A 2-D Method Based on Nonlinear Frequency Modulation Waveform and Phase Coding for Range Ambiguity Suppression

Wang, Yuhao; Wang, Wei; Deng, Yunkai; Zhang, Yongwei; Zhao, Pengfei; Zhang, Heng

doi:10.1109/lgrs.2022.3233706

Cited by 4 publications

(3 citation statements)

References 13 publications

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“…In order to solve the orthogonality problem of the same frequency waveforms, slowtime phase-coded waveforms were explored in references [22][23][24][25][26][27][28][29][30][31] and used for range ambiguity suppression [22][23][24][25][26][29][30][31]. Ref.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Multi-Beam SAR Two-Dimensional Ambiguity Suppression Method Based on Azimuth Phase Coding

Xu,

Zhang,

et al. 2024

Remote Sensing

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In order to address the problems of range ambiguity and azimuth ambiguity in the wide-swath imaging of synthetic aperture radar (SAR), this paper proposes a multi-beam SAR two-dimensional ambiguity suppression method based on azimuth phase coding (APC). The scheme employs an elevation simultaneous multi-beam transmission system with azimuth under-sampling, transmitting different APC waveforms to various range-ambiguous sub-regions. After receiving the echoes, the azimuth digital beamforming (DBF) is used to separate the APC waveform echoes with multi-order Doppler ambiguity, achieving azimuth reconstruction and range ambiguity suppression simultaneously. Finally, the elevation nulling DBF is used to further suppress range ambiguity and obtain the SAR wide-swath image. The superiority of this scheme is reflected in the following aspects: the azimuth DBF simultaneously suppresses azimuth and range ambiguity, the influence of height fluctuations on the ability to suppress range ambiguity is weakened, the use of elevation nulling DBF further enhances the level of range ambiguity suppression, and different range sub-regions can adopt different range resolutions and working modes. The feasibility of this scheme is verified through theoretical analysis and simulation.

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Section: Introductionmentioning

confidence: 99%

“…Ref. [26] combined the azimuth phase coding (APC) waveform with two orthogonal nonlinear frequency modulation waveforms to achieve the separation of continuous order ambiguity. However, it only discussed one APC waveform.…”

Section: Introductionmentioning

confidence: 99%

A Novel Multi-Beam SAR Two-Dimensional Ambiguity Suppression Method Based on Azimuth Phase Coding

Xu,

Zhang,

et al. 2024

Remote Sensing

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“…As a result, the response function of the LFM waveform after performing pulse compression has the shape of a sinc function with a peak-to-sidelobe ratio (PSLR) of approximately −13.26 dB. Non-linear FM (NLFM) waveform with a certain PSD shape is also widely used, which provides a radar output with inherently low range sidelobes [11][12][13][14][15][16][17][18]. In this paper, a novel transmission loss compensation method is proposed based on NLFM waveform design, which can obtain the result with a flat frequency response.…”

mentioning

confidence: 99%

A novel transmission loss compensation method for radome based on non‐linear frequency modulation waveform design

Liang¹,

Li²,

Fu³

et al. 2023

Electronics Letters

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The radome can protect the enclosed antenna from harsh weather and environmental conditions; however, it will cause a non‐negligible effect particularly transmission loss on the wideband signal which has been widely used in electronic systems. For this, a novel transmission loss compensation method for radome based on non‐linear frequency modulation (NLFM) waveform design is proposed. First, the transmission coefficient calculation process is given, Then, the detailed NLFM waveform design method is described in detail. Finally, the simulation experiments are demonstrated to verify the effectiveness of the proposed compensation method. Based on the designed NLFM waveform, the transmission loss can be compensated and a flat frequency response can be obtained, which can achieve excellent performance of pulse compression in the range direction. The proposed NLFM design method has great potential application value in the electronic system.

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High-resolution wide-swath SAR imaging with multifrequency pulse diversity mode in azimuth multichannel system

Zhang,

Lu,

et al. 2024

International Journal of Remote Sensing

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A 2-D Method Based on Nonlinear Frequency Modulation Waveform and Phase Coding for Range Ambiguity Suppression

Cited by 4 publications

References 13 publications

A Novel Multi-Beam SAR Two-Dimensional Ambiguity Suppression Method Based on Azimuth Phase Coding

A Novel Multi-Beam SAR Two-Dimensional Ambiguity Suppression Method Based on Azimuth Phase Coding

A novel transmission loss compensation method for radome based on non‐linear frequency modulation waveform design

High-resolution wide-swath SAR imaging with multifrequency pulse diversity mode in azimuth multichannel system

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