Lab 3: Verification of Lambert Solver Using STK
Lab 3: Verification of Lambert Solver Using STK
ASEN 5519
Run your Lambert solver, with a launch date of Aug. 5, 2005, and determine a good date to arrive at Mars.
Create a new scenario:
• Change the time span (under Properties: Basic) to match your Lambert inputs.
• Since your Lambert solver probably used Julian Date for input, you can change the date format in STK. Under Properties: Basic, click on the Units tab. Highlight DateFormat on the left. On the right, double-click Julian Date (JDate).
Create a new propagator, as follows:
• With Scenario highlighted, go to Tools: Astrogator Browser.
• On the left, click on the Propagator folder
• Click on Earth Point Mass, then click the Duplicate button
• Change the name to Sun Point Mass, and click OK
• Double-click on Sun Point Mass (which you just created)
• Change Central Body to Sun, Click OK, Exit Astrogator Browser.
Change your 2-D map central body to the Sun. Change the projection to Orthographic, Center Lat = 90 deg, Display Height = 500,000,000 km, change CBF to CBI.
Create two new planets
• With the first planet highlighted, go to Properties: Basic.
• Change Definition to Earth (check Auto-Rename box, if it isn’t already)
• Go to Properties: Graphics. Uncheck Inherit Settings. Check Show Inertial Position, Show Orbit, and Show Position Label. Uncheck remaining items.
• Do the same for second planet, except define it as Mars.
Create a new satellite
• Go to Properties: Basic. Change propagator to Astrogator
• For Initial State, change coord. system to Sun Centered Mean Ecliptic of J2000
• Insert Cartesian coordinates from your Lambert solution. Make sure your orbit epoch matches your input to your Lambert solver.
• Define a new propagate segment. Change propagator to Sun Point Mass (which you created earlier)
• Click Advanced… button, and uncheck max propagation time.
• Set duration to match your Lambert input (i.e. JDf – JDi). Click OK.
• Change satellite graphics properties to show all of orbit track.
View the results in the 2-D window and see if your satellite gets close to Mars.
Use the Access tool to determine how close you get to Mars (if you’re within a couple of hundred thousand kilometers of Mars, that’s actually pretty good).
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