Search found 186 matches

by justinleeyang
Fri May 22, 2020 7:41 am
Forum: Developer Discussions
Topic: AI deck
Replies: 1
Views: 367

AI deck

hi,

Can AI deck use cameras to recognize objects or faces ? I feel that this chip cannot be purchased from China, I consider whether it can be replaced with canaan's K210. Both performance and price should be met.
by justinleeyang
Mon May 18, 2020 12:15 pm
Forum: Loco Positioning System
Topic: uwb and 2.4GHZ radio maybe interference ?
Replies: 1
Views: 540

uwb and 2.4GHZ radio maybe interference ?

hi,

when uwb and 2.4GHZ were working simultaneously, the packet loss rate of 2.4GZH will be higher.
how to solve it ? 2.4GHZ switch to other channel ?
by justinleeyang
Fri Apr 03, 2020 3:06 am
Forum: Loco Positioning System
Topic: tcxo crystal should be improve the accuracy
Replies: 7
Views: 1413

Re: tcxo crystal should be improve the accuracy

Here's one of the better explanations I found of the situation, but like I wrote this isn't exactly my domain so I can't judge if whatever is written is valid or not. There's more answers in the same thread as well. thanks for your share,Even if there are defects sometimes, we still have to use the...
by justinleeyang
Fri Apr 03, 2020 3:02 am
Forum: Loco Positioning System
Topic: tcxo crystal should be improve the accuracy
Replies: 7
Views: 1413

Re: tcxo crystal should be improve the accuracy

You can log the measured clock drift (clock correction) with the tdoaEngine.cc log if you want to check it out. about lps-node code , the uwb_tdoa3_anchor.c file , we measure the clockCorrection as following: double clockCorrection = calculateClockCorrection(anchorCtx, remoteTxSeqNr, remoteTx, rxTi...
by justinleeyang
Fri Mar 27, 2020 12:20 pm
Forum: Loco Positioning System
Topic: tcxo crystal should be improve the accuracy
Replies: 7
Views: 1413

Re: tcxo crystal should be improve the accuracy

hi, and tcxo is indeed very stable. For example, the distance measurement has a stable jitter, which is generally less than 10 cm. In addition, there will also be a stable absolute deviation. We only need to do a linear correction. If an ordinary crystal is used, a non-linear correction is required....
by justinleeyang
Fri Mar 27, 2020 12:13 pm
Forum: Loco Positioning System
Topic: tcxo crystal should be improve the accuracy
Replies: 7
Views: 1413

Re: tcxo crystal should be improve the accuracy

hi, marcus: Yeah, from the tdoa sync , we find that when power on the chip, the tcxo warm up about 1min . tdoa2 don't any question. my doubt is tdoa 3 send a packet about random 30ms, the packet record the tx timestamp, and other anhcor receive and record the rx timestamp, badly, if the two packet t...
by justinleeyang
Thu Mar 26, 2020 3:07 pm
Forum: Loco Positioning System
Topic: tcxo crystal should be improve the accuracy
Replies: 7
Views: 1413

tcxo crystal should be improve the accuracy

hi,

I noticed that dwm1000 uses a normal crystal, if I use a TCXO crystal, I think it can improve some accuracy
by justinleeyang
Wed Nov 27, 2019 3:14 pm
Forum: Loco Positioning System
Topic: ch2 and ch3 Interfere
Replies: 1
Views: 875

ch2 and ch3 Interfere

Interfere with each other about ch2 and ch3, but the two channel don't use the same frequence.
when sniffer set as ch2, tag set as ch3, sniffer still receive tag's data, why?
by justinleeyang
Wed Nov 27, 2019 3:09 pm
Forum: Loco Positioning System
Topic: when exist metal or wall, about tdoa3
Replies: 5
Views: 1386

Re: when exist metal or wall, about tdoa3

hi,

Inter-anchors are LOS, but tag and anchors maybe exist occlusion,
by justinleeyang
Sun Nov 24, 2019 4:16 pm
Forum: Loco Positioning System
Topic: when exist metal or wall, about tdoa3
Replies: 5
Views: 1386

when exist metal or wall, about tdoa3

hi,

If there is some metal or wall occlusion in the environment, the TDOA3 algorithm be used, and the positioning is very inaccurate?