The new CAS-DIS digital ionosonde

• Main Authors: Wang Shun, Chen Ziwei, Zhang Feng, Fang Guangyou
• Format: Article
• Language: English
• Published: Istituto Nazionale di Geofisica e Vulcanologia (INGV) 2013-04-01
• Series: Annals of Geophysics
• Subjects: Ionosonde; Coherent integration; Pulse compression; Digital down-conversion; Narrowband tracking filter
• Online Access: http://www.annalsofgeophysics.eu/index.php/annals/article/view/6203

<p>A high quality digital ionosonde called the Chinese Academy of Sciences digital ionosonde (CAS-DIS) has been developed for investigations of the ionosphere. Two important features are used for the CAS-DIS; first, the technique of analog down-conversion has been replaced by the new approach of digital down-conversion technology. Secondly, to solve the problem of large instantaneous receiving bandwidth in digital receivers, an analog narrowband tracking filter is used for the CAS-DIS. The center frequency of the filter tracks the carrier frequency transmitted in real-time, to ensure that the frequency components are filtered out of the effective bandwidth. This report describes the system architecture of the CAS-DIS, its main features, and its test results for ionosphere detection.</p><p class="keywords"> </p>