Saturday 8 June 2013

HF radar

For the past few days I've been in Peru, testing a new low cost low power HF radar developed using software defined radio and a new type of a radar transmission and analysis method. The idea is to use this system to study the structure of ionospheric waves.

The radar consists of one transmit dipole antenna, located ~600 meters from two receiver dipoles used for interferometry and polarization determination. The radar operates at 3.66 MHz with a mere 20 W of transmit power.

The first results are pretty encouraging, as we can see up to 20 hops between the Earth and the ionosphere, as well as meteors, and even aircraft.

The colors indicate Doppler velocity and intensity. Green is low Doppler shift, red means that the target is going away, and blue indicates that the target is coming down. The colors are mixed together, and their intensities indicate return power in a dB scale. 

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