Search found 182 matches

by justinleeyang
Fri Mar 27, 2020 12:20 pm
Forum: Loco Positioning System
Topic: tcxo crystal should be improve the accuracy
Replies: 5
Views: 84

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: 5
Views: 84

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: 5
Views: 84

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: 488

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: 674

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: 674

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?
by justinleeyang
Fri Nov 15, 2019 3:32 pm
Forum: Loco Positioning System
Topic: tdoa3 remoteCount
Replies: 3
Views: 302

Re: tdoa3 remoteCount

hi, arnaud:

sorry, I don't understand it, What problems can this parameter solve?
by justinleeyang
Fri Nov 15, 2019 2:27 am
Forum: Loco Positioning System
Topic: tdoa3 remoteCount
Replies: 3
Views: 302

tdoa3 remoteCount

hi,

https://wiki.bitcraze.io/doc:lps:tdoa3: ... ket_format

about tdoa3, how to understand the Header data remoteCount?
by justinleeyang
Sat Aug 03, 2019 10:25 am
Forum: External positioning systems
Topic: can we design and produce the HTC vive's basestations v1/v2 ?
Replies: 3
Views: 1920

can we design and produce the HTC vive's basestations v1/v2 ?

hi

lighthouse position system, we must buy the HTC vive's device, can we design and produce likely devie to replace of the HTC vive's basestations v1/v2 ?
by justinleeyang
Thu Jun 20, 2019 10:49 am
Forum: Developer Discussions
Topic: after enable UART1 for DEBUG PIRNT, system start fail
Replies: 1
Views: 663

after enable UART1 for DEBUG PIRNT, system start fail

hi,

I want to enable UART1 for printf some information, then rewrite config.mk, add :

Code: Select all

CFLAGS += -DENABLE_UART1
CFLAGS += -DDEBUG_PRINT_ON_UART
after compile completely, then make flash, but the system fail.
hope help, thanks!