From: Parameter estimation for SAR micromotion target based on sparse signal representation
Input:
H,g, K
Output:
f ^
f0 = 0
y = g
k = 0
Repeat
k ← k + 1
z←H⋆y
Ω ← supp( z 2S )
T ← Ω ∪ supp( fk-1)
b | T ← H T † g
b | T c ←0
fk← b S
y←g-Hfk
Until
convergence