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| Waveform Design and Imaging Algorithm Research of Random Frequency Stepped Chirp Signal ISAR |
| He Jin① Luo Ying① Zhang Qun①② Yang Xiao-you① |
①(Telecommunication Engineering Institute, Air Force Engineering University, Xi’an 710077, China)
②(Key Laboratory of Wave Scattering and Remote Sensing Information (Ministry of Education), Fudan University, Shanghai 200433, China) |
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Abstract Frequency-stepped chirp signal is an effective radar signal which can utilize the digital signal processing to obtain high range resolution with relatively narrow instantaneous bandwidth. Because the anti-jamming ability of frequency-stepped chirp signal radar is not enough, the random frequency-stepped chirp signal is designed, and a random frequency-stepped chirp signal ISAR imaging algorithm based on compress sensing theory is proposed. The range profile and high resolution 2-D ISAR image can be obtained with fewer subpulses. Then, the target velocity’s influence on frequency-stepped chirp signal radar imaging is analyzed, the random frequency-stepped chirp signal which contains velocity measuring subpulses is designed, and the velocity estimate and compensation method which is combined with time-frequency analysis, Radon transform and binary mathematical morphology is proposed. The simulation verifies the capability of random frequency-stepped chirp signal ISAR and effectiveness of the imaging algorithm proposed in this paper.
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Received: 14 January 2011
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Corresponding Authors:
He Jin
E-mail: hjelva@163.com
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2011, Vol. 33 
