Re: [Discuss-gnuradio] Timestamp 'rx_time' in Metadata

[Jeff Long]

rx_time is the time something upstream was received. This could be the 
time of the first sample received by a USRP:

https://gnuradio.org/doc/doxygen/classgr_1_1uhd_1_1usrp__source.html#a8ba918061af928ee7c01e7124580eb82

rx_time could also be the time a packet was received, or could be set by 
other blocks.

There is a utility called gr_read_file_metadata that installs with GR, 
but I haven't tried it yet.

On 01/31/2018 05:37 PM, Zhongyuan Zhao wrote:
> Hi
>
> I have several questions regarding the rx_time in the metadata file 
> sink, https://gnuradio.org/doc/doxygen/page_metadata.html
>
> 1) What is exactly the timestamp? The moment first sample is recorded on 
> the hard drive?
> 2) Is there an example to convert rx_time to readable format?
> 3) Is there an way to timestamp the IQ data at the moment they are 
> generated by USRP?
>
> Thanks.
> Zhongyuan Zhao
>
>
>
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