CAJ | 학술논문

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。
해문제출일충통과예측도체임무구역로경신조비，자괄응지위천파초시거뢰체선택공작빈점적방법。이용2유진렬적부앙유분변능력，극복료전통방법무법종반회산사전리도중분리다모/다경신호적결함。뢰체통과전리층탐측설비화2유접수진렬，획취반회산사수거、배경간우수거화전리층상태수거。연후이용전리층모형화상태수거，추산각빈점대임무구역적조사로경。운용2유자괄응파속형성억제배경간우조성，병처리반회산사수거이예측각로경회파강도。최후계산각빈점로경재맥충압축후적신조비，선택신조비최대치적빈솔위최우공작빈점。
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.