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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Nearly Zero Inclination Geosynchronous SAR Mission Analysis With Long Integration Time for Earth Observation
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Nearly Zero Inclination Geosynchronous SAR Mission Analysis With Long Integration Time for Earth Observation

机译：接近地球观测的积分时间较长的近零倾角地球同步SAR任务分析

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摘要

In this paper, the performance of a nearly zero inclination and low eccentricity geosynchronous synthetic aperture radar (GEOSAR) mission for midlatitude (30 $^{circ}$–60 $^{circ}$) Earth observation is analyzed. The slow motion of such satellites with respect to the Earth's surface makes it necessary to consider long coherent combination of pulses during hours to reach the desired along-track resolution. A system based on moderate transmitted powers and antenna sizes is considered. The necessary sensitivity in such GEOSAR system is obtained from the accumulated energy of the raw data using a pulse repetition frequency above the Doppler bandwidth and a long integration time. Several issues as a result of the long acquisition, such as target and atmospheric phase screen decorrelation, speckle noise impact on the received signal, and satellite station-keeping requirements, are analyzed. The feasibility of such systems to be placed on a broadcasting communication satellite makes nearly zero inclination GEOSAR a low-cost alternative of current SAR missions.
机译：在本文中，分析了近零倾角和低偏心率地球同步合成孔径雷达（GEOSAR）任务在中纬度（30 $ ^ $ 60– $ 60）的性能。此类卫星相对于地球表面的缓慢运动使得有必要考虑数小时内脉冲的长相干组合，以达到所需的沿轨道分辨率。考虑基于中等发射功率和天线尺寸的系统。使用高于多普勒带宽的脉冲重复频率和较长的积分时间，可以从原始数据的累积能量中获得此类GEOSAR系统中必要的灵敏度。经过长时间的采集，分析了几个问题，例如目标和大气相位屏幕的去相关，散斑噪声对接收信号的影响以及卫星站的保持要求。将这种系统安装在广播通信卫星上的可行性使近地零倾角GEOSAR成为当前SAR任务的低成本替代方案。

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