数字化相控阵天线的自跟踪系统由于采用数字化跟踪环路,存在因离散化而导致的跟踪误差。针对数字化相控阵天线的自跟踪特性,提出一种利用自跟踪波束对目标跟踪的惯性,并使用内插的方法来提高天线的数字波束的跟踪指向的实时性。实验结果表明,无内插处理时自跟踪离散误差的标准差为0.086 6,而采用内插处理后自跟踪的离散误差的标准差为0.001 735,大大减小了数字跟踪环路在对高动态目标跟踪时由其数字化造成的离散误差。

The self-tracking system of digital phased array antenna has tracking error due to discretization because of the digital tracking loop. Aiming at the characteristics of self-tracking of digital phased antenna, a method is proposed to improve the real-time tracking of digital beam by using the inertia of self-tracking beam and interpolation. The experimental results show that the standard deviation of self-tracking discrete error is 0.086 6 without interpolation, while the standard deviation of self-tracking discrete error is 0.001 735 after interpolation, which reduces the discretization error caused by digital tracking loop when tracking high dynamic target.