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Research on compensation of motion, Earth curvature and tropospheric delay in GEOSAR

机译：GEOSAR运动，地球曲率和对流层延迟的补偿研究

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摘要

GEOSAR (synthetic aperture radar on geosynchronous satellite) becomes a potential method of space-borne geoscience remote sensing. Though it has attractive characters such as extra long observing time and very large observing area the unique geometry and relative motion are quite different from straight line required by SAR, and long integration time also causes delay by troposphere and ionosphere. Curvature of the Earth is no long negligible in GEOSAR. Especially, principle of azimuth compression in GEOSAR should be different from that of traditional SAR. In order to fulfill practical GEOSAR such problems should be solved. A new solution of azimuth compression together with motion compensation is presented here by taking the advantages of GEOSAR movement. A new method to overcome the Earth curvature in range compression of EACH footprint is testified. After compensating the Earth curvature traditional methods for range cell migration correction can be used in GEOSAR. Multi-sub-aperture method is applied to eliminate the phase delay caused by troposphere. This modified imaging algorithm makes it possible for GEOSAR to have long integration time and high resolution.
机译：GEOSAR（地球同步卫星上的合成孔径雷达）成为星载地球科学遥感的一种潜在方法。尽管具有吸引人的特点，如超长的观测时间和非常大的观测面积，但其独特的几何形状和相对运动与SAR所需的直线截然不同，并且积分时间过长还会导致对流层和电离层的延迟。在GEOSAR中，地球的曲率不再是微不足道的。特别是，GEOSAR中的方位角压缩原理应与传统SAR不同。为了满足实际的GEOSAR，应该解决这些问题。本文利用GEOSAR运动的优势，提出了一种方位压缩和运动补偿的新解决方案。验证了一种克服EACH足迹范围压缩中的地球曲率的新方法。在补偿了地球曲率之后，可以在GEOSAR中使用传统的用于距离单元偏移校正的方法。应用多子孔径方法消除对流层引起的相位延迟。这种改进的成像算法使GEOSAR具有较长的积分时间和高分辨率。

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