孙慧峰1,,
禹卫东1,
①.中国科学院电子学研究所 ??北京 ??100190
②.中国科学院大学 ??北京 ??100049
基金项目:国家部委基金
详细信息
作者简介:王沛:王 ? 沛(1977–),男,陕西省西安市人,副研究员,硕士生导师。2005年在中国科学院大学获得通信与信息系统硕士学位,现为中国科学院电子学研究所副研究员。参与和负责我国多个重点星载、机载SAR工程型号项目的研制。主要研究方向为宽带信号产生技术、射频系统技术及SAR系统设计。E-mail: vanpei@163.com
孙慧峰(1979–),男,中国科学院电子学研究所副研究员,硕士生导师。研究方向为星载合成孔径雷达天线技术。E-mail: sunemt@163.com
禹卫东(1969–),男,中国科学院电子学研究所研究员,博士生导师。研究方向为合成孔径雷达信号处理技术。E-mail: ywd@mail.ie.ac.cn
通讯作者:王沛 ? vanpei@163.com
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出版历程
收稿日期:2018-01-19
修回日期:2018-06-11
A Novel Wireless Internal Calibration Method of Spaceborne SAR
Wang Pei1,2,,,Sun Huifeng1,,
Yu Weidong1,
①. Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, China
②. University of Chinese Academy of Sciences, Beijing 100049, China
Funds:The National Ministries Foundation
摘要
摘要:内定标利用雷达系统内部设备和定标通路来测量系统各部分幅度和相位在成像过程中的相对变化,是保证雷达图像辐射精度的重要手段。该文针对传统有线内定标方案定标通路未覆盖相控阵天线TR输出端至无源阵面路径、定标网络庞大且自身误差控制难等不足,提出了一种新颖的利用辅助天线的无线内定标方法,给出了定标原理和分析模型,推导了SAR天线TR通道幅相特性和系统传递函数的标定方法,并在典型星载SAR系统参数下对标定误差进行了仿真分析,仿真结果表明,辅助天线支撑杆位置引起的TR通道幅度标定误差在10–3 dB量级,可以忽略;引起相位标定误差与支撑杆位置偏差密切相关,可依据文中给出的仿真曲线得到。支持杆位置引起的系统传递函数幅度标定误差小于0.1 dB;引起的相位标定误差对支撑杆位置偏差不敏感。最后在实际相控阵天线上对无线内定标方法进行了验证,获取了TR通道幅相特性标定的实测结果,表明了该方案的可行性和有效性。
关键词:合成孔径雷达/
内定标/
无线传输/
幅相误差/
传递函数
Abstract:Internal calibration measures the changes in amplitude and phase of a system during imaging via the calibration loop built in Synthetic Aperture Radar (SAR). Internal calibration is also an important factor to improve the radiation accuracy of the radar. In this study, a novel wireless internal calibration method with auxiliary antenna is presented, considering that the traditional scheme is inefficient, as the calibration loop cannot cover the path from the TR (Transmitter-Receiver) output to the antenna radiator. The calibration loop also results in a complicated and heavy network. The principle and model of the new method is given, and the TR performance and system transfer function calibration approach are deduced. In addition, error analysis is conducted. The simulation results show that TR amplitude calibration errors caused by the rod of auxiliary antenna are at a 10–3 dB level, and phase calibration errors are obtained from the simulation curve in the paper; transfer function amplitude calibration errors are less than 0.1 dB, and phase calibration errors are not sensitive to the bias of the rod. Finally, the simulation results based on typical parameters of spaceborne SAR and the individual TR calibration experiments confirm the availability and feasibility of this novel method.
Key words:Synthetic Aperture Radar (SAR)/
Internal calibration/
Wireless transmission/
Amplitude and phase error/
Transfer function
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