A Modified Chirp Sequence Waveform for FMCW Radar

WANG Yuan-kai; XIAO Ze-long; XU Jian-zhong; WU Li

doi:10.3969/j.issn.0372-2112.2017.06.002

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A Modified Chirp Sequence Waveform for FMCW Radar

更新时间：2025-07-16

- A Modified Chirp Sequence Waveform for FMCW Radar
- Acta Electronica Sinica Vol. 45, Issue 6, Pages: 1288-1293(2017)
- 作者机构：
  
  南京理工大学电子工程与光电技术学院,江苏,南京,210094
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0372-2112.2017.06.002
  CLC： TN958.94
- Published Online：25 June 2017，
  
  Published：2017
- 稿件说明：
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WANG Yuan-kai, XIAO Ze-long, XU Jian-zhong, et al. A Modified Chirp Sequence Waveform for FMCW Radar[J]. Acta Electronica Sinica, 2017, 45(6): 1288-1293.
DOI：

WANG Yuan-kai, XIAO Ze-long, XU Jian-zhong, et al. A Modified Chirp Sequence Waveform for FMCW Radar[J]. Acta Electronica Sinica, 2017, 45(6): 1288-1293. DOI： 10.3969/j.issn.0372-2112.2017.06.002.

摘要

采用线性调频序列波形（chirp sequence waveform）的调频连续波（Frequency Modulated Continuous Wave，FMCW）雷达在汽车防撞探测等领域得到了广泛应用.针对该体制雷达的多目标解多普勒模糊问题，本文对线性调频序列波形进行了改进，在所有偶数序号扫频周期前插入了延时.改进后的波形可分解为两个扫频重复频率相同的传统调频序列，一个由奇数序号的扫频周期构成，另一个由偶数序号的扫频周期构成.波形中的延时会使两个序列对应的差频信号组之间产生相位差，利用此相位差信息可以解多普勒模糊.仿真结果验证了改进波形及其信号处理方法的多目标环境适应性和抗噪性.

Abstract

FMCW(Frequency Modulated Continuous Wave)radar with chirp sequence waveform is widely used in automotive applications.To resolve Doppler ambiguities in multi-target environment

we modify the classical chirp sequence waveform by adding a period of time delay before each chirp with even sequence number.The modified waveform is essentially a combination of two classical chirp sequences

one is composed of all the chirps with even sequence numbers

and the other one is composed of all the chirps with odd sequence numbers.The time delays in the modified waveform generate a phase difference between two beat signal groups corresponding to the two chirp sequences.Doppler ambiguities are resolved by the phase difference.Theoretical analysis and simulation results verify the effectiveness of the modified waveform.

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