I have done more tests about the gps message.
while(1){
sleep(1);
std::cout << usrp->get_mboard_sensor("gps_gprmc",0).to_pp_string()
<< std::endl;
}
For the output, at the beginning, there are gps_gprmc message outputs but
after it runs for a while, there would be no gps_gprmc message output. If I
restart, it also works at the beginning. (I update the uhd to 003.005.003
and it works like that. For the old version (003.005.001) I did not meet
this problem.) Does somebody know why it is? thanks!
Best regards
Zan
2013/6/10 Zan Li <alexli19861...@gmail.com>
> Hi 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.
>
> Best regards
>
> Zan
>
>
> 2013/6/8 Marcus D. Leech <mle...@ripnet.com>
>
> **
>>
>> 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
>>
>>
>> _______________________________________________
>> Discuss-gnuradio mailing
>> listDiscuss-gnuradio@gnu.orghttps://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>
>> 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 Consortiumhttp://www.sbrac.org
>>
>>
>> _______________________________________________
>> Discuss-gnuradio mailing list
>> Discuss-gnuradio@gnu.org
>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>
>>
>
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