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From: Matilde S. <ms...@lu...> - 2024-04-16 12:33:43
|
Hello GMAT team, Hope you are doing well. I am trying to do overpass predictions of a satellite constellation in 3 ground stations. I have successfully done it for 1 satellite and 1 ground station. Is there a way to do it for the whole constellation simultaneously without having to choose 1 satellite at a time in the Target field from the ContactLocator? Also, I want to consider the satellite field of view as a cone in a specific direction and with a specific angle. Is it possible to do that, too? Thank you in advance for your answers. Best regards, Matilde Simões Physics Engineer [cid:image001.png@01DA8FFE.086B0EF0] Rua Sarmento Beires, 31A 1900-411 Lisboa, Portugal Tel.: +351 21 116 50 20 Fax: +351 21 397 15 39 ms...@lu...<mailto:ms...@lu...> www.lusospace.com Matilde Simões ________________________________ Disclaimer and Confidentiality Notice: This message is confidential. It may also be privileged or otherwise protected by work product immunity or other legal rules. If you have received it by mistake, please let us know by e-mail reply and delete it from your system; you may not copy this message or disclose its contents to anyone. The integrity and security of this message cannot be guaranteed on the Internet. Pense no ambiente antes de imprimir este email. Please consider the environment before printing this email. |
From: Manolis P. <man...@sa...> - 2024-03-26 03:48:32
|
Good evening! Thank you for GMAT and the awesome work that you guys are doing 🙏 I am an astrodynamicist working with Saber Astronautics. I am interested in using GMAT programmatically as part of a containerized Java Spring Boot application. The GMAT API User Guide provides a few Java examples, but I have a few questions on how to set them up properly, specifically related to the loading of auxiliary data (e.g. eop file), but also on some missing members from the examples. There seems to be an abundance of Python and MATLAB examples, but not as much for Java. 1. On Windows, I have successfully managed to add the three jars to my build path, and configure my PATH such that the GMAT bin folder is added. In my code, I load the library by typing: System.load("C:\\Apps\\gmat-win-R2022a\\GMAT\\bin\\gmat_java.dll"); Then, I am able to run the following piece of code: TimeSystemConverter timeConverter = TimeSystemConverter.Instance(); timeConverter.SetLeapSecsFileReader(new LeapSecsFileReader()); double UTCepoch = 39000.000001; double TAIepoch = timeConverter.Convert(UTCepoch, TimeSystemConverter.UTC, TimeSystemConverter.TAI); However, the Java examples suggest using the member TimeSystemConverter timeConverter = gmat.theTimeSystemConverter; Am I loading the UTC-TAI file properly? Am I loading the dll library correctly? In the other Java examples, I cannot run gmat.Initialize() without crashing the JVM, and I find that I have to frequently cast all calls to gmat.Construct(). I feel I am using the Java API the wrong way. Is there a sample Java project that could get me started? Thank you once again in advance! Manny -- Like us on Facebook: www.facebook.com/SaberAstronautics <http://www.facebook.com/SaberAstronautics> *Confidentiality***** This email message and its attachments are subject to copyright and may contain privileged and confidential information intended for the recipient only. If this email is accidentally received by any person other than the recipient please return it to Saber Astronautics. immediately. If you are not the intended recipient please do not review, re-transmit or disseminate this message or any attachments. The views expressed in this email are those of the individual sender and may not reflect the views of Saber Astronautics. Saber Astronautics does not accept legal responsibility for the contents of this message or any attachments. Viruses causing any loss or damage are not Saber Astronautics responsibility. |
From: <mw...@gm...> - 2024-03-18 15:31:33
|
Does GMAT support orbit determination from ground based optical measurement (e.g. RA, DEC, and UTC)? I noted in the tutorial that it can from onboard satellite GPS or DSN radar measurements. The use case is amateur astronomy siting of asteroid, etc. from a ground based telescope. If not, what do you recommend for open source tools for doing that? Thanks. |
From: Cooley, D S. (GSFC-5950) <d.s...@na...> - 2024-03-16 19:35:02
|
Good afternoon, Glad to hear GMAT is working. The remaining errors you see are expected. They should go away once you setup Matlab and python. See the "Matlab Interface" and "Python Interface" section of the UG (docs/help.pdf) for details. If you are not interested in using Matlab and python, GMAT should work fine as-is. Regards, Steve From: mw...@gm... <mw...@gm...> Sent: Friday, March 15, 2024 11:18 AM To: Cooley, D S. (GSFC-5950) <d.s...@na...>; gma...@li... Cc: Milner, Barbara C. (GSFC-5830) <bar...@na...>; 'Darrel J. Conway' <dj...@th...>; Slojkowski, Steven E. (GSFC-595.0)[OMITRON] <ste...@na...> Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows CAUTION: This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC. Actually, I see several couple of more errors when scroll up on the events window. Thanks for any help with what to do about these. [cid:image001.png@01DA77B7.7626B660] From: mw...@gm...<mailto:mw...@gm...> <mw...@gm...<mailto:mw...@gm...>> Sent: Friday, March 15, 2024 11:06 AM To: 'Cooley, D S. (GSFC-5950)' <d.s...@na...<mailto:d.s...@na...>>; gma...@li...<mailto:gma...@li...> Cc: 'Milner, Barbara C. (GSFC-5830)' <bar...@na...<mailto:bar...@na...>>; 'Darrel J. Conway' <dj...@th...<mailto:dj...@th...>>; 'Slojkowski, Steven E. (GSFC-595.0)[OMITRON]' <ste...@na...<mailto:ste...@na...>> Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows Thanks Steve. That worked. I had to put in full privileges in that directory. I got another error noted in the event window at bottom right at startup, as noted below. It seems to run with a sample Hohmann transfer script. Should I comment out this line in the startup file? Which line? Thanks again. [cid:image002.png@01DA77B7.7626B660] From: Cooley, D S. (GSFC-5950) <d.s...@na...<mailto:d.s...@na...>> Sent: Monday, March 11, 2024 2:22 PM To: mw...@gm...<mailto:mw...@gm...>; gma...@li...<mailto:gma...@li...> Cc: Milner, Barbara C. (GSFC-5830) <bar...@na...<mailto:bar...@na...>>; Darrel J. Conway <dj...@th...<mailto:dj...@th...>>; Slojkowski, Steven E. (GSFC-595.0)[OMITRON] <ste...@na...<mailto:ste...@na...>> Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows Good afternoon, I talked to some of my colleagues. Here are some ideas to try: 1. Get a fresh zip file from SourceForge, https://sourceforge.net/projects/gmat/files/latest/download 2. Download it to your documents directory. Make sure you have full write permissions there. (I think you should by default) 3. Unzip. 4. Make sure the directory specified in the error message exists. If not, create it yourself. 5. If you get that error after running a script, send us the script you used as well. Thanks, Steve From: mw...@gm...<mailto:mw...@gm...> <mw...@gm...<mailto:mw...@gm...>> Sent: Friday, March 8, 2024 4:46 PM To: Cooley, D S. (GSFC-5950) <d.s...@na...<mailto:d.s...@na...>>; gma...@li...<mailto:gma...@li...> Cc: Milner, Barbara C. (GSFC-5830) <bar...@na...<mailto:bar...@na...>> Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows CAUTION: This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC. Thanks Steve, Here are the screen shots for the error. This was after I move the files to my "documents" directory also. Any advice on where else to look to fix this? Thanks. [cid:image003.png@01DA77B7.7626B660] [cid:image004.png@01DA77B7.7626B660] From: Cooley, D S. (GSFC-5950) <d.s...@na...<mailto:d.s...@na...>> Sent: Friday, March 08, 2024 12:54 PM To: mw...@gm...<mailto:mw...@gm...>; gma...@li...<mailto:gma...@li...> Cc: Milner, Barbara C. (GSFC-5830) <bar...@na...<mailto:bar...@na...>> Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows Good afternoon, Thank you for your interest in GMAT! I am not familiar with that error message. Could it be related to write privileges to the C drive? Perhaps, you could install GMAT in your "documents" or other directory. If that doesn't work, can you send us more information about the error, perhaps including a screen snap of the error message received. Regards, Steve From: mw...@gm...<mailto:mw...@gm...> <mw...@gm...<mailto:mw...@gm...>> Sent: Thursday, March 7, 2024 5:48 PM To: gma...@li...<mailto:gma...@li...> Subject: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows CAUTION: This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC. Trying to install R2022a. When I try to run the GMAT application file after unzipping and putting the files onto the C drive I am getting an error message; "OTHER_POT_PATCH = C:\GMAT 2022\bin\..\data\gravity\other. I am using Windows 10 Pro. Not sure how to get around this. |
From: Tobias C. H. <to...@cp...> - 2024-03-16 12:55:02
|
Does GMAT support the specification of the rocket dynamics that carries the spacecraft? |
From: <mw...@gm...> - 2024-03-15 15:17:48
|
Actually, I see several couple of more errors when scroll up on the events window. Thanks for any help with what to do about these. From: mw...@gm... <mw...@gm...> Sent: Friday, March 15, 2024 11:06 AM To: 'Cooley, D S. (GSFC-5950)' <d.s...@na...>; gma...@li... Cc: 'Milner, Barbara C. (GSFC-5830)' <bar...@na...>; 'Darrel J. Conway' <dj...@th...>; 'Slojkowski, Steven E. (GSFC-595.0)[OMITRON]' <ste...@na...> Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows Thanks Steve. That worked. I had to put in full privileges in that directory. I got another error noted in the event window at bottom right at startup, as noted below. It seems to run with a sample Hohmann transfer script. Should I comment out this line in the startup file? Which line? Thanks again. From: Cooley, D S. (GSFC-5950) <d.s...@na... <mailto:d.s...@na...> > Sent: Monday, March 11, 2024 2:22 PM To: mw...@gm... <mailto:mw...@gm...> ; gma...@li... <mailto:gma...@li...> Cc: Milner, Barbara C. (GSFC-5830) <bar...@na... <mailto:bar...@na...> >; Darrel J. Conway <dj...@th... <mailto:dj...@th...> >; Slojkowski, Steven E. (GSFC-595.0)[OMITRON] <ste...@na... <mailto:ste...@na...> > Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows Good afternoon, I talked to some of my colleagues. Here are some ideas to try: 1. Get a fresh zip file from SourceForge, https://sourceforge.net/projects/gmat/files/latest/download 2. Download it to your documents directory. Make sure you have full write permissions there. (I think you should by default) 3. Unzip. 4. Make sure the directory specified in the error message exists. If not, create it yourself. 5. If you get that error after running a script, send us the script you used as well. Thanks, Steve From: mw...@gm... <mailto:mw...@gm...> <mw...@gm... <mailto:mw...@gm...> > Sent: Friday, March 8, 2024 4:46 PM To: Cooley, D S. (GSFC-5950) <d.s...@na... <mailto:d.s...@na...> >; gma...@li... <mailto:gma...@li...> Cc: Milner, Barbara C. (GSFC-5830) <bar...@na... <mailto:bar...@na...> > Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows CAUTION: This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC. Thanks Steve, Here are the screen shots for the error. This was after I move the files to my "documents" directory also. Any advice on where else to look to fix this? Thanks. From: Cooley, D S. (GSFC-5950) <d.s...@na... <mailto:d.s...@na...> > Sent: Friday, March 08, 2024 12:54 PM To: mw...@gm... <mailto:mw...@gm...> ; gma...@li... <mailto:gma...@li...> Cc: Milner, Barbara C. (GSFC-5830) <bar...@na... <mailto:bar...@na...> > Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows Good afternoon, Thank you for your interest in GMAT! I am not familiar with that error message. Could it be related to write privileges to the C drive? Perhaps, you could install GMAT in your "documents" or other directory. If that doesn't work, can you send us more information about the error, perhaps including a screen snap of the error message received. Regards, Steve From: mw...@gm... <mailto:mw...@gm...> <mw...@gm... <mailto:mw...@gm...> > Sent: Thursday, March 7, 2024 5:48 PM To: gma...@li... <mailto:gma...@li...> Subject: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows CAUTION: This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC. Trying to install R2022a. When I try to run the GMAT application file after unzipping and putting the files onto the C drive I am getting an error message; "OTHER_POT_PATCH = C:\GMAT 2022\bin\..\data\gravity\other. I am using Windows 10 Pro. Not sure how to get around this. |
From: <mw...@gm...> - 2024-03-15 15:05:59
|
Thanks Steve. That worked. I had to put in full privileges in that directory. I got another error noted in the event window at bottom right at startup, as noted below. It seems to run with a sample Hohmann transfer script. Should I comment out this line in the startup file? Which line? Thanks again. From: Cooley, D S. (GSFC-5950) <d.s...@na...> Sent: Monday, March 11, 2024 2:22 PM To: mw...@gm...; gma...@li... Cc: Milner, Barbara C. (GSFC-5830) <bar...@na...>; Darrel J. Conway <dj...@th...>; Slojkowski, Steven E. (GSFC-595.0)[OMITRON] <ste...@na...> Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows Good afternoon, I talked to some of my colleagues. Here are some ideas to try: 1. Get a fresh zip file from SourceForge, https://sourceforge.net/projects/gmat/files/latest/download 2. Download it to your documents directory. Make sure you have full write permissions there. (I think you should by default) 3. Unzip. 4. Make sure the directory specified in the error message exists. If not, create it yourself. 5. If you get that error after running a script, send us the script you used as well. Thanks, Steve From: mw...@gm... <mailto:mw...@gm...> <mw...@gm... <mailto:mw...@gm...> > Sent: Friday, March 8, 2024 4:46 PM To: Cooley, D S. (GSFC-5950) <d.s...@na... <mailto:d.s...@na...> >; gma...@li... <mailto:gma...@li...> Cc: Milner, Barbara C. (GSFC-5830) <bar...@na... <mailto:bar...@na...> > Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows CAUTION: This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC. Thanks Steve, Here are the screen shots for the error. This was after I move the files to my "documents" directory also. Any advice on where else to look to fix this? Thanks. From: Cooley, D S. (GSFC-5950) <d.s...@na... <mailto:d.s...@na...> > Sent: Friday, March 08, 2024 12:54 PM To: mw...@gm... <mailto:mw...@gm...> ; gma...@li... <mailto:gma...@li...> Cc: Milner, Barbara C. (GSFC-5830) <bar...@na... <mailto:bar...@na...> > Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows Good afternoon, Thank you for your interest in GMAT! I am not familiar with that error message. Could it be related to write privileges to the C drive? Perhaps, you could install GMAT in your "documents" or other directory. If that doesn't work, can you send us more information about the error, perhaps including a screen snap of the error message received. Regards, Steve From: mw...@gm... <mailto:mw...@gm...> <mw...@gm... <mailto:mw...@gm...> > Sent: Thursday, March 7, 2024 5:48 PM To: gma...@li... <mailto:gma...@li...> Subject: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows CAUTION: This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC. Trying to install R2022a. When I try to run the GMAT application file after unzipping and putting the files onto the C drive I am getting an error message; "OTHER_POT_PATCH = C:\GMAT 2022\bin\..\data\gravity\other. I am using Windows 10 Pro. Not sure how to get around this. |
From: Cooley, D S. (GSFC-5950) <d.s...@na...> - 2024-03-11 18:37:23
|
Good afternoon, I talked to some of my colleagues. Here are some ideas to try: 1. Get a fresh zip file from SourceForge, https://sourceforge.net/projects/gmat/files/latest/download 2. Download it to your documents directory. Make sure you have full write permissions there. (I think you should by default) 3. Unzip. 4. Make sure the directory specified in the error message exists. If not, create it yourself. 5. If you get that error after running a script, send us the script you used as well. Thanks, Steve From: mw...@gm... <mw...@gm...> Sent: Friday, March 8, 2024 4:46 PM To: Cooley, D S. (GSFC-5950) <d.s...@na...>; gma...@li... Cc: Milner, Barbara C. (GSFC-5830) <bar...@na...> Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows CAUTION: This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC. Thanks Steve, Here are the screen shots for the error. This was after I move the files to my "documents" directory also. Any advice on where else to look to fix this? Thanks. [cid:image001.png@01DA73BF.72FD4680] [cid:image002.png@01DA73BF.72FD4680] From: Cooley, D S. (GSFC-5950) <d.s...@na...<mailto:d.s...@na...>> Sent: Friday, March 08, 2024 12:54 PM To: mw...@gm...<mailto:mw...@gm...>; gma...@li...<mailto:gma...@li...> Cc: Milner, Barbara C. (GSFC-5830) <bar...@na...<mailto:bar...@na...>> Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows Good afternoon, Thank you for your interest in GMAT! I am not familiar with that error message. Could it be related to write privileges to the C drive? Perhaps, you could install GMAT in your "documents" or other directory. If that doesn't work, can you send us more information about the error, perhaps including a screen snap of the error message received. Regards, Steve From: mw...@gm...<mailto:mw...@gm...> <mw...@gm...<mailto:mw...@gm...>> Sent: Thursday, March 7, 2024 5:48 PM To: gma...@li...<mailto:gma...@li...> Subject: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows CAUTION: This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC. Trying to install R2022a. When I try to run the GMAT application file after unzipping and putting the files onto the C drive I am getting an error message; "OTHER_POT_PATCH = C:\GMAT 2022\bin\..\data\gravity\other. I am using Windows 10 Pro. Not sure how to get around this. |
From: <mw...@gm...> - 2024-03-08 21:46:38
|
Thanks Steve, Here are the screen shots for the error. This was after I move the files to my "documents" directory also. Any advice on where else to look to fix this? Thanks. From: Cooley, D S. (GSFC-5950) <d.s...@na...> Sent: Friday, March 08, 2024 12:54 PM To: mw...@gm...; gma...@li... Cc: Milner, Barbara C. (GSFC-5830) <bar...@na...> Subject: RE: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows Good afternoon, Thank you for your interest in GMAT! I am not familiar with that error message. Could it be related to write privileges to the C drive? Perhaps, you could install GMAT in your "documents" or other directory. If that doesn't work, can you send us more information about the error, perhaps including a screen snap of the error message received. Regards, Steve From: mw...@gm... <mailto:mw...@gm...> <mw...@gm... <mailto:mw...@gm...> > Sent: Thursday, March 7, 2024 5:48 PM To: gma...@li... <mailto:gma...@li...> Subject: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows CAUTION: This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC. Trying to install R2022a. When I try to run the GMAT application file after unzipping and putting the files onto the C drive I am getting an error message; "OTHER_POT_PATCH = C:\GMAT 2022\bin\..\data\gravity\other. I am using Windows 10 Pro. Not sure how to get around this. |
From: Cooley, D S. (GSFC-5950) <d.s...@na...> - 2024-03-08 17:54:19
|
Good afternoon, Thank you for your interest in GMAT! I am not familiar with that error message. Could it be related to write privileges to the C drive? Perhaps, you could install GMAT in your "documents" or other directory. If that doesn't work, can you send us more information about the error, perhaps including a screen snap of the error message received. Regards, Steve From: mw...@gm... <mw...@gm...> Sent: Thursday, March 7, 2024 5:48 PM To: gma...@li... Subject: [EXTERNAL] [BULK] [Gmat-users] Missing Directory upon Install - Windows CAUTION: This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC. Trying to install R2022a. When I try to run the GMAT application file after unzipping and putting the files onto the C drive I am getting an error message; "OTHER_POT_PATCH = C:\GMAT 2022\bin\..\data\gravity\other. I am using Windows 10 Pro. Not sure how to get around this. |
From: <mw...@gm...> - 2024-03-07 22:47:57
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Trying to install R2022a. When I try to run the GMAT application file after unzipping and putting the files onto the C drive I am getting an error message; "OTHER_POT_PATCH = C:\GMAT 2022\bin\..\data\gravity\other. I am using Windows 10 Pro. Not sure how to get around this. |
From: Cooley, D S. (GSFC-5950) <d.s...@na...> - 2024-02-27 01:08:34
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Good evening, Thank you for your interest in GMAT. GMAT R2022a has some new TLE capabilities (some of which are Alpha only). If you haven’t done so already, take a look at the R2022a Release notes in the User Guide for the names of some sample scripts that you can review. (docs\help\help-letter.pdf). I paste some of these notes below: [cid:image001.png@01DA68ED.752F1A50] [cid:image002.png@01DA68ED.752F1A50] Hope this helps. Regards, Steve Cooley From: 이순승 <123...@is...> Sent: Monday, February 26, 2024 12:46 AM To: gma...@li... Subject: [EXTERNAL] [BULK] [Gmat-users] about using TLE as Sat Orbit element CAUTION: This email originated from outside of NASA. Please take care when clicking links or opening attachments. Use the "Report Message" button to report suspicious messages to the NASA SOC. Hi I am one of university student in South Korea using the GMAT 2022a version. and I am grateful to you guys. you know it's a very useful tool. but I am a bit disappointed that I cannot use TLE directly. so I am wondering if there is a way to easily use TLE in GMAT. I would appreciate it if you could provide me with some information on the following: Is there a way to use TLE directly in GMAT 2022a? If not, are there any workarounds or alternative tools that I can use to achieve the same functionality as TLE? Thank you for your time and consideration. Sincerely |
From: 이순승 <123...@is...> - 2024-02-26 06:42:26
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Hi I am one of university student in South Korea using the GMAT 2022a version. and I am grateful to you guys. you know it's a very useful tool. but I am a bit disappointed that I cannot use TLE directly. so I am wondering if there is a way to easily use TLE in GMAT. I would appreciate it if you could provide me with some information on the following: Is there a way to use TLE directly in GMAT 2022a? If not, are there any workarounds or alternative tools that I can use to achieve the same functionality as TLE? Thank you for your time and consideration. Sincerely |
From: Prakhar T. <pra...@gm...> - 2024-02-24 15:08:32
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Hi, I'm working on a project for which I'm using the GMAT 2022a version on my OS- Manjaro (arch-linux). I'm using the Python API for accessing the required classes and objects of GMAT. I could successfully create a spacecraft, add force models, and propagate it, but couldn't plot its ground track. I came across a module- GroundTrackPlot, which is apparently used for plotting the ground track of satellites, but I'm not able to decipher how to use it in Python. Also, it's nowhere mentioned in the user documentation in the 2022a release. I'd be extremely grateful if you could help me in this situation. Thanks in advance! : ) Warm regards, Prakhar Tomar SC20B040 B.Tech in Aerospace Engineering Indian Institute of Space Science and Technology Email: pra...@gm..., pra...@ug... |
From: Dirgh B. <dir...@gm...> - 2024-02-24 09:14:25
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Hello Sir/Ma'am, I'm Dirgh Bhatt, from India. I have been using GMAT for sometime now. I am currently working on a project that deals with Two-Line Element sets. I observed that GMAT gives output in frame other TEME reference frame (as used by TLE). I wanted to know how GMAT does the transformation from TEME reference frame to J2000. It would be great help if you could provide me with the algorithm that GMAT implies and any reference that might be helpful for my understanding. Thanks and Regards Dirgh Bhatt |
From: <184...@qq...> - 2024-02-22 07:41:20
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hello devs and guys, i have to report a qusetion.Does somebody know why? when i try to set a finiteburn to simulate the Centaur Upper Stage,it said its thrust is unphysical,it seems like in chemicalthrust,C1 can't greater than 11000N,but the Centaur Upper Stage 's thrust is 21200 N,i don't know why? could you guys help me? thanks! |
From: Mike V. <kmm...@gm...> - 2024-02-19 07:57:44
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Dear all, I have been trying to load, initialize, and run a GMAT-script using the provided Python API: import gmat_py as gmat # the one in the *R2022a/bin/gmatpy/_py38/* folder gmat.LoadScript('/home/m07/Desktop/MSE/THESIS/RACCOON/Scripts/Optimization/test.script') gmat.Initialize() gmat.ShowObjects() gmat.RunScript() The script contains subscribers and event locators, such as: - OrbitView - OpenFramesInterface - ReportFile - GroundTrackPlot - XYPlot - ContactLocator For the subscribers, the only informative error description I get is: > *APIException: Subscriber Exception: > Subscriber::SetActualWrapperReference() "XYPlot1" failed to set reference > for object named "cubesat1.UTCModJulian." The wrapper is NULL.* > Notice the dot symbol at the "*cubesat1.UTCModJulian*", it doesn't exist in the script. Once I delete the related block of code in the GMAT-script, the following error is thrown for every other subscriber as well. The exception message is contained in the *R2022a/plugins/libEventLocator.so *shared library. Once I get rid of the subscriber section in the GMAT-script, I get the ContactLocator errors: > *APIException: Event Exception Thrown: Error setting observers on > ContactLocator Contact_Sat1_GS1. All observers must be either ground > stations or spacecraft. * In the GMAT-script, a contact locator refers to a spacecraft as an observed object (Target) and a ground station as an observer. When run via GMAT GUI, the script successfully finishes, all report files are generated, plots and 3-D visualization rendered alright. These issues prevent me from trying optimization Python codes in pair with GMAT. How could I solve this? Thank you in advance. Best regards, Mike |
From: Tobias C. H. <tc...@gm...> - 2024-01-28 16:14:26
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Hi, this URL https://gmat.atlassian.net/wiki/spaces/GW/overview points to this Release Notes URL: https://gmat.sourceforge.net/docs/R2022a/help.html#ReleaseNotesR2022a But it seems broken. Also where to find the tutorials as mentioned here: https://gmat.atlassian.net/wiki/spaces/GW/pages/380273265/User+Documentation Best wishes, Toby |
From: Tobias C. H. <tc...@gm...> - 2024-01-28 15:11:16
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Hi, I just downloaded the tar.gz file of GMAT. Moved in to the bin folder. Issued the command with the error message below ... can anyone help here? tocohi@laptop:~/Downloads/GMAT/R2022a/bin$ ./GmatConsole & tocohi@laptop:~/Downloads/GMAT/R2022a/bin$ ******************************************** *** GMAT Console Application ******************************************** General Mission Analysis Tool Console Based Version Build Date: Jan 10 2023 15:04:14 Moderator is updating data files... Moderator is creating core engine... libpython3.9.so.1.0: cannot open shared object file: No such file or directory *** Library "../plugins/libPythonInterface_py39" did not open. libmex.so: cannot open shared object file: No such file or directory *** Library "../plugins/libMatlabInterface" did not open. Skipping "../plugins/libOpenFramesInterface": GUI plugins are skipped in console mode Successfully set Planetary Source to use: DE405 Successfully set Planetary Source to use: DE405 Successfully set Planetary Source to use: DE405 Setting nutation file to ../data/planetary_coeff/NUTATION.DAT Setting leap seconds file to ../data/time/tai-utc.dat 2024-01-28 15:42:29 GMAT Moderator successfully created core engine Enter a script file, q to quit, or an option: |
From: Goettl, F. <fra...@ai...> - 2024-01-25 12:02:26
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Airbus Amber Hello, I could not find out which tide model is used in GMAT. I would love to apply the IERS TN36 elastic solid Earth tide model up to degree and order 4 as well as the IERS TN36 solid Earth pole tide model up to degree and order 2. I set up the following tide file: % GMAT solid Earth tide model for EGM2008.cof gravity model % k 2 0 0.29525 k 2 1 0.29470 k 2 2 0.29801 k 3 0 0.093 k 3 1 0.093 k 3 2 0.093 k 3 3 0.094 kplus 0 -0.00087 kplus 1 -0.00079 kplus 2 -0.00057 But the effect due to the tides does not look like I expected it. Which models are applied in GMAT? I could not find this in the web. Furthermore I tried to apply SRP but I could not figure out how to set up a SPAD file. What relativistic model is used in GMAT? Thank you for your help. With kind regards Franziska Göttl This Item has been reviewed and was determined as not listed under German regulation, nor EU export controls, nor U.S. export controls. However, in the case of the item has to be resold, transferred, or otherwise disposed of to an embargoed country, to an end user of concern or in support of a prohibited end use, you may be required to obtain an export license. The information in this e-mail is confidential. The contents may not be disclosed or used by anyone other than the addressee. Access to this e-mail by anyone else is unauthorised. If you are not the intended recipient, please notify Airbus immediately and delete this e-mail. Airbus cannot accept any responsibility for the accuracy or completeness of this e-mail as it has been sent over public networks. If you have any concerns over the content of this message or its Accuracy or Integrity, please contact Airbus immediately. All outgoing e-mails from Airbus are checked using regularly updated virus scanning software but you should take whatever measures you deem to be appropriate to ensure that this message and any attachments are virus free. |
From: Mike V. <kmm...@gm...> - 2024-01-07 00:23:54
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Hello everyone, I congratulate all of you on the beginning of this new year! I have a question on how to scroll back graphical output for simulated propagations with having trajectory and ground track lines also rewound. As for now, when I replay long (30-plus-days duration) animation, trajectory and ground track do not (completely) disappear. Instead, it replays as if I launched the animation somewhere from the half of the simulated timeline. I am attaching screenshots as the illustrations. There are no interface buttons in GUI (R2022a distribution for Linux) to do that and I haven't noticed any corresponding options in settings for both OpenFrames and OrbitView outputs. Is there any way to rewind animation back to a "clean" view? The documentation shipped with the GMAT distribution doesn't contain exhaustive information for this case, although it gives a lot of useful explanation in other (general) cases. I apologise if this a duplicated question and it had already been answered in the past, but I could not find that while searching through the emails history on GMAT's SourceForge page, wiki and issues tracker on Atlassian, and OpenFramesInterface's Gitlab page. P.S. I would also appreciate it if someone shares info on Python API for OpenFramesIterface functionality, if that has been implemented. Best regards, Mike |
From: Mike V. <kmm...@gm...> - 2023-12-15 10:19:44
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Hello Bogdan, Thank you for reaching out to me. I would gladly take a look at the conference paper, if it's publicly available. Best regards, Mike On Wed, 13 Dec 2023, 21:06 Bogdan Udrea, <bog...@vi...> wrote: > Aloha Mike, > > > > I have implemented a simulator similar to the one you mention for a NASA > project but in Orekit https://www.orekit.org/. I am still teaching myself > GMAT and plan to, eventually, convert it to GMAT and maybe slap a nice GUI > on it. > > > > If you’d like to find out more I, I can send you a conference paper that I > wrote about it. If you’d like to chat about it, please let me know as well. > > > > Best regards, > > > > BU > > > > *From:* Mike Vasovsky <kmm...@gm...> > *Sent:* Monday, December 11, 2023 18:05 > *To:* gma...@li...; > gma...@li... > *Subject:* [Gmat-users] Payload ejection simulation > > > > Hello all, > > > > > > I've been trying to simulate a mission where a separated dispenser ejects > cubesats. > > Now, I am trying to formulate this setting in GUI, but cannot figure out > anything else besides just having cubesats to start flying with different > initial epochs and true anomalies. > > > > My main interest here is to simulate the flight of the ejected cubesats > right after their ejection out of the dispenser. > > > > Is there any other way to accomplish this idea in GMAT? > > > > Best regards, > > Mike > |
From: Bogdan U. <bog...@vi...> - 2023-12-13 22:13:59
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Aloha Mike, I have implemented a simulator similar to the one you mention for a NASA project but in Orekit https://www.orekit.org/. I am still teaching myself GMAT and plan to, eventually, convert it to GMAT and maybe slap a nice GUI on it. If you’d like to find out more I, I can send you a conference paper that I wrote about it. If you’d like to chat about it, please let me know as well. Best regards, BU From: Mike Vasovsky <kmm...@gm...> Sent: Monday, December 11, 2023 18:05 To: gma...@li...; gma...@li... Subject: [Gmat-users] Payload ejection simulation Hello all, I've been trying to simulate a mission where a separated dispenser ejects cubesats. Now, I am trying to formulate this setting in GUI, but cannot figure out anything else besides just having cubesats to start flying with different initial epochs and true anomalies. My main interest here is to simulate the flight of the ejected cubesats right after their ejection out of the dispenser. Is there any other way to accomplish this idea in GMAT? Best regards, Mike |
From: Mike V. <kmm...@gm...> - 2023-12-12 03:59:09
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Hello all, I've been trying to simulate a mission where a separated dispenser ejects cubesats. Now, I am trying to formulate this setting in GUI, but cannot figure out anything else besides just having cubesats to start flying with different initial epochs and true anomalies. My main interest here is to simulate the flight of the ejected cubesats right after their ejection out of the dispenser. Is there any other way to accomplish this idea in GMAT? Best regards, Mike |
From: <jea...@fe...> - 2023-12-02 04:35:38
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I am attempting to identify and model the behaviour of a geostationary satellite using GMAT based on high accurate time ranging collected every two hours. GMAT is able to read the script strongly inspired from Tutorial 14 Orbit Estimation using DSN Range and Doppler Data except my GMD file only includes (Two-Way) Range information (the available data). When executing this script with GMAT R2022a (pre-compiled version for Ubuntu) I get the error message: Utility Exception: Warning: GMAT does not support parabolic orbits in conversion from Cartesian to Keplerian state. Is this related to the lack of velocity observation? Or did I make another mistake in my processing script? I cannot find any reference to this error when searching. The "sample.gmd" is only a sample of the much larger "satre.gmd" referred to in the processing script. Thanks. |