An Imaging Algorithm for Diving Highly Squinted SAR Based on Three-Dimensional Equidistant Sphere Analytical Model

Hua ZHONG; Mengyuan WANG; Huina SONG; Renchao BAI; Shiping LI; Jiayi CAO; Ronghua ZHAO

doi:10.11999/JEIT200650

Volume 43 Issue 3

Mar. 2021

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Article Navigation > Journal of Electronics & Information Technology > 2021 > 43(3): 657-664

Hua ZHONG, Mengyuan WANG, Huina SONG, Renchao BAI, Shiping LI, Jiayi CAO, Ronghua ZHAO. An Imaging Algorithm for Diving Highly Squinted SAR Based on Three-Dimensional Equidistant Sphere Analytical Model[J]. Journal of Electronics & Information Technology, 2021, 43(3): 657-664. doi: 10.11999/JEIT200650

Citation:

Hua ZHONG, Mengyuan WANG, Huina SONG, Renchao BAI, Shiping LI, Jiayi CAO, Ronghua ZHAO. An Imaging Algorithm for Diving Highly Squinted SAR Based on Three-Dimensional Equidistant Sphere Analytical Model[J]. Journal of Electronics & Information Technology, 2021, 43(3): 657-664. doi: 10.11999/JEIT200650

Citation:

Hua ZHONG, Mengyuan WANG, Huina SONG, Renchao BAI, Shiping LI, Jiayi CAO, Ronghua ZHAO. An Imaging Algorithm for Diving Highly Squinted SAR Based on Three-Dimensional Equidistant Sphere Analytical Model[J]. Journal of Electronics & Information Technology, 2021, 43(3): 657-664. doi: 10.11999/JEIT200650

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An Imaging Algorithm for Diving Highly Squinted SAR Based on Three-Dimensional Equidistant Sphere Analytical Model

doi: 10.11999/JEIT200650

1.
School of Communication Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
2.
Air Force Department of Equipment, Beijing 100843, China

Funds: The National Natural Science Foundation of China(61301248), China Postdoctoral Science Foundation(2018M630589), Zhejiang Province Science and Technology Plan Project(LGG18F010009), The Science and Technology on Sonar Laboratory(6142109KF201807), Zhejiang Provincial Department of Education Research Projects(Y201942113)

Received Date: 2020-08-03
Rev Recd Date: 2020-12-10

Available Online: 2021-02-22

Publish Date: 2021-03-22

Abstract

Abstract

In the case of diving highly squinted Synthetic Aperture Radar (SAR), the existence of range-dependent squint angle, severe range-azimuth coupling, three-Dimensional (3-D) velocity and acceleration produces two-Dimensional (2-D) spatial-variant Range Cell Migration (RCM) and Doppler phases. To accommodate these issues, this paper constructs a 3-D equidistant sphere analytical model to precisely reveal the range-azimuth variant property of the echo. Based on the model, an azimuth-variant residual high-order RCM correction is proposed, and the Frequency Extended NonLinear Chirp Scaling (FENLCS) is rederived to equalize the azimuth-variant Doppler phases. These two methods integrated with SubAperture (SA) processing are adopted to address the aforementioned issues faced by diving highly squinted SAR. Theoretical analysis and simulation results validate that the proposed model is capable of describing the range-azimuth spatial-variance property of echo more precisely, and better imaging performance can be acquired by this algorithm.

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References(14)

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