[amsat-bb] Re: tle repair program

[Paul Williamson]

Where in the world are you getting TLE sets that don’t have a checksum? Boo!

It would be a one-line change to make NASAWASH always ignore the checksum on input (it always regenerates the checksum on output). With a little more effort this could be controlled by a command-line switch.

I can probably generate a quick hack executable for you if needed. Let me know what platform. Or if you’re set up to compile C programs you shouldn’t have any trouble modifying NASAWASH.

  -Paul


On Dec 21, 2013, at 6:05 AM, Jim White <jim at coloradosatellite.com> wrote:

> Thanks Paul.  I had forgotten about nasawash.
> But it did not help with these sets because it requires a valid checksum and these have no checksum byte at all.  Of course adding an arbitrary byte for the checksum does not help.
> 
> How about one that reads in tle's without regard to checksums and creates AMSAT format. Then creates TLEs from the AMSAT format. Perhaps that would clean them up. . .
> 
> Or something that reads a TLE and creates a valid checksum'd output. . .
> 
> Jim
> 
> On 12/20/2013 5:25 PM, Paul Williamson wrote:
>> There’s still NASAWASH, which will do some of that.
>> 
>> http://mustbeart.com/software/nasawash.html
>> 
>> The program could do more to fix spacing problems, but some of what you want is impossible or very difficult. The NASA format is pretty compact and doesn’t have a lot of redundancy that would make it easy for a program to figure out what was meant by some corrupted version.
>> 
>>   -Paul
>> 
>> On Dec 20, 2013, at 3:19 PM, Jim White <jim at coloradosatellite.com> wrote:
>> 
>>> Does anyone know of a program that will 'repair' tle's so they have the right format, spacings, checksums, etc. to assure they will read into various tracking programs?
> 
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