| 宽带雷达射频分时交替采样增益失配估计方法 |
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| 引用本文： | 张炜承,林钱强,陈曾平. 宽带雷达射频分时交替采样增益失配估计方法[J]. 国防科技大学学报, 2013, 35(4): 134-139 |
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| 作者姓名： | 张炜承 林钱强 陈曾平 |
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| 作者单位： | 国防科学技术大学ATR重点实验室,国防科学技术大学ATR重点实验室,国防科学技术大学ATR重点实验室 |
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| 基金项目： | 国家自然科学基金项目（No. 61002025） |
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| 摘 要： | 针对分时交替采样在宽带条件下存在增益起伏的失配问题,提出了基于最小二乘曲线拟合的增益曲线估计算法。基于实际ADC器件增益起伏的情况,分析了通道增益失配对系统输出信号频谱的影响;根据宽带数字阵列雷达回波信号的特点,利用分段估计与最小二乘曲线拟合方法得到增益估计曲线,给出了算法的实现步骤。仿真实验结果表明该算法在宽带分时交替采样中的有效性。
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| 关 键 词： | 宽带雷达 分时交替采样 频谱混叠 增益起伏 |
| 收稿时间： | 2013-06-15 |
| 修稿时间： | 2013-07-02 |
Gain mismatch estimation method for time-interleaved ADC system in wideband radar RF sampling |
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| ZHANG Weicheng,LIN Qianqiang and CHEN Zengping. Gain mismatch estimation method for time-interleaved ADC system in wideband radar RF sampling[J]. Journal of National University of Defense Technology, 2013, 35(4): 134-139 |
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| Authors: | ZHANG Weicheng LIN Qianqiang CHEN Zengping |
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| Affiliation: | ATR Key Laboratory, National University of Defense Technology, Changsha 410073, China;ATR Key Laboratory, National University of Defense Technology, Changsha 410073, China;ATR Key Laboratory, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | In order to resolve the gain mismatch issue for the Time-Interleaved ADC in wideband radar RF sampling, a gain estimation method based on least square curve fitting is proposed. Based on the gain fluctuation of ADC, the negative influence of gain mismatch on the output signal spectrum is analyzed. According to the characters of wideband DAR echo, the gain estimation curve is obtained. The concrete implementation steps of this estimation method are also presented. Experimental results prove the validity of the proposed method in wideband TIADC system. |
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| Keywords: | Wideband radar Time-Interleaved ADC Spectrum aliasing Gain fluctuation |
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