Description of the radar set, tactical-technical characteristics
Figure 1: single transmitting radiator for LOTHAR-FATT radar
|frequency:||7 … 28 MHz
|pulse repetition time (PRT):|
|pulse repetition frequency (PRF):|
|instrumented range:||2 000 NM|
(≙ 3 700 km)
|hits per scan:|
LOTHAR-FATT (Low probability of intercept Over The Horizon Adaptive Radar - Feasibility ATTempt) is an experimental OTH- Backscatter radar operating in the HF-Band. It covers all of Turkey, almost the entire Arabian Peninsula, Northern Africa and the Red Sea from its quasi-monostatic site in Italy.
The 50 broadband λ/4 transmit antennas are distributed in 3 concentric circles in the terrain like a so-called hastily distributed array radar system. The field of transmitting antennas can operate as a phased array antenna. Additionally, each transmitter can use a different waveform so that the entire antenna array operates as a software-defined MIMO radar. Thus, there is no common antenna pattern. The sounding signals of the individual transmit antennas cannot be detected in the space of interest because they are smaller than the ambient noise floor. The echo signal can only be correlated with the waveforms of the individual sounding signals because each of the waveforms is known to the radar signal processor.
The antenna array for receiving consists of 300 active antenna elements.
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