多波形射频功率测量技术

RF Power Measurement Technology for Multi-Waveforms

功率检波是测量射频信号功率的常用手段之一,采用对数检波的方式对某平台的多种射频信号进行功率测量,满足复杂条件下的装备地面检测和检修的需求。分析了对数检波的工作原理,对3种检波器进行了性能比较,并以对数检波器为基础进行了系统论证、电路设计和软件设计,分析了误差的来源,并对误差进行了校准,通过试验验证了设计的有效性。多波形检测时,不同的调制波形会产生不同的检波信号,需要进行相应的处理。校准是保证测量精度的必要手段,也是设备的软硬件设计和调试重点,通过标准信号源以频率、功率、波形和温度为参数进行组合校准。设备可在-40~65℃的环境温度下达到±2 dB的测量精度,具有环境适应性强、测试精度高的特点。

Power detection is one of the common means to measure the power of RF signal.Logarithmic detection method is used to measure a variety of RF signals of a weapon platform to meet the needs of equipment ground detection and maintenance under complex conditions.The working principle of logarithmic detection is analyzed, the performance of three power detectors is compared.The system demonstration, circuit design and software design based on logarithmic detector are carried out, the error source is analyzed and the error is calibrated, and the effectiveness of the design is verified through experiments.During multi-waveforms detection, different modulation waveforms will produce different detection signals, which need to be processed accordingly.Calibration is not only a necessary means to ensure the measurement accuracy, but also the key point of hardware and software design and debugging.The standard signal source is used to carry out calibration with combined frequency, power, waveform and temperature as parameters.The equipment can achieve the measurement accuracy of ±2 dB under the ambient temperature of-40~65 ℃ and has the characteristics of strong environmental adaptability and high measurement accuracy.