Hi, I am having an issue with UHD not aligning to GPS time using a GPSDO. I am
able to run query_gpsdo_sensors and succesfully lock to GPS, but UHD time never
alighs to GPS time even after over an hour of waiting. I am in a lab with a
strong GPS-repeater signal that has been used to quickly align time in other
devices successfully. I have also updated UHD to I am wondering if anyone else
has had similar issues or could suggest a solution. I have included system
information from uhd_find_devices, query_gpsdo_sensors, and uhd_usrp_probe
below. Any advice would be much appreciated, thanks!
Andrew
sdrl@star00:~$ uhd_find_devices
[INFO] [UHD] linux; GNU C++ version 5.4.0 20160609; Boost_105800;
UHD_3.11.1.0-0-gad6b0935
--------------------------------------------------
-- UHD Device 0
--------------------------------------------------
Device Address:
type: usrp2
addr: 192.168.10.104
name:
serial: 313E04C
sdrl@star00:/usr/lib/uhd/utils$ query_gpsdo_sensors
[INFO] [UHD] linux; GNU C++ version 5.4.0 20160609; Boost_105800;
UHD_3.11.1.0-0-gad6b0935
[Creating the USRP device with: ...
WARNING] [UHD] Unable to set the thread priority. Performance may be negatively
affected.
Please see the general application notes in the manual for instructions.
EnvironmentError: OSError: error in pthread_setschedparam
[INFO] [USRP2] Opening a USRP2/N-Series device...
[INFO] [USRP2] Current recv frame size: 1472 bytes
[INFO] [USRP2] Current send frame size: 1472 bytes
[INFO] [USRP2] Detecting internal GPSDO....
[INFO] [GPS] Found an internal GPSDO: Jackson-Labs, FireFly , Firmware Rev 0.929
[WARNING] [UHD] Unable to set the thread priority. Performance may be
negatively affected.
Please see the general application notes in the manual for instructions.
EnvironmentError: OSError: error in pthread_setschedparam
[INFO] [USRP2] Setting references to the internal GPSDO
Using Device: Single USRP:
Device: USRP2 / N-Series Device
Mboard 0: N210r4
RX Channel: 0
RX DSP: 0
RX Dboard: A
RX Subdev: UBX RX
TX Channel: 0
TX DSP: 0
TX Dboard: A
TX Subdev: UBX TX
**************************************Helpful Notes on Clock/PPS
Selection**************************************
As you can see, the default 10 MHz Reference and 1 PPS signals are now from the
GPSDO.
If you would like to use the internal reference(TCXO) in other applications,
you must configure that explicitly.
You can no longer select the external SMAs for 10 MHz or 1 PPS signaling.
****************************************************************************************************************
GPS Locked
USRP NOT Locked to GPSDO 10 MHz Reference.
Double check installation instructions (N2X0/E1X0 only):
https://www.ettus.com/content/files/gpsdo-kit_4.pdf
GPS and UHD Device time are NOT aligned last_pps: 4642 vs gps: 1533332119. Try
re-running the program. Double check 1 PPS connection from GPSDO.
Printing available NMEA strings:
GPS_GPGGA:
$GPGGA,213519.00,3347.1387,N,08423.6992,W,2,09,1.1,310.7,M,-31.2,M,,*56
GPS_GPRMC: $GPRMC,213519.00,A,3347.1387,N,08423.6992,W,0.0,0.0,030818,,*29
GPS epoch time: 1533332119 seconds
UHD Device time: 4642 seconds
PC Clock time: 1533332119 seconds
Done!
sdrl@star00:~$ uhd_usrp_probe
[INFO] [UHD] linux; GNU C++ version 5.4.0 20160609; Boost_105800;
UHD_3.11.1.0-0-gad6b0935
[INFO] [USRP2] Opening a USRP2/N-Series device...
[INFO] [USRP2] Current recv frame size: 1472 bytes
[INFO] [USRP2] Current send frame size: 1472 bytes
[INFO] [USRP2] Detecting internal GPSDO....
[INFO] [GPS] Found an internal GPSDO: Jackson-Labs, FireFly , Firmware Rev 0.929
[WARNING] [UHD] Unable to set the thread priority. Performance may be
negatively affected.
Please see the general application notes in the manual for instructions.
EnvironmentError: OSError: error in pthread_setschedparam
[INFO] [USRP2] Setting references to the internal GPSDO
_____________________________________________________
/
| Device: USRP2 / N-Series Device
| _____________________________________________________
| /
| | Mboard: N210r4
| | hardware: 2577
| | mac-addr: 00:80:2f:18:6e:43
| | ip-addr: 192.168.10.104
| | subnet: 255.255.255.255
| | gateway: 255.255.255.255
| | gpsdo: none
| | serial: 313E04C
| | FW Version: 12.4
| | FPGA Version: 11.1
| |
| | Time sources: none, external, _external_, mimo, gpsdo
| | Clock sources: internal, external, mimo, gpsdo
| | Sensors: gps_gpgga, gps_gprmc, gps_time, gps_locked, gps_servo,
mimo_locked, ref_locked
| | _____________________________________________________
| | /
| | | RX DSP: 0
| | |
| | | Freq range: -50.000 to 50.000 MHz
| | _____________________________________________________
| | /
| | | RX DSP: 1
| | |
| | | Freq range: -50.000 to 50.000 MHz
| | _____________________________________________________
| | /
| | | RX Dboard: A
| | | ID: UBX-40 v2 (0x007c)
| | | Serial: 313C15C
| | | _____________________________________________________
| | | /
| | | | RX Frontend: 0
| | | | Name: UBX RX
| | | | Antennas: TX/RX, RX2, CAL
| | | | Sensors: lo_locked
| | | | Freq range: 10.000 to 6000.000 MHz
| | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB
| | | | Bandwidth range: 40000000.0 to 40000000.0 step 0.0 Hz
| | | | Connection Type: IQ
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | RX Codec: A
| | | | Name: ads62p44
| | | | Gain range digital: 0.0 to 6.0 step 0.5 dB
| | | | Gain range fine: 0.0 to 0.5 step 0.1 dB
| | _____________________________________________________
| | /
| | | TX DSP: 0
| | |
| | | Freq range: -200.000 to 200.000 MHz
| | _____________________________________________________
| | /
| | | TX Dboard: A
| | | ID: UBX-40 v2 (0x007b)
| | | Serial: 313C15C
| | | _____________________________________________________
| | | /
| | | | TX Frontend: 0
| | | | Name: UBX TX
| | | | Antennas: TX/RX, CAL
| | | | Sensors: lo_locked
| | | | Freq range: 10.000 to 6000.000 MHz
| | | | Gain range PGA0: 0.0 to 31.5 step 0.5 dB
| | | | Bandwidth range: 40000000.0 to 40000000.0 step 0.0 Hz
| | | | Connection Type: QI
| | | | Uses LO offset: No
| | | _____________________________________________________
| | | /
| | | | TX Codec: A
| | | | Name: ad9777
| | | | Gain Elements: None
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