Theoretical Estimation and Implementation of Signal-To-Noise Ratio Improvement.
Advanced Array research special rept. no. 2,
TEXAS INSTRUMENTS INC DALLAS SCIENCE SERVICES DIV
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The study was undertaken to determine if signal-to-noise improvements resulting from the addition of sensors to existing seismic-recording arrays could be theroretically estimated. A general process for estimating improvements is determined and presented, as well as a preliminary study of the feasibility of implementing the process. The first step in the general process is to estimate the noise field at the existing array by computing measured-noise crosspower matrices at each frequency used. Next a theoretical-noise crosspower matrix which approximates the measured-noise crosspower matrix is formed from a noise model compiled for each frequency. After a satisfactory noise model is obtained, the locations of additional sensors are determined by positioning them to minimize the new arrays straight-sum response to the major noise components. The new array is then evaluated by computing the improvement in the signal-to-noise ratio obtained after the new sensors are added. For the feasibility study, a 13-sensor station having a relatively simple and time-stationary noise field was selected. Obtainable signal-to-noise improvements were estimated when sets of one, two, or three sensors were added. Author
- Seismic Detection and Detectors