太赫兹科学与电子信息学报, 2016, 14 (4): 562, 网络出版: 2016-10-24  

通道幅相误差对数字阵列天线性能影响及校准

Effect of channel amplitude/phase errors on digital array performance and calibration
作者单位
南京电子技术研究所, 江苏 南京 210039
摘要
为实现低副瓣数字阵列天线性能,需要对阵面通道幅相误差进行校准。针对此问题,定性分析了通道幅相误差、阵面通道数与数字阵列天线主要性能 (副瓣电平、波束指向、增益 )的相对关系,分析结果表明: 通道间幅相误差越大,副瓣电平、波束指向、增益越差; 通道数越多,副瓣电平、波束指向受通道误差影响越小,而增益受通道幅相误差的影响与阵面通道数无关。结合数字阵雷达实际使用中阵面通道幅相误差修调问题,重点研究了通道误差测量方法。给出了利用内监测法和中场测量法进行通道误差测量的原理、实现方法及适用条件,该 2种通道误差测量方法可以作为互补手段使用。最后,给出了一种基于多次测量取平均值的数字阵列幅相误差校准方法,仿真结果表明: 校准前后,通道幅相误差分别由 2 dB和 20°变为 0.4 dB和 2°,满足指标要求。
Abstract
The calibration of channel amplitude/phase errors is necessarily required in order to achieve the performance of low side-lobe digital array. The relationships among channel amplitude/phase errors, array channels and the main performance (side-lobe level, beam direction, gain) of digital array are analyzed. Analysis results show that, the side-lobe, gain and beam direction would deteriorate as the amplitude/phase errors increase; the influence degree of amplitude/phase errors on the side-lobe level and beam direction would decrease as the number of the array channels increase; the influence of amplitude/phase errors on gain is independent on the number of the array channels. According to the adjustment problem of channel amplitude/phase errors in digital array application, as a complementary method of measuring the channel amplitude/phase errors, the principle, implementation methods and application conditions of internal-monitor and mid-field measurement are studied in detail. A calibration method of channel amplitude/phase errors is put forward. Simulation results show that after calibration, the channel amplitude/phase errors decrease from 2 dB and 20° to 0.4dB and 2°respectively,which meets the expected specification.

唐晓雷, 张令坤, 陈飞. 通道幅相误差对数字阵列天线性能影响及校准[J]. 太赫兹科学与电子信息学报, 2016, 14(4): 562. TANG Xiaolei, ZHANG Lingkun, CHEN Fei. Effect of channel amplitude/phase errors on digital array performance and calibration[J]. Journal of terahertz science and electronic information technology, 2016, 14(4): 562.

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