Some people acheive 50cm repetability with moving target of few meters/sec (5 or so).
Basically, a node A send a message asking to node B to send back the message (don't need to be very long). Node A is able to estimate the Time to process the packet TPP and measure the Round Trip Time.
The Time of Flight is then Round Trip Time - TPP.
If c is the speed of light
d = c * ToF / 2
0- Is it a good idea to implement such a thing? (i.e.: any chance to get a good result)
1- Do you think ESP8266 EX could be able to measure TOF?
2- Do you have any plan to implement such a function?
3- Could you have a function in the SDK to get the result (and trigger the measurement)?
It shows TOF is much better than RSS for distance measurement
this is a really sharp question. thanks.
yes, we did implement a TOA algorithm within our chip. Yes, in ESP8266. We will enable this at a suitable time.
But beware that TOA is very sensitive to multi path effects, i.e. in TOA algorithm in ESP8266 per se, has only basic mitigation against multi-path now.
The Espressif Algorithm Team
Thank you in advance.
Thanks & Regards,
can you please respond regarding when it will be enabled on ESP8266 SDK? it's really urgent for me to know this, since one of my customer is waiting to make decision regarding the WiFi chip set to be used for Human Tracking for his Indoor Location application, i suggested him to go with your ESP8266 chip since it's cost effective & power efficient and wide open source support but they want time based location system than RSSI based ones, given location accuracy and robustness is one of the key specs.
Thanks & Regards,
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