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LOTHAR-FATT
Ray-tracing output (white lines) and electron density profile (colour map). It is worth noting that for a fixed frequency by decreasing the elevation angle.
Ray-tracing output (white lines) and electron density profile (colour map). It is worth noting that: greater distances are reached for a fixed elevation angle by increasing the transmitted frequency.
Example of 3D electron density profile carried out by means of a network of ionosondes. The profile is updated whenever the network of ionosondes records new values
Receiving antenna array: 3D receiving element
Receiving antenna array: 3D close look of the receiving antenna array geometry
Transmitting antenna array: prototype scaled model (1:4) of the transmitting element
Transmitting antenna array: 3D representation of the transmitting antenna array
High-level architecture of the LOTHAR system (TX radar site in pink colour, RX radar site in blue colour)
Example of the ssurveillance area (blue area) which can be illuminated by the LOTHAR system
HF OTH sky-wave radar principle: the transmitted HF signal is reflected by the ionospheric layers and illuminates targets over the horizon. As a matter of fact the e.m. waves at the aforementioned frequencies are gradually bended through the ionosphere thus extending the coverage of the radar well beyond the line of sight (LoS).
