Phase-coded pulse aperiodic transmitter coding
Both ionospheric and weather radar communities have already adopted the method of transmitting radar pulses in an aperiodic manner when measuring moderately overspread targets. Among the users of the ionospheric radars, this method is called Aperiodic Transmitter Coding (ATC), whereas the weather ra...
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ftdoajarticles:oai:doaj.org/article:82eb02e2ddf9413193e137fb3364a90f 2023-05-15T16:04:37+02:00 Phase-coded pulse aperiodic transmitter coding I. I. Virtanen J. Vierinen M. S. Lehtinen 2009-07-01T00:00:00Z https://doi.org/10.5194/angeo-27-2799-2009 https://doaj.org/article/82eb02e2ddf9413193e137fb3364a90f EN eng Copernicus Publications https://www.ann-geophys.net/27/2799/2009/angeo-27-2799-2009.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-27-2799-2009 0992-7689 1432-0576 https://doaj.org/article/82eb02e2ddf9413193e137fb3364a90f Annales Geophysicae, Vol 27, Pp 2799-2811 (2009) Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 article 2009 ftdoajarticles https://doi.org/10.5194/angeo-27-2799-2009 2022-12-30T23:17:58Z Both ionospheric and weather radar communities have already adopted the method of transmitting radar pulses in an aperiodic manner when measuring moderately overspread targets. Among the users of the ionospheric radars, this method is called Aperiodic Transmitter Coding (ATC), whereas the weather radar users have adopted the term Simultaneous Multiple Pulse-Repetition Frequency (SMPRF). When probing the ionosphere at the carrier frequencies of the EISCAT Incoherent Scatter Radar facilities, the range extent of the detectable target is typically of the order of one thousand kilometers – about seven milliseconds – whereas the characteristic correlation time of the scattered signal varies from a few milliseconds in the D-region to only tens of microseconds in the F-region. If one is interested in estimating the scattering autocorrelation function (ACF) at time lags shorter than the F-region correlation time, the D-region must be considered as a moderately overspread target, whereas the F-region is a severely overspread one. Given the technical restrictions of the radar hardware, a combination of ATC and phase-coded long pulses is advantageous for this kind of target. We evaluate such an experiment under infinitely low signal-to-noise ratio (SNR) conditions using lag profile inversion. In addition, a qualitative evaluation under high-SNR conditions is performed by analysing simulated data. The results show that an acceptable estimation accuracy and a very good lag resolution in the D-region can be achieved with a pulse length long enough for simultaneous E- and F-region measurements with a reasonable lag extent. The new experiment design is tested with the EISCAT Tromsø VHF (224 MHz) radar. An example of a full D/E/F-region ACF from the test run is shown at the end of the paper. Article in Journal/Newspaper EISCAT Tromsø Directory of Open Access Journals: DOAJ Articles Tromsø Annales Geophysicae 27 7 2799 2811 |
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Directory of Open Access Journals: DOAJ Articles |
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English |
topic |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 I. I. Virtanen J. Vierinen M. S. Lehtinen Phase-coded pulse aperiodic transmitter coding |
topic_facet |
Science Q Physics QC1-999 Geophysics. Cosmic physics QC801-809 |
description |
Both ionospheric and weather radar communities have already adopted the method of transmitting radar pulses in an aperiodic manner when measuring moderately overspread targets. Among the users of the ionospheric radars, this method is called Aperiodic Transmitter Coding (ATC), whereas the weather radar users have adopted the term Simultaneous Multiple Pulse-Repetition Frequency (SMPRF). When probing the ionosphere at the carrier frequencies of the EISCAT Incoherent Scatter Radar facilities, the range extent of the detectable target is typically of the order of one thousand kilometers – about seven milliseconds – whereas the characteristic correlation time of the scattered signal varies from a few milliseconds in the D-region to only tens of microseconds in the F-region. If one is interested in estimating the scattering autocorrelation function (ACF) at time lags shorter than the F-region correlation time, the D-region must be considered as a moderately overspread target, whereas the F-region is a severely overspread one. Given the technical restrictions of the radar hardware, a combination of ATC and phase-coded long pulses is advantageous for this kind of target. We evaluate such an experiment under infinitely low signal-to-noise ratio (SNR) conditions using lag profile inversion. In addition, a qualitative evaluation under high-SNR conditions is performed by analysing simulated data. The results show that an acceptable estimation accuracy and a very good lag resolution in the D-region can be achieved with a pulse length long enough for simultaneous E- and F-region measurements with a reasonable lag extent. The new experiment design is tested with the EISCAT Tromsø VHF (224 MHz) radar. An example of a full D/E/F-region ACF from the test run is shown at the end of the paper. |
format |
Article in Journal/Newspaper |
author |
I. I. Virtanen J. Vierinen M. S. Lehtinen |
author_facet |
I. I. Virtanen J. Vierinen M. S. Lehtinen |
author_sort |
I. I. Virtanen |
title |
Phase-coded pulse aperiodic transmitter coding |
title_short |
Phase-coded pulse aperiodic transmitter coding |
title_full |
Phase-coded pulse aperiodic transmitter coding |
title_fullStr |
Phase-coded pulse aperiodic transmitter coding |
title_full_unstemmed |
Phase-coded pulse aperiodic transmitter coding |
title_sort |
phase-coded pulse aperiodic transmitter coding |
publisher |
Copernicus Publications |
publishDate |
2009 |
url |
https://doi.org/10.5194/angeo-27-2799-2009 https://doaj.org/article/82eb02e2ddf9413193e137fb3364a90f |
geographic |
Tromsø |
geographic_facet |
Tromsø |
genre |
EISCAT Tromsø |
genre_facet |
EISCAT Tromsø |
op_source |
Annales Geophysicae, Vol 27, Pp 2799-2811 (2009) |
op_relation |
https://www.ann-geophys.net/27/2799/2009/angeo-27-2799-2009.pdf https://doaj.org/toc/0992-7689 https://doaj.org/toc/1432-0576 doi:10.5194/angeo-27-2799-2009 0992-7689 1432-0576 https://doaj.org/article/82eb02e2ddf9413193e137fb3364a90f |
op_doi |
https://doi.org/10.5194/angeo-27-2799-2009 |
container_title |
Annales Geophysicae |
container_volume |
27 |
container_issue |
7 |
container_start_page |
2799 |
op_container_end_page |
2811 |
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1766400231796113408 |