毫米波宽带调频连续波信号的全波形计量校准技术研究

Full Waveform Calibration Technique for Millimeter-Wave Wideband FMCW Signals

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。

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 frequencydomain 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.