Free Content The multi-frequency sodar with high temporal resolution

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Abstract:

The new sodar LATAN-3M with a frequency-coded sounding signal was developed, manufactured, and successfully tested at the Obukhov Institute for Atmospheric Physics. The sodar emits a sequence of sounding pulses at different frequencies and then averages the Doppler spectra for each range gate over the ensemble of frequencies. The field tests have proved the significant advantages of a multi-frequency technique in comparison with a single-frequency one. The use of eight different frequencies halves the minimal acceptable signal to noise ratio compared to single-frequency sounding. Moreover, the multi-frequency mode improves the accuracy of instantaneous values of measured parameters and significantly increases the reliability in recognizing noisy echo-signals.

German
Das neue Sodar LATAN-3M mit einem frequenz-codierten Tonsignal wurde am Obukhov Institut für Atmosphärische Physik entwickelt, gebaut und erfolgreich getestet. Das Sodar sendet eine Sequenz von Tonimpulsen auf unterschiedlichen Frequenzen und mittelt das Dopplerspektrum für jedes Intervall über die Frequenzen. Während der Feldversuche wurden die signifikanten Vorteile der Multifrequenztechnik gegenüber der Monofrequenztechnik nachgewiesen. Verglichen mit dem monofrequenten Signal reicht beim Einsatz acht unterschiedlicher Frequenzen ein halb so lautes Signal als Mindestanforderung aus. Ferner steigert der Multifrequenzmodus die Genauigkeit der Messwerte und verbessert signifikant die Zuverlässigkeit beim Erkennen von Echosignalen bei Stöorgeräuschen.

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0941-2948/2009/0373

Publication date: April 1, 2009

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  • Meteorologische Zeitschrift (originally founded in 1866) is the joint periodical of the meteorological societies of Austria, Germany and Switzerland. It accepts high-quality peer-reviewed manuscripts on all aspects of observational, theoretical and computational research out of the entire field of meteorology, including climatology. Meteorologische Zeitschrift represents a natural forum for the meteorological community of Central Europe and worldwide.
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