Figure 4
From: Sparse signal processing on estimation grid with constant information distance applied in radar
Sensing matrices and corresponding coherences. Sensing matrix (left) and coherence plot (right) for the reference grid (a), the constant information distance grid (b), and the coherence-adjusted grid (c). Note that in (c), the sensing matrix contains less elements because a lower bound on cell size has been applied in order to limit the coherence, hence the lower number of column combinations (i, j).