Method and system for reconstructing scenes using virtual arrays of transducers and joint sparsity models
View Patent ↗A scene is reconstructed by receiving pulses transmitted by a virtual array of transducers. The pulses are reflected by the scene. The virtual array has a set of configurations subject to positioning errors. Each received pulse is sampled and decomposed to produce frequency coefficients stacked in a set of linear systems modeling a reflectivity of the scene. There is one linear system for each configuration. A reconstruction method is applied to the set of linear systems. The reconstruction method solves each linear system separately to obtain a corresponding solution. The corresponding solutions share information during the solving. Then, the solutions are combined to reconstruct the scene.
1. A system for reconstructing a scene, comprising:
an array of radar transducers configured to transmit pulses at the scene and receive the pulses reflected by the scene, wherein the array has a set of configurations subject to positioning errors;
a processor connected to the array of transducers for sampling and decomposing each received pulse to produce frequency coefficients stacked in a set of linear system of equations modeling a reflectivity of the scene, wherein there is one linear system of equations for each configuration; and
applying a reconstruction method to the set of linear system of equations by
solving each linear system of equations separately to obtain a corresponding solution, while the corresponding solutions share information during the solving; and
combining the solutions to reconstruct the scene, wherein the combining produces an average of the solutions.
2. The system of claim 1 , wherein the information is a support of each solution during the reconstructing.
3. The system of claim 2 wherein the support is common among the solutions during the reconstructing.
4. The system of claim 2 , wherein the support is enforced to be identical for all solutions during the reconstructing.
5. The system of claim 1 , wherein a joint-sparsity model is used during the reconstructing.
6. The system of claim 5 , wherein a convex optimization is used during the reconstructing.
7. The system of claim 5 , wherein a greedy method is used during the reconstructing.
8. The system of claim 1 , wherein a model of the scene is enforced during the reconstructing.
9. The system of claim 1 , wherein the average is an average magnitude of coefficients of the solutions.
10. The system of claim 1 , wherein the average is an average of square magnitudes of coefficients of the solutions.
11. The system of claim 10 , wherein the combining takes a square root of the average.
12. The system of claim 1 , wherein the combining determines a common support for the solutions.
13. The system of claim 1 , further comprising:
merging the linear systems of equations.