中文说明：一种求解信号DOA的方法。该方法首先将DOA的估计转化为MMV问题，然后采用联合稀疏约束将其转化为带稀疏约束问题的求解。
English Description：
A method to solve signal DOA. Firstly, the DOA estimation is transformed into MMV problem, and then the joint sparse constraint is used to solve the problem with sparse constraint.