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A real-time signal combining system for ka-band feed arrays using maximum-likelihood weight estimates
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Rodemich, E. R. Vilnrotter, V. A. |
| Copyright Year | 1990 |
| Description | A real-time digital signal combining system for use with Ka-band feed arrays is proposed. The combining system attempts to compensate for signal-to-noise ratio (SNR) loss resulting from antenna deformations induced by gravitational and atmospheric effects. The combining weights are obtained directly from the observed samples by using a sliding-window implementation of a vector maximum-likelihood parameter estimator. It is shown that with averaging times of about 0.1 second, combining loss for a seven-element array can be limited to about 0.1 dB in a realistic operational environment. This result suggests that the real-time combining system proposed here is capable of recovering virtually all of the signal power captured by the feed array, even in the presence of severe wind gusts and similar disturbances. |
| File Size | 1056326 |
| Page Count | 19 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19900012572 |
| Archival Resource Key | ark:/13960/t1tf4q28z |
| Language | English |
| Publisher Date | 1990-02-15 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Extremely High Frequencies Microwave Antennas Atmospheric Effects Statistical Analysis Deformation Digital Systems Signal To Noise Ratios Estimating Real Time Operation Deep Space Network Losses Gravitational Effects Maximum Likelihood Estimates Gusts Antenna Arrays Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
