L型阵列结构及信号模型的建构与仿真

Construction and Simulation of the Signal Model Based on L Array

通过信号处理技术实现空间入射信号参数估计是雷达阵列信号处理的基本问题。然而目前阵列信号处理在工程实践中仍存在诸多困难,如阵列结构复杂,冗余度大,由此付出的巨大运算量及存储量都不利于实际运用。该文围绕以上问题,研究和建构了L型阵列,并基于此阵列,针对远场窄带信号,利用时延数据,以时间变元作为旋转因子,构造信号模型,实现ESPR IT技术,达到同时估计信号频率和二维到达角的目的。该算法避免了平面阵的复杂性,同时频率和方向可以实现自动配对。在仿真实验结果中亦可看出,各参数仿真结果接近真实值,同时,运算量大大减少,更加便于实际应用。

In array signal processing, the estimation of the signal parameters is very important. However, there are lots of difficulties in the real time application of the array signal processing, such as large amount of the operations and memories because of the complex structure of the plane array. Based on all these problems, here, some new improvements are described and with a constructed L array, a method based on the rotational invariance techniques（ESPRIT） for calculating the frequency and the two - dimensional arrival angle of the signal source is presented. The frequencies and the angles can be paired automatically, and the structure is much simpler than that of the plane array. The simulation results are perfect, and clearly, the operation amount is relatively smaller, so it will be more practical and feasible.