Re: Keps Adjuster Software Needed

Bjoern Gimle (bjorn@tt-tech.se)
Fri, 05 Sep 1997 17:11:40 +0200

Eric Rosenberg wrote:

> >I have adj2l and it doesn't do quite what I want.
>
> >I need adjust the elset (epoch time = launch time) to put the satellite at the
> >launch site.
>
> >Is there a piece of software than can do this?
>

I wrote a private answer to Eric, noting that VEC2TLE (in V2L9yww.zip)
does just that.

Here is a description on how it can be done :

Faisat-2v 970923 16:44 UTC                       1014 x 978
1 97025U 97002V   97266.68332521  .00000008  00000-0  10000-4 0   108
2 97025  82.9184 281.7361 0024279 273.4977  86.3400 13.71043547    04

Save the above three lines (or the entire message) on a file, and
start VEC2TLE and select this file from File / TLE Input File   menu.

Also select a suitable output file from the file menu.

On File / Data Output Options I set Two-line Elements to
'Append new TLEs'

Choose Settings / Epoch Control / Vector Time

Choose Compute TLE / Impulsive Delta-V
(You can set -1 for drag parameters that can be computed from
other drag parameters, or modify other elements )
I changed Bstar to 0.10000E-3 and ndot/2 to -1

Press OK, select the Ignition Time ( =Epoch in this case ) format
and enter the desired time (1997266164400.).
Accept the 0.0 Burn values.

The Epoch in the displayed elset (97266.6972222) is 16:44
The (true anomaly?) 273.33+155.06-360 = 68.39 is close to
Plesetsk.

On the selected output file, you will find:

Faisat-2v 97
1 97025U 97002V   97266.69722222  .00000089  00000-0  10000-3 0   119
2 97025  82.9184 281.7258 0024279 273.3318 155.0597 13.71043549    11

You can use ORBITEL.EXE /O /N output.tle to add orbital heights:

Faisat-2v 97                                     1014 x 978
1 97025U 97002V   97266.69722222  .00000089  00000-0  10000-3 0   119
2 97025  82.9184 281.7258 0024279 273.3318 155.0597 13.71043549    11


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