摘要
针对目前欺骗式干扰源定位场景中定位精度低、信息利用率不足等问题,本文提出了一种基于导航信号特征的直接定位方法(DeSpreading Direct Position Determination,DS-DPD).通过建立融合传输时延、多普勒频移、扩频序列的接收信号模型,利用最大似然准则构建直接定位的目标函数,并通过求解目标函数得到待定位欺骗式干扰源的位置信息.仿真结果表明,DS-DPD能够有效提升对欺骗式干扰源的定位精度.尤其在低干噪比环境下,与传统的基于时延和多普勒信息的直接定位方法相比,所提方法的定位精度可提高10倍以上.
A direct position determination method called DS-DPD(DeSpreading Direct Position Determination)which is based on satellite navigation signal characteristics is proposed to improve the positioning accuracy of satellite navigation spoofing.The received signal model is first established,which takes the transmission delay,Doppler frequency shift and satellite code signal into account.The maximum likelihood(ML)criterion is then utilized to construct the objective function of DS-DPD,and the location parameters can be obtained through a two-dimensional spectral search of the objective function.The proposed method utilizes partial knowledge of the satellites’code sequences,which in turn provides significant gains in positioning accuracy.Numerical simulations verify the positioning performance improvement of the proposed DS-DPD algorithm.Especially,when the interference to noise ratio(INR)is-30 dB,the positioning accuracy could be improved by more than 10 times due to its full utilization of the delay,Doppler frequency shift and code sequences information.
作者
刘清
谢坚
王伶
王秋红
张兆林
LIU Qing;XIE Jian;WANG Ling;WANG Qiu-hong;ZHANG Zhao-lin(School of Electronic Information,Northwestern Polytechnical University,Xi'an,Shaanxi 710072,China;General Department of Satellite Application,China Academy of Space Technology,Beijing 100094,China)
出处
《电子学报》
EI
CAS
CSCD
北大核心
2022年第5期1117-1122,共6页
Acta Electronica Sinica
基金
国家自然科学基金(No.61971355,No.61871459,No.61771404)。
关键词
无源定位
欺骗式干扰源
直接定位
最大似然准则
扩频码序列
解扩
passive localization
spoofing
direct position determination(DPD)
maximum likelihood(ML)criterion
spread spectrum code sequence
despreading
