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Re: [Discuss-gnuradio] Some questions regarding timestamps on packets

From: call5_99
Subject: Re: [Discuss-gnuradio] Some questions regarding timestamps on packets
Date: Thu, 21 Aug 2008 10:17:43 -0700 (PDT)

          Thank you for the clarifications.


Eric Blossom wrote:
> On Tue, Aug 19, 2008 at 02:53:57PM -0700, call5_99 wrote:
>> Hello,
>>        I am new to GNU radio. So far I have been playing with
>> benchmark_rx
>> and benchmark_tx. Now, I am trying to estimate the distance between the
>> transmitter and the receiver. For this I need a very accurate timestamp
>> on
>> my packets. So my questions are-
>> 1) I need the time stamp in the order of nano seconds. Is it possible to
>> get
>> such accurate timestamp with GNU radio?
> The best we're likely to do with the USRP is 1/64e6 == 15.625ns
> This is based on the frequency of the master clock in the FPGA.
> The master clock is not locked to any kind of a global reference.
>> 2) How do I add timestamp on packet headers? Though I saw many posts on
>> packets with timestamp, I didn't find any, which explained how I go about
>> adding the timestamp at transmitter end, and retrieve  it at receiving
>> end. 
> Folks are working on sorting out the code that handles timestamps right
> now.
> Eric
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