CAJ | 학술논문

当干扰与目标方位夹角较小时，基于单圆阵的方位全向米波雷达在进行干扰对消时，目标回波的对消损失较大，从而降低了干扰对消后的目标检测概率和目标方位估计精度。针对此问题，该文提出一种基于双圆阵的干扰对消和目标方位角估计算法。该算法先利用小圆阵激励出的-1,0和1阶相位模式初步估计干扰的方位角，后利用大圆阵激励出对称高阶相位模式获得精确的干扰方位角并利用其激励出的非对称高阶相位模式进行干扰对消和目标方位角的估计。该算法相对于单圆阵的干扰对消和测角方法可以减小目标回波的对消损失，提高干扰对消后的信噪比，从而增大目标检测概率和提高目标方位角的估计精度，仿真结果证明了该算法的有效性。
당간우여목표방위협각교소시，기우단원진적방위전향미파뢰체재진행간우대소시，목표회파적대소손실교대，종이강저료간우대소후적목표검측개솔화목표방위고계정도。침대차문제，해문제출일충기우쌍원진적간우대소화목표방위각고계산법。해산법선이용소원진격려출적-1,0화1계상위모식초보고계간우적방위각，후이용대원진격려출대칭고계상위모식획득정학적간우방위각병이용기격려출적비대칭고계상위모식진행간우대소화목표방위각적고계。해산법상대우단원진적간우대소화측각방법가이감소목표회파적대소손실，제고간우대소후적신조비，종이증대목표검측개솔화제고목표방위각적고계정도，방진결과증명료해산법적유효성。
If the azimuth angle between the interference and the detected target is small, the energy of the received signal reflected by the target may have a great loss when the interference is cancelled for an omni-directional VHF radar with single circular array. To resolve this problem, an improved algorithm based on double circular arrays is proposed. The algorithm firstly utilizes the excited phase mode-1, 0 and 1 of the small array to estimate a rough azimuth angle of the interference, and then acquires an accurate one by symmetrical phase modes of high orders of the large array. Finally, interference cancellation and estimation of target’s azimuth angle are fulfilled via unsymmetrical phase modes of the large array. Compared with the algorithm based on single array, the proposed algorithm can reduce the energy loss of the useful signal and increase the estimation precision of target’s azimuth angle. Simulation results demonstrate the effectiveness of the proposed algorithm.