Phase Noise in FMCW Radar Systems
Phase Noise in FMCW Radar Systems
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DOI：
10.1109/taes.2018.2847999
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发表时间：
2019-02-01
影响因子：
4.4
通讯作者：
Watson, Robert J.
中科院分区：
文献类型：
--
作者：
Siddiq, Kashif;Hobden, Mervyn K.;Watson, Robert J.
相位噪声是现代雷达、通信、光谱和光电系统的基本性能参数之一。本文建立了FMCW雷达系统的相位噪声理论。本文导出了一个新的设计方程，用以确定雷达系统中允许源相位噪声电平的最大界。由于相干混频的非线性相位噪声去相关函数已被分析的传播延迟小于参考振荡器的相干时间，和目标响应的谱展宽的延迟时间大于相干时间进行了讨论。介绍了收发器链中各子系统的影响，并讨论了ADC中相位噪声的新模型。相位噪声建模技术，其次是一个PLL频率合成器与低噪声频率合成器的比较，以证明减少相位噪声边带，提高检测和跟踪性能。两个毫米波FMCW雷达系统利用两个频率合成器的实际测量已被提出来验证所开发的理论。
Phase noise is one of the fundamental performance parameters in modern radar, communication, spectroscopic, and metrological systems. In this paper, a phase noise theory has been developed for FMCW radar systems. A new design equation has been derived to specify the maximum bound on the allowable source phase noise level in radar systems. The nonlinear phase noise decorrelation function due to coherent mixing has been analyzed for propagation delays less than the coherence time of the reference oscillator, and the spectral broadening of target responses has been discussed for delay times greater than the coherence time. The effects of the subsystems in the transceiver chain are presented and a new model of phase noise in ADCs is discussed. Phase noise modeling techniques are presented, followed by a comparison of a PLL frequency synthesizer with a low-noise frequency synthesizer to demonstrate the reduction of phase noise sidebands for improved detection and tracking performance. Practical measurements from two millimeter wave FMCW radar systems utilizing the two frequency synthesizers have been presented to validate the developed theory.