LPI considerations for surveillance radars

Reducing the vulnerability of surveillance radars to detection by third party intercept receivers is one of the major objectives of modern military radar design. The requirement for a low probability of intercept (LPI) radar is `~ to see and not be seen´. The task is essentially twofold; the radar must be designed to meet its specified detection performance with minimum radiated power and to measure the target characteristics with a waveform modulation that is difficult for an intercept receiver to identify