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And here's the calibrated COAS (aft position) with daylight filter mounted... It's surprisingly tedious to make the device actually useful - since (like a HUD), it is a combiner and hence a projection from infinity - so just painting the pattern onto the glass is not enough, because then the...

Interesting... and easy to do, thanks. That's terrific, thanks. So the 20 m the radar page mentioned are in fact pretty close to the 80 ft of range.And we now know why the star tracker with an arcmin of resolution is the preferred angular measuring device. Nice. ---------- Post added...

First tests with the brand-new mountable COAS frame - ISS visible through the recticie. Still need to polish the alignment, hook it up properly to the electric system ad such, but it sure adds to the proximity ops experience.

Someone over in the FG forum managed to dig out a good number for the star tracker accuracy - it's in the Rendezvous workbook where it gives the 1 sigma error band to about an arcmin (which is vrey precise...) Geez, hunting down these numbers surely is tedious...

Anything really. I've found a radar webpage (Shuttle unrelated) that gave me a ranging accuracy estimate of 20-50 m for various types of radar, which sounds pretty miserable for doing a rendezvous with docking in space, I know the figure of merit for an inertial nav is about a mile of drift...

Tinkering with the rendezvous state vector filters on SPEC 33 - anyone has an idea what kind of accuracy to expect from the radar in ranging/angle or from the star tracker?

Finally I got our new movie-making toy under control - a cam drone. Today was decent flight weather (no snowfall, not too cold such that the battery delivers,...) and while I was slightly overworked on the first two attempts two days ago *cough*, the drone performed flawlessly today and we could...

Earth rotates ~360 degrees in 24 hours, so each minute you wait changes the longitude of the ascending node by 0.25 degrees. Realistic propellant reserves won't give you more than 1-2 degrees or so via dogleg, so you can readily see how that expands you window by just a few minutes.

You've discovered the existence of a planar and of a phasing launch window. The planar window occurs twice daily when Earth rotates you into the right spot to insert into a given plane (and by-dog-legging you can widen it to perhaps 10 minuts or so), the phasing window occurs more often. In...

Not at all, all things considered. Except when you code a targeting routine with that accuracy, I guarantee you users won't see it that way and endlessly complain how they missed again by a huge margin :lol:

At that altitude, the main effect is rather j3 gravity than the moon... It just means you're using the wrong tool (or need to switch to pointmass gravity). In a realistic environment, orbital elements change over time. Which in a nutshell means your orbit isn't an ellipse, it wobbles quite a...

Generally the orbital elements are constants of motion only for a two-body pointmass problem - in a realistic gravity field of an extended non-spherical body and multiple bodies around, some of them will oscillate around a mean value, others will in addition drift as precession alters the orbit...

As should be very apparent from the rather botched job that is the ISS 3d model - I'm not a 3d modeler :lol: (I wasn't actually sure that the location was supposed to be in the model, I more or less went with a rough visual comparison). The usual pattern is that this eventually annoys a decent...

Okay, let's continue where we left off - on the vbar of ISS. The Shuttle is not put vertical with the payload bay pointing towards ISS - that allows good operations of the Ku-antenna as radar ranging device. The REL NAV display shows the radar ranging data, while the Shuttle is piloted looking...

So forgive my ignorance (I'm only loosely following SSU development and not reading every detail) - what level of MCC would you like to have? As for myself, I much prefer to arrange the simulated world to my needs (i.e. I have orbital rendezvous targets configurable), and for anything that...

I'm not exactly sure what you're missing? I thought GinGin has done a successful rendezvous re-creating the early assembly of ISS with SSU of late?:idk: Otherwise, years ago I even managed to fly stock Atlantis to ISS with some pen and paper navigation and nowhere near the support an automated...

I suppose ultimately we all use NASA's Pale Blue Marble - so similarities might be natural :lol: Otherwise Earthview has been like this for a while (the linked post is from 2016) - I'm occasionally adding details like the thunderstorms or relief shading of the clouds in moonlight when I feel...

Doing the last leg to ISS, from a phasing orbit about 15 km lower and 120 km behind right to a vbar stationkeeping position off ISS. Preparation starts during dusk over Africa - see the illumination on the horizon? That's a tropical thunderstorm raging... The on-board Lambert solver spits...

f would seem to be the true anomaly of the orbit.

Given the rather substantial propellant needs of changes of the orbital plane, I suspect using the RCS is two orders of magnitude too weak for anything meaningful. * Make a launch at one specific time into the desired inclination. Get pen and paper and write down the longitude of the ascending...