From: Decoupled 2D direction-of-arrival estimation based on sparse signal reconstruction
Methods | Degrees of freedom | |||
---|---|---|---|---|
 | Single snapshot | Multiple snapshots | ||
l 1-SVD | M N/2 | M N−1 | ||
2D- l 1-SVD- α | α | M/2 | α | M−1 |
 | β for each α | N/2 | β for each α | N−1 |
 | Maximum | M N/4 | Maximum | (M−1)(N−1) |
2D- l 1-SVD- β | β | N/2 | β | N−1 |
 | α for each β | M/2 | α for each β | M−1 |
 | Maximum | M N/4 | Maximum | (M−1)(N−1) |