SAR激励信号正交调制幅相不平衡预失真校正方法*

doi:10.7523/j.ucas.2022.079

摘要/Abstract

摘要： 模拟正交调制技术是合成孔径雷达（SAR）宽带激励信号产生中最常用也是最重要的技术手段之一,随着雷达系统瞬时带宽越来越大,模拟正交调制的IQ一致性特性并不能完全依靠器件的对称特性来保证,而IQ不平衡在宽带雷达发射系统中带来的杂散失真会随着链路逐级恶化。针对上述情况,本文提出了一种数字预失真补偿方法,通过对整个发射通道进行系统误差建模并搭建测试系统,能够提取包含正交调制IQ不平衡在内的整个发射链路上的所有幅相误差,并将幅相误差映射到数字基带信号输出的IQ支路上,通过数字预失真的方式补偿发射通道的幅相失真,使得输出的雷达激励信号具有接近理想的幅相特性。最后结合实际的雷达发射系统,利用预失真算法对整个发射链路进行失真校正,给出了校正前后的测试对比结果,通过测试表明方法的有效性。

关键词: 合成孔径雷达, 正交调制, 宽带, IQ不平衡, 幅相误差

Abstract: Analog I/Q modulation technology is one of the most commonly used and important technical means in broadband SAR exciter design. With the increasing instantaneous bandwidth of radar system, the amplitude-phase consistency of analog I/Q modulation can not be guaranteed completely by the symmetrical characteristics of devices, and the spurious distortion caused by the IQ imbalance in broadband radar transmission system will deteriorate step by step. The paper proposes a digital predistortion method which can extract all amplitude-phase errors on the whole transmission channel mainly including IQ imbalance by modeling the system error and building a test system, map the amplitude-phase errors to the IQ branch of digital baseband signal output, and compensate the amplitude-phase distortion of the transmission channel. Finally, combined with the actual radar transmitting system, the distortion of the whole transmitting link is corrected by using the predistortion method. The test results before and after correction are given and the test shows the effectiveness of the method.

Key words: SAR, I/Q modulation, Wideband, IQ imbalance, amplitude-phase errors

中图分类号:

TN958

贾颖新, 王岩飞. SAR激励信号正交调制幅相不平衡预失真校正方法^*[J]. 中国科学院大学学报, DOI: 10.7523/j.ucas.2022.079.

JIA Yingxin, WANG Yanfei. A predistortion correction method for quadrature modulation amplitude and phase imbalance of SAR excitation signal[J]. Journal of University of Chinese Academy of Sciences, DOI: 10.7523/j.ucas.2022.079.

参考文献

[1] Brenner A R, Essen H, Stilla U. Representation of stationary vehicles in ultra-high resolution SAR and turntable ISAR images[C]//EUSAR2012; 9th European Conference on Synthetic Aperture Radar. Nuremberg, Germany. VDE, : 147-150.
[2] El-Arnauti G, Saalmann O, Brenner A R.Ultra-high resolution airborne experiments with a new Ka-band SAR sensor[C]//2017 European Radar Conference (EURAD). October 11-13, 2017. Nuremberg, Germany. IEEE, 2017: 409-412. DOI:10.23919/eurad.2017.8249234.
[3] Dupuis X, Martineau P.Very high resolution circular SAR imaging at X band[C]//2014 IEEE Geoscience and Remote Sensing Symposium. Quebec City, QC, Canada. IEEE, : 930-933. DOI:10.1109/IGARSS.2014.6946578.
[4] Mishra S, Singh N, Dhar J, et al.A GaAs based miniaturized C-band double balanced resistive IQ modulator for synthetic aperture radar (SAR) applications[C]//2019 IEEE Recent Advances in Geoscience and Remote Sensing: Technologies, Standards and Applications. Kochi, India. IEEE, : 57-60. DOI:10.1109/TENGARSS48957.2019.8976064.
[5] Yahav N, Efendowicz A.Broadband high linearity IQ modulator for direct conversion transmitters[C]//2016 46th European Microwave Conference (EuMC). London, UK. IEEE, : 1019-1022.
[6] Zhu Z W, Leung H, Huang X P.Challenges in reconfigurable radio transceivers and application of nonlinear signal processing for RF impairment mitigation[J]. IEEE Circuits and Systems Magazine, 2013, 13(1): 44-65. DOI:10.1109/MCAS.2012.2237143.
[7] Luo J, Kortke A, Keusgen W, et al.A novel adaptive calibration scheme for frequency-selective I/Q imbalance in broadband direct-conversion transmitters[J]. IEEE Transactions on Circuits and Systems II: Express Briefs, 2013, 60(2): 61-65. DOI:10.1109/TCSII.2012.2235735.
[8] Khandelwal A, Verma A.A novel gain, phase and offset calibration scheme for wideband direct-conversion transmitters[C]//2015 IEEE 81st Vehicular Technology Conference. Glasgow, UK. IEEE, : 1-5. DOI:10.1109/VTCSpring.2015.7145633.
[9] Fawzy A, Sun S M, Lim T J, et al. Iterative learning control for pre-distortion design in wideband direct-conversion transmitters[C]//GLOBECOM2020 - 2020 IEEE Global Communications Conference. Taipei, China. IEEE, : 1-6. DOI:10.1109/GLOBECOM42002.2020.9322378.
[10] Zhu Z W, Huang X P, Leung H.Joint I/Q mismatch and distortion compensation in direct conversion transmitters[J]. IEEE Transactions on Wireless Communications, 2013, 12(6): 2941-2951. DOI:10.1109/TCOMM.2013.050313.121256.
[11] Zhu Z W, Huang X P, Caron M, et al.Blind self-calibration technique for I/Q imbalances and DC-offsets[J]. IEEE Transactions on Circuits and Systems I: Regular Papers, 2014, 61(6): 1849-1859. DOI:10.1109/TCSI.2013.2290826.
[12] Arriaga-Trejo I A. Estimation of the channel and I/Q imbalances with zero correlation zone sequences and superimposed training[C]//2019 IEEE International Conference on Microwaves, Antennas, Communications and Electronic Systems. Tel-Aviv, Israel. IEEE, : 1-6. DOI:10.1109/COMCAS44984.2019.8958069.
[13] Huang X J, Zhang J A, Guo Y J.Joint transmitter and receiver I/Q imbalance estimation in presence of carrier frequency offset[C]//2015 15th International Symposium on Communications and Information Technologies (ISCIT). Nara, Japan. IEEE, : 209-212. DOI:10.1109/ISCIT.2015.7458344.
[14] 陈雷, 岳光荣, 唐俊林, 等. 基于数字预失真的发射机I/Q不平衡矫正[J]. 电子与信息学报, 2017, 39(4): 847-853. DOI:10.11999/JEIT160581.
[15] 陆必应, 梁甸农. 大时带积线性调频信号源幅相误差分析与校正[J]. 现代雷达, 2004, 26(10): 38-40, 60. DOI:10.16592/j.cnki.1004-7859.2004.10.012.

SAR激励信号正交调制幅相不平衡预失真校正方法^*

A predistortion correction method for quadrature modulation amplitude and phase imbalance of SAR excitation signal

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