Application of Super-Sva to Stepped-Chirp Radar Imaging With Frequency Band Gaps Between Subchirps

Zhai, Wei; Zhang, Yunhua

doi:10.2528/pierb11032810

Cited by 12 publications

(9 citation statements)

References 10 publications

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“…Here we presented Ka band result obtained by using Super-SVA for Δf = 100MHz and B = 60MHz (same as in [23]). Before giving the images, quick introduction to Super-SVA is in order.…”

Section: Imaging With Super-svamentioning

confidence: 93%

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Moving target imaging by both Ka-band and Ku-band high-resolution radars

et al. 2011

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The experimental work on testing the wide-band transmitters and receivers developed for Ka-band and Ku-band radar systems, as well as the signal processing algorithms were introduced. A city light-railway train was selected as the imaged target. The wide-band transmitters and receivers were designed based on the stepped-frequency chirp signal (SFCS) with 2GHz bandwidth synthesized. The Super-SVA technique was used to deal with the case of transmitting SFCS with band gaps between subchirps for purpose of achieving the same bandwidth using as less as possible subpulses. Both Ka-band and Ku-band high-resolution radar images were obtained, which show that Ka-band images are much clear than that of Ku-band as we expect. There are two reasons to explaining this, one reason is due to the electromagnetic scattering of train itself are different for Ka-band and Ku-band frequencies, and the other reason is due to the interactions, i.e. multi-reflection or multi-scattering between the train and the side metal fences or the lamp post are different.

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“…Here we presented Ka band result obtained by using Super-SVA for Δf = 100MHz and B = 60MHz (same as in [23]). Before giving the images, quick introduction to Super-SVA is in order.…”

Section: Imaging With Super-svamentioning

confidence: 93%

“…Long Zhuang applied it to sparse aperture radar imaging to get full aperture data [22]. In [23] Super-SVA has been applied to filling+ the band gaps between subpulses of SFCS with frequency step Δf > B, and real Ku band data has been processed.…”

Section: Imaging With Super-svamentioning

confidence: 99%

Moving target imaging by both Ka-band and Ku-band high-resolution radars

et al. 2011

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“…Different from the sparse stepped frequency chirp signal used in [22,23], the bandwidth of the chaotic signal of each subpulse is much larger, so we can synthesize a wideband with just fewer subpulses and the model has more advantages in antijamming. Compared with the Super-SVA technique used in [36], the CS approach we proposed is more robust, and the frequency gaps between subpulses can be larger than the bandwidth of one subpulse.…”

Section: Introductionmentioning

confidence: 99%

“…There were some methods proposed to overcome these drawbacks. In [36], the authors applied super-SVA methods to fill the spectrum gaps between subchirps in SFCS model. However when the gaps are larger than the bandwidth of one subchirp, the method may fail.…”

Section: Introductionmentioning

confidence: 99%

A Novel Sparse Stepped Chaotic Signal and Its Compression Based on Compressive Sensing

Yang¹,

Zhang²

2013

PIER

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Abstract-We propose a novel signal model by combining the sparse stepped frequency signals with chaotic signals, i.e., the sparse stepped chaotic signal (SSCS) model, as well as the corresponding compression algorithm based on compressed sensing. In SSCS, the chaotic signals are modulated to sparse stepped frequencies to compose a transmitting burst. When receiving, the echo signals are demodulated to the baseband and then can be sampled directly at a rate much lower than the Nyquist rate determined by the bandwidth of chaotic signal of each subpulse. Compared with radars using conventional stepped frequency waveforms, the SSCS radar can transmit fewer subpulses in a burst and directly use lower speed ADC next to the receiver. Both simulated and real radar data are processed to demonstrate the effectiveness of the proposed SSCS as well as the compression algorithm by which high resolution range profiles are very well reconstructed.

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“…Frequency stepped chirp radar (FSCR) is a kind of HRR radar and is widely used in recent years [3][4][5][6], for it can achieve high range resolution while still retaining the advantages of narrow instantaneous receiver bandwidth and low analog-to-digital (AD) sampling rate. FSCR transmits a chirp train with frequency stepped carriers, and achieves high range resolution by synthesis wide-band technique.…”

Section: Introductionmentioning

confidence: 99%

Range Alignment and Motion Compensation for Missile-Borne Frequency Stepped Chirp Radar

Liu¹,

Chang²

2013

PIER

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Abstract-One of the difficulties for frequency stepped chirp radar (FSCR) is to resolve the range-Doppler coupling due to relative motion between the radar and the target. Motion compensation is usually adopted to solve the problem in realizing synthetic high range resolution profile (HRRP) for a moving target. For missileborne FSCR, the range migration of target echo during a coherent processing interval, which is resulted from the high speed motion of missile, is serious and will affect target detection and synthetic high range resolution profile. Therefore, range migration correction and motion compensation are very important for missile-borne FSCR signal processing. In the paper, with the background of terminal guidance anti-ship FSCR seeker, the range alignment is accomplished in frequency domain during the process of real-time digital pulse compression. Then an effective velocity estimation algorithm based on the waveform entropy of the Doppler amplitude spectrum of target echoes is addressed and the velocity estimation accuracy is derived. Finally, the simulation indicates that the new method can estimate the radial velocity accurately and reconstruct the distorted HRRP successfully. In addition, the method has good anti-noise performance and works in the scenario of multi-target with different velocities as well.

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Application of Super-Sva to Stepped-Chirp Radar Imaging With Frequency Band Gaps Between Subchirps

Cited by 12 publications

References 10 publications

Moving target imaging by both Ka-band and Ku-band high-resolution radars

Moving target imaging by both Ka-band and Ku-band high-resolution radars

A Novel Sparse Stepped Chaotic Signal and Its Compression Based on Compressive Sensing

Range Alignment and Motion Compensation for Missile-Borne Frequency Stepped Chirp Radar

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