Events in Eastern Ukraine have clearly demonstrated the vulnerability of weapon location radars in presence of hostile means for persistent aerial surveillance and electronic warfare. Weapon location radars are active sensors, making them easy to be localized and attacked/jammed.
This all fuels the need to redefine effective approaches in counter battery, in particular for the functions usually fulfilled by weapon location radars: target acquisition, fire control and prediction of impacts.
The capability requirement is for 24/7 persistent surveillance with (preferably) passive sensors; acoustic vector sensors offer a solution. With mobility being essential for survivability on the battlefield, rapidly redeployable, or even truly mobile capabilities are required.