节点本振误差对分布式发射波束形成性能的影响  

Influence of Node Local Oscillator Errors on Distributed Transmit Beamforming

作　　者：袁丁 孙慧贤 闫云斌 全厚德 YUAN Ding;SUN Huixian;YAN Yunhin;QUAN Houde(Department of Electronic and Optical Engineering,Army Engineering University,Shijiazhuang 050003,China;Department of UVA Engineering,Army Engineering University,Shijiazhuang 050003,China)

机构地区：[1]陆军工程大学电子与光学工程系,石家庄050003 [2]陆军工程大学无人机工程系,石家庄050003

出　　处：《上海交通大学学报》2020年第1期92-99,共8页Journal of Shanghai Jiaotong University

基　　金：河北省自然科学基金资助项目(F2017506006)

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.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.

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 

分 类 号：TN92[电子电信—通信与信息系统]