摘要
在低仰角跟踪过程中,空域飞行目标发射的电磁波可通过不同路径传播到达相控阵系统接收端;由于各分量场的到达时间不同,它们按各自相位相互叠加而造成干扰,导致相控阵天线无法通过传统单脉冲测角技术准确获得目标的角度信息;为了消除多径效应对于系统低角跟踪性能的影响,提出了一种改进单脉冲测角技术方法:该方法利用相邻脉冲差波束相位跳变构造对称波束,并采用频率分集技术,通过对不同工作频率下得到的和差波束进行一系列运算,能够准确得到目标与镜像目标的角度信息;在典型二径环境下,测角误差由之前的一度左右降低到零点一度以下;改进单脉冲测角技术的应用使得系统的跟踪性能明显提高,并且计算复杂度较低,较容易实现,因此具有良好的工程实用价值。
In the process of low elevation tracking,the electromagnetic waves emitted by the flying target can propagate through different paths to reach the receiving end of the phased array system.Due to the different arrival times of the component fields,they superimpose on each other in their respective phases and cause interference,resulting in the phased array antenna being unable to accurately obtain the angular information of the target through the traditional single-pulse angle measurement technique.In order to eliminate the influence of multipath effect on the low elevation tracking performance of the system,an improved single-pulse angle measurement technique is proposed in this paper.The method utilizes the phase jump of adjacent pulse difference beams to construct a symmetrical beam and adopts frequency diversity technology.A series of operations on the sum-difference beams obtained at different operating frequencies have been performed to accurately obtain the angular information of the target and the mirror target,and the angular error of the single-pulse system in a specific environment has been reduced from the previous about 1 degree to less than 0.1 degree.The application of improved single-pulse goniometry allows the tracking performance of the system in a multipath environment to be significantly improved,and the lower computational complexity makes it easier to implement and therefore of good engineering utility.
作者
王安飞
郭肃丽
WANG Anfei;GUO Suli(The 54th Research Institute of China Electronics Technology Corporation,Shijiazhuang 050081,China)
出处
《计算机测量与控制》
2023年第2期290-297,共8页
Computer Measurement &Control
关键词
低仰角跟踪
相控阵系统
改进单脉冲
对称波束
频率分集技术
low angle tracking
phased array systems
improved single pulse
symmetrical beam
frequency diversity technology
