Two tracking techniques-Track-While-Scan and Track-and Search are studied from the aspet of basic concepts and the performance prediction in this paper. The similarities and differences of these two techniques in phased array radar and of track-while-scan technique in phased array radar and mechanical scanning radar are compared. The methods to calculate the performance index of the two techniques in phased array radar are proposed
including accuracy
target capacity
utilization rate of rare and reaction time. The performance of the two techniques is compared.