽  
Vol 144 ◽  
pp. 593-596
Author(s):  
O. Bouchard ◽  
S. Koutchmy ◽  
L. November ◽  
J.-C. Vial ◽  
J. B. Zirker
Keyword(s):  
High Resolution ◽  
Solar Eclipse ◽  
Total Solar Eclipse ◽  
Field Of View ◽  
Small Field ◽  
High Resolution Analysis ◽  
Ccd Observations ◽  
Resolution Analysis ◽  
Very High ◽  
Small Field Of View

AbstractWe present the results of the analysis of a movie taken over a small field of view in the intermediate corona at a spatial resolution of 0.5“, a temporal resolution of 1 s and a spectral passband of 7 nm. These CCD observations were made at the prime focus of the 3.6 m aperture CFHT telescope during the 1991 total solar eclipse.

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