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NASA-LLIS-1531
Lessons Learned - Indication of Post-Launch Degradation of the Downlink Signal due to Feedthrough (2003)
Year: 2005
Abstract: Abstract:
A feedthrough condition commonly occurs shortly after most JPL spacecraft launches during initial acquisition of the downlink signal. Caused by the extremely strong uplink signal transmitting over a relatively short distance, the indication of downlink signal degradation tends to elicit consternation from the Flight Control Team during a critical mission phase. Modify signal level and signal-to-noise ratio displays to indicate to the FCT when these indicators may be affected by feedthrough or saturation effects.
A feedthrough condition commonly occurs shortly after most JPL spacecraft launches during initial acquisition of the downlink signal. Caused by the extremely strong uplink signal transmitting over a relatively short distance, the indication of downlink signal degradation tends to elicit consternation from the Flight Control Team during a critical mission phase. Modify signal level and signal-to-noise ratio displays to indicate to the FCT when these indicators may be affected by feedthrough or saturation effects.
Subject: Communication Link
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| contributor author | NASA - National Aeronautics and Space Administration (NASA) | |
| date accessioned | 2017-09-04T15:53:09Z | |
| date available | 2017-09-04T15:53:09Z | |
| date copyright | 04/18/2005 | |
| date issued | 2005 | |
| identifier other | QOWEQCAAAAAAAAAA.pdf | |
| identifier uri | https://yse.yabesh.ir/std/handle/yse/56468 | |
| description abstract | Abstract: A feedthrough condition commonly occurs shortly after most JPL spacecraft launches during initial acquisition of the downlink signal. Caused by the extremely strong uplink signal transmitting over a relatively short distance, the indication of downlink signal degradation tends to elicit consternation from the Flight Control Team during a critical mission phase. Modify signal level and signal-to-noise ratio displays to indicate to the FCT when these indicators may be affected by feedthrough or saturation effects. | |
| language | English | |
| title | NASA-LLIS-1531 | num |
| title | Lessons Learned - Indication of Post-Launch Degradation of the Downlink Signal due to Feedthrough (2003) | en |
| type | standard | |
| page | 4 | |
| status | Active | |
| tree | NASA - National Aeronautics and Space Administration (NASA):;2005 | |
| contenttype | fulltext | |
| subject keywords | Communication Link | |
| subject keywords | Communication Systems | |
| subject keywords | Communications | |
| subject keywords | Downlink Degradation | |
| subject keywords | Flight Operations | |
| subject keywords | Ground Equipment | |
| subject keywords | Ground Operations | |
| subject keywords | Hardware | |
| subject keywords | Radio Frequency Subsystem | |
| subject keywords | Range Operations | |
| subject keywords | RF Compatibility | |
| subject keywords | RF Interference | |
| subject keywords | Risk Management/Assessment | |
| subject keywords | Safety & Mission Assurance | |
| subject keywords | Signal Acquisition | |
| subject keywords | Spacecraft | |
| subject keywords | Spacecraft Commanding |