Autofocus correction of residual low-order and high-frequency phase error in synthetic aperture radar

Lu, Qianrong; Gao, Yesheng; Wang, Kaizhi; Liu, Xingzhao

doi:10.1117/1.jrs.11.035015

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Cited by 3 publications

(1 citation statement)

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“…For

l th

segment, we have the dechirped signal

\begin{matrix} right leftthickmathspace.5em \\ f_{l} (n, m) & = {s^{'}}_{l} (n, m) \cdot \exp (j \frac{2 v^{2}}{λ r} {()(, \frac{n - ()(, N_{L} - N_{normalP}) l}{PRF})}^{2}) \\ = A^{'} \cdot \exp (j ϕ_{n} (n, m) + j ϕ_{normale, l} (n, m_{0})) \cdot p_{r} (\frac{m}{f_{r}} - \frac{2 r}{c}), \end{matrix}

where

()(, N_{L} - N_{normalP}) l \leq n \leq ()(, N_{L} - N_{normalP}) l + N_{L} - 1

and

ϕ_{n} false(n, m false)

is the nominal phase. In [10],

ϕ_{normale} false(n, m_{0} false)

is decomposed by the inverse discrete‐cosine transform which is suitable to high‐frequency RAPE. In practice, taking the searching efficiency and flying rule into consideration, the polynomial model is preferred, which means

ϕ_{e, l} false(n, m_{0} false) ≃ {\hat{ϕ}}_{e, l} false(n, {bold-italicw}_{l}

…”

Section: Problem Descriptionmentioning

confidence: 99%

Improved entropy‐based autofocus correction for synthetic aperture radar

Huang

Gao

et al. 2019

J. eng.

Self Cite

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“…For

l th

segment, we have the dechirped signal

\begin{matrix} right leftthickmathspace.5em \\ f_{l} (n, m) & = {s^{'}}_{l} (n, m) \cdot \exp (j \frac{2 v^{2}}{λ r} {()(, \frac{n - ()(, N_{L} - N_{normalP}) l}{PRF})}^{2}) \\ = A^{'} \cdot \exp (j ϕ_{n} (n, m) + j ϕ_{normale, l} (n, m_{0})) \cdot p_{r} (\frac{m}{f_{r}} - \frac{2 r}{c}), \end{matrix}

where

()(, N_{L} - N_{normalP}) l \leq n \leq ()(, N_{L} - N_{normalP}) l + N_{L} - 1

and

ϕ_{n} false(n, m false)

is the nominal phase. In [10],

ϕ_{normale} false(n, m_{0} false)

ϕ_{e, l} false(n, m_{0} false) ≃ {\hat{ϕ}}_{e, l} false(n, {bold-italicw}_{l}

…”

Section: Problem Descriptionmentioning

confidence: 99%

Improved entropy‐based autofocus correction for synthetic aperture radar

Huang

Gao

et al. 2019

J. eng.

Self Cite

View full text Add to dashboard Cite

Study on Pointing Accuracy Effect on Image Quality of Space-borne Video SAR

Liang

Zhang

Zhao

et al. 2019

IOP Conf. Ser.: Mater. Sci. Eng.

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Space-variant motion compensation for synthetic aperture radar under complicated flight path

Huang

Gao

et al. 2018

J. Appl. Rem. Sens.

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Autofocus correction of residual low-order and high-frequency phase error in synthetic aperture radar

Cited by 3 publications

References 19 publications

Improved entropy‐based autofocus correction for synthetic aperture radar

Improved entropy‐based autofocus correction for synthetic aperture radar

Study on Pointing Accuracy Effect on Image Quality of Space-borne Video SAR

Space-variant motion compensation for synthetic aperture radar under complicated flight path

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