ISAR imaging in strong ground clutter using a new stepped-frequency signal format

Zhang, Qun; Yeo, Tat‐Soon; Du, G.

doi:10.1109/tgrs.2003.811760

Cited by 24 publications

(21 citation statements)

References 4 publications

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“…In addition, the frequency-hopping code corresponding to the first CCM sequence is [0, 15,12,16,14,10,6,13,2,8,9,7,11,1,5,17,19,18,3,4], while the frequency-hopping code corresponding to the second CCM sequence is [0, 16,1,5,18,7,4,15,6,13,9,11,17,10,3,2,19,8,14,12]. Only the first elements of the two frequency-hopping codes are the same, while the others are completely different.…”

Section: Frequency-hopping Codementioning

confidence: 99%

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Wide-Band Chaotic Noise Signal for Velocity Estimation and Imaging of High-Speed Moving Targets

Yang¹,

Zhang²,

Gu³

2015

PIER B

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Abstract-This paper proposes a burst model of chaotic noise signals with randomly stepped carrier frequencies for velocity estimation and high-resolution range imaging of high-speed moving targets. The random stepping of carrier frequencies is controlled by a combination chaotic map (CCM), which is generated by embedding a Logistic map into a Bernoulli map. The baseband noise signal adopts the CCM based frequency-modulation (CCM-FM) signal, which has good randomness and a thumbtack ambiguity function as well. The velocity estimation includes a coarse search and a precise search, where the coarse search is conducted with a fixed step to makes the velocity deviation less than the velocity resolution, while the precise search adopts the Golden Section Search (GSS) algorithm to get an accurate estimation of velocity. What should be emphasized is that the velocity estimation process can be completed with just a burst of subpulses. Then the spectra are coherently synthesized to obtain ultra-wide bandwidth and high-resolution range imaging. Finally, numerical simulations demonstrate a good performance of the proposed signal model and the processing algorithm.

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Section: Frequency-hopping Codementioning

confidence: 99%

“…To obtain ultra-wide synthesized bandwidth while keep low instantaneous bandwidth, stepped-frequency signal is proposed [8,9]. But the size of frequency step restricts the non-ambiguity range interval [10], so it may suffer from ambiguous peaks, known as "grating lobes" [11].…”

Section: Introductionmentioning

confidence: 99%

Wide-Band Chaotic Noise Signal for Velocity Estimation and Imaging of High-Speed Moving Targets

Yang¹,

Zhang²,

Gu³

2015

PIER B

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“…The high-resolution image even can be utilized for the purposes of feature extraction and target recognition of noncooperative targets [9][10][11]. In order to improve the range resolution and the detection range, large time-bandwidth product waveforms, such as chirp signal, frequency-stepped signal, and frequencystepped chirp signal, are commonly utilized in modern imaging radar systems [9,[12][13][14][15][16]. The superiority of chirp signal is that it can improve the range resolution while maintaining a high signal-to-noise ratio (SNR) via intrapulse frequency modulation and pulse compression technology.…”

Section: Introductionmentioning

confidence: 99%

High-Resolution ISAR Imaging with Wideband V-FM Waveforms

Feng¹,

Pan²,

Wang³

2017

International Journal of Antennas and Propagation

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V-FM waveforms, composed of two chirp signals with the opposite slopes, can also achieve high range resolution with wide bandwidth via intrapulse frequency modulation. In this paper, a framework for inverse synthetic aperture radar (ISAR) imaging of moving targets with V-FM waveforms is investigated, where the range compression of the received signals is achieved by the dual-channel dechirping and the azimuth compression is done via the traditional Fourier transform (FT). The two corresponding reconstructed temporary high-resolution range profiles (HRRPs) from the double channels are synthesized for the HRRPs of the target, in which one is flipped from left to right and added to the other. Then the final HRRPs are arranged into a two-dimensional (2D) array and the azimuth compression is done via FT to achieve the ISAR imaging after the motion compensation. Simulated trials, adopting the scattering center modeling of the Yak-42 plane, are used to validate the correctness of the analyses and the finally well-focused images greatly support the effectiveness of V-FM waveforms in ISAR imaging.

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“…To meet the requirements of higher resolution, stepped frequency technique has become an alternative method for radar systems. Stepped frequency chirp signal (SFCS), as an important signal form of SAR imaging, has been used to achieve high resolution with low instantaneous bandwidth and low sampling rate, and has been paid more and more attention [1][2][3][4][5][6]. By transmitting a train of narrow-bandwidth chirp pulses carried on stepped frequencies, the corresponding echoes are then received and synthesized into a much wider band signal so as to achieve high range resolution.…”

Section: Introductionmentioning

confidence: 99%

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mentioning

confidence: 99%

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

Zhai¹,

Zhang²

2011

PIER B

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Abstract-It is well-known that the stepped-frequency chirp signal (SFCS) technique is one of the very effective approaches for achieving high range resolution in radar [1][2][3][4][5]. The SFCS is a train of subchirp pulses with up-stepped or down-stepped carrier frequencies. However, there exists a rang-Doppler coupling problem (RDCP) when applying this signal to practical radar system because longer time is needed for transmitting a complete burst compared with that needed for transmitting just a single chirp. In radar system design, if carrier frequency step (∆f ) can be larger than the bandwidth of subchirp (B m ), it will be very helpful for using less number of subchirps to obtain high resolution and at the same time reduce the influence of RDCP on imaging quality. However, the spectrum of transmitted signal will not be continuous but with band gaps existing when ∆f > B m , and it will lead to high grating lobes in range profile. In this paper, the Super-SVA technique is applied to solve the grating lobe problem arisen from band gaps in SFCS. Simulation and experiment results for moving train imaging are presented to show that the algorithm works very well.

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ISAR imaging in strong ground clutter using a new stepped-frequency signal format

Cited by 24 publications

References 4 publications

Wide-Band Chaotic Noise Signal for Velocity Estimation and Imaging of High-Speed Moving Targets

Wide-Band Chaotic Noise Signal for Velocity Estimation and Imaging of High-Speed Moving Targets

High-Resolution ISAR Imaging with Wideband V-FM Waveforms

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

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