基于DBF技术的相位干涉仪及性能研究

Phase interferometer and its performances based on DBF

针对相位干涉仪无法同时分辨多目标且易受到干扰导致测向失败的问题,提出数字波束形成(DBF)与相位干涉相结合的DBF相位干涉仪。DBF相位干涉仪采用数字阵列作为干涉仪子阵,给出了系统模型,证明了接收的信号经过DBF处理后不会破坏子阵间信号的相位差。给出了针对DBF相位干涉仪的两种解模糊方法:波束形成法和空间谱估计法,理论分析表明了DBF相位干涉仪具有高自由度和多目标分辨能力,克服了常规干涉仪抗干扰能力较弱的问题,提高了信噪比,且仅采用较少的基线即可达到较高的测角精度。仿真结果表明了上述理论分析的正确性。

A novel phase interferometer named DBF phase interferometer using digital beamforming technology is presented for the issue of direction finding failure due to phase interferometer poor anti-jamming ability. The DBF phase interferometer model which uses a digital array as the antenna element is introduced, and the correctness of phase difference between two elements signal after DBF processing is proved. Two algo- rithms which base on DBF and spatial spectrum are given. The performances of DBF phase interferometer are discussed. It shows that DBF phase interferometer has high degree of freedom and SNR, can distinguish between multiple radiation sources, and overcome the problem of phase interferometer poor anti-jamming ability. Moreover, this interferometer can achieve high angular accuracy just using less baselines. Simulations verify the correctness of the theoretical analysis.