Angle of departure aided sensor localization technique under multipath environment

A new angle of departure (AOD) aided distributed localization approach for wireless sensor node is proposed in this paper. An L-shaped antenna array is arranged on anchor node end and the ground single antenna sensor node conduct its own line of sight AOD estimation for self-localization. Considering the limited degree of freedom provided by the anchor node can not guarantee a successful recognition to the LOS signal component in multipath environment, we adopt the minimum redundancy configuration. Via the intrinsic character of wireless channel, the maximum degree of freedom through performing two-dimension joint difference co-array operation can be obtained at sensor node end. Therefore, the sensor node can identify the LOS signal component in a very high probability with a rebuild degree of freedom increased virtual array. The validity of proposed methods are verified by numerical examples.