CAJ | 학술논문

　　传统相控阵天线系统为实现多波束，在重量、体积、功耗等方面会有明显的增加，系统的基本可靠性也显著降低。基于软件无线电思想，利用超外差结构实现宽带信号变频，并对瞬时带宽内的信号同时进行模/数或数/模变换，再根据串口提供的每个波束方位、俯仰和频率等信息，在基带实现数字多波束形成。设计了一套S频段、瞬时宽带100 MHz的数字多波束相控阵天线系统。测试结果表明，该天线可收发同时形成3个独立波束，每个波束在俯仰面0°～70°、方位面全向的扫描范围内实现EIRP值不小于40 dBm，G/T值不小于-20 dB/K的优良指标。该设计可以有效提高系统灵活性，降低系统的复杂度。
　　전통상공진천선계통위실현다파속，재중량、체적、공모등방면회유명현적증가，계통적기본가고성야현저강저。기우연건무선전사상，이용초외차결구실현관대신호변빈，병대순시대관내적신호동시진행모/수혹수/모변환，재근거천구제공적매개파속방위、부앙화빈솔등신식，재기대실현수자다파속형성。설계료일투S빈단、순시관대100 MHz적수자다파속상공진천선계통。측시결과표명，해천선가수발동시형성3개독립파속，매개파속재부앙면0°～70°、방위면전향적소묘범위내실현EIRP치불소우40 dBm，G/T치불소우-20 dB/K적우량지표。해설계가이유효제고계통령활성，강저계통적복잡도。
With the increasing numbers of beamforming,the weight,size,power consumption of traditional digi-tal multi-beam phased array antennas may increase significantly,and the system′s basic reliability will decrease significantly. Based on software radio theory,a new method is presented. Superheterodyne is used to realize wideband signal frequency changing,and A/D or D/A converter of signals is realized in instantaneous band-width simultaneously.According to the azimuth angle,pitch angle and frequence supported by series port,the multi-beam is formed in the baseband. An S-band digital multi-beam phased array antenna with 100 MHz in-stantaneous bandwidth is designed. The experimental results show that the T/R antennas can form three inde-pendent beams simultaneously. In the azimuthal omnidirectional scanning range of pitch angle 0°~70°,the EIRP is not less than 40 dBm,and G/T is not less than -20 dB/K. The design can retrench a lot of hardware devices,and reduce the complexity of the system.