# Tag Info

### Object slowest at periapsis - despite correct position calculation

If I understand correctly, your $p, q$ are essentially cartesian coordinates, and you're trying to get the velocity components in those two orthogonal directions. However, you're taking the derivative ...
• 149k
Accepted

• 75k

### Integration of Varying Forces, Impulses in Simulators

Now I'm using an RK4 integrator, (1st case) we assume that the forces are uniform all throughout one integration time step. (is this correct?) That is not correct. The point of using a multiple stage ...
• 75k

### What does a "handover" really mean in satellite communications?

In general, handovers happen when a device that has single upstream connection switches between access points that are serving multiple devices each. In mobile telephones, your phone does a handover ...
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### Difference in using flat earth or round earth model for equation of motion

Spherical geometry is quite different than cartesian trigonometry.. the sum of all angles in a triangle can be up to 540°, distances are different etc. particular the initial choice of flight angle w....

### How to simulate the environment of the moon for rovers on earth?

Parts of the rover, such as the suspension, drive train, and autonomous decision making, navigation, and obstacle avoidance capabilities can tested by creating a multi-physics model of the rover and ...
• 6,186
1 vote

### What are some best practices for coding a satellite orbit propagator and ground track plotter?

For anyone interested, here's what I have for now: https://satellite-propagator.vercel.app/ I'm still building out most of the features I want it to have (and a lot of it is unfinished, along with ...
• 121
1 vote

### Integration of Varying Forces, Impulses in Simulators

Here's a theory I have about how one could implement an impulse with an RK4 integrator. I believe the formal answer is that the force can be expressed as F(t). The right way to apply an RK4 is to ...
1 vote

### How to get contact locator events in GMAT using Python

I am trying to do the same thing, so if you have found an answer please post it! One method that does work is to generate and run a script using the gmat objects, so I am doing: - ...
1 vote

### Difference in using flat earth or round earth model for equation of motion

I'll dip my toe into the quicksand and try not fall in. Spaceflight math dates back to the era of pocket protectors and slide rules. If you needed more digits to say multiply or take a square root, ...
• 149k

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