Distributed ice penetrating radar sounding using passive synchronization
Abstract/Contents
- Abstract
- A passive wireless synchronization approach is presented for distributed radar arrays. The application to bistatic radar tomography and orthogonal wave beamforming is investigated. Rather than using a separate synchronization channel, the passive synchronization approach uses the transmit phase and time information embedded in the direct path signal to synchronize echoes. Coherent summation recovery of echoes is demonstrated from the bottom of a 1 km thick glacier up to antenna separations of 1.45 km. The system achieves the largest bistatic offsets in glaciological literature and opens the door to bistatic radar tomography. The proof-of-concept demonstration could enable observations with antenna separations of 4 km or longer, which would provide sufficient inversion constraints for 2D mapping of a glacier's subsurface structure. Based on a simulated experiment with a 4 km transect, the system is expected to estimate temperature distribution on 50 m x 50 m grids with a predicted performance of 0.84±0.34°C mean temperature error, 3.62±0.89°C maximum temperature error and an error in relative basal permittivity of 0.65±0.46 using a Newton's Method inversion approach. This new measurement approach can provide valuable insight into the processes controlling shear margins and improve modeling of ice streams behavior, evolution, and projected sea level contribution. In-situ, high fidelity observations such as this are most valuable when paired with continent-scale measurements that enable extrapolation and placing the findings in a larger glaciological context. Therefore, the Jet Propulsion Laboratory is developing a distributed orbital radar sounder to obtain high coverage with sufficient clutter suppression for ice sheet sounding from orbit. This dissertation matures orthogonal wave beamforming which is required to passively synchronize the CubeSat radars. Specifically, an analytical orthogonality scheme titled Sinusoidal Frequency Modulated Continuous Wave is developed for radar applications. In total, our passively synchronized radar system is providing new measurement techniques for monitoring glaciers at scales that were not previously feasible.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2022; ©2022 |
| Publication date | 2022; 2022 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Bienert, Nicole Lee |
|---|---|
| Degree supervisor | Schroeder, Dustin |
| Thesis advisor | Schroeder, Dustin |
| Thesis advisor | Pauly, John (John M.) |
| Thesis advisor | Zebker, Howard A |
| Degree committee member | Pauly, John (John M.) |
| Degree committee member | Zebker, Howard A |
| Associated with | Stanford University, Department of Electrical Engineering |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Nicole Bienert. |
|---|---|
| Note | Submitted to the Department of Electrical Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2022. |
| Location | https://purl.stanford.edu/js381bq6260 |
Access conditions
- Copyright
- © 2022 by Nicole Lee Bienert
- License
- This work is licensed under a Creative Commons Attribution Non Commercial Share Alike 3.0 Unported license (CC BY-NC-SA).
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