| Autor: |
Ayliffe, Jim K., Durbridge, Lyndon J., Frazer, Gordon J., Gardiner‐Garden, Robert S., Heitmann, Andrew J., Praschifka, Justin, Quinn, Adrian D., Scarman, Gavin C., Turley, Mike D. E. |
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| Zdroj: |
Radio Science; Jan2019, Vol. 54 Issue 1, p104-114, 11p |
| Abstrakt: |
Defence Science and Technology Group has developed a complete oblique incidence ionosonde system to enhance ionospheric monitoring capabilities in support of the Jindalee Operational Radar Network. The Digital Oblique Receiving System, and its counterpart, the Digital Oblique Transmitting System, feature a direct‐digital, multichannel chirp‐sounder design that allows flexible collection of high‐resolution ionograms across many simultaneous paths, without compromising dynamic range. This paper outlines the hardware and software components of the Digital Oblique Receiving System/Digital Oblique Transmitting System, including the onboard signal processing that removes radio frequency interference and fits a parameterized electron density profile to the ionogram. Additional control and data management tools that have enabled the system to be effectively transitioned into routine operations are also described. The typical performance is illustrated through a selection of sample ionograms, highlighting the applications of Digital Oblique Receiving System/Digital Oblique Transmitting System to a wide variety of ionospheric studies, including those requiring Doppler and angle‐of‐arrival observations. Plain Language Summary: An oblique incidence ionospheric sounder (or ionosonde) records the ionospheric propagation characteristics for high‐frequency radio waves on one‐way over‐the‐horizon paths of up to 3,000 km or more. Observations are typically presented in the form of an ionogram image, a record of the received signal power (or path loss) as a function of frequency and delay. Defence Science and Technology Group has recently developed both transmitting and receiving subsystems that enable high‐quality ionograms to be produced simultaneously on multiple paths. The sophisticated hardware and software components that underpin this system are described in this paper, and a selection of sample ionograms illustrates the typical performance and applications to ionospheric studies. Key Points: Defence Science and Technology Group has developed a direct‐digital ionosonde for oblique incidence observations of the ionosphereA suite of onboard software supports flexible command and control, sophisticated signal and image processing, and data management toolsThe output ionograms and automatically scaled parameters are of high quality, and are now used routinely in regional ionospheric models [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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