Pattern Synthesis Algorithm for Range Ambiguity Suppression in the LT-1 Mission via Sequential Convex Optimizations

Yang, Ce; Ou, Naiming; Deng, Yunkai; Liu, Dacheng; Zhang, Yanyan; Wang, Nan; Wang, Robert

doi:10.1109/tgrs.2021.3099132

Cited by 12 publications

(9 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, the RASR of cross-pol echo signals cannot meet that. Therefore, DBF or antenna pattern synthesis [28] needs to be adopted to reduce the influence of RASR on the SAR system.…”

Section: The First Imaging Modementioning

confidence: 99%

“…Therefore, it is a better approach to estimate its range ambiguity performance by scene simulations. A simple theoretical analysis of the second mode reveals that its range ambiguity is serious, and it also needs to be suppressed by DBF or antenna pattern synthesis operation [28].…”

Section: Aasr ≈mentioning

confidence: 99%

“…As shown in Figure 6b, the azimuth ambiguity of the HV image derived by hybrid quad-pol SAR is serious compared with the input image of (a), and it is hard to determine the number of vessels at sea, as shown in the area selected by the red box. Besides, it is difficult for the first imaging mode to remove the range ambiguity in the absence of DBF or antenna pattern synthesis operation [28], resulting in the submergence of vessels by strong ambiguity targets on the urban area, as shown in (c). However, the vessels can be clearly seen in the image obtained by the first imaging mode with DBF, as shown in the selected area of (d), and this indicates that the first imaging mode has the capability of azimuth ambiguity suppression.…”

Section: Simulationsmentioning

confidence: 99%

“…However, the vessels can be clearly seen in the image obtained by the first imaging mode with DBF, as shown in the selected area of (d), and this indicates that the first imaging mode has the capability of azimuth ambiguity suppression. It should be mentioned that Figure 6c is the result of superposition of one SAR image from the target area and another urban image from the ambiguity area, as described in [28], and (d) is the result of suppressing the ambiguity area energy using the sixteen-channel DBF filter. The polarimetric SAR images obtained by the second imaging mode with DBF are shown in Figure 7.…”

Section: Simulationsmentioning

confidence: 99%

“…Specifically, the high-order range ambiguity is the large portion of the overall range ambiguity energy, and it can be filtered out by DBF in the pre-processing phase. Similar to DBF, the antenna pattern synthesis for range ambiguity suppression is another candidate [28]. Afterwards, the mature imaging algorithms, including back projection (BP) [29], chirp scaling (CS) [30] and extended chirp scaling (ECS) [31][32][33] can be used to image the echo signals.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

A Novel Weighted Amplitude Modulation (WAM) System for Ambiguity Suppression of Spaceborne Hybrid Quad-Pol SAR

et al. 2021

Self Cite

View full text Add to dashboard Cite

Quadrature-polarimetric synthetic aperture radar (quad-pol SAR) has extensive applications, including climate zones classification, extraction of surface roughness, soil moisture mapping, moving target indication, and rice mapping. Hybrid quad-pol SAR ameliorates the range ambiguity performance of conventional quad-pol SAR. However, the azimuth ambiguity of its cross-polarized (cross-pol) echo signals is serious, limiting the swath width of SAR. Therefore, this paper proposes a spaceborne weighted amplitude modulation (WAM) full-polarimetric (full-pol) SAR system, and it can suppress the azimuth ambiguity of hybrid quad-pol SAR. The performance boost of the azimuth ambiguity by the two imaging modes of the proposed SAR system is detailed and evaluated with the L-band system parameters. Moreover, the chirp scaling algorithm (CSA) is adopted to execute scene simulations for the two imaging modes. The results indicate that the proposed SAR system can effectively suppress the azimuth ambiguity of hybrid quad-pol SAR and verify the theoretical analysis.

show abstract

“…However, the RASR of cross-pol echo signals cannot meet that. Therefore, DBF or antenna pattern synthesis [28] needs to be adopted to reduce the influence of RASR on the SAR system.…”

Section: The First Imaging Modementioning

confidence: 99%

Section: Aasr ≈mentioning

confidence: 99%

Section: Simulationsmentioning

confidence: 99%

Section: Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Novel Weighted Amplitude Modulation (WAM) System for Ambiguity Suppression of Spaceborne Hybrid Quad-Pol SAR

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

Removal of Range Ambiguity in SAR Images Based on Blind Separation Method

Li,

Tao,

Tang

et al. 2023

2023 4th China International SAR Symposium (CISS)

View full text Add to dashboard Cite

A Joint Azimuth Multichannel Cancellation (JAMC) Antibarrage Jamming Scheme for Spaceborne SAR

Cheng

Sun²,

Cai

et al. 2022

IEEE J. Sel. Top. Appl. Earth Observations Remote Sensing

View full text Add to dashboard Cite

The azimuth multichannel synthetic aperture radar (SAR) increases the swath width by reducing the pulse repetition frequency (PRF), thus providing an effective scheme for realizing high-resolution and wide-swath (HRWS) imaging simultaneously. However, the quality of multichannel SAR images will suffer from electromagnetic jamming in the electronic antagonism environment. The existing channel cancellation methods not only require high positioning accuracy of the jammer and high PRF of the SAR system, but also remain periodic dark stripes, which reduce the readability of the SAR images. To solve these problems, this article proposes a scheme for multichannel SAR to locate the barrage jammer and suppress jamming signals. Firstly, by establishing the least L 1 -norm optimization model on the echoes after channel cancellation, the location of the jammer in both azimuth and range directions can be accurately estimated. Then, based on the estimated jammer position, a joint cancellation filter is constructed to remove the jamming signal from the contaminated multichannel SAR data. And the reconstruction filter is designed according to the characteristics of the remaining signal, so that the SAR system reduces the requirement for high PRF. Finally, for the case of dark strips, this paper calculates the image amplitude equalization coefficient by deducing the azimuth modulation function, and a uniform HRWS SAR image without jamming is acquired. Results of simulated and measured data validate that the proposed method can effectively remove jamming signals and obtain the HRWS SAR images.

show abstract

Pattern Synthesis Algorithm for Range Ambiguity Suppression in the LT-1 Mission via Sequential Convex Optimizations

Cited by 12 publications

References 37 publications

A Novel Weighted Amplitude Modulation (WAM) System for Ambiguity Suppression of Spaceborne Hybrid Quad-Pol SAR

A Novel Weighted Amplitude Modulation (WAM) System for Ambiguity Suppression of Spaceborne Hybrid Quad-Pol SAR

Removal of Range Ambiguity in SAR Images Based on Blind Separation Method

A Joint Azimuth Multichannel Cancellation (JAMC) Antibarrage Jamming Scheme for Spaceborne SAR

Contact Info

Product

Resources

About