二维阵列超视距雷达的选频方法

该文提出一种通过预测到达任务区域路径信噪比，自适应地为天波超视距雷达选择工作频点的方法。利用2维阵列的俯仰维分辨能力，克服了传统方法无法从返回散射电离图中分离多模/多径信号的缺陷。雷达通过电离层探测设备和2维接收阵列，获取返回散射数据、环境干扰数据和电离层状态数据。然后利用电离层模型和状态数据，推算各频点对任务区域的照射路径。运用2维自适应波束形成抑制环境干扰噪声，并处理返回散射数据以预测各路径回波强度。最后计算各频点路径在脉冲压缩后的信噪比，选择信噪比最大值的频率为最优工作频点。

Operating Frequency Selection for Sky-wave Over-the-horizon Radar with 2-D Array

This paper presents a method of adaptive operating frequency selection for sky-wave Over-The-Horizon Radar (OTHR) with 2-D array by predicting Signal-to-Noise Ratio (SNR) of paths to the area of interest. With the elevation resolution of 2-D array, this method overcomes the incapability of separating multipath/multimode signals for OTHR with 1-D array. For frequency selecting, firstly, sounding equipments and 2-D array record the backscattering data, environment data and ionosphere state data. Propagation paths to the area of interest are deduced for available frequencies based on the ionosphere model and state. 2-D adaptive digital beam forming is employed to suppress interferences and predict the power of echoes. Finally, the paths SNR is calculated and the frequency of the maximum SNR is selected as the optimal operating frequency.