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脉冲压缩定点处理的量化噪声分析

Keywords: 合成孔径雷达,脉冲压缩,有限字长,量化误差

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Abstract:

针对合成孔径雷达成像算法的定点化处理,提出了数字脉冲压缩定点化处理量化噪声的数学模型,采用线性时不变系统的性质计算脉冲压缩定点运算的量化误差.给出了该模块的舍入量化噪声详细分析过程,并推导出系统输出噪信比与系统字长、FFT长度等参数之间的关系.对获取的回波数据采用不同的系统字长进行成像,仿真结果很好地证明了所述理论的正确性.这样可根据理论结果选择合适的位长,用定点处理代替浮点运算处理减少运算的复杂度及资源的占用.

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