Tip / Sign in to post questions, reply, level up, and achieve exciting badges. Know more

Radar sensor Forum Discussions

shoko_s
Level 4
Level 4
25 sign-ins 25 replies posted 10 sign-ins

Hello, 

I have a question about "Theoretical Max Range" displayed on "Radar Fusion GUI". 

I have measured Range under the following condition in Radar Fusion GUI. 

 Samples per Chirp: 256, Chirps per Frame: 1, Chirp Reptition Time: 506us, Frame rate: 10Hz

 Start freq: 58GHz, End freq: 63.5GHz, Sampling BW: 5.5GHz

 Tx Power Level: 31, Received IF Gain: 40dB, Cutoff freq of the HPF: 80kHz

 Sampling Rate: 1000kHz

"Theoretical Max Range: 3.5m" is displayed below "Samples per Chirp" when I enter the above the condition in Radar Fusion GUI. 

I understand Theoretical Max Range is calculated by the follwing formula; 

 Theoretical Max Range = (Sampling Rate * Speed of light) / (2 * (Sampling BW/Chirp Reptition Time))

Theoretical Max Range is 13.79m using the above formula, not 3.5m. 

Please let me know why theose are different. 

Please advise. 

Regards, Shoko 

1.png

0 Likes
1 Solution
HoneyDhandhukia
Moderator
Moderator
Moderator
25 likes received First comment on blog First question asked

Hello @shoko_s ,

Chirp repetition time (in seconds): This is the time period that elapses between the beginnings of two consecutive chirps in a frame. The chirp repetition time is also commonly referred to as pulse repetition time or chirp-to-chirp-time).

Please refer to the SDK documentation (located at: \radar_sdk\doc) for all the explanation regarding the parameters used in Radar Fusion GUI

Hope this helps!

Best Regards,
Honey

 

View solution in original post

0 Likes
5 Replies
Montassar-BR
Employee
Employee
100 replies posted 50 solutions authored 100 sign-ins
0 Likes
HoneyDhandhukia
Moderator
Moderator
Moderator
25 likes received First comment on blog First question asked

Hello @shoko_s ,

In addition to the above reply, you may also refer to the range calculations as described below:

1a8ef122-100b-4c8e-9f75-b2113417930f.PNG

Hope this helps!

Best Regards,
Honey

0 Likes
shoko_s
Level 4
Level 4
25 sign-ins 25 replies posted 10 sign-ins

Hello Montassar & Honey, 

Thank you so much for your response! 

I understand the cailcurate method of max range for Radar Fusion GUI.  

I have an additional question about Radar Fusion GUI parametor. 

What part of the following image does "Chirp repetition Time" refer to? 

1.png

I think that it is the period between tx start and tx end per 1Chirp. 

Please advise. 

Best regards, 

Shoko 

0 Likes
HoneyDhandhukia
Moderator
Moderator
Moderator
25 likes received First comment on blog First question asked

Hello @shoko_s ,

Chirp repetition time (in seconds): This is the time period that elapses between the beginnings of two consecutive chirps in a frame. The chirp repetition time is also commonly referred to as pulse repetition time or chirp-to-chirp-time).

Please refer to the SDK documentation (located at: \radar_sdk\doc) for all the explanation regarding the parameters used in Radar Fusion GUI

Hope this helps!

Best Regards,
Honey

 

0 Likes
shoko_s
Level 4
Level 4
25 sign-ins 25 replies posted 10 sign-ins

Hello Honey, 

Thank you for quick response! 

I understand the definition of Chirp repetition time. 

Thank you, Shoko