Transmitter noise considerations in super-Nyquist FMCW radar design
Transmitter noise considerations in super-Nyquist FMCW radar design
复制标题
DOI：
10.1049/el.2014.4236
复制
发表时间：
2015-03-05
影响因子：
1.1
通讯作者：
Brennan, P. V.
中科院分区：
文献类型：
--
作者：
Ash, M.;Brennan, P. V.
针对超奈奎斯特调频连续波（FMCW）雷达系统，提出了一种与发射机到接收机噪声泄漏有关的设计考虑。相位噪声曲线比较的基本直接数字频率合成器的频率和其第二超奈奎斯特图像显示了显着增加的相对噪声电平在所有偏移的载波。这导致发射机信噪比降低。它示出了一个简单的例子，这可能会导致接收器的灵敏度显着下降，如果管理不当。雷达设计人员可以使用的经验法则，以避免或减轻这个问题。
A design consideration for super-Nyquist frequency modulated continuous-wave (FMCW) radar systems relating to transmitter to receiver noise leakage is introduced. Phase noise curves comparing the fundamental direct digital synthesisers frequency and its second super-Nyquist image show a significant increase in relative noise level at all offsets from the carrier. This results in a reduced transmitter signal-to-noise ratio. It is shown with a simple example that this can lead to a significant degradation in receiver sensitivity if not managed properly. A design rule-of-thumb that can be used by radar designers to avoid or mitigate this problem is provided.