Understanding Barker Codes

This video explains the fundamental concepts behind Barker codes and how they are used in pulse compression radar systems.
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[@aldencaterio3394]

Great video explaining Barker Codes to someone who is new to radar concepts

[@marais75012]

Great explanation, very clear

[@pauldenisowski]

Thanks!

[@TheGmr140]

a great talk, thanks

[@pauldenisowski]

Thanks for the feedback!

[@shuangyiliu66]

very clear demostration!

[@rohithvarma45]

perfectly explained

[@makro80]

Excellent video!

[@tyranor27]

Thanks a lot !!!

[@lucadebs7872]

If I have a data sequence 1000 elements long and I want a training sequence (using Barker) for example 11 elements long... how do I define it? They will both go into one frame that will be sent, but how long do I make the barker sequence? 11 elements long?

[@pauldenisowski]

The lengths of all possible Barker sequences are already known (people have spent a long time unsuccessfully searching for additional sequences), so you're essentially stuck with the existing sequences. I would probably just use the Barker sequence with the length closest to the one you want (there is a length = 11 Barker sequence). Hope that helps!

[@lucadebs7872]

@@pauldenisowski Thanks for the clarifications! So I don't care if my frame has 1000 elements or 10k.. the barker sequence I insert in the frame remains unchanged (for example of 11 elements)

[@eslamfayad5067]

what is the minimum Bandwidth required for receiver for barker 13 code ?is it calculated for total T of 13 code or tao for one change in phase to another phase?

[@user-rf4li7fc7p]

The bandwidth is linear with the reciprocal of the sub-range duration.

[@abhijeetchauhan4111]

will the frequency content of the phase coded signal will be the same ? I mean If I take FFT, will it give only one frequency ?

[@pauldenisowski]

Since Barker codes are normally used in pulse compression radar systems, the spectral content of a "normal" Barker-coded RF signal would have very broad spectral content -- i.e. the typical sin(x)/x spectrum that's created by pulsed signal. Even if you gated the FFT to only acquire over the length of the pulse, any abrupt phase transitions would also create spectral regrowth, so I think it's very unlikely you would get power only at one frequency after taking an FFT.
[I suppose if you made a gated measurement over the pulse AND you very carefully chose the pulse frequency to minimize the abruptness of the phase transitions -- i.e. each sub-range contains as close to an integer number of cycles as possible -- you could reduce the width of the spectral content, but this would be both very difficult to do and very unrealistic]
Hope that helps!