A Squint TOPSAR Imaging Algorithm Based on Extend Azimuth Non-linear Chirp Scaling

JIANG Huai; ZHAO Huichang; HAN Min; ZHANG Shuning

doi:10.11999/JEIT160933

Volume 39 Issue 7

Jul. 2017

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Article Navigation > Journal of Electronics & Information Technology > 2017 > 39(7): 1606-1611

JIANG Huai, ZHAO Huichang, HAN Min, ZHANG Shuning. A Squint TOPSAR Imaging Algorithm Based on Extend Azimuth Non-linear Chirp Scaling[J]. Journal of Electronics & Information Technology, 2017, 39(7): 1606-1611. doi: 10.11999/JEIT160933

Citation:

JIANG Huai, ZHAO Huichang, HAN Min, ZHANG Shuning. A Squint TOPSAR Imaging Algorithm Based on Extend Azimuth Non-linear Chirp Scaling[J]. Journal of Electronics & Information Technology, 2017, 39(7): 1606-1611. doi: 10.11999/JEIT160933

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A Squint TOPSAR Imaging Algorithm Based on Extend Azimuth Non-linear Chirp Scaling

doi: 10.11999/JEIT160933

1.
(School of Electronic &
2.
(State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210094, China)

Funds:

The National Natural Science Foundation of China (61301216)

Received Date: 2016-09-19
Rev Recd Date: 2016-11-10
Publish Date: 2017-07-19

Abstract

Abstract

In the squint Terrain Observation by Progressive scabs (TOPSAR) mode, the different azimuth scatters have different Doppler center frequencies, which causes azimuth under-sampling problem and increase the coupling between range and azimuth. Considering at the characteristics of squint TOPSAR echo, this article proposes a new full aperture imaging algorithm: first, the azimuth signal aliasing is removed by introducing the nonlinear walk correction; second, the nonlinear chirp scaling algorithm for azimuth focusing is applied to compensating the Doppler modulation rate; finally, the image geometric distortion is eliminated by 2-D chirp scaling operation. Compared with the traditional algorithm, the proposed algorithm avoids the interpolation under the case of extending a small amount of data, hence the calculation needed is less. The simulation results prove the effectiveness of the algorithm.
- Squint TOPSAR,
- Non-linear chirp scaling,
- Chirp scaling,
- Image geometric distortion

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References(21)

References

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