LAUNCHXL-CC26X2R1: Calculate distance in meters using RSSI

Ferdinandaoa

Hi,

I'm using TI simplelink SDK to measure the AoA. in the payload I receive using the python sample code, I receive an RSSI. I'd like to show the distance in meters between the master node to slave node.. I found the following code but the result was not very reliable as the values were constantly changing to numbers even when the slave was at the same spot. I received information from a specialist at TI that the LAUNCHXL-CC26X2R1 has a default transmit value of 0db which is @ 1 METERS : -65 dBm see: https://support.kontakt.io/hc/en-gb/articles/201621521-Transmission-power-Range-and-RSSI

I use the following sample code: https://gist.github.com/eklimcz/446b56c0cb9cfe61d575 to calculate the distance where TX power = the known measured signal strength in rssi at 1 meter away. I was wondering if someone has made a solution to calculate distance using RSSI with Texas Insruments devices and Python.

over 5 years ago

0 Marie H over 5 years ago

TI__Guru* 82821 points

Hi Ferdinand,

We don't have any example on how to calculate distances using RSSI.

1) What version of the SimpleLink CC13x2/CC26x2 SDK are you using?

2) Are you trying to do AoA + RSSI or just RSSI?

0 Ferdinandaoa over 5 years ago in reply to Marie H

Prodigy 190 points

Hi Marie,

1. : simplelink_cc13x2_26x2_sdk_4_10_00_78

2: I am already doing AoA and I do receive the RSSI. I just want to calculate the distance between the Master and slave node. Since I have RSSI I think it is possible to do that.. I am asking how :)

0 Clément over 5 years ago in reply to Ferdinandaoa

TI__Guru** 101490 points

Hi,

First, you need to be aware of the limitation of a RSSI based measurement. The environment, the presence of obstacles between the sender and the receiver, the TX power of the sender will have an influence on the RSSI measured.

For the rest, some formulas exist to compute the distance based on the RSSI.

I hope this will help,

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LAUNCHXL-CC26X2R1: Calculate distance in meters using RSSI