In a GNC scheme (Guidance, Navigation and Control). The N(avigation) module feeds the G and the C.
It does not matter the supernice is your controller or guidance if your estimations are far from the actual values."
about TRIAD, you can download the dcm_estimation.pdf. The implementation in Matlab is quite straightforward, you only have to type literally what is in the equations, there is not black magic.
Recently the Kalman Filter entry at…"
All filters (transfer functions) introduces lag (phase delay), and in a closed loop, this lag can lead to instabilty of the closed loop system.
One thing is that the lag introduced don't lead to the instability, which as well depends on your…"
3-5 times the amplitude mmmm, maybe you are measuring aliasing right? if you are sampling at 50Hz. I am interested in your experiments as I want to try more isolation techniques. Do you mind to share them? :P"
you are right, this is only a high level guidance algorithm. Actually, I wrote an algorithm based on TVFG (when I am inside the circumference, I put a "mirror" of the vehicle outside to compute the "tangent" point).
I applied it…"
"By the way, all the simulations are without perturbations. What would happen if the vehicle goes within the circunference?
I did a similar algorithm that resolves that case, actually the algorithm is very similar and I explained with simpler maths.…"
In many many research papers, I always wonder why they refer an UAV something that it is NOT clearly an air vehicle (check out the equation 2 u_U). For instance, they add wind but they do not care about the sideslip angle in the control.…"
"Yeah of course,
but if you are going to develop new navigation algorithms relying on raw data (served at fixed sample time), keep in mind that the results will be false.
Another issue to keep in mind (that happened to me). If you stress the HW to…"
I guess we are messing concepts here. By definition, for a HIL system in hard-real time dealing with fixed discrete time systems (like our autopilots), the host (X-Plane) shall guarantee this requirement throughout the simulation. But…"
In my experience, X-Plane is not a "good" platform for testing avionics, this is not a real time software and it normally does not run in a hard-real time machine neither. You can not employ control techniques…"