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Sensors 2015, 15(9), 23188-23204; doi:10.3390/s150923188

ISAR Imaging Based on the Wideband Hyperbolic Frequency-ModulationWaveform

1
Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
2
Beijing Institute of Radio Measurement, Beijing 100039, China
*
Author to whom correspondence should be addressed.
Academic Editor: Assefa M. Melesse
Received: 26 June 2015 / Revised: 28 August 2015 / Accepted: 9 September 2015 / Published: 15 September 2015
(This article belongs to the Section Remote Sensors)
View Full-Text   |   Download PDF [1686 KB, uploaded 15 September 2015]   |  

Abstract

The hyperbolic frequency-modulated (HFM) waveform has an inherent Doppler-invariant property. It is more conducive than the conventional linear frequency-modulated (LFM) waveform to high speed moving target imaging. In order to apply the HFM waveform to existing inverse synthetic aperture radar (ISAR) imaging systems, a new pulse compression algorithm is proposed. First, the received HFM echoes are demodulated with the transmitted signal, which is called “decurve” in this paper. By this operation, the bandwidth of the demodulated echoes is effectively reduced and can be processed by the existing narrow-band receiver. Then, the phase of the decurved HFM echoes is analyzed, and thus, the pulse compression is accomplished by space-variant phase compensation. In addition, the space-variant phase compensation is realized by resampling and fast Fourier transform (FFT) with high computational efficiency. Finally, numerical results illustrate the effectiveness of the proposed method. View Full-Text
Keywords: inverse synthetic aperture radar (ISAR); hyperbolic frequency modulated (HFM); linear frequency modulated (LFM); Doppler invariant; pulse compression inverse synthetic aperture radar (ISAR); hyperbolic frequency modulated (HFM); linear frequency modulated (LFM); Doppler invariant; pulse compression
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Zhou, W.; Yeh, C.-M.; Jin, K.; Yang, J.; Lu, Y.-B. ISAR Imaging Based on the Wideband Hyperbolic Frequency-ModulationWaveform. Sensors 2015, 15, 23188-23204.

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