【摘要】 介绍了直接数字波形合成(direct digital waveform synthesizer,DDWS)的误差来源,分析了DDWS结构中其数模转换器(DAC)信号重构机理,比较研究了DAC信号重构误差对输出信号脉冲压缩结果的影响。提出了一种针对DAC带来的信号辛格函数调制误差的数字化补偿算法,对中频30 MHz,带宽分别为40 MHz和20 MHz的超宽带低中频线性调频信号进行了实际补偿。实验结果表明该算法简单方便,能有效补偿DAC带来的波形调制误差。更多还原

【Abstract】 Direct digital waveform synthesizer(DDWS) is a digital method that the radar signal is generally generated.The error resource of DDWS is presented.The principle that signal is reconstructed in digital-to-analog converters(DAC) is analyzed in the DDWS structure.The reconstructed signal error of the DAC effecting on the signal pulse compression performance is compared.Moreover,a digital compensative algorithm of Sinc function modulated signal error of DAC is developed. The linear frequency modulated(LFM) signals with 30 MHz center frequency,(20 MHz) bandwidth and 40 MHz bandwidth are compensated,respectively.The experimental results show that the algorithm is simple and can compensate the modulated waveform error due to DAC signal reconstruction.更多还原