陆军工程大学 a. 电子与光学工程系； b. 无人机工程系， 石家庄 050003
出版日期:2020-01-28发布日期:2020-01-16通讯作者:全厚德，男，教授，博士生导师，电话(Tel.):0311-87994517; E-mail: qkevinxs@163.com.作者简介:袁丁(1990-)，男，山东省泰安市人，博士生，研究方向为指控装备通信效能增强技术.基金资助:河北省自然科学基金资助项目(F2017506006)Influence of Node Local Oscillator Errors on Distributed Transmit Beamforming
YUAN Ding a,SUN Huixian a,YAN Yunbin b,QUAN Houde aa. Department of Electronic and Optical Engineering； b. Department of UVA Engineering, Army Engineering University, Shijiazhuang 050003, China
Online:2020-01-28Published:2020-01-16摘要/Abstract
摘要： 采用核密度估计方法，对存在本振误差时的分布式发射波束形成(DTBF)性能进行统计分析.考虑存在载波初始相位偏移、载波频率偏移、相位噪声等3个偏差项，推导了对应的任意阵平均波束图和互补累积分布函数的理论表达式，并选用衰减因子和波束图特征参数分析本振误差对远场波束性能影响.理论分析和模拟结果显示，本振误差会导致DTBF性能出现衰减，并使合成波束图的平均主瓣水平下降，主瓣变宽，旁瓣区域扩展，波束图出现高旁瓣.随着时间的增长，本振误差累积增大，所致性能衰减增大，聚集到目标方位的能量减少.
关键词: 分布式发射波束形成(DTBF)； 本振误差； 核密度估计方法； 平均波束图； 互补累积分布函数
Abstract: Using the kernel density estimation method, a stochastic analysis of the performance of distributed transmit beamforming (DTBF) in the presence of node oscillator error is conducted. Considering carrier initial phase offset, carrier frequency offset and phase noise, the corresponding average beampattern and complementary cumulative distribution function are derived. Then the degradation factor and beampattern characteristic parameters are adopted to analyze the influence of local oscillator errors on far-field beam performance. Theoretical analysis and simulation results show that local oscillator error can result in the degradation of DTBF performance, the decrease of average main lobe level, the widening of main lobe, the expansion of sidelobe region, and the emergence of high beampattern sidelobe. Over time, the local oscillator error accumulates gradually, which makes the degradation become bigger and the energy focused on the target location become less.
Key words: distributed transmit beamforming (DTBF); local oscillator error; kernel estimation method; average beampattern; complementary cumulative distribution function
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