The Navigation Equations: Computing Position North, East, and Down

[@ChristopherLum]

In case it is helpful, here are all the Flight Mechanics videos in a single playlist kzbin.info/aero/PLxdnSsBqCrrEx3A6W94sQGClk6Q4YCg-h. You can support this channel via Patreon at www.patreon.com/christopherwlum. Please let me know what you think in the comments. Thanks for watching!

[@jordantriolo571]

AE512: Nice video, I'm glad that gamma has finally been properly redefined

[@zhc3404]

Aha!This world is better becaues of you!

[@ChristopherLum]

Glad you like it. There are other Flight Mechanics videos on the channel. Please feel free to check them out and let me know what you think. Thanks for watching!

[@milesrobertroane955]

AA516: Good video! It is cool to see the Matlab implementation matches what we came up with

[@daniellerogers5959]

AA516 - Best, concise explanation for the differentiation between course and heading angle, thank you!

[@davidtelgen8114]

AE512: That mathworks 6DOF model is super well organized under the mask, I can never make my models look that neat!

[@aimeepak717]

AE512: I like how we are seeing the NED frame positions coming back from the beginning of the class!

[@tomgoodwin9161]

What I was looking for is the formula to find a location NORTH, EAST/ WEST SOUTH. It has been 52 years since I have had to do it. When last I had to, there was no GPS available. We called it the NEWS formula.

[@chayweaver.2995]

AE512: Nice to see the NED making a comeback from the first class video

[@edwardmau5877]

AE 512: The drawing of the simulink model helped the discussion. It was nice to see the model and the derivations at the same time on the board.

[@anthonysu1712]

I appreciate it so much every time you put those helpful tips on common pitfalls! E.g. the hDot = -down, the pros and cons of the two MATLAB implementations, etc. are very helpful.

[@zaneyosif]

AE512: Interesting discussion about how to manipulate the outputs of the RCAM state vector. 48:26 makes me think that it might be better to keep the state vector as the 9 states and have a separate function to implement the navigation equations so that we wouldn't have to affect the trim algorithms that we have developed before.

[@sethwhittington28]

AE512: error at 37:30? 3 element vector is velocity in each axis of NED frame, not position?

[@hamasahmad3751]

hi can anyone plz send me this model i am stuck after the 6 DOF model with 9 states , but i need this

[@yaffetbedru6612]

AA516: Thanks for the video!

[@petermay6090]

AA516: Useful and concise video!

[@metehanaltnok936]

you said you made some augmentations and modifications on rcam model Can you share this in the video ?

[@sethreed6088]

A A 516, Thank you Professor Lum for a great quarter. This was probably my favorite class that I have taken. These videos are so well documented and organized which really helped me learn all about building the resulting flight sim. Thanks!

[@ChristopherLum]

Seth, I'm glad you enjoyed the class, it was a pleasure having you in the class, I hope our paths cross again in the future!

[@berkinan1496]

Hi. What is the climb angle formula reference book? I need to study this book. Pls help me!

[@ChristopherLum]

Hi, Thanks for reaching out, I'm glad you enjoyed the video. Unfortunately I'm unable to respond to questions on KZbin due to the sheer volume of inquiries that I receive. That being said, I hope you'll consider supporting the channel via Patreon at www.patreon.com/christopherwlum or via the 'Thanks' button underneath the video as I'll be able to answer questions there. Given your interest in the topic, I'd love to have you as a Patron as I'm able to talk/interact personally with Patrons. Thanks for watching! -Chris

[@marcosszmania5874]

AE 512 - Hi Professor Lum. Minute 44:07 -> Your "simUIn" is a "From WorkPlace" block? is it a two-column matrix with time inputs on first column and value inputs on second column? How could I create my simUIn? Thanks.

[@yifuwang1807]

Hi Marcos, it is a From Workspace block and you can find it under Simulink Library Browser >> Simulink/Sources. To input data, use simUIn.time and simUIn.signals.values in MATLAB.

[@SomeTechGuy666]

My goodness, the object orientated dissection of these problems make them so much easier to understand.

[@ChristopherLum]

Hi TechGuy, it seems that you are working your way through the Flight Mechanics playlist, thanks for all the comments and for watching!

[@SomeTechGuy666]

Fantastic video.

[@yemaneabera1828]

it was so helpfull...pls keep it up. and pls would you pass me through the link for 1. wind Tunnel Testing And Data Reduction 2. The Flat Earth Equations of Motion for a Rigid Body

[@timproby7624]

[AE 512] 40:57 Don't you need to integrate PN PE PD coming out of the RCAM system to get positions? Based on the code you are outputting translational velocities in the NED frame, not positions?

[@ChristopherLum]

I think you mean VN, VE, VD. And in short this is correct, we are rotating u, v, w (which is in the body frame) to be VN, VE, VD and then integrating.

[@timproby7624]

@@ChristopherLum So the integration to get PN PE PD is happening underneath the 'RCAM' submodel mask?

[@SalmaAbdelaty]

Hello Prof. Christopher, I'd like to express my deep appreciation & gratitude for your videos, I've watched a couple of control videos and this video which helped me to make the scattered concepts clear & intuitive... I really hope those videos were released earlier... It's helping me with my graduation project.... I would really appreciate if you can build up on the flight dynamics videos and discuss Autopilot design especially the part of Guidance & path following controllers design for small UAVs ... I can't find clear & easy to grasp resources discussing them and it would be wonderful if you could discuss them soon... Thank you so much for all of your efforts.

[@ojasvikamboj6083]

A A 516: Ojasvi Kamboj

[@serhatsarhan8349]

Thank you for your valuable lessons. I hope you do consider sharing lessons which cover missiles, autopilots and guidance systems.

[@601106790]

Hello Prof. Christopher, so clear and detailed explaination!! Could you please share your lecture notes?

[@daviddevine2415]

AE512: If we add X(10), X(11), X(12) as P_N, P_E, P_D to the state vector inside the RCAM model, what do you suggest setting for initial conditions on these elements? I'm thinking (0,0,0) would be a good choice, since when we initialize (phi, lambda, h) as our starting LLA for the Simulink block Geodetic Integrator then the P_N, P_E, P_D evolutions will be relative to that LLA starting point. What do you think?

[@ChristopherLum]

David, yes [0;0;0] is fine. Or if you want some altitude try [0;0;-500];

[@Po-ChihHuang]

AA816:Po

[@soyluserdar]

Thank you for the great content!

[@halilhanc5176]

Sir when we change the output of RCAM as 12x1 matrix how do we have to change integrator's inital condition ?How 12 element matrix give feedback to RCAM function.It seems there is something wrong here.

[@jackmacleod-maclean4206]

I'm having a similar issue with the modification and the no. of input and exit ports not matching. Have you found a soluiton? Perhaps we can share code to try and work through it?

[@ucontrolchannel5967]

Thank youuu verryyy much

[@ChristopherLum]

You're welcome!

[@deepbluesee2213]

@@ChristopherLum could you share the modifications on rcam model? Thank you very much!