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Questions tagged [accuracy]

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0answers
105 views

How presise could 2 satellites “thread the needle” in orbit?

I have a question about using a magnetic field to propel 2 satellites off each other while traveling in opposite directions on the same orbital plain to intersect either 2:1 or 1:1 on each orbit ...
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0answers
146 views

TLE/SGP4 state vector accuracy assessment

I’m using the Planet Labs state vectors downloadable from http://ephemerides.planet-labs.com/planet.states or http://ephemerides.planet-labs.com/planet_YYYYMMDD.states to assess the TLEs/SGP4 accuracy ...
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1answer
171 views

how “off” (as a percentage) would an attempt at geostationary orbit need to be (in either distance or speed) for a satellite to fall

how "off" (as a percentage) would an attempt at geostationary orbit need to be (in either distance or speed) for a satellite to fall to earth in 100, 1000 or 10,000 years? (assumes initial setup only,...
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2answers
909 views

How does a cell phone GPS receiver work without an onboard atomic clock [duplicate]

This question and its answers explain the basic theory behind GPS. I particularly like the second answer by @jah138. Using jah138's notation, GPS satellites provide extremely accurate $x_i$, $y_i$, ...
4
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1answer
322 views

How does the Orbit Determination Accuracy depend on the number of measurements?

How does the number of observations of spacecraft position and velocity affect the orbit determination accuracy? Suppose in one case we have 1000 instances of position and velocity measurements with a ...
11
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1answer
816 views

How does the landing accuracy of Dragon (under parachutes) compare to Soyuz?

The Dragon capsule landed yesterday, and I saw this picture of it: Historically, capsules had a rather large uncertainty when landing, especially with parachutes. This picture was obviously taken ...
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2answers
984 views

Which has greater accuracy? Minuteman ICBM or Falcon 9 first stage?

The really fun part about watching SpaceX land their first stage on either their ASDS Barge (JRTI or OCISLY) or Landing Zone 1 on land, is they drew a nice target on the surface. There is a literal ...