Passive radar has advantages such as anti-interference, good concealment, and low cost, etc. Compared to other passive radar system configurations, the passive radar technology that utilizes the target-borne illuminator of oppor-tunity (IO) has stronger reflection signals due to the closer distance between the target and the IO, making it easier to achieve target detection. So far, the passive ISAR imaging using target borne IO has been extended to 3D InISAR imaging. However, when InISAR imaging operates in squint-looking mode, the obtained 3D images will be distorted and accurate 3D reconstruction results cannot be obtained. To solve this problem, a passive InISAR 3D imaging method that is suitable for squint-looking mode is proposed. Coordinate transformation and nonlinear least squares (NLS) are used to estimate the target’s 3D coordinate information in the imaging coordinate system from the distance information of the 2D ISAR image and the interferometric phases that both contain the target’s 3D coordinate infor-mation. Afterwards, coordinate transformation is performed again to obtain the 3D coordinate information of the target in the target body coordinate system, achieving 3D reconstruction of the target without squint-looking distortion. The effectiveness of the proposed passive squint InISAR 3D imaging method is verified through simulation experiments, which can achieve correction of squint-looking distortion.
[1]万显荣, 易建新, 占伟杰, 等.基于多照射源的被动雷达研究进展与发展趋势[J].雷达学报, 2020, 9(06):939-958
[2]WAN X R, YI J X, ZHAN W J, et al.Research pro-gress and development trend of the multi-illuminator-based passive radar[J].Journal of Radars, 2020, 9(6):939-958
[3]SAINI R, CHERNIAKOV M.DTV signal ambiguity function analysis for radar application[J].IEE Proceed-ings-Radar, Sonar and Navigation, 2005, 152(3):133-142
[4]POULLIN D.Passive detection using digital broad-casters (DAB,DVB) with COFDM modulation[J].IEE Proceedings-Radar, Sonar and Navigation, 2005, 152(3):143-152
[5]THOMAS J M, GRIFFITHS H D, BAKER C J.Am-biguity function analysis of digital radio mondiale sig-nals for HF passive bistatic radar[J].Electronics Let-ters, 2006, 42(25):1482-1483
[6]COLEMAN C, YARDLEY H.Passive bistatic radar based on target illuminations by digital audio broad-casting[J].IET Radar, Sonar & Navigation, 2008, 2(5):366-375
[7]TAN D K P, SUN H, Lu Y, et al.Passive radar using global system for mobile communication signal: theory,implementation and measurements[J].IEE Proceed-ings-Radar, Sonar and Navigation, 2005, 152(3):116-123
[8]ZEMMARI R, DAUN M, and NICKEL U.Maritime surveillance using GSM passive radar[C]. The 13th In-ternational Radar Symposium (IRS), Warsaw, Poland, 2012: 76–82.
[9]GUO H, WOODBRIDGE K, BAKER C J.Evaluation of WiFi beacon transmissions for wireless based pas-sive radar[C]. 2008 IEEE Radar Conference. IEEE, 2008: 1-6.
[10]COLONE F, FALCONE P, LOMBARDO P, et al.Am-biguity function side-lobes reduction in WiFi-based Passive bistatic radar[C]. Presentation at the Annual GTTI Meeting. 2009.
[11]COLONE F, FALCONE P, BONGIOANNI C, et al.Wi Fi-based passive bistatic radar: Data processing schemes and experimental results[J].IEEE Transac-tions on Aerospace and Electronic Systems, 2012, 48(2):1061-1079
[12]PISCIOTTANO I, CRISTALLINI D, PASTINA D.Maritime target imaging via simultaneous DVB‐T and DVB‐S passive ISAR[J].IET Radar, Sonar & Navigation, 2019, 13(9):1479-1487
[13]PISCIOTTANO I, SANTI F, PASTINA D, et al.DVB-S based passive polarimetric ISAR—Methods and ex-perimental validation[J].IEEE sensors journal, 2020, 21(5):6056-6070
[14]MA H, ANTONIOU M, CHERNIAKOV M.Passive GNSS-Based SAR Resolution Improvement Using Joint Galileo E5 Signals[J].IEEE Geoscience & Re-mote Sensing Letters, 2015, 12(8):1640-1644
[15]MA H, ANTONIOU M, STOVE A G, et al.Maritime moving target localization using passive GNSS-Based multistatic radar[J].IEEE Transactions on Geoscience and Remote Sensing, 2018, 56(8):4808-4819
[16]SANTI F, PIERALICE F, and PASTINA D.Joint de-tection and localization of vessels at sea with a GNSS-based multistatic radar[J].IEEE Transactions on Geo-science and Remote Sensing, 2019, 57(8):5894-5913
[17]PASTINA D, SANTI F, PIERALICE F, et al.Passive radar imaging of ship targets with GNSS signals of op-portunity[J].IEEE Transactions on Geoscience and Remote Sensing, 2020, 59(3):2627-2642
[18]NAKAMURA S, SUWA K, MORITA S, et al.An experimental study of enhancement of the cross-range resolution of ISAR imaging using ISDB-T digital TV based passive bistatic radar[C]. 2011 IEEE Internation-al Geoscience and Remote Sensing Symposium. IEEE, 2011: 2837-2840.
[19]WANG Y, BAO Q, WANG D, et al.An experimental study of passive bistatic radar using uncooperative ra-dar as a transmitter[J].IEEE Geoscience and remote sensing letters, 2015, 12(9):1868-1872
[20]JIE S, FU-QING C, CAI-SHENG Z, et al.Experi-mental results of maritime moving target detection based on passive bistatic radar using non‐cooperative radar illuminators[J].The Journal of Engineering, 2019, 2019(20):6763-6766
[21]MARTORELLA M, GIUSTI E, NEL W.Passive ISAR using target-borne illuminators of opportunity[C]. In-ternational Conference on Radar Systems (Radar 2017). IET, 2017: 1-5.
[22]GIUSTI E, MARTORELLA M.Passive 3D interfero-metric ISAR using target‐borne illuminator of oppor-tunity[J].IET Radar, Sonar & Navigation, 2019, 13(2):190-197
[23]LI L, LIU H, JIU B, et al.An interferometric inverse synthetic aperture radar imaging algorithms for squint model[J].Journal of Xi’an Jiaotong University, 2008, 42(10):1290-1294
[24]LIU C L, HE F, GAO X Z, et al.Squint-mode InISAR imaging based on nonlinear least square and coordi-nates transform[J].Science China Technological Sciences, 2011, 54:3332-3340
[25]GONG R, WANG L, ZHU D.A novel approach for squint InISAR imaging with dual-antenna configura-tion[J].Digital Signal Processing, 2022, 127:103592-
[26]CHEN V C, MARTORELLA M.逆合成孔径雷达成像[M]. 胡明春, 孙俊, 译. 北京: 国防工业出版社, 2020: 43-47.
[27]CHEN V C, MARTORELLA M.Inverse synthetic ap-erture radar[M]. HU C M, SUN J, translated. Beijing: National Defence Industry Press, 2020: 43-47 (in Chi-nese).
[28]PETRI D, MOSCARDINI C, MARTORELLA M, et al.Performance analysis of the batches algorithm for range-Doppler map formation in passive bistatic ra-dar[J]. 2012.
[29]MARTORELLA M, STAGLIANO D, SALVETTI F, et al.D interferometric ISAR imaging of noncooperative targets[J].IEEE Transactions on Aerospace and Elec-tronic Systems, 2014, 50(4):3102-3114
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