THE NEW INGV DIGITAL IONOSONDE: DESIGN REPORT

Istituto Nazionale di Geofisica e Vulcanologia

The ionosonde is a system which exploits the radar technique: it applies electromagnetic waves with variable frequency in the HF band to measure the ionospheric layers electron density, height and other parameters. This paper is a technical report on the new digital ionosonde (AIS-INGV), which was designed both for research purposes and for the routine service of the HF radiowave propagation forecast. It has been developed almost completely within the Laboratorio di Geofisica Ambientale (LGA) at the Istituto Nazionale di Geofisica e Vulcanologia (INGV). It exploits advanced techniques for the signal analysis, recent technological devices and PC resources. The report is divided into two parts; the first is a general description of the design development, the second is a more detailed description of the blocks and circuits actually built and tested, directed to a specialist reader.

Appleton E.V. and Barnett M.A.F., Local reflection of wireless wave from from the upper atmosphere, Nature 25 333-334 (1925).

Breit G. and Tuve M.A., A test of the existence of a conducting layer, Phys. Rev., vol. 28 pp. 554-575 (1926).

Bianchi C., Note sulle Interazioni delle Onde Elettromagnetiche con il Plasma Ionosferico, Monografia N. 2 dell'Istituto Nazionale di Geofisica (Luglio 1990).

Bibl K., Evolution of the ionosonde, Annali di Geofisica Vol. 41 N.5-6 (1998).

C.C.I.R., World distribution and characteristics of atmospheric radio noise, Int. Radio Consultative Comm.,
International Telecommunication Union, Geneva, Switzerland, Rep 322 (1964).

Davies K., Ionospheric Radio, P. Peregrinus London (1990).

Hunsucker R.D., Radio technique for probing the terrestrial ionosphere, Springer-Verlag N.Y. (1991).

Krauss J.D. – Antennas- Mc Graw Hill N.Y. (1988).

Marconi S.G., Radio Telegraphy, Proc. IRE vol 21 N.4 p.237 (1922).

Monti P., Tecniche Radar Navali, Calderini Bologna (1981).

Oppenheim A.V., Ronald W. Schafer, Discrete time signal processing, Prendice Hall Inc. New Jersey (1999).

Reinisch B.W., New Techniques in ground- based ionospheric sounding and studies. Radio Sciences Vol 21
(1986).

Skolnik M.I. Introduction to radar systems, Mc Graw-Hill N.Y. (1980).

Skolnik M.I. Radar handbook, Mc Graw Hill N.Y. (1997).