| 超宽带SAR数字正交解调器设计 |
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| 引用本文： | 张炳煌,雷宏. 超宽带SAR数字正交解调器设计[J]. 电子测量技术, 2006, 29(6): 36-39 |
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| 作者姓名： | 张炳煌 雷宏 |
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| 作者单位： | 中国科学院电子学研究所,北京,100080;中国科学院研究生院,北京,100083;中国科学院电子学研究所,北京,100080 |
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| 摘 要： | 超宽带正交解调器是高分辨率合成孔径雷达(SAR)系统的关键部件之一,其性能直接影响到成像的效果,而数字方法能在一定程度上降低误差。本文给出了1种超宽带数字正交解调器的设计方法,选择采样频率为四倍带宽,节省了2个高速乘法器的开销;采用线性规划理论中单纯形方法优化设计双滤波器通道的系数,得到很好的脉冲压缩效果。并给出了硬件设计方案,使用FPGA实现高速并行滤波。该数字正交解调器能很好地应用于高分辨率SAR系统。
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| 关 键 词： | 合成孔径雷达 正交解调 单纯形法 匹配滤波 |
Ultra-wide band quadrature demodulator design |
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| Zhang Binghuang,Lei Hong. Ultra-wide band quadrature demodulator design[J]. Electronic Measurement Technology, 2006, 29(6): 36-39 |
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| Authors: | Zhang Binghuang Lei Hong |
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| Affiliation: | 1. Institute of Electronics, Chinese Academy of Science, Beijing 100080; 2. Graduate University of the Chinese Academy of Science, Beijing 100083 |
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| Abstract: | Ultra-wide band quadrature demodulator is the key device of the SAR system, its performance affects SAR image directly. Compared with analog method, digital method can degrade the error. This paper offered a kind of digital I/Q demodulator, choosing 4B as sampling frequency, saved two high speed multiplications. FIR filter is designed through simplex algorithm, received good impulse compressing result. This paper also offered hardware design method. The result improved that this device can be well applied in the high-resolution SAR system. |
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| Keywords: | SAR I/Q demodulator simplex alg orithm matching filter |
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