• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 2 answers
  • Subscribers 51 subscribers
  • Views 451 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

CC2642R-Q1: RADAR Time of Flight (TOF) - Scientific Principle

Donatz
Prodigy 190 points
Part Number: CC2642R-Q1

Hi,

I am proposing to my colleagues to use the BLE5.0 capability of CC2642R-Q1 to determine (or localize) the distance of a mobile device from a fixed base device. However, before investigating directly to the computational capability (Time to Digital Converter function, etc.) of  CC2642R-Q1, I need to investigate the physics of its Radio TOF capability (effect on distance calculation of Radio SNR, temperature, etc.). 

I have tried to search from the rich technical resources of TI. But, unfortunately the closest thing that I have found is about LIDAR TOF below.

-------------------------------------------------------------------------------------

Introduction to Time-of-Flight (ToF) System Design (Rev. D) 

Literure Number: SBAU219D

http://www.ti.com/lit/ug/sbau219d/sbau219d.pdf

-------------------------------------------------------------------------------------

I am hoping that someone could support me in finding a similar document that focuses on RADAR TOF instead.

Thanks!

  • 0
    TI__Guru* 94218 points

    Hi,

    You should have a look to the following resources:

    - The BLE5 User's guide

    - The SLA lab dedicated to TOF

    Regards,

  • 0 in reply to Clément
    Prodigy 190 points

    Hi Clément,

     

    Good day.

     

    Thank you for the response.

    I will go on it...

    Best Regards, 

  • 0 in reply to Clément
    Prodigy 190 points

    Hi Clément,

     

    Good Day.

     

    Again, thank you for sharing the BLE and SLA Lab related resources.

    Although, I have an inquiry related to distance calculation discussed in the BLE5 User's guide (RTLS Toolbox ➡ Time of Flight ➡ Theory of Operation ➡ Accuracy).

    The discussed ToF concept demonstrates that due to :

    1. spreading introduced by un-synchronized clocks between devices and 

    2. phase noise/drift in individual devices 

    which act as some sort of dithering noise, and together with statistics, it is possible to increase the distance measurement resolution.

     

    In the example, a distance of 1.88 meter was calculated although 1 clock tick is equal to 18.75 meter resolution.

    I would like to know the minimum distance resolution possible. (Is statistics, in this case, reliable until let say 0.5 meter ? or even 100cm?)

    It would be of great help, if you could you guide me to some related resources that could give light to the above inquiry.

     

    Best Regards,

  • 0 in reply to Donatz
    TI__Guru* 94218 points

    Hi,

    I think I already provided you the best resources we have :)

    In theory and with an infinite number of samples you can achieve whatever precision you want (cf. the calculator provided in the SLA lab). In practice you will soon be limited by the amount of power you have at your disposal. In addition all the numbers provided are provided when running the tests in a controlled environment (using a waveguide). 

    In summary, you have to run your own tests and probably have to improve the examples provided using your own algorithms.

    I hope this will help,

  • 0 in reply to Clément
    Prodigy 190 points

    Hi Clément,

    I understand... 

     

    Thanks!