Efficient coding and resonance spike identification for topside ionogram processing
This paper describes an effective coding method to eliminate the redundancy contained in digital ionograms and an algorithm to identify the resonance spikes appearing on topside ionograms. This work is a first step toward automatic profile reduction to obtain ionospheric electron density profiles. T...
| Main Authors: | , , , , , |
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| Format: | Report |
| Language: | English |
| Published: |
Radio Research Laboratories/Radio Research Laboratories/Radio Research Laboratories/Radio Research Laboratories/Radio Research Laboratories/National Institute of Polar Research
1982
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| Subjects: | |
| Online Access: | https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1265 http://id.nii.ac.jp/1291/00001265/ https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1265&item_no=1&attribute_id=18&file_no=1 |
| Summary: | This paper describes an effective coding method to eliminate the redundancy contained in digital ionograms and an algorithm to identify the resonance spikes appearing on topside ionograms. This work is a first step toward automatic profile reduction to obtain ionospheric electron density profiles. Topside sounder data recorded by ISIS-2 satellite are digitized and converted to digital ionograms. A quantitative comparison of data compression techniques, based on the run-length and predictive coding method, is made and leads the conclusion that the modified run-length coding method is most effective and useful from the practical view point. This simulation experiment results in self-consistent determination of characteristic frequencies with good accuracy except for the ionograms with obscure resonance spikes. |
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