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Zhu X.-P.,Institution of Telecommunication Engineering | Zhang Q.,Institution of Telecommunication Engineering | Zhang Q.,Shanghai University | Li H.-W.,Institution of Telecommunication Engineering
2010 9th International Symposium on Antennas Propagation and EM Theory, ISAPE 2010 | Year: 2010

This paper studies the basic issue of Bistatic ISAR imaging using FMCW radar under the model of Bistatic radar systems. Firstly, the echo signal of FMCW radar which in Bistatic system is analyzed, the coupling terms of range fast time and azimuth slow time which including uniquely in FMCW signal are extracted from the phase of echo signal,; then its forms in range Doppler domain and influences to range profile are analyzed; Simultaneously the corresponding compensation algorithm is applied to compensate the coupling terms. The last simulations show that the proposed compensation algorithm in this paper improves the defocus phenomenon which caused by using FMJCW signal and can achieve good imaging of targets. ©2010 IEEE. Source

He J.,Institution of Telecommunication Engineering | Zhang Q.,Institution of Telecommunication Engineering | Zhang Q.,Fudan University | Luo Y.,Institution of Telecommunication Engineering | And 2 more authors.
Journal of Applied Remote Sensing | Year: 2011

The micro-Doppler (m-D) effect describes the subtle micromotion features of a radar target and provides a new approach for feature extraction and auto radar target recognition. However, the microwave radar cannot provide enough resolution to detect the m-D effect of small targets and long distance targets. In order to obtain high range resolution for the extraction of subtle m-D signatures, inverse synthetic aperture imaging LADAR (ISAIL) is used here. Because the ISAIL uses a frequency modulation continuous wave signal, the m-D effect of ISAIL is different from the microwave radar. In this paper, the m-D effect of ISAIL is analyzed. The features of the m-D signatures in ISAIL are extracted by an improved Hough transform method associated with erosion and dilation operations in binary mathematical morphology. The simulations are given to validate the theoretical analyses and the proposed m-D extraction method. The experiment results show that the ISAIL can offer sufficient information of micromotions when the feature of motions is tiny. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). Source

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