Questions tagged [algorithms]
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16 questions
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1answer
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Understanding the shape of the trajectory in this simplified phase plane control diagram - continuous thrust or impulses?
(image from linked question) In this answer to Modeling attitude control: ramping/easing between attitude commands? the image above is described as A phase plane control diagram depicts how the ...
- 153k
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Is the "light-time" correction for the Moon's position in Meeus "Astronomical Algorithms" putting the Moon in inertial position or apparent position?
I'm looking at the second edition of Meeus's "Astronomical Algorithms," chapter 47, "Position of the Moon." At the bottom of page 337, right before getting into the actual formulae ...
- 1,059
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Is my code correct to get six Keplerian parameters?
Is my code correct to get six Keplerian parameters? ...
- 19
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How does the Gpredict software algorithm track satellites?
I was wondering how Gpredict calculates the ground tracks, Lat, Long and elevation based on a ground station. If I understand correctly, Gpredict takes the values from a TLE (Two-Line Element) set, ...
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1answer
751views
Which method STK uses to compute Umbra or Penumbra time intervals?
someone knows in which way STK computes the eclipse times for a satellite? I use a Matlab code taken from D.Vallado's library (ALGORITHM 34) but even if I use a PVT provided by STK (1 sec time step) ...
- 367
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1answer
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GMAT: What causes the error "ArrayTemplate error : dimension error"?
I have made various scripts that work with GMAT, but once in a while I get an "ArrayTemplate error : dimension error" error. I do not know what causes it, as in this case my script appears ...
- 369
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Solar Sail mission
Sorry for my English. I'm not native speaker I would like your advice in solar sail mission simulation. The purpose is to compare results with results in Wolfram Mathematica. We have CubeSat with ...
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3votes
2answers
985views
Satellite Revisit Time Analysis
I am currently making up my mind about revisit analysis. I am searching for clever algorithms to implement this in Matlab. I want to define targets on Earth surface and get the revisit times for each ...
- 121
3votes
1answer
700views
Code to generate Sun-Earth L2 halo orbits for given epoch?
I am working on a GMAT script out of personal interest (not part of a job) that involves a spacecraft orbiting the Sun-Earth L2 point. I have found some orbital state vectors for the spacecraft that ...
- 369
5votes
1answer
153views
Please explain a way of calculation of Lagrange multiplier in algorithm of low thrust transfer
In David Vallado's book 'Fundamental of Astrodynamics and Applications', chapter 6.7. ("Continuous-Thrust Transfers") there is an algorithm #47: Low Thrust Transfer. In this algorithm a ...
4votes
1answer
419views
If the Voyagers' lowest playback speed is 7200 bits per second, how can it transmit to Earth at only 160 bps?
How to calculate data rate of Voyager 1? mention's Voyager's data rate is currently 160 bits per second, and clicking on a recent entry in the Voyager DSN Tracking Schedule on the Voyager Mission ...
- 153k
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1answer
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Did the Voyager spacecraft use a Golay, a Reed-Solomon and/or a Hamming code for data transmission encoding for error correction? (Need clarification)
The now-famous answer to How is stacking oranges in 24 dimensions related to receiving and decoding signals from the Voyagers? is worth stopping now here and going back and reading first. Okay welcome ...
- 153k
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What Voyager spacecraft hardware performed transmitted data coding in such a complicated way? Did ground decoding use “a big monster filling a rack”?
The now-famous answer to How is stacking oranges in 24 dimensions related to receiving and decoding signals from the Voyagers? is worth stopping now here and going back and reading first. Okay welcome ...
- 153k
65votes
1answer
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How is stacking oranges in 24 dimensions related to receiving and decoding signals from the Voyagers?
I was listening to Sphere Packing Solved in Higher Dimensions; A Ukrainian mathematician has solved the centuries-old sphere-packing problem in dimensions eight and 24. and reading the transcript ...
- 153k
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How many decimal places in GNC numbers?
My launch simulation's producing numbers on the order of 1e-12 and sometimes smaller. I can't imagine that any sensor would be so precise and therefore that 10+ decimal places would be meaningful or ...
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