相控阵雷达受孔径渡越时间影响的研究

在线性调频信号的基础上分析了相控阵雷达工作时孔径渡越时间对其的影响。在时域和频域进行分析,结果表明孔径渡越时间会引起波束偏移和接收信号带内功率降低。根据对波束指向的要求,提出了孔径渡越时间对相对带宽的限制。通过对回波频谱的分析,提出孔径渡越时间会引起频带边缘功率衰减和脉冲压缩后主瓣展宽。根据对功率衰减的要求提出了对雷达带宽的具体约束条件。仿真结果表明,宽带相控阵雷达工作时需要更加严格的约束。

Research of Aperture Fill Time Effect on Phased Array Radar

Aperture fill time effect on phased array radars was analyzed. From the analysis of the time domain and frequency domain, it can be seen that the aperture fill time effect will cause deviation of the beam direction and the attenuation of power. The limit to relative bandwidth was put forward according to the demand from beam direction deviation. The analysis of the frequency spectrum indicated that the aperture fill time would cause power attenuation at the margin of the band width and main lobe broadening after the pulse compressing. Specific constraint was put forward according to the demand of power attenuation. Theoretical analysis indicates that the wideband phased array radar needs stricter constraint to reduce the aperture fill time effect.