一种基于旋转测量的阵列幅相误差校正新方法

程丰; 龚子平; 张驰; 万显荣

doi:10.11999/JEIT161058

一种基于旋转测量的阵列幅相误差校正新方法

doi: 10.11999/JEIT161058

基金项目:

CEMEE国家重点实验室主任基金(CEMEE2014 Z0101B)，国家自然科学基金(U1333106, 61331012, 61371197)，国家重点研发计划(2016YFB0502403)

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- 文章访问数: 1341
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- 被引次数: 0
出版历程
- 收稿日期: 2016-10-12
- 修回日期: 2017-04-24
- 刊出日期: 2017-08-19

A New Rotation Measurement-based Method for Array Gain-phase Errors Calibration

Funds:

The Director Foundation of The State Key Laboratory of CEMEE (CEMEE2014Z0101B), The National Natural Science Foundation of China (U1333106, 61331012, 61371197), The National Key RD Plan (2016YFB0502403)

摘要

摘要: 校正源信号方向角不容易精确测量，限制了阵列有源校正方法的精度。另一方面，无源校正方法难以应用于存在大阵列误差的场合，其实际应用也受到严重限制。该文提出一种基于旋转测量的阵列幅相误差校正新方法，无需测量校正源信号方向角就能获得较高的校正精度。该方法利用已知的阵列旋转角度，基于最大似然准则获得阵列幅相误差、校正源信号方向角及其复振幅的无模糊估计。相对于校正源信号方向角，阵列旋转角度通过专用测试转台更容易精确测量，因此该方法能以较小的代价获得很高的校正精度。仿真实验验证了该方法的有效性和通用性。
- 阵列校正 /
- 幅相误差 /
- 校正精度 /
- 旋转测量 /
- 测试转台
Abstract: It is not easy to accurately measure the direction angles of calibration-source signals, which limits the precision of array active-calibration methods. On the other hand, passive-calibration methods are difficult to apply to the presence of large array errors, which severely limits their practical applications. This paper proposes a rotation measurement-based method to calibrate array gain-phase errors, which can achieve high calibration precision without measuring the direction angles of calibration-source signals. Using the known array-rotation angles, the maximum likelihood-based method is able to simultaneously estimate the array gain-phase errors, direction angles and complex amplitudes of calibration-source signals without ambiguity. Compared with accurately measuring the direction angles of calibration-source signals, accurately measuring the array-rotation angles is much easier to be accomplished with a special test turntable, thus the proposed method can achieve quite high calibration precision at a low cost. Some simulation tests demonstrate the effectiveness and generality of the proposed method.
- Array calibration /
- Gain-phase errors /
- Calibration precision /
- Rotation measurement /
- Test turntable

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