The EISCAT meteor code
The EISCAT UHF system has the unique capability to determine meteor vector velocities from the head echo Doppler shifts measured at the three sites. Since even meteors spending a very short time in the common volume produce analysable events, the technique lends itself ideally to mapping the orbits...
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ftdoajarticles:oai:doaj.org/article:a6b9093a4da542f1b3e28d400bb80e6a 2023-05-15T16:04:35+02:00 The EISCAT meteor code G. Wannberg A. Westman J. Kero C. Szasz A. Pellinen-Wannberg 2008-08-01T00:00:00Z https://doi.org/10.5194/angeo-26-2303-2008 https://doaj.org/article/a6b9093a4da542f1b3e28d400bb80e6a EN eng Copernicus Publications https://www.ann-geophys.net/26/2303/2008/angeo-26-2303-2008.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-26-2303-2008 0992-7689 1432-0576 https://doaj.org/article/a6b9093a4da542f1b3e28d400bb80e6a Annales Geophysicae, Vol 26, Pp 2303-2309 (2008) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2008 ftdoajarticles https://doi.org/10.5194/angeo-26-2303-2008 2022-12-31T15:00:12Z The EISCAT UHF system has the unique capability to determine meteor vector velocities from the head echo Doppler shifts measured at the three sites. Since even meteors spending a very short time in the common volume produce analysable events, the technique lends itself ideally to mapping the orbits of meteors arriving from arbitrary directions over most of the upper hemisphere. A radar mode optimised for this application was developed in 2001/2002. A specially selected low-sidelobe 32-bit pseudo-random binary sequence is used to binary phase shift key (BPSK) the transmitted carrier. The baud-length is 2.4 μs and the receiver bandwidth is 1.6 MHz to accommodate both the resulting modulation bandwidth and the target Doppler shift. Sampling is at 0.6 μs, corresponding to 90-m range resolution. Target range and Doppler velocity are extracted from the raw data in a multi-step matched-filter procedure. For strong (SNR>5) events the Doppler velocity standard deviation is 100–150 m/s. The effective range resolution is about 30 m, allowing very accurate time-of-flight velocity estimates. On average, Doppler and time-of-flight (TOF) velocities agree to within about one part in 10 3 . Two or more targets simultaneously present in the beam can be resolved down to a range separation <300 m as long as their Doppler shifts differ by more than a few km/s. Article in Journal/Newspaper EISCAT Directory of Open Access Journals: DOAJ Articles Annales Geophysicae 26 8 2303 2309 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 G. Wannberg A. Westman J. Kero C. Szasz A. Pellinen-Wannberg The EISCAT meteor code |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
The EISCAT UHF system has the unique capability to determine meteor vector velocities from the head echo Doppler shifts measured at the three sites. Since even meteors spending a very short time in the common volume produce analysable events, the technique lends itself ideally to mapping the orbits of meteors arriving from arbitrary directions over most of the upper hemisphere. A radar mode optimised for this application was developed in 2001/2002. A specially selected low-sidelobe 32-bit pseudo-random binary sequence is used to binary phase shift key (BPSK) the transmitted carrier. The baud-length is 2.4 μs and the receiver bandwidth is 1.6 MHz to accommodate both the resulting modulation bandwidth and the target Doppler shift. Sampling is at 0.6 μs, corresponding to 90-m range resolution. Target range and Doppler velocity are extracted from the raw data in a multi-step matched-filter procedure. For strong (SNR>5) events the Doppler velocity standard deviation is 100–150 m/s. The effective range resolution is about 30 m, allowing very accurate time-of-flight velocity estimates. On average, Doppler and time-of-flight (TOF) velocities agree to within about one part in 10 3 . Two or more targets simultaneously present in the beam can be resolved down to a range separation <300 m as long as their Doppler shifts differ by more than a few km/s. |
format |
Article in Journal/Newspaper |
author |
G. Wannberg A. Westman J. Kero C. Szasz A. Pellinen-Wannberg |
author_facet |
G. Wannberg A. Westman J. Kero C. Szasz A. Pellinen-Wannberg |
author_sort |
G. Wannberg |
title |
The EISCAT meteor code |
title_short |
The EISCAT meteor code |
title_full |
The EISCAT meteor code |
title_fullStr |
The EISCAT meteor code |
title_full_unstemmed |
The EISCAT meteor code |
title_sort |
eiscat meteor code |
publisher |
Copernicus Publications |
publishDate |
2008 |
url |
https://doi.org/10.5194/angeo-26-2303-2008 https://doaj.org/article/a6b9093a4da542f1b3e28d400bb80e6a |
genre |
EISCAT |
genre_facet |
EISCAT |
op_source |
Annales Geophysicae, Vol 26, Pp 2303-2309 (2008) |
op_relation |
https://www.ann-geophys.net/26/2303/2008/angeo-26-2303-2008.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-26-2303-2008 0992-7689 1432-0576 https://doaj.org/article/a6b9093a4da542f1b3e28d400bb80e6a |
op_doi |
https://doi.org/10.5194/angeo-26-2303-2008 |
container_title |
Annales Geophysicae |
container_volume |
26 |
container_issue |
8 |
container_start_page |
2303 |
op_container_end_page |
2309 |
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1766400175567273984 |