Search found 13 matches

by alexpic
Thu Feb 15, 2018 3:39 pm
Forum: Loco Positioning System
Topic: Crazyflie-LPS anchor synchronization in TWR protocol
Replies: 4
Views: 2676

Re: Crazyflie-LPS anchor synchronization in TWR protocol

Hi Arnaud,
now all is more clear! Thank you for the help!!! :D
Alex
by alexpic
Thu Feb 15, 2018 10:59 am
Forum: Loco Positioning System
Topic: Crazyflie-LPS anchor synchronization in TWR protocol
Replies: 4
Views: 2676

Re: Crazyflie-LPS anchor synchronization in TWR protocol

Hi Arnaud, Thank you for your reply!! The TX and RX timestamps are measured by the anchor and communicated back to the Crazyflie in the last packet of the sequence. So all the times (so the timestamps) are managed by the anchor, and those times (pollTx, pollRx, answeTx, answerRx, finalTx and final R...
by alexpic
Wed Feb 14, 2018 3:03 pm
Forum: Loco Positioning System
Topic: Crazyflie-LPS anchor synchronization in TWR protocol
Replies: 4
Views: 2676

Crazyflie-LPS anchor synchronization in TWR protocol

Hi everybody, I’m studying the communication between Crazyflie and LPS anchor in TWR protocol, and i have just a simple question: how are sychronized the crazyflie and the anchors? I’ve seen that the crazyflie generates the times of poolTx, answerRX and finalTx, and uses the payload of the report to...
by alexpic
Sun Dec 03, 2017 3:06 pm
Forum: Loco Positioning System
Topic: Time-of-flight in TWR protocol
Replies: 2
Views: 2115

Re: Time-of-flight in TWR protocol

Hi Arnaud! Thanks for your reply!! Now it's more clear!! For the formula, there is a typo in the wiki. I fixed it, thanks for reporting the discrepancy! You're welcome! It was a pleasure! If you can share your study when you are done I feel it would be a great addition to the documentation for the L...
by alexpic
Sun Nov 26, 2017 11:24 am
Forum: Loco Positioning System
Topic: Time-of-flight in TWR protocol
Replies: 2
Views: 2115

Time-of-flight in TWR protocol

Hi everybody :) I'm studying the communication between Crazyflie and LPS Anchor; i'm studying the Crazyflie firmware, in particular the script lpsTwrTag.c; in this script, after studying the TWR protocol, i observe that t_prop ( https://github.com/bitcraze/crazyflie-firmware/blob/master/src/deck/dri...
by alexpic
Fri Nov 24, 2017 11:24 am
Forum: Loco Positioning System
Topic: How Crazyflie choose a LPSAnchor to communicate
Replies: 4
Views: 2524

Re: How Crazyflie choose a LPSAnchor to communicate

Hi!
Thanks for all! Now for me it's all more clear!
I'll put here every news about it!
Thanks again! Have a nice weekend!
Alex
by alexpic
Fri Nov 24, 2017 11:21 am
Forum: Loco Positioning System
Topic: Trasmitted power by LPS-anchor
Replies: 4
Views: 2590

Re: Trasmitted power by LPS-anchor

Hi!
Thanks for your help! Have a nice weekend!!
by alexpic
Fri Nov 24, 2017 9:44 am
Forum: Loco Positioning System
Topic: How Crazyflie choose a LPSAnchor to communicate
Replies: 4
Views: 2524

Re: How Crazyflie choose a LPSAnchor to communicate

Hi Arnaud! :) Thanks for your reply (and sorry for the wrong section)!! The current implementation is communicating with all the anchor in a round-robin manner. Each time a ranging is initialized, the next anchor is selected: https://github.com/bitcraze/crazyflie-f ... #L250-L252 ... the closest anc...
by alexpic
Fri Nov 24, 2017 9:09 am
Forum: Loco Positioning System
Topic: Trasmitted power by LPS-anchor
Replies: 4
Views: 2590

Re: Trasmitted power by LPS-anchor

Hi Arnaud! Thanks for your reply and thanks for moving the post in the right section! Out of curiosity: why are you interested by it? I'm studying the communication channel as a project for my university (University of L'Aquila), and to do this i'm following two ways: one is this, so i'm interested ...
by alexpic
Tue Nov 21, 2017 7:23 pm
Forum: Loco Positioning System
Topic: How Crazyflie choose a LPSAnchor to communicate
Replies: 4
Views: 2524

How Crazyflie choose a LPSAnchor to communicate

Hi everybody :) i'm interested to the scheduling process of the Crazyflie, so the process in which the drone choose a LPS Anchor to communicate instead of another one; so my questions are: - How the Crazyflie decide to communicate with an LPS Anchor compared to another one in the TWR protocol? - Whe...