JORN is also interesting 
<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Jindalee_Operational_Radar_Network" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Jindalee_Operational_Radar_Net...</a>