Aircraft Upgrade: Sentinel R Mk 1

Overview - In order to maintain the Sentinel R Mk1 aircraft in its fleet, the Ministry of Defense (UK) together with the Raytheon Group (UK) have signed a contract for IRP (Improved Radar Programme). The IRP is an upgrade which helps to merge the receiver and the processor while providing saving on size, weight as well as power.
from: http://ezinearticles.com/?Aircraft-Upgrade:-Sentinel-R-Mk-1&id=9792261