Sub retrograde geosynchronous orbit SAR: parameter design and performance analysis

Abstract

In recent years, Geosynchronous synthetic aperture radar (GEO SAR) has attracted many scientists to carry out relevant research. Its research is in-depth and gradually maturing. However, conventional GEO SAR has the problems of great influence by the earth's rotation, complex timing design, uneven flight speed in the whole orbit, and non orthogonal range and azimuth resolution, which limits it's application. A new concept of sub retrograde geosynchronous orbit SAR is proposed in this paper. Compared with traditional GEO SAR, the satellite has the advantages of less influence by the earth's rotation, simple timing, uniform motion speed in the whole orbit, shorter revisit time, better resolution and small space-variant in azimuth and range. The radar parameters of sub retrograde GEO SAR are designed. Through the research, it is found that the system sensitivity and resolution no longer change with the orbit position, and its timing design does not need to consider the range migration variation. In addition, the imaging characteristics of sub retrograde GEOSAR are investigated. The results show that, the range model can meet the imaging requirements as long as it is expanded to the fourth order. After that, the influence of orbit perturbation error in sub retrograde GEO SAR is given for the first time. Last, two ways to solve observation blind area of sub retrograde GEO SAR are proposed, one is to change the orbit inclination, another way is to use the bistatic mode. Index Terms-sub retrograde orbit, geosynchronous synthetic aperture radar (GEO SAR), system parameter design, performance analysis. I. INTRODUCTION INCE geosynchronous orbit synthetic aperture radar (GEO SAR) was proposed, it has attracted the attention of many researchers because of its short revisit period and wide observation swath. Scientists from the United States, China, Britain, Germany, Italy and other countries have carried out research on system design and imaging algorithms. In 1978, K. Tomiyasu first proposed the concept of GEO SAR [1], with the support of National Aeronautics and Space Administration (NASA), the parameter analysis of GEO SAR Manuscript received xx; revised xx ; accepted xx. Date of publication xx; date of current version xx.