Initial Orbit Determination Scope Functions

bool Go()

Use this to run the IOD process.

Return Value

bool A Boolean that is true if the IOD process runs

Example VBS:

Copy 
bSuccess = sc.Satellite(0).InitialOrbitDetermination(0).Go

bool Transfer()

Use this to transfer the IOD solution to the parent satellite.

Return Value

bool A Boolean that is false if there is no solution for it to transfer

Example VBS:

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bSuccess = sc.Satellite(0).InitialOrbitDetermination(0).Transfer

bool SelectMeasurementsByTime(see below)

Two functions assist in setting IOD input measurements programmatically:

  • HerrickGibbsIODObject.Method.SelectMeasurementsByTime("time1","time2","time3")

  • AnglesOnlyIODObject.Method.SelectMeasurementsByTime("time1","fac1","time2","fac2","time3","fac3")

Both functions return a Boolean indicating if they were successfull in setting all three measurements at requested times.

By default, if no fractional seconds are provided, times are matched to the nearest 0.5 sec. If you specify additional digits — up to three more — the function increases the matching precision by a factor of ten:

Input -> Precision

13:05:08 -> 0.5 sec

13:05:08.1 -> 0.05 sec

13:05:08.11 -> 0.005 sec

13:05:08.111 -> 0.0005 sec

Parameters

time1, time2, time3 string The date and times of the three measurements
fac1, fac2, fac3 string The facilities of the three measurements

Return Value

bool A Boolean indicating success or not

Example VBS:

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iod1method = ODTK.Scenario(0).Sat1.IOD1HG.Method
r1 = iod1method.SelectMeasurementsByTime("13 Aug 2012 13:00:00", _
                                         "13 Aug 2012 13:02:00", _
                                         "13 Aug 2012 13:06:00")
alert r1

iod2method = ODTK.Scenario(0).Sat1.IOD2AO.Method
r2 = iod2method.SelectMeasurementsByTime("13 Aug 2012 13:01:00", _
                                         "Fac1", _
                                         "13 Aug 2012 13:02:00", _
                                         "Fac2", _
                                         "13 Aug 2012 13:04:00", _
                                         "Fac3")
alert r2