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CX2SA > SATDIG 27.03.13 21:01l 187 Lines 5988 Bytes #999 (0) @ WW
BID : AMSATBB896
Read: GUEST
Subj: AMSAT-BB-digest V8 96
Path: IZ3LSV<ED1ZAC<CX2SA
Sent: 130327/1901Z @:CX2SA.SAL.URY.SA #:4697 [Salto] FBB7.00e $:AMSATBB896
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: satellite los footprints (Ken Ernandes)
2. 6268 km on FO-29 (Bob- W7LRD)
3. Re: satellite los footprints (Joe Fitzgerald)
4. Re: satellite los footprints (John Magliacane)
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Message: 1
Date: Tue, 26 Mar 2013 15:10:04 -0400
From: Ken Ernandes <n2wwd@xxxxxxxxxx.xxx>
To: Joseph Armbruster <josepharmbruster@xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxx BB" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: satellite los footprints
Message-ID: <5AF52694-F517-4C5C-8F76-9319EF72BBCC@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Joe -
I did the implementation described in a professional flight dynamics
software program. The convention (as specified by the gov't) is to have an
array of 360 azimuthal "obscura" elevations. The first entry defines the
minimum elevation for 0 to 1 deg in azimuth, the second entry defines the
minimum elevation for 1 to 2 deg in azimuth, up to the 360th entry defining
359 to 0/360 deg in azimuth. The 1-deg wide azimuthal increments are narrow
enough that you get an excellent obscura picture even with the elevations
being a step function. It provides a great way to anticipate when
obstructions may interfere with an RF or visible LOS.
73, Ken N2WWD
Sent from my iPad
On Mar 26, 2013, at 2:34 PM, Joseph Armbruster <josepharmbruster@xxxxx.xxx>
wrote:
> Joe,
>
> What tracking program is that?
>
> I was thinking of making my satellite icons configurable. This way the
satellite would look like the actual satellite. Even better, I could store
collada models for them and load them in place of the icon. Oh la la,
that's an idea.
>
> Joseph Armbruster
>
>
> On Mar 26, 2013, at 7:58 AM, Joe Fitzgerald wrote:
>
>> On 3/25/2013 6:42 PM, Ken Ernandes wrote:
>>> 2. If you decide to give the users the ability to input their location,
them the option to provide either a single minimum elevation angle or a
local map -- i.e., 360 individual minimum elevations as a function of
Azimuth. It's much easier to project this and the user is generally
interested in an unobstructed LOS with respect to his/her location.
>>>
>>>
>>
>> It's not the best resolution but in the image below, you can see how
there are "cut outs" in the circles surrounding NASA's ground stations - the
software has clearly implemented the idea Ken outlined above. For example,
there is apparently some obstruction to the south east of the Hawaiian
tracking station. If the sub-satelite point is inside the white line it's
AOS. The surface of the earth visible to the shuttle, on the other hand, is
simply a red circle, just faintly visible in this image.
>>
>> http://vault.newsfromspace.com/missions/sts114/STS114_land-5.jpg
>>
>> -Joe KM1P
>> _______________________________________________
>> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
>> Not an AMSAT-NA member? Join now to support the amateur satellite program!
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>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 2
Date: Tue, 26 Mar 2013 22:11:38 +0000 (UTC)
From: Bob- W7LRD <w7lrd@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] 6268 km on FO-29
Message-ID:
<1031616852.12899.1364335898005.JavaMail.root@xxxxxxx.xxxxxxxxxx.xx.xxxx.xxxxx
xx.xxx>
Content-Type: text/plain; charset=utf-8
Just chatted with Boris UA0QJ in PP42 from CN87 (Seattle). Probably not a
record (anyone keeping track of these things?), but a fun endeavor. Very low
elevations both ways. If this stuff were easy, everyone would be doing it.
Thanks Boris!
73 Bob W7LRD
Seattle, Wa. CN87wk
------------------------------
Message: 3
Date: Wed, 27 Mar 2013 00:03:06 -0400
From: Joe Fitzgerald <jfitzgerald@xxxx.xxx.xxx>
To: Joseph Armbruster <josepharmbruster@xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxx BB" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: satellite los footprints
Message-ID: <51526F7A.2090905@xxxx.xxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
On 3/26/2013 2:34 PM, Joseph Armbruster wrote:
> Joe,
>
> What tracking program is that?
>
I am not sure what they call it, but I believe it is a custom NASA
program. It was used in the Shuttle mission control center, and they
often put it up on NASA TV when S band telemetry was available, but Ku
band TV was not.
-Joe
------------------------------
Message: 4
Date: Wed, 27 Mar 2013 07:11:48 -0700 (PDT)
From: John Magliacane <kd2bd@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: satellite los footprints
Message-ID:
<1364393508.62668.YahooMailClassic@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
--- On Wed, 3/27/13, Joe Fitzgerald <jfitzgerald@xxxx.xxx.xxx> wrote:
> On 3/26/2013 2:34 PM, Joseph Armbruster wrote:
> > Joe,
> >
> > What tracking program is that?
> >
>
> I am not sure what they call it, but I believe it is a
> custom NASA program.? It was used in the Shuttle
> mission control center, and they often put it up on NASA TV
> when S band telemetry was available, but Ku band TV was
> not.
>
> -Joe
It *MIGHT* be (or, at least at one time was) a program called DEMOS
(Distributed Earth Model and Orbiter System) running on a Sun workstation.
73, de John, KD2BD
--
Visit John on the Web at:
http://www.qsl.net/kd2bd/
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
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End of AMSAT-BB Digest, Vol 8, Issue 96
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