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在卫星导航抗干扰中,传统自适应波束形成算法在干扰方向形成零陷,从而抑制干扰。然而信源与干扰源时域相关、空域相邻时,传统自适应波束形成算法会导致波束畸变,期望信号会被抑制造成检测不理想。通过引入空间相关系数评价,提出了基于平面阵转向的自适应抗干扰技术。通过阵列天线结构优化,优化期望信号与干扰信号的空间相关系数,控制平面阵最佳转向,克服期望信号与干扰信号空域相邻时在固定阵列上相关程度高导致性能严重下降的不足,提高输出信干噪比,增强导航的抗干扰能力。仿真结果表明,平面阵转向技术在阵元数为8的均匀矩形阵情况下,输出信干噪比可提高约7 d B。
Abstract：In the anti-jamming of satellite navigation,traditional beam forming algorithm forms a zero-disturbance in the interference direction to achieve interference suppression. When the signal source and the interference source are related in the time domain and adjacent in the spatial domain,the traditional beam forming algorithm forms a zero-disturbance in the interference direction,so the desired signal will be suppressed,which will cause the distortion of desired signal and create an issue of unsatisfactory detection.By introducing the evaluation of spatial correlation coefficient,an Adaptive Anti-jamming Technique based on planar array steering is proposed.By optimizing the steering of the planar array by optimizing the array antenna structure,the space correlation coefficient of the desired signal and the interference signal is optimized to overcome the shortcoming of serious performance degradation of the array when the desired signal and the interference signal are adjacent to each other.Consequently,the SINR of the output signal is improved so as to improve the anti-jamming capability of the navigation system. Simulation results show that the output signal-to-interference-noise ratio can be increased by about 7 d B for planar array steering technology under the uniform rectangular array with 8 elements.
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基本信息:
中图分类号:TN967.1
引用信息:
[1]项建弘,李高原,许庆帅.基于阵列天线结构优化的自适应抗干扰技术[J].无线电工程,2018,48(08):674-679.
基金信息:
国家自然科学基金资助项目(61371172)
2018-07-17
2018-07-17