Dear all,
I meet a problem about the gpsdo for lock. First I check the
usrp->get_mboard_sensor("gps_locked",0); it indicates the gps is
locked. Then the program is sleep for 5 mins. Then I check the gps
again but in this time it does not lock. I do not think that in this 5
mins the gps lost lock because every time I try like this, the first
time it is locked but after 5 mins it is unlocked, as follows:
*The reference clock is:GPS lock status: locked*
Setting device clock source to:external
Setting device clock rate to:1e+08
Setting time source to:external
*The reference clock is:GPS lock status: unlocked*
UHD Warning:
get_time: ValueError: get_nmea(): no GPRMC message found
UHD Warning:
get_time: ValueError: get_nmea(): no GPRMC message found
*(Here I can not read the gps time from the gpsdo, I think it is
because the gpsdo does not lock).*
Does anybody meet the similar problem? Any suggestion would be
appreciated.
Best regards
Zan
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So, I will ask an obvious question:
Does your GPS receiver have an adequate view of the sky? That is, does
it have an external, amplified antenna outdoors, or near a window that
doesn't
have low-E film on it.
--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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