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Open AccessArticle

Focusing Arc-Array Bistatic Synthetic Aperture Radar Data Based on Keystone Transform

by Pingping Huang 1,2,*, Kai Li 1,2, Wei Xu 1,2,*, Weixian Tan 1,2, Zhiqi Gao 1,2 and Yachao Li 3
1
College of Information Engineering, Inner Mongolia University of Technology, Hohhot, 010051, China
2
Inner Mongolia Key Laboratory of Radar Technology and Application, Hohhot, 010051, China
3
National Lab of Radar Signal Processing, Xi’an, 710000, China
*
Authors to whom correspondence should be addressed.
Electronics 2019, 8(12), 1389; https://doi.org/10.3390/electronics8121389
Received: 13 October 2019 / Revised: 10 November 2019 / Accepted: 19 November 2019 / Published: 21 November 2019
(This article belongs to the Section Microwave and Wireless Communications)
Arc-array synthetic aperture radar (AA-SAR) has become a novel imaging scheme for full azimuth observation. However, the exiting arc-array monostatic SAR system is placed on a single platform and is easy to detect. Arc-array bistatic SAR (AA-BiSAR) with a stationary transmitter is proposed in this paper, which can obtain high data acquisition efficiency and reduce vulnerability of arc-array monostatic SAR. Furthermore, since the azimuth resolution with full azimuth observation is not related to the location of the stationary transmitter, the transmitter can be placed far away from the receiver. Compared with imaging algorithms for other modes, the key points of AA-BiSAR imaging algorithms are a square root in the bistatic slant range equation and an arc synthetic array in azimuth. According to the imaging geometry of AA-BiSAR, a novel imaging approach for AA-BiSAR based on keystone transform (KT) is proposed, and the KT implements range-cell migration correction (RCMC) in conditions of trigonometric function under square root in the range history and arc synthetic array in azimuth via reformatting the AA-BiSAR raw data. Besides presenting the proposed imaging approach, a complete resolution analysis of AA-BiSAR is given. Results of numerical simulation experiments on point targets validate the proposed imaging approach.
Keywords: bistatic radar; synthetic aperture radar; arc antenna array; wide angle view imaging keystone transform; range cell migration correction (RCMC) bistatic radar; synthetic aperture radar; arc antenna array; wide angle view imaging keystone transform; range cell migration correction (RCMC)
MDPI and ACS Style

Huang, P.; Li, K.; Xu, W.; Tan, W.; Gao, Z.; Li, Y. Focusing Arc-Array Bistatic Synthetic Aperture Radar Data Based on Keystone Transform. Electronics 2019, 8, 1389.

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