Error loading TLE file into satellite object

8 次查看（过去 30 天）
jose nuñez
jose nuñez 2024-1-24
评论： Andrew Mihalik 2024-7-23
I'm creating a GPS scenario loading current TLE into the satellite object with following commands:
% Create Scenario
startTime = datetime('now', 'Format', 'yyyy-MM-dd HH:mm:ss');
stopTime = startTime;
sampleTime = 1; % secs
sc = satelliteScenario(startTime,stopTime,sampleTime);
% Load TLE
websave('tledata.tle', 'https://celestrak.org/NORAD/elements/gp.php?GROUP=gps-ops&FORMAT=tle');
% Put satellites into the scenario
sats = satellite(sc,'tledata.tle');
But I obtain following error:
Error using satelliteScenario/satellite>throwExceptions
Unable to add satellite to the satelliteScenario.
Error in satelliteScenario/satellite
Caused by:
Incorrect size for expression 'time.fmt': expected [1x0] but found [1x19].
Has anyone an idea on what's going on? TLE file seems to be OK.
  1 个评论
Andrew Mihalik
Andrew Mihalik 2024-7-23
Hello, if we assume I ran the following code:
sc = satelliteScenario;
StartTime_datestring= '2024-07-22 17:52:39'
StopTime_datestring= '2024-08-23 17:52:39'
Can anyone explain why, then, this code executes correctly and without error:
StartTime_datetime=datetime(StartTime_datestring,'InputFormat','yyyy-MM-dd HH:mm:ss');
StopTime_datetime=datetime(StopTime_datestring,'InputFormat','yyyy-MM-dd HH:mm:ss');
sc.StartTime=StartTime_datetime
sc.StopTime=StopTime_datetime
But this code:
StartTime_datetime=datetime(StartTime_datestring,'Format','yyyy-MM-dd HH:mm:ss');
StopTime_datetime=datetime(StopTime_datestring,'Format','yyyy-MM-dd HH:mm:ss');
sc.StartTime=StartTime_datetime
sc.StopTime=StopTime_datetime
creates an error saying Incorrect size for expression 'time.fmt': expected [1x0] but found [1x19].

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Varun
Varun 2024-1-29
Hi Jose,
Looks like the error is related to the size of the 'time.fmt' field in the TLE file. The expected size is [1x0], but the error indicates that it found [1x19].
I debugged the code and found that the error is occurring due to the first line because of using ‘Format’ name-value pair in the ‘datetime’ function:
startTime = datetime('now', 'Format', 'yyyy-MM-dd HH:mm:ss');
To resolve this error, you can simply replace this line with the following line which is independent of ‘Format’ name-value pair:
startTime = datetime('now');
Please refer to the following documentations to learn more:
‘datetime’: https://www.mathworks.com/help/matlab/ref/datetime.html
‘satelliteScenario’: https://www.mathworks.com/help/aerotbx/ug/satellitescenario.html
Hope it helps.
  2 个评论
Andrew Mihalik
Andrew Mihalik 2024-7-23
Hello, if we assume I ran the following code:
sc = satelliteScenario;
StartTime_datestring= '2024-07-22 17:52:39'
StopTime_datestring= '2024-08-23 17:52:39'
Can anyone explain why, then, this code executes correctly and without error:
StartTime_datetime=datetime(StartTime_datestring,'InputFormat','yyyy-MM-dd HH:mm:ss');
StopTime_datetime=datetime(StopTime_datestring,'InputFormat','yyyy-MM-dd HH:mm:ss');
sc.StartTime=StartTime_datetime
sc.StopTime=StopTime_datetime
But this code:
StartTime_datetime=datetime(StartTime_datestring,'Format','yyyy-MM-dd HH:mm:ss');
StopTime_datetime=datetime(StopTime_datestring,'Format','yyyy-MM-dd HH:mm:ss');
sc.StartTime=StartTime_datetime
sc.StopTime=StopTime_datetime
creates an error saying Incorrect size for expression 'time.fmt': expected [1x0] but found [1x19].

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Satellite Mission Analysis 的更多信息

标签

产品


版本

R2023b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by