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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing. >Raw Signal Simulator for SAR With Trajectory Deviation Based on Spatial Spectrum Analysis
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Raw Signal Simulator for SAR With Trajectory Deviation Based on Spatial Spectrum Analysis

机译：基于空间谱分析的SAR轨迹偏差信号模拟器。

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摘要

This paper presents a whole new method for simulating a raw signal of synthetic aperture radar (SAR) with trajectory deviation. In this paper, a SAR raw signal is viewed as a spatial function in terms of radar location, at a fixed range frequency component of the radar signal. It is disclosed and verified that the SAR raw signals is band limited from the perspective of spatial spectrum analysis. Based on this finding, SAR raw signals under condition of trajectory deviation are obtained by interpolating the SAR raw signal along a set of ideally linear trajectories. The unprecedent performance achieved by the new method mainly includes the following. First, it provides a way to update existing simulators designed for ideally linear trajectory, giving them the capability to take trajectory deviation into consideration. Second, it is an efficient SAR raw signal simulator whose validity limit is greatly expanded compared with existing efficient simulators, as many constraints are eliminated without sacrificing computational efficiency or phase accuracy. Third, it is a uniform framework applicable for multiple SAR acquisition modes. Finally, the computational complexity of Monte Carlo experiment under various trajectory deviations is dramatically reduced, at the expense of storage memory requirement. Theoretical analyses are demonstrated by experimental results.
机译：本文提出了一种全新的合成孔径雷达合成孔径雷达信号仿真方法。在本文中，就雷达位置而言，在雷达信号的固定范围频率分量上，SAR原始信号被视为空间函数。从空间频谱分析的角度，公开并验证了SAR原始信号是频带受限的。基于此发现，通过沿一组理想线性轨迹内插SAR原始信号，可以得到轨迹偏离条件下的SAR原始信号。通过新方法实现的前所未有的性能主要包括以下方面。首先，它提供了一种方法来更新为理想的线性轨迹设计的现有模拟器，从而使它们能够考虑轨迹偏差。其次，它是一种高效的SAR原始信号模拟器，与现有的高效模拟器相比，其有效范围大大扩展了，因为在不牺牲计算效率或相位精度的情况下消除了许多限制。第三，它是适用于多种SAR采集模式的统一框架。最后，在各种轨迹偏差下的蒙特卡洛实验的计算复杂度被大大降低，以存储内存需求为代价。理论分析由实验结果证明。

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