A Modified Range Doppler Algorithm for High-Squint SAR Data Imaging

Author:

Guo Yanan1ORCID,Wang Pengbo1,Men Zhirong1,Chen Jie1,Zhou Xinkai2,He Tao1,Cui Lei3

Affiliation:

1. School of Electronics and Information Engineering, Beihang University, Beijing 100191, China

2. Beijing Institute of Remote Sensing Equipment, Beijing 100191, China

3. Shanghai Institute of Satellite Engineering, Shanghai 201100, China

Abstract

The high-squint airborne Synthetic Aperture Radar (SAR) has the ability to detect the target area flexibly, and the detection swath is significantly increased compared with the side-looking SAR system. Therefore, it is of great significance to carry out research on high-precision imaging methods for high-squint airborne SAR. However, the high-squint SAR echoes have large Range Cell Migration (RCM), resulting in severe range–azimuth coupling and strong spatial variation. In this paper, a Modified Range Doppler Algorithm (MRDA) is proposed to cope with these effects introduced by the significant RCM in high-squint airborne SAR imaging. The bulk compensation preprocessing is first adopted to remove the considerable RCM and severe cross-coupling in a two-dimensional frequency domain. Then, Non-Linear Chirp Scaling (NLCS) in the range direction is utilized to equalize the range-variant chirp rate caused by the residual RCM and coupling and, therefore, the consistent range phase compensation can be fulfilled in range frequency domain. The modified correlation processing is executed to compensate the residual Doppler phase modulation, the residual RCM and the range-variant cubic phase modulation, which guarantees the characteristics of high efficiency and high precision. The simulations have demonstrated that the MRDA can focus the SAR echoes with large squint angles more effectively than the algorithms based on the Linear Range Walk Correction (LRWC) method.

Funder

National Natural Science Foundation of China

Innovation Fund Project of Shanghai Aerospace Science and Technology

Publisher

MDPI AG

Subject

General Earth and Planetary Sciences

Reference32 articles.

1. Curlander, J.C., and McDonough, R.N. (1991). Synthetic Aperture Radar: Systems and Signal Processing, Wiley.

2. Cumming, I.G., and Wong, F.H. (2005). Digital Processing of Synthetic Aperture Radar Data: Algorithms and Implementation, Artech House.

3. Synthetic aperture radars;Wiley;IEEE Trans. Aerosp. Electron. Syst.,1985

4. A tutorial on synthetic aperture radar;Moreira;IEEE Geosci. Remote Sens. Mag.,2013

5. Signal properties of spaceborne squint-mode SAR;Davidson;IEEE Trans. Geosci. Remote Sens.,2002

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