Determination of Sweep Linearity Requirements in FMCW Radar Systems Based on Simple Voltage-Controlled Oscillator Sources
Determination of Sweep Linearity Requirements in FMCW Radar Systems Based on Simple Voltage-Controlled Oscillator Sources
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DOI：
10.1109/taes.2011.5937252
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发表时间：
2011-07-01
影响因子：
4.4
通讯作者：
Chetty, K.
中科院分区：
文献类型：
--
作者：
Brennan, P. V.;Huang, Y.;Chetty, K.
线性调频（FM）或线性调频脉冲压缩是一种广泛使用的技术，用于提高雷达系统的距离分辨率，尽管它往往对FM扫描线性度提出相当严格的要求。本文研究了扫描非线性对调频连续波（FMCW）雷达系统性能的影响，特别是那些采用简单的压控振荡器（VCO）源，使用一种新的和简单的方法的基础上的分数斜率变化（FSV）。模拟结果，假设一个平方律源非线性表示，显示点目标响应和距离分辨率的非线性效应。然后将这些结果与线性的标准定义相关联。最后，从商业VCO的测量结果令人信服地验证了工作，从而在一个简单而实用的方法来预测源的非线性的影响，定义的FSV参数，对FMCW雷达系统的性能。
Linear frequency modulated (FM), or chirp, pulse compression is a widely used technique for improving the range resolution of radar systems, although it often places quite stringent demands on FM sweep linearity. This paper examines the impact of sweep nonlinearities on the performance of frequency modulated continuous wave (FMCW) radar systems, particularly those employing simple voltage-controlled oscillator (VCO) sources, using a new and straightforward approach based on the fractional slope variation (FSV). Modeled results are presented, assuming a square-law source nonlinearity representation, showing the effect of such nonlinearities on point-target response and range resolution. These results are then related to the standard definition of linearity. Measurements from a commercial VCO are finally used to convincingly validate the work, resulting in a simple and practical method to predict the impact of source nonlinearity, as defined by the FSV parameter, on the performance of an FMCW radar system.