Analyzing Radar Meteor Trail Echoes using the Fresnel Transform Technique: A Signal Processing Viewpoint
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Several techniques have been proposed for measuring speeds of meteoroids observed using radars. A recent technique involves the use of Fresnel transforms to accurately determine the speed of a meteoroid producing the trail. We follow a numerical modeling approach to analyze this technique in detail. Our studies indicate that high sensitivity to background noise levels might be a possible shortcoming of the Fresnel transform method. A matched filtering approach is presented as an alternative to alleviate this sensitivity to the noise problem. Performance of the two techniques is compared using numerical modeling and data from a 30 MHz radar.
KeywordsMeteors Meteoroids Radar velocity Fresnel transform Matched filters
The authors would like to thank D. L. Hysell for providing the St. Croix data used in this study. This work was supported by the National Science Foundation through NSF grant no. ITR/AP 04-27029 to The Pennsylvania State University. The authors also wish to thank the reviewers for several useful suggestions.
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