Multiple source direction finding with an array of M sensors using two receivers

Multiple source direction finding algorithms (e.g., MUSIC) are applied on simultaneous measurements collected by M sensors. However, practical considerations may dictate using less receivers than sensors, such that the measurements cannot be collected simultaneously. In such cases, data is collected sequentially from the different array elements in a process which is referred to as "time varying preprocessing", or "switching". In this paper we study multiple source direction finding (DF) with an array of M>2 elements, where only two receivers are available.