本文研究了在传统的机械扫描雷达和相控阵雷达两种雷达体制中使用边扫描边跟踪技术（ＴＷＳ）跟踪目标时，其扫描方式的不同引起的噪声模型和跟踪性能的差异，并通过在相控阵雷达仿真系统中进行的实验和结果分析，得到了在相控阵雷达中应用ＴＷＳ技术时的跟踪性能不如机械扫描雷达的结论。 This paper studies the difference of the noise model and tracking performance caused by the different scanning modes when using the TWS to track the target in the two kinds of radar systems of traditional mechanical scanning radar and phased array radar. Experiments and results analysis of the phased array radar simulation system show that the tracking performance of the phased array radar is not as good as that of the mechanical scanning radar when using the TWS technology.