[amsat-bb] DSLWP-2 elements for GMAT?

Wed Jun 27 13:08:27 UTC 2018

Apostolos,

I don't think you are doing anything wrong. Your results look correct.
But I cannot check everything because I am running the most recent
version of the script with the 29 June orbital elements.

Sometimes I also get the 'NaN' result in the elevation column. I think
this is a program bug. I found that sometimes it helps to do the
following: stop GMAT, start GMAT, load the script, immediately run
the script before doing anything else with the program.

I hope this helps.

73, Nico

On 27-06-18 13:25, Apostolos Kefalas wrote:
> On Sun, 2018-06-24 at 09:04 +0200, Nico Janssen wrote:
>> Ken,
>>
>> You can always find the most recent LongJiang 2 orbital elements for
>> GMAT in my GMAT script for LongJiang 2 here:
>> https://hamsat1.home.xs4all.nl/LongJiang2_NYC.script
>>
>> For further information see my web page:
>> https://hamsat1.home.xs4all.nl/index.html
>>
> Hello Nico,
>
> I am trying to use your script for GMAT and learn a little bit of it. I
> am using GMAT R2018a 64bit for linux.
>
> So far I have added a new "Ground Station" with the exact same
> "options" of "New_York_City", but with the coordinates of Athens
> (Lat:38.0246 , Lon:23.8442, Elev:0.230)
>
> Also in the "Event Locators -> ContactLocator->Observers" I have
> unchecked New_York_City and checked Athens.
>
> I run the Analysis and get the following:
>
> Target: LongJiang2
>
> Observer: Athens
> Start Time (UTC)            Stop Time (UTC)               Duration
> (s)
> 22 Jun 2018 20:00:01.308    22 Jun 2018
> 23:57:54.270      14272.962042
> 23 Jun 2018 13:30:48.606    24 Jun 2018
> 00:31:55.696      39667.090330
> 24 Jun 2018 14:29:38.778    25 Jun 2018
> 01:08:24.795      38326.017501
> 25 Jun 2018 15:29:40.410    26 Jun 2018
> 01:47:31.343      37070.933417
> 26 Jun 2018 16:25:59.568    27 Jun 2018
> 02:18:55.784      35576.216663
> 27 Jun 2018 17:18:46.946    28 Jun 2018
> 03:01:47.463      34980.517488
> 28 Jun 2018 18:07:27.244    29 Jun 2018
> 03:51:26.879      35039.635199
> 29 Jun 2018 18:51:47.025    30 Jun 2018
> 04:46:31.909      35684.884510
> 30 Jun 2018 19:31:54.199    01 Jul 2018
> 05:46:51.938      36897.739497
> 01 Jul 2018 20:08:14.499    02 Jul 2018
> 06:32:57.414      37482.914687
>
>
> Number of events : 10
>
>
> According to the above there should be a "pass" over my location on 27
> Jun 2018 17:18:46.946 until 28 Jun 2018 03:01:47.463 (correct?)
>
> But when I see the ReportFile1 I get:
>
>
> ........ (snip)
>
> 27 Jun 2018
> 17:23:32.914   150.5092511914209                        NaN
>                            419362.0357962959                         282
> 97.22511514511
> 27 Jun 2018
> 17:40:29.154   142.0321174249796                        NaN
>                            418700.9067020232                         282
> 97.23687717522
> 27 Jun 2018
> 18:00:10.948   133.4730126623195                        NaN
>                            417834.3036042269                         282
> 97.25055535639
> 27 Jun 2018
> 18:18:31.981   126.6220879528141                        NaN
>                            416924.6852335503                         282
> 97.26329879122
> 27 Jun 2018
> 18:33:21.680   121.7549078882987                        NaN
>                            416111.3291154901                         282
> 97.27359622712
> 27 Jun 2018
> 18:48:06.639   117.4075174974269                        NaN
>                            415226.7124895696                         282
> 97.28383881658
> 27 Jun 2018
> 19:01:35.422   113.7946111646366                        NaN
>                            414346.6042086262                         282
> 97.29319973242
> 27 Jun 2018
> 19:13:46.677   110.7761388040548                        NaN
>                            413486.9471883456                         282
> 97.30166332914
> 27 Jun 2018
> 19:24:48.083   108.217464063449                         NaN
>                            412653.1299510594                         282
> 97.3093184835
> 27 Jun 2018
> 19:33:38.926   106.2647394891434                        NaN
>                            411942.9592179462                         282
> 97.31546249967
> 27 Jun 2018
> 19:41:30.141   104.5965376382924                        NaN
>                            411280.9274945419                         282
> 97.32091637599
> 27 Jun 2018
> 19:48:27.000   103.1654945120115                        NaN
>                            410670.3271268641                         282
> 97.3257411411
> 27 Jun 2018
> 19:54:38.434   101.9214367116329                        NaN
>                            410107.171915261                          282
> 97.3300401459          	
>
> ........ (snip)
>
> Could please explain what am I doing wrong and I do not have an
> elevation calculation?
>
>
> Thanks in advance
> Apostolos - SV1LJJ
>
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions expressed
> are solely those of the author, and do not reflect the official views of AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb