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From: | Zan Li |
Subject: | Re: [Discuss-gnuradio] about gps lock |
Date: | Mon, 10 Jun 2013 15:39:21 +0200 |
ZanBest regardsHi Marcus,We have extend the antenna out to the windows and there is an adequate view of sky. When I use the uhd UHD_003.005.001, there is no such problem but now I upadate the version to UHD_003.005.003.
2013/6/8 Marcus D. Leech <address@hidden>
So, I will ask an obvious question:_______________________________________________ Discuss-gnuradio mailing list address@hidden https://lists.gnu.org/mailman/listinfo/discuss-gnuradioZanBest regardsDoes anybody meet the similar problem? Any suggestion would be appreciated.(Here I can not read the gps time from the gpsdo, I think it is because the gpsdo does not lock).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
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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