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Maximum-likelihood spectral estimation and adaptive filtering techniques with application to airborne doppler weather radar. thesis technical report no. 20
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Lai, Jonathan Y. |
| Copyright Year | 1994 |
| Description | This dissertation focuses on the signal processing problems associated with the detection of hazardous windshears using airborne Doppler radar when weak weather returns are in the presence of strong clutter returns. In light of the frequent inadequacy of spectral-processing oriented clutter suppression methods, we model a clutter signal as multiple sinusoids plus Gaussian noise, and propose adaptive filtering approaches that better capture the temporal characteristics of the signal process. This idea leads to two research topics in signal processing: (1) signal modeling and parameter estimation, and (2) adaptive filtering in this particular signal environment. A high-resolution, low SNR threshold maximum likelihood (ML) frequency estimation and signal modeling algorithm is devised and proves capable of delineating both the spectral and temporal nature of the clutter return. Furthermore, the Least Mean Square (LMS) -based adaptive filter's performance for the proposed signal model is investigated, and promising simulation results have testified to its potential for clutter rejection leading to more accurate estimation of windspeed thus obtaining a better assessment of the windshear hazard. |
| File Size | 3039951 |
| Page Count | 88 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19950017250 |
| Archival Resource Key | ark:/13960/t6p033m22 |
| Language | English |
| Publisher Date | 1994-11-28 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Meteorological Radar High Resolution Wiener Filtering Adaptive Filters Wind Velocity Flight Hazards Clutter Simulation Least Squares Method Airborne Radar Signal Processing Maximum Likelihood Estimates Doppler Radar Wind Shear Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Thesis |
