相控阵天线零相位误差法的波束指向分析

Analysis for Improving the Beam-Steering Accuracy of Phased Array Antenna by Zero Mean Phase Error Method

受数字移相器量化相位影响,相控阵天线波束指向精度偏离预定指向.提出了零相位误差法用于改进波束指向精度的问题,并推导出零相位误差法提高指向精度的理论公式.计算结果表明,所给出的理论公式是正确和有效的.零相位误差法具有经济适用、便于实现的优点.它在现有硬件的基础上,可以有效地提高相控阵天线的波束指向精度,从而改善相控阵天线抗干扰的能力.在普遍使用的3位数字移相器情况下,波束指向的精度控制在0.012以内,大幅度提高了现有指向精度水平.

In order to solve the problem of pointing deviation of phased arrays caused by the quantization phase of digital phase shifters, this paper proposed zero mean phase error method and investigated how the method affects the arrays' beam-steering accuracy, and an effective formula was developed. The simulation results show the effectiveness and correctness of the formula. The zero mean phase error method is (economical) and easy to realize. It can improve the pointing accuracy of phased arrays based on the given hardware available. And consequently the anti-interference of phased arrays is also improved. In the case of 3 bit digital phase shifter, the pointing accuracy is less than 0.012, which improves the pointing accuracy of phased arrays remarkably.