Review of millimeter-wave and terahertz near-field synthetic aperture radar imaging technology

Abstract

This paper comprehensively reviews the development of millimeter-wave (MMW) and terahertz (THz) near-field imaging technologies, with an emphasis on the state of synthetic aperture radar (SAR)-based imaging technologies. Near-field imaging technologies are categorized into passive and active imaging modes, among which active imaging is favored because of its strong signal-to-noise ratio and three-dimensional (3D) reconstruction capabilities. This paper discusses SAR-based active imaging systems with various antenna array structures, including planar SISO (Single-Input Single-Output)-SAR, cylindrical SISO-SAR, planar MIMO (Multiple-Input Multiple-Output)-SAR and cylindrical MIMO-SAR. Specifically, the paper emphasizes the advancements in SISO-SAR and MIMO-SAR technologies, highlighting the advantages of MIMO-SAR in improving imaging speed and reducing costs. Finally, the paper provides a summary and outlook on SAR-based MMW and THz near-field imaging technologies.

Keywords

MILLIMETER-wave (MMW) / near-field imaging / synthetic aperture radar (SAR) / terahertz (THz)

References

[1] Yujiri L, Shoucri M, Moffa P. Passive millimeter wave imaging. IEEE Microw Mag. 2003; 4(3): 39-50.

[2] Gabor D. A new microscopic principle. Nature. 1948; 161(4098): 777-778.

[3] Qiu J, Zhuang Z, Kai L, Gaofei L, Fei X. Design and measurement of quasi-optics for millimeter wave imaging system. In: IEEE International Workshop on Imaging Systems and Techniques; 2009: 132-135.

[4] Wang Z, Chang T, Cui H-L. Review of active millimeter wave imaging techniques for personnel security screening. IEEE Access. 2019; 7: 148336-148350.

[5] Farhat NH, Guard WR. Holographic imaging at 70 GHz. Proc IEEE. 1970; 58(12): 1955-1956.

[6] Farhat NH, Guard WR. Millimeter wave holographic imaging of concealed weapons. Proc IEEE. 1971; 59(9): 1383-1384.

[7] Farhat NH. High resolution microwave holography and the imaging of remote moving objects. Opt Eng. 1975; 14(5): 499-505.

[8] Tricoles G, Farhat NH. Microwave holography: applications and techniques. Proc IEEE. 1977; 65(1): 108-121.

[9] Goldsmith PF. Perforated plate lens for millimeter quasi-optical systems. IEEE Trans Antenn Propag. 1991; 39(6): 834-838.

[10] Goldsmith PF, Hsieh CT, Huguenin GR, Kapitzky J, Moore E. Focal plane imaging systems for millimeter wavelengths. IEEE Trans Microw Theor Tech. 1993; 41(10): 1664-1675.

[11] Goldsmith PF. A quasioptical feed system for radioastronomical observations at millimeter wavelengths. Bell System Technical Journal. 1977; 56(8): 1483-1501.

[12] Corredoura P, Baharav Z, Taber B, et al. Millimeter-Wave Imaging System for Personnel Screening: Scanning 10^7 Points a Second and Using No Moving Parts. SPIE; 2006: 68-75.

[13] Sheen DM, McMakin DL, Hall TE. Three-dimensional millimeter-wave imaging for concealed weapon detection. IEEE Trans Microw Theor Tech. 2001; 49(9): 1581-1592.

[14] Li X, Li S, Zhao G, Houjun Sun. Multi-polarized millimeter-wave imaging for concealed weapon detection. In: IEEE International Conference on Microwave and Millimeter Wave Technology (ICMMT). Vol 2; 2016: 892-894.

[15] Naghibi A, Attari AR. Near-field radar-based microwave imaging for breast cancer detection: a study on resolution and image quality. IEEE Trans Antenn Propag. 2021; 69(3): 1670-1680.

[16] Yang X, Zheng YR, Ghasr MT, Donnell KM. Microwave imaging from sparse measurements for near-field synthetic aperture radar. IEEE Trans Instrum Meas. 2017; 66(10): 2680-2692.

[17] Zamani H, Fakharzadeh M. 1.5-D sparse array for millimeter-wave imaging based on compressive sensing techniques. IEEE Trans Antenn Propag. 2018; 66(4): 2008-2015.

[18] Viswanathan N, Venkatesh S, Schurig D. Optimization of a sparse aperture configuration for millimeter-wave computational imaging. IEEE Trans Antenn Propag. 2021; 69(2): 1107-1117.

[19] Wang S, Li S, Hoorfar A, Miao K, Zhao G, Sun H. Compressive sensing-based sparse MIMO array synthesis for wideband near-field millimeter-wave imaging. IEEE Trans Aero Electron Syst. 2023; 59(6): 7681-7697.

[20] Wang S, Li S, Ren B, Miao, K, Zhao, G, Sun, H. Convex optimization-based design of sparse arrays for 3-D near-field imaging[J]. IEEE Sens J, 2023, 23(9): 9640-9648.

[21] Briqech Z, Sebak AR. Millimeter-wave imaging system using a 60 GHz dual-polarized AFTSA-SC probe. In: 2016 33rd National Radio Science Conference (NRSC); 2016: 325-332.

[22] Ren K, Burkholder RJ. A 3-D novel fast back-projection imaging algorithm for stratified media based on near-field monostatic and bistatic SAR. IEEE Trans Antenn Propag. 2021; 69(4): 2326-2335.

[23] Liu C, Zoughi R. Adaptive synthetic aperture radar (SAR) imaging for optimal cross-range resolution and image quality in NDE applications. IEEE Trans Instrum Meas. 2021; 70: 1-7.

[24] Berland F, Fromenteze T, Decroze C, et al. Cylindrical MIMO-SAR imaging and associated 3-D fourier processing. IEEE Open Journal of Antennas and Propagation. 2022; 3: 196-205.

[25] Gao J, Cui Z, Cheng B, et al. Fast three-dimensional image reconstruction of a standoff screening system in the terahertz regime. IEEE Transactions on Terahertz Science and Technology. 2018; 8(1): 38-51.

[26] Gao J, Deng B, Qin Y, et al. An efficient algorithm for MIMO cylindrical millimeter-wave holographic 3-D imaging. IEEE Trans Microw Theor Tech. 2018; 66(11): 5065-5074.

[27] Baccouche B, Agostini P, Mohammadzadeh S, et al. Three-dimensional terahertz imaging with sparse multistatic line arrays. IEEE J Sel Top Quant Electron. 2017; 23(4): 1-11.

[28] Ahmed SS, Schiessl A, Gumbmann F, Tiebout M, Methfessel S, Schmidt LP. Advanced microwave imaging. IEEE Microw Mag. 2012; 13(6): 26-43.

[29] Ahmed SS, Schiessl A, Schmidt LP. A novel active real-time digital-beamforming imager for personnel screening. In: EUSAR 2012; 9th European Conference on Synthetic Aperture Radar; 2012: 178-181.

[30] Tan K, Wu S, Wang Y, Ye S, Chen J, Fang G. A novel two-dimensional sparse MIMO array topology for UWB short-range imaging. IEEE Antenn Wireless Propag Lett. 2016; 15: 702-705.

[31] Sheen DM, McMakin DL, Collins HD, Hall TE, Severtsen RH. Concealed Explosive Detection on Personnel Using a Wideband Holographic millimeter-wave Imaging System. In: Proceeding SPIE - Signal Processing, Sensor Fusion, and Target Recognition V. Vol 2755; 1996: 503-513.

[32] Soumekh M. A system model and inversion for synthetic aperture radar imaging. International Conference on Acoustics, Speech, and Signal Processing. 1990; 4: 1873-1876.

[33] Lopez-Sanchez JM, Fortuny-Guasch J. 3-D radar imaging using range migration techniques. IEEE Trans Antenn Propag. 2000; 48(5): 728-737.

[34] McMakin DL, Hall TE, Sheen DM. Millimeter-wave imaging for concealed weapon detection. Nondestructive Detection and Measurement for Homeland Security. 2003; 5048: 52-62. SPIE.

[35] Sheen DM, Hall TE, McMakin DL. Cylindrical millimeter-wave imaging technique for concealed weapon detection. Selander J M. 26th AIPR Workshop: Exploiting New Image Sources and Sensors. 1998; 3240: 242-250.

[36] Sheen DM, Hall TE, McMakin DL, Griffin JW. Circularly polarized millimeter-wave imaging for personnel screening. Passive Millimeter-Wave Imaging Technology VIII. 2005; 5789: 117-126.

[37] Sheen DM, Hall TE, McMakin DL. Cylindrical millimeter-wave imaging technique and applications. Passive Millimeter-Wave Imaging Technology IX. 2006; 6211: 58-67.

[38] Fortuny-Guasch J, Lopez-Sanchez JM. Extension of the 3-D range migration algorithm to cylindrical and spherical scanning geometries. IEEE Trans Antenn Propag. 2001; 49(10): 1434-1444.

[39] Gao J, Deng B, Qin Y, Li X, Wang H. Point cloud and 3-D surface reconstruction using cylindrical millimeter-wave holography. IEEE Trans Instrum Meas. 2019; 68(12): 4765-4778.

[40] Zhang Y, Jiang X, Ma Z, et al. An efficient interpolation-free algorithm for cylindrical millimeter-wave holographic three-dimensional reconstruction. Microw Opt Technol Lett. 2021; 63(4): 1018-1023.

[41] McMakin DL, Keller PE, Sheen DM, et al. Dual-surface dielectric depth detector for holographic millimeter-wave security scanners. Passive Millimeter-Wave Imaging Technology XII. 2009; 7309: 136-145.

[42] Qiao L, Wang Y, Zhao Z, et al. Total variance regularization for millimeter-wave holographic imaging. In: 2014 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz); 2014: 1-2.

[43] Qiao L, Wang Y, Li Z, et al. Algebraic reconstruction technique for millimeter-wave holographic imaging. In: 2015 40th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz); 2015: 1-2.

[44] Qiao L, Wang Y, Shen Z, Zhao Z, Chen Z. Compressive sensing for direct millimeter-wave holographic imaging. Appl Opt. 2015; 54(11): 3280-3289.

[45] Wang Z, Qiao L, Wang Y, et al. A wide-band three-dimensional submillimeter-wave imaging system based on vector network analyzer. In: 2016 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz); 2016: 1-2.

[46] Qiao L, Wang Y, Zhao Z, Chen Z. Exact reconstruction for near-field three-dimensional planar millimeter-wave holographic imaging. J Infrared Millim Terahertz Waves. 2015; 36(12): 1221-1236.

[47] Zheng L, Kang Y, Jun Z, et al. A synthetic targets detection method for human millimeter-wave holographic imaging system. In: 2016 7th International Conference on Cloud Computing and Big Data (CCBD); 2016: 284-288.

[48] Zhuge X, Yarovoy AG, Savelyev T, Ligthart L. Modified kirchhoff migration for UWB MIMO array-based radar imaging. IEEE Trans Geosci Rem Sens. 2010; 48(6): 2692-2703.

[49] Ayach OE, Rajagopal S, Abu-Surra S, Pi Z, Heath RW. Spatially sparse precoding in millimeter wave MIMO systems. IEEE Trans Wireless Commun. 2014; 13(3): 1499-1513.

[50] Vakalis S, Alsnayyan A. Near-field synthetic aperture radar utilizing a commercial V-Band MIMO radar sensor. In: 2023 IEEE International Symposium on Antennas and Propagation and. USNC-URSI Radio Science Meeting (USNC-URSI); 2023: 887-888.

[51] Muppala AV, Sarabandi K. A near-field 3-D imaging radar using a sparse spotlight MIMO array for weapons detection. In: 2023 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting (USNC-URSI). IEEE; 2023: 739-740.

[52] Manisali I, Oktem FS. Deep learning-based reconstruction for near-field MIMO radar imaging. In: 2023 31st European Signal Processing Conference (EUSIPCO); 2023: 481-485.

[53] Brinkmann M, Hamberger GF, Eibert TF. Nearfield multiple-input multiple-output inverse synthetic aperture radar for high-resolution imaging of large objects. In: 2023 20th European Radar Conference (EuRAD); 2023: 56-59.

[54] Deng G, Deng B, Chen X, et al. Efficient 3-D imaging algorithm for layered structures based on scanning 1-D MIMO array. IEEE J Sel Top Appl Earth Obs Rem Sens. 2022; 15: 8845-8855.

[55] Wang Z, Tian X, Chang T, Cui HL. Phase-based range-enhanced millimeter-wave imaging technique for multistatic planar array. IEEE Trans Microw Theor Tech. 2022; 70(3): 1882-1895.

[56] Ender JHG, Klare J. System architectures and algorithms for radar imaging by MIMO-SAR. 2009 IEEE Radar Conference. 2009: 1-6.

[57] Cooper KB. Performance of a 340 GHz radar transceiver array for standoff security imaging. In: 2014 39th International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz), Tucson, AZ, USA; 2014. 1-1.

[58] Zhuge X, Yarovoy AG. A sparse aperture MIMO-SAR-Based UWB imaging system for concealed weapon detection. IEEE Trans Geosci Rem Sens. 2011; 49(1): 509-518.

[59] Gumbmann F, Schmidt LP. Millimeter-wave imaging with optimized sparse periodic array for short-range applications. IEEE Trans Geosci Rem Sens. 2011; 49(10): 3629-3638.

[60] Hu S, Shu C, Alfadhl Y, Chen X. A THz imaging system using linear sparse periodic array. IEEE Sens J. 2020; 20(6): 3285-3292.

[61] Hu S, Shu C, Alfadhl Y, Chen X. W band imaging system using linear sparse periodic antenna array and compressive sensing for personnel screening. IEEE Access. 2019; 7: 173603-173611.

[62] Cooper KB, Reck TA, Jung-Kubiak C, et al. Transceiver array development for submillimeter-wave imaging radars. In: SPIE Defense, Security, and Sensing; 2013.87150A.

[63] Reck T, Jung-Kubiak C, Siles JV, et al. A silicon micromachined eight-pixel transceiver array for submillimeter-wave radar. IEEE Transactions on Terahertz Science and Technology. 2015; 5(2): 197-206.

[64] Cheng B, Cui Z, Lu B, et al. 340-GHz 3-D imaging radar with 4Tx-16Rx MIMO array. IEEE Transactions on Terahertz Science and Technology. 2018; 8(5): 509-519.

[65] Liu J. Terahertz security imaging system based on sparse linear array MIMO-SAR. Doctor's thesis, China Academy of Engineering Physics. 2018.

[66] Dvorsky M, Sim SY, Motes DT, et al. Multistatic Ka-Band (26.5–40 GHz) millimeter-wave 3-D imaging system. IEEE Trans Instrum Meas. 2023; 72(2): 1-14.

[67] Mandi Sanam P, Seyyed Talebi MJ, Kazemi M, Kavehvash Z, Shabany M. Thorough approach toward cylindrical MMW image reconstruction using sparse antenna array. IET Image Process. 2018; 12(8): 1458-1466.

[68] Li S, Wang S, Amin MG, Zhao G. Efficient near-field imaging using cylindrical MIMO arrays. IEEE Trans Aero Electron Syst. 2021; 57(6): 3648-3660.

[69] Tan K, Chen X. Precise near-range 3-D image reconstruction based on MIMO circular synthetic aperture radar. IEEE Trans Microw Theor Tech. 2021; 69(5): 2651-2661.

[70] Li S, Wang S, An Q, Zhao G, Sun H. Cylindrical MIMO array-based near-field microwave imaging. IEEE Trans Antenn Propag. 2021; 69(1): 612-617.

[71] Li S, Wang S, Wu S, et al. Millimeter-wave imaging via circular-arc MIMO arrays. IEEE Trans Microw Theor Tech. 2023; 71(7): 3156-3172.

[72] Wang S, Li S, An Q, Zhao G, Sun H. Near-field millimeter-wave imaging via arrays in the shape of polyline. IEEE Trans Instrum Meas. 2022; 71: 1-17.

[73] Wang S, Li S, Zhao G, Amin MG. Efficient wavenumber domain processing for near-field imaging with polyline arrays. IEEE Trans Microw Theor Tech. 2022; 70(10): 4544-4555.

[74] Xing G, Li S, Hoorfar A, An Q, Zhao G. Near-field millimeter-wave imaging via multi-plane MIMO arrays. IEEE Access. 2023; 11: 37347-37359.

[75] Desai MD, Jenkins WK. Convolution backprojection image reconstruction for spotlight mode synthetic aperture radar. IEEE Trans Image Process. 1992; 1(4): 505-517.

[76] Rodriguez-Cassola M, Prats P, Krieger G, Moreira A. Efficient time-domain image formation with precise topography accommodation for general bistatic SAR configurations. IEEE Trans Aero Electron Syst. 2011; 47(4): 2949-2966.

[77] Moll J, Schops P, Krozer V. Towards three-dimensional millimeter-wave radar with the bistatic fast-factorized back-projection algorithm—potential and limitations. IEEE Transactions on Terahertz Science and Technology. 2012; 2(4): 432-440.

[78] Zhang B, Xu G, Zhou R, Zhang H, Hong W. Multi-channel back-projection algorithm for mmWave automotive MIMO SAR imaging with doppler-division multiplexing. IEEE Journal of Selected Topics in Signal Processing. 2023; 17(2): 445-457.

[79] Soumekh M. Synthetic Aperture Radar Signal Processing with MATLAB Algorithms. Wiley; 1999.

[80] Gimeno-Nieves E, Lopez-Sanchez JM, Pascual-Villalobos C. Extension of the chirp scaling algorithm to 3-D near-field wideband radar imaging. IEE Proc - Radar, Sonar Navig. 2003; 150(3): 152-157.

[81] Zhang Y, Deng B, Yang Q, Gao J, Qin Y, Wang H. Near-field three-dimensional planar millimeter-wave holographic imaging by using frequency scaling algorithm. Sensors. 2017; 17(10): 2438.

[82] Gimeno E, Lopez-Sanchez JM. Near-field 2-D and 3-D radar imaging using a chirp scaling algorithm. IEEE International Geoscience and Remote Sensing Symposium. 2001; 1: 354-356.

[83] Liu W, Li C, Sun Z, Zhang Q, Fang G. A fast three-dimensional image reconstruction with large depth of focus under the illumination of terahertz gaussian beams by using wavenumber scaling algorithm. IEEE Transactions on Terahertz Science and Technology. 2015; 5(6): 967-977.

[84] Fortuny J, Sieber AJ. Three-dimensional synthetic aperture radar imaging of a fir tree: first results. IEEE Trans Geosci Rem Sens. 1999; 37(2): 1006-1014.

[85] Li Z, Wang J, Wu J, Liu QH. A fast radial scanned near-field 3-D SAR imaging system and the reconstruction method. IEEE Trans Geosci Rem Sens. 2015; 53(3): 1355-1363.

[86] Soumekh M. Range stacking: an interpolation-free SAR reconstruction algorithm. SPIE Conference on Algorithms for Synthetic Aperture Radar Imagery V. 1998; 3370: 13-24.

[87] Fortuny J, Sieber AJ. Fast algorithm for a near-field synthetic aperture radar processor. IEEE Trans Antenn Propag. 1994; 42(10): 1458-1460.

[88] Tan W, Hong W, Wang Y, Wu Y. A novel spherical-wave three-dimensional imaging algorithm for microwave cylindrical scanning geometries. Prog Electromagn Res. 2011; 111: 43-70.

[89] Zhu R, Zhou J, Wu J, et al. Dimension reduced time domain correlation algorithm for 3D cylindrical array imaging. J Signal Process. 2016; 32(7): 779-786.

[90] Sun Z, Li C, Gao X, Guangyou Fang. Minimum-entropy-based adaptive focusing algorithm for image reconstruction of terahertz single-frequency holography with improved depth of focus. IEEE Trans Geosci Rem Sens. 2015; 53(1): 519-526.

[91] Jiang Y, Wang H, Qin Y, Deng B, Gao J, Zhuang Z. A three-dimensional surface imaging method using THz dual-frequency interferometry. IEEE Geoscience and Remote Sensing Letters. 2016; 13(11): 1651-1655.

[92] Gao J, Qin Y, Deng B, Wang H, Li X. A novel method for 3-D millimeter-wave holographic reconstruction based on frequency interferometry techniques. IEEE Trans Microw Theor Tech. 2018; 66(3): 1579-1596.

[93] Molaei AM, Hu S, Skouroliakou V, Fusco V, Chen X, Yurduseven O. Fast processing approach for near-field terahertz imaging with linear sparse periodic array. IEEE Sens J. 2022; 22(5): 4410-4424.

[94] Moulder WF, Krieger JD, Majewski JJ, et al. Development of a high-throughput microwave imaging system for concealed weapons detection. 2016 IEEE International Symposium on Phased Array Systems and Technology (PAST). 2016: 1-6.

[95] Zhu R, Zhou J, Jiang G, Fu Q. Range migration algorithm for near-field MIMO-SAR imaging. IEEE Geoscience and Remote Sensing Letters. 2017; 14(12): 2280-2284.

[96] Zhu R, Zhou J, Cheng B, Fu Q, Jiang G. Sequential frequency-domain imaging algorithm for near-field MIMO-SAR with arbitrary scanning paths. IEEE J Sel Top Appl Earth Obs Rem Sens. 2019; 12(8): 2967-2975.

[97] Tan K, Chen X, Wu S, Fang G. Efficient frequency scaling algorithm for short-range 3-D holographic imaging based on a scanning MIMO array. IEEE Trans Microw Theor Tech. 2020; 68(9): 3885-3897.

[98] Yang G, Li C, Wu S, Liu X, Fang G. MIMO-SAR 3-D imaging based on range wavenumber decomposing. IEEE Sens J. 2021; 21(21): 24309-24317.

[99] Tan K. A fast Omega-K algorithm for near-field 3-D imaging of MIMO synthetic aperture radar data. IEEE Geoscience and Remote Sensing Letters. 2021; 18(8): 1431-1435.

[100] Yang G, Li C, Gao H, Li H, Zheng S, Fang G. Efficient phase shift migration for MIMO 2-D imaging in millimeter-wave band. IEEE Microw Wireless Compon Lett. 2021; 31(2): 215-218.

[101] Gao H, Li C, Wu S, et al. Study of the extended phase shift migration for three-dimensional MIMO-SAR imaging in terahertz band. IEEE Access. 2020; 8: 24773-24783.

[102] Gao H, Li C, Wu S, Zheng S, Li H, Fang G. Image reconstruction algorithm based on frequency-wavenumber decoupling for three-dimensional MIMO-SAR imaging. Opt Express. 2020; 28(2): 2411-2426.

[103] Wu S, Li C, Yang G, et al. Terahertz 3-D imaging for non-cooperative on-the-move whole body by scanning MIMO-Array-Based Gaussian Fan-Beam. IEEE Trans Antenn Propag. 2022; 70(12): 12147-12162.

[104] Li S, Sun H, Zhu B, Liu R. Two-dimensional NUFFT-based algorithm for fast near-field imaging. IEEE Antenn Wireless Propag Lett. 2010; 9: 814-817.

[105] Li S, Zhu B, Sun H. NUFFT-based near-field imaging technique for far-field radar cross section calculation. IEEE Antenn Wireless Propag Lett. 2010; 9: 550-553.

[106] Capozzoli A, Curcio C, Liseno A. Optimized nonuniform FFTs and their application to array factor computation. IEEE Trans Antenn Propag. 2019; 67(6): 3924-3938.

[107] Wang J, Aubry P, Yarovoy A. 3-D short-range imaging with irregular MIMO arrays using NUFFT-based range migration algorithm. IEEE Trans Geosci Rem Sens. 2020; 58(7): 4730-4742.

[108] Fan B, Gao J-K, Li H-J, Jiang Z-J, He Y. Near-field 3D SAR imaging using a scanning linear MIMO array with arbitrary topologies. IEEE Access. 2020; 8: 6782-6791.

[109] Diebold AV, Pulido-Mancera L, Sleasman T, Boyarsky M, Imani MF, Smith DR. Generalized range migration algorithm for synthetic aperture radar image reconstruction of metasurface antenna measurements. JOSA B. 2017; 34(12): 2610-2623.

[110] Gao J, Qin Y, Deng B, Wang H, Li X. Novel efficient 3D short-range imaging algorithms for a scanning 1D-MIMO array. IEEE Trans Image Process. 2018; 27(7): 3631-3643.

[111] Abbasi M, Shayei A, Shabany M, Kavehvash Z. Fast fourier-based implementation of synthetic aperture radar algorithm for multistatic imaging system. IEEE Trans Instrum Meas. 2019; 68(9): 3339-3349.

[112] Chen X, Wang H, Yang Q, Zeng Y, Deng B. An efficient mmW frequency-domain imaging algorithm for near-field scanning 1-D SIMO/MIMO array. IEEE Trans Instrum Meas. 2022; 71: 1-12.

[113] Chen X, Wang H, Yang Q, Zeng Y, Deng B. An efficient MMW 3-D imaging algorithm for near-field MIMO-SAR with nonuniform transmitting array. IEEE Antenn Wireless Propag Lett. 2022; 21(10): 2035-2039.

[114] Chen X, Yang Q, Wang H, Zeng Y, Deng B. Adaptive ADMM-based high-quality fast imaging algorithm for short-range MMW MIMO-SAR systems. IEEE Trans Antenn Propag. 2023; 71(11): 8925-8935.

[115] Chen X, Luo C, Yang Q, Yang L, Wang H. Efficient MMW image reconstruction algorithm based on ADMM framework for near-field MIMO-SAR. IEEE Trans Microw Theor Tech. 2024; 72(2): 1326-1338.

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