摘要
对工作于近地条件的谐波探测系统,自由空间假设下导出的谐波雷达方程已经不足以预测和解释观测过程中的诸多现象,故本文基于目标特性和环境因素研究了这类系统的修正传播模型.一是引入目标谐波特性修正,使得接收谐波随距离的衰减率更加符合实际测量;二是引入基波和谐波的多径效应分析,使得模型具备预测和解释近地观测的接收功率振荡现象.此外进行仿真分析并搭设了测量系统,设计了室内近程和室外长程的实测实验,验证了传播模型所预测的探测盲区现象,并提出了对其加以缓解和利用的思路构想,对近地谐波探测系统设计和性能评估具有积极意义.
For harmonic detection systems working in near-earth conditions,the harmonic radar equation derived under the free space hypothesis is not enough to predict and explain many phenomena in the measurement,so this paper studies the modified propagation model for such systems based on the characteristics of the target and environmental factors.The target harmonic characteristic is introduced in the propagation model,which makes the harmonic attenuation rate more in line with the actual measurement.Besides,the multi-path effect analysis of fundamental and harmonic signals allows the model to predict and explain the receiving power strength oscillation at a certain distance.In addition,simulations are conducted and measurement systems are set up.Indoor near-range and outdoor long-range experiments are designed to verify the predicted detection blind spot by the model.The proposed model has great significance for the design and performance evaluation of near-ground harmonic detection systems.
作者
李远哲
胡卫东
范红旗
杜小勇
LI Yuanzhe;HU Weidong;FAN Hongqi;DU Xiaoyong(National Key Laboratory of Science and Technology on Automatic Target Recognition,National University of Defense Technology,Changsha 410073,China)
出处
《电波科学学报》
CSCD
北大核心
2022年第6期1025-1031,共7页
Chinese Journal of Radio Science
关键词
谐波探测
谐波雷达方程
非线性探测
传播模型
多径效应
harmonics detection
harmonic radar equation
nonlinear detection
propagation model
multipath effects
