线性调频脉冲辐射场频域测量方法

Measurement Method for Linear Frequency Modulation Pulsed Radiation Fields in Frequency Domain

针对当前缺乏线性调频脉冲辐射场频域测量技术的现状,分别提出了峰值检波、均方值根值检波下的测量和修正方法。首先,分别定义了两种检波方式下峰值场强修正系数,通过线性调频脉冲信号的功率推导和频域测量过程理论分析,完成了峰值场强修正系数的表征;然后,提出并采用电压因子和功率因子求解出峰值场强修正系数,从而实现了测量修正,并给出了测量参数的优选方法;最后,开展了实验验证。结果表明:提出的测量技术能够获得线性调频脉冲辐射场的频谱分布、峰值场强和平均值场强,并且突破了分辨率带宽的制约,场强测量绝对偏差不大于1 dB,证明测量方法有效可行,解决了频域准确测量线性调频脉冲辐射场的难题。

Since there is no measurement technologies for linear frequency modulation(LFM)pulsed radiation fields,the measurement methods are proposed respectively based on peak detection and root mean square detection in frequency domain with their corrections put forward correspondingly.Firstly,the correction coefficients of peak field strength for two detection modes are defined.The characterization of correction coefficients are established by the derivation of the power expressions and the theoretical analysis of the measurement process in frequency domain.Then the voltage factor and power factor are defined to work out the correction coefficients of peak field strength,so as to complete the correction.The optimization methods of measurement parameters are also given.Finally,the experimental verification is carried out.The results show that the proposed measurement methods can obtain the spectrum distribution,peak field strength and average field strength of LFM pulsed radiation field without the limitation of the resolution bandwidth.The absolute deviation is not greater than 1 dB.It indicates that the measurement methods are effective and feasible.The problem difficult to accurately measure LFM pulsed radiation fields in frequency domain has been addressed.