Imperial College London
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Professor Tom Pike

Faculty of Engineering, Department of Electrical and Electronic Engineering

Professor of Microengineering
 
 
 
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Contact

 

+44 (0)20 7594 6207w.t.pike

 
 
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Location

 

604Electrical EngineeringSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Sollberger:2021:10.1029/2020EA001234,
author = {Sollberger, D and Schmelzbach, C and Andersson, F and Robertsson, JOA and Brinkman, N and Kedar, S and Banerdt, WB and Clinton, J and van, Driel M and Garcia, R and Giardini, D and Grott, M and Haag, T and Hudson, TL and Lognonné, P and Pierick, JT and Pike, W and Spohn, T and Stähler, SC and Zweifel, P},
doi = {10.1029/2020EA001234},
journal = {Earth Space Sci},
title = {A Reconstruction Algorithm for Temporally Aliased Seismic Signals Recorded by the InSight Mars Lander.},
url = {http://dx.doi.org/10.1029/2020EA001234},
volume = {8},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - In December 2018, the NASA InSight lander successfully placed a seismometer on the surface of Mars. Alongside, a hammering device was deployed at the landing site that penetrated into the ground to attempt the first measurements of the planetary heat flow of Mars. The hammering of the heat probe generated repeated seismic signals that were registered by the seismometer and can potentially be used to image the shallow subsurface just below the lander. However, the broad frequency content of the seismic signals generated by the hammering extends beyond the Nyquist frequency governed by the seismometer's sampling rate of 100 samples per second. Here, we propose an algorithm to reconstruct the seismic signals beyond the classical sampling limits. We exploit the structure in the data due to thousands of repeated, only gradually varying hammering signals as the heat probe slowly penetrates into the ground. In addition, we make use of the fact that repeated hammering signals are sub-sampled differently due to the unsynchronized timing between the hammer strikes and the seismometer recordings. This allows us to reconstruct signals beyond the classical Nyquist frequency limit by enforcing a sparsity constraint on the signal in a modified Radon transform domain. In addition, the proposed method reduces uncorrelated noise in the recorded data. Using both synthetic data and actual data recorded on Mars, we show how the proposed algorithm can be used to reconstruct the high-frequency hammering signal at very high resolution.
AU  - Sollberger,D
AU  - Schmelzbach,C
AU  - Andersson,F
AU  - Robertsson,JOA
AU  - Brinkman,N
AU  - Kedar,S
AU  - Banerdt,WB
AU  - Clinton,J
AU  - van,Driel M
AU  - Garcia,R
AU  - Giardini,D
AU  - Grott,M
AU  - Haag,T
AU  - Hudson,TL
AU  - Lognonné,P
AU  - Pierick,JT
AU  - Pike,W
AU  - Spohn,T
AU  - Stähler,SC
AU  - Zweifel,P
DO  - 10.1029/2020EA001234
PY  - 2021///
SN  - 2333-5084
TI  - A Reconstruction Algorithm for Temporally Aliased Seismic Signals Recorded by the InSight Mars Lander.
T2  - Earth Space Sci
UR  - http://dx.doi.org/10.1029/2020EA001234
UR  - https://www.ncbi.nlm.nih.gov/pubmed/34595325
VL  - 8
ER  -
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