Hi,

as far as I know interrogation requests are send on 1030MHz with a
higher bandwidth and a different modulation scheme.

Stefan

Am 17.02.2014 17:11, schrieb Sylvain AZARIAN:
> Hi ,
>
> just one comment : the interrogation is periodic and stable.. the request
> is transmitted by a rotating antenna turning at constant speed. If you can
> get the direct path to the interrogation system, you may estimate the
> round-trip time and then when the interrogation pulse is sent
>
> sylvain
>