基于互质阵列的运动单站信号直接定位方法

Coprime Array Based Direct Position Determination of Signals with Single Moving Observation

信号直接定位方法是一种新型无源定位体制,具有适应低信噪比、无需参数关联等优势。为适应复杂电磁环境,该文提出了一种基于互质阵列的运动单站信号直接定位方法。以典型窄带信号为例,该文首先构建了互质阵列截获信号模型,然后推导了其差分共性阵对应的等效信号数学模型,最后使用空间谱技术构建了直接定位代价函数,实现了定位。经仿真分析验证,采用相同互质阵列时,该方法在分辨率和精度稍有损失的情况下可大幅提升传统直接定位方法的自由度,且与基于均匀线阵的直接定位方法相比,该方法在自由度、分辨率和定位精度等方面都具有优势。

Signal Direct Position Determination(DPD)is a novel passive localization technology,which shows superior performance in terms of low signal noise rate adaptability and no parameter association necessity.To adapt to the complex electromagnetic environment,this study proposes a coprime array-based DPD method with single moving observation.Considering narrowband signals as an example,this study first formulates the intercepted signal model,then derives its equivalent model related to the corresponding difference co-array,and finally builds the DPD cost function via spatial spectrum technology.Simulation results show that the proposed method can greatly improve the degree of freedom compared to the traditional DPD with a minor loss of resolution and accuracy when an identical coprime array is used.Meanwhile,compared to the uniform linear array-based DPD,the proposed method shows superior performance in terms of the degree of freedom,resolution,and accuracy of localization.