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Results tagged with guidance
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user 195
Questions which relate to how spacecraft and rockets navigate and stay on course.
9
votes
1
answer
4k
views
Coefficients for linear tangent steering law
tangent" steering law is optimal for orbital insertion of a launch vehicle:
$$\tan \psi = a\cdot t + b$$
i.e. the tangent of the flight path angle changes linearly from the point at which insertion guidance … Assuming that an open-loop pitch guidance program is used for the initial ascent, linear-tangent guidance will take over from a given velocity vector and position, and our goal is to reach a given altitude …
- 172k
8
votes
1
answer
890
views
How does the Apollo LM ascent guidance program P12 actually work?
P12 is the AGC guidance program for normal ascent from the lunar surface to orbit. … According to the doc, however, "the insertion-phase guidance logic is defined by an acceleration command which is a linear function of time"; it's not clear from the text whether the insertion phase is …
- 172k
7
votes
2
answers
440
views
Did the Apollo LM's cockpit altitude displays account for the pointing angle of the radar al...
†) but the LM guidance system would
be aware of its pitch and roll attitude relative to the local vertical, so it could factor out the cosine for a better estimate of the correct altitude. … † The guidance computer did include a very crude, low resolution 2-D representation of a cross section of terrain at the expected landing site, which could conceivably be used for correcting altitude for …
- 172k