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Downward looking sparse linear array three-dimensional synthetic aperture radar (DLSLA 3-D SAR) can obtain 3-D scene properties and has broad application prospects. However, the reconstruction of cross-track dimension usually suffers from incomplete observation, which is caused by the non-uniformly and sparsely distributed virtual antenna phase centers. By formulating the cross-track reconstruction...
The target feature is sensitive to the aspect angle of SAR observation, making the interpretation and target recognition of the SAR image difficult. The information acquired from a certain aspect angle is partial and incomplete, and the multi-aspect observations have the potential to improve the SAR performance in this aspect. Three topics of fine feature description of multi-aspect SAR observations...
We propose a method based on the phase diagram tool to evaluate the sparse microwave imaging radar system. In the method, success rates of signal recovery are derived from the statistics of relative errors between the targets and the recovered signals. Success rates for each combination of SNR, sparsity and sampling ratio are provided to form a three-dimensional phase diagram. We demonstrate that...
This paper analyses ambiguity suppression caused by multiple-input multiple-output (MIMO) SAR azimuth nonuniform samplings. Two methods are analyzed: azimuth spectrum reconstruction algorithm and minimum mean square error (MMSE) imaging algorithm. The azimuth spectrum reconstruction algorithm can reconstruct the scene fine resolution, while the nonideal orthogonality of multi-channel encoding waveforms...
Interferometric coherence is a key quantity in Polarimetric SAR Interferometry (Pol-InSAR), but it is usually decreased (named decorrelation) by the decorrelation sources, such as polarization type, volume scatterers, instrument settings and processing errors. The analysis of decorrelation has been used to system performance assessment and vegetation parameter estimation. This paper presents two other...
In this paper, A new cross-layer design combining of adaptive modulation coding (AMC) with hybrid automatic repeat request (HARQ) based on rate-compatible low-density parity-check codes is proposed. In physical layer the AMC adjusts the data rates roughly according to the CSI by choosing different modulation mode. In data link layer HARQ adjusts the data rates accurately according to the CSI by changing...
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