A comparison of methods for randomizing phase quantization errors in phased arrays
A comparison of methods for randomizing phase quantization errors in phased arrays
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DOI：
10.1109/tap.1983.1143152
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发表时间：
1983-11
影响因子：
5.7
通讯作者：
M. Smith;Y. Guo
中科院分区：
文献类型：
--
作者：
M. Smith;Y. Guo
相控阵的波束控制通常采用电子可切换数字移相器。这些只能近似于整个阵列的期望相位分布，并且如果使用直接舍入，则出现周期性相位误差，这导致主波束的指向偏差并引入寄生旁瓣。在文献中已经给出了用于随机化相位误差以减少这些问题的各种方法。本文推导了不同方法下寄生旁瓣电平的一般计算公式。参考1）寄生旁瓣电平，2）场方向图和指向方向的方差，3）增益降低，以及4）任何额外的阵列硬件要求和波束控制单元资源，对各种方法进行比较。
Beamsteering for phased arrays normally employs electronically switchable digital phase shifters. These can only approximate to the desired phase distribution across the array, and if a straightforward rounding off is used, a periodic phase error arises which causes a pointing deviation of the main beam and introduces a parasitic sidelobe. Various methods have been given in the literature for randomizing the phase errors to reduce these problems. Here a general formula is derived to evaluate the parasitic sidelobe level for different methods. The various methods are compared with reference to 1) the parasitic sidelobe level, 2) the variances of the field pattern and the pointing direction, 3) gain reduction, and 4) any extra array hardware requirements and beamsteering unit resources.