Mal Goris wrote:

> There is more than one Barker code for a given number of symbols and separate
 devices
> can operate near each other if they use different Barker codes. This system
 has good
> noise immunity too. This is all very similar to spread-spectrum modulation or
> code-division multiplexing. Longer Barker codes are better but require more
> computing for the cross correlation and take longer to transmit, so you have
 to be
> sure you will finish transmitting before the reflection returns.
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Why not possible to transmitte and receive Barker's sequency at one time
?
In simplest case Barker's sequency consist from "1"(+1) and "0"(-1) so
computing cross--corelation easy execute by XORing Send_Barker[] with
Recv_Barker[] bit to bit and sum resulting bit sum . The main difficulty
is time step choicing resulting from what distance measure precision
needed.

I would like to see any additional information about Barker codes longer
than 13 digit . If this topic not interesting in PICLIST welcome private
email .

WBR Dmitry.