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电子学报  2015 

调频连续波SAR非线性误差的开环校正方法

DOI: 10.3969/j.issn.0372-2112.2015.03.021, PP. 550-556

Keywords: 调频连续波合成孔径雷达,压控振荡器,信号压缩,调频非线性,收敛准则

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Abstract:

针对FMCW(FrequencyModulatedContinuousWave)SAR(SyntheticApertureRadar)调频非线性误差对一维聚焦性能影响和该误差校正问题,该文引入VCO(VoltageControlledOscillator)调频非线性高阶误差模型,从理论推导、定量分析了调频非线性误差对信号的具体影响.在VCO工作稳定、随时间电漂移度较小的前提下,提出了一种基于开环的FMCWSAR非线性校正方法.该方法首先一次补偿谐波误差,以信号压缩指标性能最优为收敛准则,通过迭代来校正因输入电压的更新和VCO电漂移及热噪声而引起抖动的高阶误差,进而对信号的调频非线性进行校正.信号仿真和实测数据处理结果表明该方法能对FMCWSAR信号源的调频非线性误差进行稳健、有效的校正,并且与传统的开环软件校正方法相比,该方法无需构建复杂的误差模型,具有简单、经济、运算量较小等优点.

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