数字阵列宽带多波束发射设计与验证

Testbed for Digital Arrays Assisted Broadband Multi-Beam Transmission

  • 摘要: 现有相控阵干扰设备通常采用分孔径或者分时隙方式实现多目标干扰,但前者无法利用全孔径增益,后者在目标数较多时存在干扰资源时域分配紧张的问题。针对这些问题,提出整数倍和分数倍延时分阶可调的方法,整数倍延时通过采样间隔延时,分数倍延时采用Farrow滤波器,实现了大带宽数字发射的目的。此外还对关键延时特性进行了仿真,并构建了小规模数字阵列样机。实验结果表明,该样机瞬时带宽为400 MHz,能够同时发射4波束,干扰方向和功率任意可调,延时特性与仿真结果一致。

     

    Abstract: The existing phased array equipment usually adopts sub-aperture or sub-timeslot to realize multi-target jamming, but the former cannot take advantage of full aperture gain, and the latter cannot allocate the time-domain resource smoothly when the number of targets is large. In order to solve this problem, this paper proposes a method to adjust the integer and fractional delays in order to realize the purpose of large bandwidth digital transmission. The integer delay is realized by sampling interval delay, and the fractional delay is realized by Farrow filter. The key delay characteristics are simulated, and the minimum scale digital array prototype is constructed. The test results show that the simultaneous four beams with the instantaneous bandwidth of 400 MHz are realized, the direction and power of jamming beam can be adjusted arbitrarily, and the delay characteristics are also consistent with the simulation results.

     

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