Theory and applications of sparsity for radar sensing of ionospheric plasma
Abstract/Contents
- Abstract
- In order to enable flexible high-resolution measurements of ionospheric plasma phenomena, a sparsity-based radar waveform inversion technique is formulated and found to eliminate processing artifacts caused by the standard matched filter approach. Taking direction from the theory of compressed sensing, sparsity of the radar target scene is employed as prior knowledge to successfully perform the inversion. The result is cleaner data that limits self-interference of range-spread targets and enables differentiation in crowded and variable environments. Though the approach has been applied to ionospheric radar, it is generally applicable and especially relevant for radar target scenes with multiple or distributed scatterers. As a basis for the technique, a discrete radar model that captures signal sparsity in a delay-frequency dictionary is developed. This model is shown to have a strong connection to existing methods, resulting in an intuitive interpretation of the inversion technique as an iterative thresholding matched filter. An explicit formulation of the discrete model's representation of arbitrary distributed scatterers is derived, and it shows that sparsity is reasonably preserved in the discrete representation. Building on top of the model, waveform inversion is implemented using modern convex optimization techniques tailored for efficient computation and quick convergence. Finally, the real-world flexibility and effectiveness of the inversion technique is demonstrated by the elimination of filtering artifacts from meteor observations made with a variety of standard radar waveforms.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2014 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Volz, Ryan |
|---|---|
| Associated with | Stanford University, Department of Aeronautics and Astronautics. |
| Primary advisor | Close, Sigrid, 1971- |
| Thesis advisor | Close, Sigrid, 1971- |
| Thesis advisor | Erickson, Philip, 1965- |
| Thesis advisor | Kochenderfer, Mykel J, 1980- |
| Advisor | Erickson, Philip, 1965- |
| Advisor | Kochenderfer, Mykel J, 1980- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Ryan Volz. |
|---|---|
| Note | Submitted to the Department of Aeronautics and Astronautics. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2014. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2014 by Ryan Andrew Volz
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
Also listed in
Loading usage metrics...