在某相位编码毫米波雷达系统中，要求很高的目标速度测量精度，因而目标多普勒频率测量电路的设计比较重要。
The design of target doppler frequency measurement circuit is very important in phase coded MMW radar system because of the high measurement precision requirement of target speed.
在某相位编码毫米波雷达系统中，由于对目标速度测量精度的要求很高，因此目标多普勒频率测量电路的设计也具有比较重要的地位。
The design of target Doppler frequency measurement circuit is very important in phase-coded MMW radar system because of the high measurement precision requirement of target speed.
在比较了以往采用的接触网导线高度检测技术后，开发出基于激光相位测距原理的接触网导线高度检测系统。
After having compared with common-used technique in contact wire height measurement, this paper describes a laser phase-detecting method to measure the height of contact wire.
本发明公开了一种基于干涉相位比较法的高精度绝对距离测量系统，属于精密测量技术领域。
The invention discloses a high-precision absolute distance measurement system based on an interferometric phase comparison method, belonging to the technical field of precision measurement.
详细阐述了系统工作设计思想与工作原理，并对其中的关键技术黑白条形码编码方式、相位比较模块与系统控制程序等进行了详细分析。
The design concept and working principle of the system are discussed, and the key technologies including black-white bar coding, phase comparison modules and system control program are analyzed.
然而，OFDM系统对频率偏差和相位噪声比较敏感。
However, OFDM is sensitive to frequency offset and phase noise.
然而，OFDM系统对频率偏差和相位噪声比较敏感。
However, OFDM is sensitive to frequency offset and phase noise.
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