Re: [Discuss-gnuradio] [USRP-users] Bug in GPS time reported by the USRP

[Michael West]

Hi Eugene,

The sensor returns a time_t value, which is based on the Unix epoch.  Your application can translate that value however it needs.  You can also get the GPRMC NMEA string by calling USRP.get_mboard_sensor('gps_gprmc') and get the raw value from that if necessary.

Regards,

Michael

On Tue, Dec 6, 2016 at 6:25 PM, Dan CaJacob via USRP-users <address@hidden> wrote:

Hi Eugene,

Please check that time stamp here: http://www.unixtimestamp.com/index.php  It looks alright to me.  It *is* reporting the correct time in a unix timestamp format.  Maybe you are making a more subtle point about nomenclature?  As in the GPS epoch is not the same as the Unix timestamp epoch  in 1970?  In any event, a unix time stamp is fairly common, unambiguous way to specify a time.

Thanks,

Dan 

On Tue, Dec 6, 2016 at 8:19 PM Eugene Grayver <address@hidden> wrote:

This is being posted to both GR and Ettus forums because both groups should be aware.

The value returned by  USRP.get_mboard_sensor('gps_time') is incorrect.  It is NOT the GPS epoch, but is time relative to the UNIX epoch.  Only off by a decade or so...

'GPS epoch time: 1481073287 seconds'

________________________

Eugene Grayver, Ph.D.
Aerospace Corp., Sr. Eng. Spec.
Tel: 310.336.1274
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Very Respectfully,

Dan CaJacob

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