Two nominal DOA estimation methods of multiple distributed sources for nested array are proposed.
The proposed methods are based on difference co-array concept and they both exploit the annihilating property.
Both the AF method and the AF method with SLRA can be applied to the underdetermined case where distributed sources are more than physical sensors.
The proposed methods can work with unknown and different coherence loss parameters for the distributed sources.
The proposed AF method with SLRA is robust to the noise.