Distributed ISAR spatial spectrum analysis and its influence on sparse recovery

The echo of distributed ISAR is modeled, and its spatial spectrum structure is analyzed under different array structures and different motion forms of target. Furthermore, when sparse recovery is used for cross-range imaging, the relationship between spatial spectrum structure and sparse recovery performance is discussed. Using the average coherence coefficient of the observation matrix as an index, the influence of accumulation time and sensor position is analyzed. These analyses are helpful to optimize the sparse recovery performance.