JP2012215568A5 - - Google Patents

Claims (14)

A synthetic aperture radar (SAR) system,
A non-uniform pulse generator;
An echo receiver;
A processor for reconstructing a SAR image from a sample of reflected echo ;
With
Transmit pulses and reflected echoes overlap in time ,
Missing data from the overlapping pulses are at different relative locations in time;
Synthetic aperture radar (SAR) system.   The system of claim 1, wherein the transmitted pulses are orthogonal to each other or incoherent, allowing separation of overlapping received pulses. The system of claim 1, wherein the reconstruction is iterative. The system of claim 1, wherein the reconstruction uses compressed sensing.   The system of claim 1, wherein the pulse timing is random or pseudo-random. The system of claim 1 , wherein the pulse timing is periodically non-uniform. The system of claim 1 , wherein the missing data is evenly distributed in the SAR image and coverage of a target area is substantially uniform.   The system of claim 1, wherein the SAR acquisition process is modeled as a linear operation.   The system of claim 1, wherein the reconstruction imposes data fidelity criteria.   The system of claim 1, wherein the reconstruction imposes a signal model. 11. A system according to claim 9 or 10, wherein there is a trade-off between data fidelity and signal model. The system of claim 11 , wherein the signal model is sparse in base. The system of claim 12 , wherein the basis is a wavelet basis. The system of claim 1, wherein the reconstruction uses an iterative gradient descent method with thresholding.