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I believe that any statement that any Lacrosse constellation member is similar to Magellan are a complete fabrication.
Magellan is a probe whose SAR was designed to operate a long distance from a receiving station, where downlink windows are precious and, especially at the time, slow, and power is at a premium due to the number of instruments onboard. As such remote SARs are often designed to use burst-oriented chirp phases (this technique is associated with an imaging mode called ScanSAR in modern missions). While this decreases the size of data returned for ground processing, this comes at the expense of decreased resolution and increased doppler ambiguity for some parts of the image.
There are actually more reasons. (I think, but cannot confirm, that phase information was not preserved as a part of Magellan's measured results).
As such, a "continuous" chirp SAR makes far more sense for an intelligence application such as that the NRO would be using a platform akin to Lacrosse as described around the web. Downlink from orbit [??] is relatively fast (and has been for a long time), so compact data is not as necessary, as such at the expense of the amount of data to be downlinked the performance of the radar can be improved drastically.
As well, according to Cumming and Wong, Magellan was based on the Voyager bus and used a parabolic antenna (while images taken by amateurs of the satellite clearly indicate a planar antenna).
In summary, I believe that the likening of Magellan to an observation satellite in orbit to be false. SAR imaging man 17:34, 4 May 2007 (UTC)
Article reassessed and graded as start class. -- dashiellx ( talk) 11:19, 13 June 2008 (UTC)
"It is able to see through cloud cover and also has some ability to penetrate soil, __though there have been more powerful instruments deployed in space for this specific purpose__"
any sources on that?
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The structure of the article seem to be messed up near "In pop culture" and "traversing Canis Minor".
This is the
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This article deals with a military
black project.
Because of the nature of such projects, the most authoritative sources (any involved governments and defense contractors) may not even acknowledge its existence. The most reliable sources may be highly speculative. Please ensure that the article is well and reliably sourced and does not contain unverifiable information or vague predictions.For more details, see the black project working group of the military history project. |
I believe that any statement that any Lacrosse constellation member is similar to Magellan are a complete fabrication.
Magellan is a probe whose SAR was designed to operate a long distance from a receiving station, where downlink windows are precious and, especially at the time, slow, and power is at a premium due to the number of instruments onboard. As such remote SARs are often designed to use burst-oriented chirp phases (this technique is associated with an imaging mode called ScanSAR in modern missions). While this decreases the size of data returned for ground processing, this comes at the expense of decreased resolution and increased doppler ambiguity for some parts of the image.
There are actually more reasons. (I think, but cannot confirm, that phase information was not preserved as a part of Magellan's measured results).
As such, a "continuous" chirp SAR makes far more sense for an intelligence application such as that the NRO would be using a platform akin to Lacrosse as described around the web. Downlink from orbit [??] is relatively fast (and has been for a long time), so compact data is not as necessary, as such at the expense of the amount of data to be downlinked the performance of the radar can be improved drastically.
As well, according to Cumming and Wong, Magellan was based on the Voyager bus and used a parabolic antenna (while images taken by amateurs of the satellite clearly indicate a planar antenna).
In summary, I believe that the likening of Magellan to an observation satellite in orbit to be false. SAR imaging man 17:34, 4 May 2007 (UTC)
Article reassessed and graded as start class. -- dashiellx ( talk) 11:19, 13 June 2008 (UTC)
"It is able to see through cloud cover and also has some ability to penetrate soil, __though there have been more powerful instruments deployed in space for this specific purpose__"
any sources on that?
Hello fellow Wikipedians,
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(last update: 5 June 2024).
Cheers.— InternetArchiveBot ( Report bug) 11:01, 8 November 2017 (UTC)
The structure of the article seem to be messed up near "In pop culture" and "traversing Canis Minor".