雷达目标角闪烁抑制

Suppression of Angle Scintillation of Radar Target

在ｎ个无源短偶极子串列模型的基础上给出了目标二元短偶极子简化模型，并利用求雷达线性调频的宽带频率均方根和目标回波相位波前孔径面场均方根的方法，分析了抑制目标角闪烁的有效途径和方法．最后给出了计算机的仿真结果．

In China's research and development of precision radar tracking system, it has become urgent to solve the problem of suppression of angle scintillation. Computer simulation shows that the research results presented in this paper appear to be promising for meeting this urgent nced.The well-known n-element series model, consisting of a series of passive short dipoles, appears to the author to be too complicated. So the author proposes a simplified two-element-short-dipole model of target.The author uses this simplified model to anlyze the scintillation behavior of echo of radar target.Then the author studies how to reduce angle scintillation of target with the utilization of integration of frequency domain and field integration of space wave.Eq.(10) is an important relationship derived by the author on the basis of the simplified model. From eq.(10) the follwing suggcestion may be made:(1) In the design of radar system, when suppression is to be achieved, the designer should select chirp or frequency diversity system.(2) When △f/ f<< 1, it is bighly beneficial to suppression to select a relatively large value of △f(△fisbandwidth of frequency modulation radar).(3) Provided that the requirements of radar system structure are satisfied, the field intogration of space wave of radar echo should be increased by increasing D, the diameter of aperture of radar antenna.At the cud of the paper a numerical example is given. The author takes D=15 cm, △f=515.464 MHz.r=200m.Then the author performs computer simulation and uses eq.(13) to compute e (average disalignment of angle scintillation of target). For this particular numerical example, simulation results show that e can be reduced by 15.24 dB with the suggested measures of this paper.