Mode a packets don't contain time stamp but that should not stop you te 
stamping them from the PC time

Are you Mlat processing. ? 

Sent from my iPhone

> On 27 Jan 2014, at 5:48 pm, Cheng Chi <ch000...@e.ntu.edu.sg> wrote:
> 
> Hi,
> 
> I am using gr-air-modes for decoding the air plane signal with USRP. I've 
> successfully used the "modes_rx" and "modes_gui" for decoding the mode-S 
> packets.
> 
> However, it seems that the modes_rx or modes_gui can't provide the timestamp 
> of the mode-S packets being decoded. Is there any option that I can set to 
> timestamp the mode-S packet? The reason I want this timestamp function is 
> that I want to know the decoded packet data correspond to which part of the 
> raw data (complex baseband data samples). 
> 
> Thank you for any help you can provide in this situation.
> 
> I found that there's a file called "air_modes_preamble.cc" seems to provide 
> the timestamp function. Does anyone know how to use this file separately? 
> 
> Best regards,
> Cheng Chi
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