论文部分内容阅读
为实现UWB雷达中的高速数据采集，本文从理论上探讨了中频／射频直接采样和数字正交技术对大带宽信号（≥10MHz）进行相干检波的可行性。对三种数字正交途径进行的计算机仿真表明：正交双路的幅相一致性大大提高了，当信号带宽≤20MHz时，镜频抑制效果优于传统模拟方式（＜－30dB）。
In order to realize high-speed data acquisition in UWB radar, the feasibility of coherent detection of large bandwidth signal (≥10MHz) by IF / RF direct sampling and digital orthogonal technique is discussed theoretically. The computer simulation of three digital orthogonal paths shows that the amplitude and phase consistency of the orthogonal two-way is greatly improved, and the image rejection effect is better than the traditional analog mode (<-30dB) when the signal bandwidth is less than or equal to 20MHz.