Influence of Radar Targets on the Accuracy of FMCW Radar Distance Measurements

被引：35

作者：

Scherr, Steffen ^{[1
]}

Afroz, Rifat ^{[1
]}

Ayhan, Serdal ^{[1
]}

Thomas, Sven ^{[2
]}

Jaeschke, Timo ^{[3
]}

Marahrens, Soren ^{[1
]}

Bhutani, Akanksha ^{[1
]}

Pauli, Mario ^{[1
]}

Pohl, Nils ^{[3
]}

Zwick, Thomas ^{[1
]}

机构：

[1] Karlsruhe Inst Technol, Inst Radio Frequency Engn & Elect, D-76131 Karlsruhe, Germany

[2] Fraunhofer Inst High Frequency Phys & Radar Tech, D-53343 Wachtberg, Germany

[3] Ruhr Univ Bochum, Inst Integrated Syst, D-44801 Bochum, Germany

来源：

IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES | 2017年 / 65卷 / 10期

关键词：

Frequency-modulated continuous; wave (FMCW) radar; high accuracy; range detection; PHASE EVALUATION; SENSOR; SYSTEM; WAVE;

D O I：

10.1109/TMTT.2017.2741961

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Distance measurement tasks in micromachine tools need to be performed with micrometer accuracy. For such tasks, frequency-modulated continuous-wave (FMCW) radars with a combination of frequency and phase evaluations are a good choice. However, the accuracy cannot be indefinitely increased as there are constraints on the target size and placement imposed by the limited space inside micromachines. This paper investigates the influence of target geometry and position on the accuracy of its range estimation using a W-band FMCW radar with a bandwidth of 25 GHz. A relation between target geometry and accuracy is established through the Cramr-Rao lower bound (CRLB). Based on the measurements of different targets, an optimal shape and size is proposed, which provides an average accuracy in the single digit micrometer range. Furthermore, the influence of different bandwidths on the accuracy is investigated. It is also demonstrated how the CRLB can be used to optimize the size of a target, when a certain accuracy is needed. In addition, antenna field regions are analyzed for suitable target placements. Finally, the radar system is implemented in a machine tool and measurements with accuracies in the micrometer range are carried out.

引用

页码：3640 / 3647

页数：8

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