北京航空航天大学学报 ›› 2018, Vol. 44 ›› Issue (12): 2489-2495.doi: 10.13700/j.bh.1001-5965.2018.0172

• 信息与电子技术 • 上一篇    下一篇

采用矢量调制器实时消除模拟相关偏置

辛灿伟, 胡岸勇, 刘凯, 苗俊刚   

  1. 北京航空航天大学 电子信息工程学院, 北京 100083
  • 收稿日期:2018-03-29 修回日期:2018-08-23 出版日期:2018-12-20 发布日期:2018-12-28
  • 通讯作者: 胡岸勇 E-mail:hay800906@126.com
  • 作者简介:辛灿伟,男,博士研究生。主要研究方向:毫米波辐射计灵敏度提高技术;胡岸勇,男,博士,讲师。主要研究方向:微波遥感技术、毫米波系统、信号与信息处理;刘凯,男,博士研究生。主要研究方向:毫米波辐射计近场校准与成像;苗俊刚,男,博士,教授,博士生导师。主要研究方向:微波遥感理论与技术、毫米波亚毫米波技术。
  • 基金资助:
    国家重点研发计划(2016YFC0800401);国家自然科学基金(61731001)

Real-time elimination of analog correlator offset using vector modulator

XIN Canwei, HU Anyong, LIU Kai, MIAO Jungang   

  1. School of Electronic and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China
  • Received:2018-03-29 Revised:2018-08-23 Online:2018-12-20 Published:2018-12-28
  • Supported by:
    National Key R&D Program of China (2016YFC0800401); National Natural Science Foundation of China (61731001)

摘要: 在采用模拟复相关器的综合孔径辐射计中,模拟复相关器会受到很多因素(环境温度、信号串扰等)的影响而引入随时间变化的相关偏置。引入的相关偏置对高灵敏度室内综合孔径辐射计的影响很大,实时消除相关偏置是综合孔径辐射计设计中的关键点和难点。提出了一种采用矢量调制器实时消除模拟相关偏置的算法。通过算法推导和论证,在现有综合孔径辐射计中进行了验证,很好地解决了相关偏置问题,相关偏置的残余误差可以达到5%以内,校消的速度受限于积分时间,本文可以达到毫秒量级。本文算法简单易实现,也可广泛应用于其他需要实时消除此类干扰的系统中。

关键词: 综合孔径辐射计, 矢量调制器, 模拟复相关器, 复相关偏置, 毫米波成像

Abstract: The analog complex correlator used in aperture synthesis radiometers is easy to be affected by many complicated factors, for example ambient temperature, signal crosstalk and so on. These factors result in correlator offset value change with time, which will significantly impact the performance of aperture synthesis radiometers. Real-time elimination of the effect of complex correlator offset value is the difficult and key point in the design of aperture synthesis radiometers. In this paper, a calibration method using vector modulator is proposed to eliminate in real time the effect of complex correlator offset value. Through algorithm derivation and argumentation, the proposed method is verified in the existing aperture synthesis radiometers, and the results show that it perfectly eliminates the effect of correlator offset value. Residual offset value is less than 5%,and calibration time is limited to the integration time of complex correlator, which is mentioned in this paper is at a millisecond level. The real-time calibration method proposed in this paper is efficient and easy to implement, which can be widely used in the systems where this kind of interference needs to be eliminated.

Key words: aperture synthesis radiometers, vector modulator, analog complex correlator, complex correlator offset, millimeter wave imaging

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