In traditional, the way to measure the velocity of moving targets using FrFT(fractional Fourier transform) is based on 2D searching. The FrFT is calculated by traversing all angles and the optimal solution is the peak value of 2D plane. The method needs to trade off computational accuracy and computational complexity. In this paper, a new method of velocity measurement and location for moving targets is proposed. Firstly, the FrFT of two different angles and their projection are calculated. Then, the optimal rotation angle for moving target is calculated by using geometric relationship in the time-frequency plane. Finally, the FrFT under the optimal rotation angle is calculated, and velocity and position parameters of moving target are calculated. Moreover, static cluster can be suppressed if two angles for FrFT are symmetric about π. In general, the proposed method is faster and more accurate than the traditional method. The effectiveness and superiority of the method are verified by simulation and real data experiments.
SHEN Xiaotian
,
ZHENG Mingjie
. A new method of moving target velocity measurement and location based on FrFT[J]. Journal of University of Chinese Academy of Sciences, 2023
, 40(1)
: 84
-92
.
DOI: 10.7523/j.ucas.2021.0017
[1] Zheng M J, Yan H, Zhang L, et al. Research on strong clutter suppression for Gaofen-3 dual-channel SAR/GMTI[J]. Sensors (Basel, Switzerland), 2018, 18(4): 978.DOI：10.3390/S18040978.
[2] He X P, Liao G S, Zhu S Q, et al. Range-ambiguous clutter suppression for the SAR-GMTI system based on extended azimuth phase coding[J]. IEEE Transactions on Geoscience and Remote Sensing, 2020, 58(11):8147-8162.DOI：10.1109/TGRS.2020.2987630.
[3] Sun Q Y, Shu T, Tang M, et al. Effective moving target deception jamming against multichannel SAR-GMTI based on multiple jammers[J]. IEEE Geoscience and Remote Sensing Letters, 2020, 17(3):441-445.DOI：10.1109/LGRS.2019.2921678.
[4] Guo Y F, Liao G S, Li J, et al. A clutter suppression method based on NSS-RPCA in heterogeneous environments for SAR-GMTI[J]. IEEE Transactions on Geoscience and Remote Sensing, 2020, 58(8):5880-5891.DOI：10.1109/TGRS.2020.2972.060.
[5] Yang Z W, Xu H J, Huang P H, et al. Preliminary results of multichannel SAR-GMTI experiments for airborne quad-pol radar system[J]. IEEE Transactions on Geoscience and Remote Sensing, 2020, 58(6):3822-3840.DOI：10.1109/TGRS.2019.2958488.
[6] Tian M, Yang Z W, Duan C D, et al. A method for active marine target detection based on complex interferometric dissimilarity in dual-channel ATI-SAR systems[J]. IEEE Transactions on Geoscience and Remote Sensing, 2020, 58(1):251-267.DOI：10.1109/TGRS.2019.2936150.
[7] Wacks S, Yazıcı B. Doppler-DPCA and Doppler-ATI: novel SAR modalities for imaging of moving targets using ultra-narrowband waveforms[J]. IEEE Transactions on Computational Imaging, 2018, 4(1):125-136.DOI：10.1109/TCI.2017.2782639.
[8] Yu L J, Zhang Y H. Application of the fractional Fourier transform to moving train imaging[J]. Progress in Electromagnetics Research M, 2011, 19:13-23.DOI：10.2528/pierm1151401.
[9] Li Q N, He L, Qi L J, et al. Unique decomposition and a new model for the ground moving target indication problem[J]. Journal of Optimization Theory and Applications, 2017, 173(1):297-312.DOI：10.1007/S10957-016-1052-5.
[10] Chiu S. Moving target parameter estimation for RADARSAT-2 moving object detection experiment (MODEX)[J]. International Journal of Remote Sensing, 2010, 31(15):4007-4032.DOI：10.1080/01431160903032901.
[11] Chiu S. Application of fractional Fourier transform to moving target indication via along-track interferometry[J]. EURASIP Journal on Advances in Signal Processing, 2005, 2005(20):3293-3303.DOI：10.1155/ASP.2005.3293.
[12] Zhang X P, Yang C, Lin Q Q, et al. Efficient parameters estimation methods for radar moving targets without searching[J]. IEEE Access, 2020, 8:41351-41361.DOI：10.1109/ACCESS.2019.2957383.
[13] Cerutti-Maori D, Klare J, Brenner A R, et al. Wide-area traffic monitoring with the SAR/GMTI system PAMIR[J]. IEEE Transactions on Geoscience and Remote Sensing, 2008, 46(10):3019-3030.DOI：10.1109/TGRS.2008.923026.
[14] Wang C H, Liao G S, Zhang Q J. First spaceborne SAR-GMTI experimental results for the Chinese Gaofen-3 dual-channel SAR sensor[J]. Sensors (Basel, Switzerland), 2017, 17(11): 2683.DOI：10.3390/S17112683.
[15] 郑明洁, 杨汝良. 基于DPCA和干涉技术的SAR动目标检测[J].电子与信息学报,2003, 25(11):1525-1530.
[16] 孙娜, 周荫清, 李景文. 基于DPCA技术的星载SAR/GMTI处理方法[J].电子与信息学报,2005, 27(10):1564-1568.
[17] 王艳霞, 张毅. 机载单天线SAR动目标检测与参数估计[J]. 中国科学院研究生院学报, 2012, 29(2):227-233.DOI：10.7523/j.issn.2095-6134.2012.2.012.
