Full Waveform Calibration Technique for Millimeter-Wave Wideband FMCW Signals
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摘要: 为了更好地满足毫米波汽车雷达领域对调频连续波(FMCW)信号测试设备的校准需求,提升针对毫米波宽带复杂模拟调制信号的计量和测试能力,构建了频域全波形计量标准装置和被校FMCW测试设备的混合测量系统,利用二者对自定义毫米波FMCW信号的原位、同步测量,实现对商用仪表的校准和性能验证。在24 GHz和60 GHz典型毫米波雷达频段,充分对比了不同测量方法和设备的性能差异。实验结果表明,频域全波形计量方法优于相关商用仪器,在200 MHz窄带和2 GHz宽带条件下的线性调频偏差测量结果均小一个数量级,具备开展校准和性能验证的技术条件。Abstract: To address the calibration needs of Frequency Modulated Continuous Wave (FMCW) signal testing equipment in millimeter-wave automotive radar applications and enhance measurement capabilities for complex analog-modulated signals in millimeter-wave broadband, we developed a hybrid measurement system. This system combines a frequency-domain full waveform metrology setup with FMCW testing equipment under calibration. By conducting in-situ, synchronous measurements of custom millimeter-wave FMCW signals, we achieved calibration and performance verification of commercial instruments. We thoroughly compared the performance of different measurement methods and equipment in the typical millimeter-wave radar frequency bands of 24 GHz and 60 GHz. Experimental results demonstrate that the frequency-domain full waveform metrology method outperforms relevant commercial instruments. The FMCW chirp deviation measurements under both 200 MHz narrowband and 2 GHz wideband conditions were an order of magnitude more precise, meeting the technical requirements for calibration and performance verification.
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表 1 FMCW信号测量结果
Table 1. Measurement results of FMCW signals
调制方式 调频速率(MHz/μs) 最大频偏(MHz) 载波频率(GHz) 实测线性调频偏差(MHz) 频域 时域 VSA FMCW 125 ±100 24 0.4 2.2 4.2 1250 ± 1000 60 41.2 321 231 -
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