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The effect of aperture averaging upon tropospheric delay fluctuations seen with a dsn antenna
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Linfield, R. |
| Copyright Year | 1996 |
| Description | The spectrum of tropospheric delay fluctuations expected for a DSN antenna at time scales less than 100 s has been calculated. A new feature included in these calculations is the effect of aperture averaging, which causes a reduction in delay fluctuations on time scales less than the antenna wind speed crossing time, approximately equal to 5-10 s. On time scales less than a few seconds, the Allan deviation sigma(sub y)(Delta(t)) varies as (Delta(t))(sup +1), rather than sigma(sub y)(Delta(t)) varies as (Delta(t))(exp -1/6) without aperture averaging. Due to thermal radiometer noise, calibration of tropospheric delay fluctuations with water vapor radiometers will not be possible on time scales less than approximately 10 s. However, the tropospheric fluctuation level will be small enough that radio science measurements with a spacecraft on time scales less than a few seconds will be limited by the stability of frequency standards and/or other nontropospheric effects. |
| File Size | 323366 |
| Page Count | 7 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19960022218 |
| Archival Resource Key | ark:/13960/t1sf7q19t |
| Language | English |
| Publisher Date | 1996-02-15 |
| Access Restriction | Open |
| Subject Keyword | Communications And Radar Deep Space Network Transmission Rate Communications Calibrating Directional Antennas Troposphere Variations Apertures Atmospheric Attenuation Deviation Transmission Loss Spacecraft Tracking Transmission Efficiency Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
