Radar Parameter Design for Geosynchronous SAR in Squint Mode and Elliptical Orbit
Radar Parameter Design for Geosynchronous SAR in Squint Mode and Elliptical Orbit
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斜视模式和椭圆轨道地球同步SAR雷达参数设计
DOI：
10.1109/jstars.2016.2570231
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发表时间：
2016-06
期刊：
影响因子：
--
通讯作者：
Teng Long
中科院分区：
文献类型：
--
作者：
Zegang Ding;Wei Yin;Tao Zeng;Teng Long
低倾斜椭圆轨道建议用于地球同步合成孔径雷达（GEO SAR）在中纬度绘制感兴趣的区域。然而，这种轨道的半径变化导致了时变的最低点干扰和被照区域的倾斜范围。这些因素缩短了特定脉冲重复间隔（PRI）的可用成像时间，甚至可能比所需的集成时间更短。此外，在GEO SAR中广泛使用的斜视模式带来了非正交和非均匀的地面分辨率，传统的距离和方位角分辨率无法完全描述这些分辨率。为了解决这些问题，首先证明了地面分辨率区域是一个椭圆，并利用分辨率椭圆的轴线长度来表示各个方向上的最差和最佳分辨率。研究了正交和均匀地面分辨率的条件，推导了分辨率相关参数的解析表达式。其次，分析了轨道半径变化对数据采集的影响，提出了一种连续PRI变化方法来延长可用成像时间。通过以一定的时间间隔改变PRI，采集窗口和发射干扰随光照区域的时变而变化，从而放松了发射干扰的约束。最后，通过计算机仿真验证了所提出的地面分辨率表达式和PRI连续变化方法。
Low-inclined elliptical orbits are recommended for geosynchronous synthetic aperture radar (GEO SAR) to map the regions of interest at middle latitudes. However, the radius variation of such orbit results in a time-variant nadir interference and slant range of illuminated regions. These factors shorten the available imaging time for a specific pulse repetition interval (PRI), which may be even shorter than the required integration time. Besides, the squint mode widely used in GEO SAR brings in the nonorthogonal and nonuniform ground resolution, which cannot be completely described by the traditional range and azimuth resolutions. To solve these problems, first, the ground resolution area is proved to be an ellipse, and the axis lengths of the resolution ellipse are used to present the worst and the best resolutions along various directions. Conditions for orthogonal and uniform ground resolutions are investigated, and analytical expressions of the resolution-related parameters are derived. Second, effects of the orbit radius variation on data acquisitions are analyzed, and a continuous PRI variation method is proposed to lengthen the available imaging time. By varying the PRI with a constant time interval, the acquisition window and transmit interference are changed with the time-variant illuminated region, which loosens the constraint of the transmit interference. Finally, the proposed ground resolution expressions and continuous PRI variation method are verified by computer simulations.
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DOI：
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发表时间：
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影响因子：
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DOI：
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