Hi Marcus, Even I used 1Msps or less than this sampling rate, I still saw this time alignment issue. When I am using GNURadio system with python script instead of using UHD API, I can run 10Msps for my 4 channel phase array receiver without any problems. My final goal is to have 50Msps for my 4 channel phase array receiver with dual 10 GiGe cable setup and CDUA computation for wideband AoA detection. My desktop spec is Processors: Intel Core i9 7900X 10-Core 3.3GHz (4.3GHz TurboBoost), Memory: 32GB ORIGIN PC DDR4 Powered by Kingston 3000MHz (4 X 8GB),.
Thanks! All Best, Jack On Sun, Jul 29, 2018 at 11:59 AM, Marcus D. Leech <mle...@ripnet.com> wrote: > On 07/29/2018 12:56 PM, Jack Yang wrote: > > Hi Marcus, > > Thanks for your mail. Yes, I am using 10GiGe interface to run the UHD C++ > code. > Any thoughts or suggestions? > > All Best, > Jack > > On Sun, Jul 29, 2018 at 9:35 AM, Marcus D. Leech via USRP-users < > usrp-users@lists.ettus.com> wrote: > >> On 07/29/2018 12:52 AM, Jack Yang via USRP-users wrote: >> >> Hi, >> >> I have rewrote "rx_samples_to_file.cpp" for making four channel coherent >> receiver (phased-array receiver) in X310. When I executed my code, the >> terminal showed that >> >> *[ERROR] [STREAMER] The receive packet handler failed to time-align >> packets. 1002 received packets were processed by the handler. However, a >> timestamp match could not be determined.* >> >> I have attached my code as the following link ( >> https://www.dropbox.com/s/x0u0tw5e65iaual/rx_samples_X310_TwinRx.cpp?dl=0). >> The info for my UHD version is shown in below >> *"[INFO] [UHD] linux; GNU C++ version 5.4.0 20160609; Boost_105800; >> UHD_3.11.0.HEAD-0-ga1b5c4ae"* >> >> Could someone guide me how to fix this issue? I am using two TwinRx with >> a X310 for my coherent receiver. I basically followed gr-doa python >> configuration to set up the USRP device in C++ code. However, I cannot find >> out why the time alignment is failed in here. >> >> The detailed print-out message is also listed here >> >> Thanks! >> >> All Best, >> Jack >> >> Creating the usrp device with: addr=192.168.40.2... >> [INFO] [UHD] linux; GNU C++ version 5.4.0 20160609; Boost_105800; >> UHD_3.11.0.HEAD-0-ga1b5c4ae >> [INFO] [X300] X300 initialization sequence... >> [INFO] [X300] Determining maximum frame size... >> [INFO] [X300] Maximum frame size: 8000 bytes. >> [INFO] [X300] Setup basic communication... >> [INFO] [X300] Loading values from EEPROM... >> [INFO] [X300] Setup RF frontend clocking... >> [INFO] [X300] Radio 1x clock:200 >> [INFO] [RFNOC DMA FIFO] Running BIST for FIFO 0... >> [INFO] [RFNOC DMA FIFO] BIST passed (Throughput: 1299 MB/s) >> [INFO] [RFNOC DMA FIFO] Running BIST for FIFO 1... >> [INFO] [RFNOC DMA FIFO] BIST passed (Throughput: 1316 MB/s) >> [WARNING] [RFNOC] [0/Radio_0] defines 2 input buffer sizes, but 1 input >> ports >> [INFO] [RFNOC RADIO] Register loopback test passed >> [INFO] [RFNOC RADIO] Register loopback test passed >> [WARNING] [RFNOC] [0/Radio_1] defines 2 input buffer sizes, but 1 input >> ports >> [INFO] [RFNOC RADIO] Register loopback test passed >> [INFO] [RFNOC RADIO] Register loopback test passed >> [INFO] [CORES] Performing timer loopback test... >> [INFO] [CORES] Timer loopback test passed >> [INFO] [CORES] Performing timer loopback test... >> [INFO] [CORES] Timer loopback test passed >> Using Device: Single USRP: >> Device: X-Series Device >> Mboard 0: X310 >> RX Channel: 0 >> RX DSP: 0 >> RX Dboard: A >> RX Subdev: TwinRX RX0 >> RX Channel: 1 >> RX DSP: 1 >> RX Dboard: A >> RX Subdev: TwinRX RX1 >> RX Channel: 2 >> RX DSP: 0 >> RX Dboard: B >> RX Subdev: TwinRX RX0 >> RX Channel: 3 >> RX DSP: 1 >> RX Dboard: B >> RX Subdev: TwinRX RX1 >> TX Channel: 0 >> TX DSP: 0 >> TX Dboard: A >> TX Subdev: Unknown (0x0094) - 0 >> TX Channel: 1 >> TX DSP: 0 >> TX Dboard: B >> TX Subdev: Unknown (0x0094) - 0 >> >> Setting RX Rate: 10.000000 Msps... >> Actual RX Rate: 10.000000 Msps... >> >> [INFO] [MULTI_USRP] 1) catch time transition at pps edge >> [INFO] [MULTI_USRP] 2) set times next pps (synchronously) >> Setting RX Gain: 60.000000 dB... >> Actual RX Gain: 60.000000 dB... >> >> Setting RX Freq: 900.000000 MHz... >> Waiting for "lo_locked": + locked. >> >> Press Ctrl + C to stop streaming... >> [ERROR] [STREAMER] The receive packet handler failed to time-align >> packets. 1002 received packets were processed by the handler. However, a >> timestamp match could not be determined. >> >> >> You're presumably doing this over a 10GiGe interface? >> >> If you run at a lower sample-rate, like 5Msps do you see this problem? > > >
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