A Channel Phase Error Correction Method Based on Joint Quality Function of GF-3 SAR Dual-Channel Images.

Guangcai Sun,Liang Guo,Jun Yang,Jixiang Xiang,Mengdao Xing

doi:10.3390/s18093131

Abstract

Multichannel SAR is an effective approach to solving the contradiction between high azimuth resolution and wide swath. The goal of this paper is to obtain a new and effective method for estimating and compensating the interchannel phase error of the Chinese GF-3 Synthetic aperture radar (SAR). A channel phase error correction method based on the optimal value of the image domain quality function is proposed. In this method, the phase error is initially compensated using the correlation function method. In the fine correction of dual-channel phase error, a heuristic search algorithm is used to estimate the residual phase by searching the extremum of the quality function. After phase compensation in the image domain, the azimuth ambiguities caused by the remaining phase are eliminated. The proposed image domain processing method provides a new idea for channel phase error correction. The measured data of high-resolution GF-3 dual-channel ultrafine imaging mode verifies the validity of this method.

Highlights

Synthetic aperture radar (SAR) [1] is a high-resolution imaging radar that can use a wide-band signal and a long synthesis array to obtain a clear two-dimensional image of the observed area.Due to its high space orbit, the space-borne SAR platform is not affected by ground weather and national borders
GF-3 is a high-performance sensor, the processing of GF-3 data has become a hot topic in recent research
This paper introduces a method of hill-climbing algorithm (HCA) [26,27], which is a kind of heuristic searching algorithm

Summary

Introduction

Synthetic aperture radar (SAR) [1] is a high-resolution imaging radar that can use a wide-band signal and a long synthesis array to obtain a clear two-dimensional image of the observed area. Due to its high space orbit, the space-borne SAR platform is not affected by ground weather and national borders. It has the advantages of large coverage [2,3], remote monitoring of moving targets [4], and strong antidestruction capability [5]. SAR, space-borne SAR has become a hot spot for research and development in various countries. GF-3 is a high-performance sensor, the processing of GF-3 data has become a hot topic in recent research

Objectives

Methods

Conclusion