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.
Setting device clock source to:external
because the gpsdo does not lock).*
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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.
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!