Robust ISAR imaging based on compressive sensing from noisy measurements ?
the compressive sensing (CS) based ISAR imaging has exhibited high-resolution imaging quality when faced with limited spatial aperture. However, its performance is significantly dependent on the number of pulses and the noise level. In this paper, from the perspective of promoted sparsity constraint, a novel reconstruction model deducted from Meridian prior (MCS) is proposed. The detailed comparison of the proposed MCS model with the Laplace-prior-based CS model (LCS) is conducted. The Lorentz curve analysis testified the enhanced sparsity of the MCS model. Different from the algorithm for LCS model, in our solution procedure, the variance parameter is iteratively updated until the algorithm converges. Simulations and the ground truth data experiments of ISAR show that, with the decrease of the number of pulses and signal-to-noise ratio, the proposed model exhibits better performance in terms of resolution and amplitude error than that of the LCS model.
isar imaging compressed sensing promoted sparsity