Imaging and Doppler parameter estimation for maneuvering target using axis mapping based coherently integrated cubic phase function |
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| Affiliation: | 1. School of Electronics and Information, Northwestern Polytechnical University, Xi''an 710072, China;2. National Laboratory of Radar Signal Processing, Xidian University, Xi''an 710071, China;1. IFIMUP and IN-Institue of Nanoscience and Nanotechnology, Departamento de Física da Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre. 687, 4169-007 Porto, Portugal;2. CFNUL - Centro de Física Nuclear da Universidade de Lisboa, Av. Prof. Gama Pinto, 2, 1649-003 Lisboa, Portugal;3. Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza and Consejo Superior de Investigaciones Cientificas, 50009 Zaragoza, Spain;4. Instituto de Nanociencia de Aragón-ARAID, Universidad de Zaragoza, 50009 Zaragoza, Spain;5. Departamente de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain;6. Instituto de Nanociencia de Aragon, Universidad de Zaragoza, 50009 Zaragoza, Spain;7. CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal;8. Radboud University of Nijmegen, High Field Magnet Laboratory, Toernooiveld 7, 6525 ED Nijmegen, The Netherlands;9. NSSD, P.O. Box 2008, MS6475, Oak Ridge, TN 37831-6475, USA;10. Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA;1. Department of Physics, Science College, Zhejiang Sci-Tech University, 928 2nd Street, Hangzhou 310018, China;2. Shanghai Aerospace Control Technology Institute, No. 1555, ZhongChun Road, Shanghai, 201109, China;3. Department of Optical Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310013, China;1. PDPM-Indian Institute of Information Technology Design and Manufacturing, Jabalpur 482005, India;2. Indian Institute of Technology Roorkee, Roorkee 247667, India;1. School of Physics and Optoelectronic Engineering, Yangtze University, Jingzhou, Hubei, 434023, China;2. School of Physics and Electronics, Central South University, Changsha, Hunan, 410083, China |
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| Abstract: | In this paper, we propose a novel imaging and Doppler parameter estimation algorithm for ground maneuvering targets. Since the cross-track acceleration will induce the quadratic chirp rate (third-order phase) in the phase history, it may cause the maneuvering target severely smeared in the Doppler domain. To obtain a well-focused target imaging result, the quadratic chirp rate must be estimated accurately. Though cubic phase function (CPF) is efficient in estimating the parameters of a single maneuvering target, it may suffer from the identifiability problem when dealing with multiple maneuvering targets. To address these issues, an axis mapping (AM) based coherently integrated cubic phase function (CICPF) algorithm is proposed. This algorithm consists of two stages. Firstly, the linear chirp rate migration (i.e. quadratic chirp rate) of target in the time and chirp-rate domain is corrected by AM. After that, a dechirping technique is utilized to coherently integrate the auto-terms, and suppress the cross-terms and spurious peaks. Compared with several existing quadratic chirp rate estimation approaches, AM based CICPF (AMCICPF) algorithm can acquire lower signal-to-noise ratio threshold and estimate the centroid frequency, chirp rate and quadratic chirp rate of maneuvering target simultaneously. By compensating the chirp rate and quadratic chirp rate, a finely focused maneuvering target imaging can be obtained. Both simulated and real data processing results show that the AMCICPF algorithm serves as a good candidate for maneuvering target Doppler parameter estimation and imaging. |
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| Keywords: | Parameter estimation Quadratic frequency modulated signal Axis mapping Cubic phase function |
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