Open shujjahyamin opened 6 years ago
rommar
commented
6 years ago I had similar problem with my old laptop. As it turned out after several days it just didn't have enough processing power to handle samples in real time. I realized that when I saw that "Current receiver time: .." messages actually go slower than real time. Could this be the case for you?
shujjahyamin
commented
6 years ago Don't know sir, i am using three laptops but same problem.
From: rommar notifications@github.com Sent: Tuesday, July 24, 2018 11:03 AM To: gnss-sdr/gnss-sdr Cc: shujjahyamin; Author Subject: Re: [gnss-sdr/gnss-sdr] Trying to capture realtime signal using RTL_SDR Dongle and sdr stops at 'Tracking of GPS L1 C/A signal started on channel 1 for satellite GPS PRN 30 (Block IIF)' (#194)
I had similar problem with my old laptop. As it turned out after several days it just didn't have enough processing power to handle samples in real time. I realized that when I saw that "Current receiver time: .." messages actually go slower than real time. Could this be the case for you?
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rommar
commented
6 years ago Perhaps you could start gnss-sdr, open some clock widget in Linux and just observe whether "current receiver time" reported by gnss-sdr goes with the same speed as computer clock.
Is gnss-sdr working ok with example RF samples file (mentioned in the manual or quick start)?
What type of SDR frontend do you actually use?
Do you have active antenna and bias-t?
Why do you have such strange sampling frequency? Are you sure it is valid value?
SignalSource.sampling_frequency=2000009.28
shujjahyamin
commented
6 years ago Dear Rommar,
I am using RTL SDR Dongle 2838U as RF Frontend. Yes it has bias-tee, i am connecting an external LNA also with it. I am running front-end calibration file to check what sampling frequency is and then use this calibrated value in my gnss-sdr-realtime-rtl configration file.
Regards,
Shujjah
From: rommar notifications@github.com Sent: Friday, July 27, 2018 1:26 PM To: gnss-sdr/gnss-sdr Cc: shujjahyamin; Author Subject: Re: [gnss-sdr/gnss-sdr] Trying to capture realtime signal using RTL_SDR Dongle and sdr stops at 'Tracking of GPS L1 C/A signal started on channel 1 for satellite GPS PRN 30 (Block IIF)' (#194)
Perhaps you could start gnss-sdr, open some clock widget in Linux and just observe whether "current receiver time" reported by gnss-sdr goes with the same speed as computer clock.
Is gnss-sdr working ok with example RF samples file (mentioned in the manual or quick start)?
What type of SDR frontend do you actually use? Do you have active antenna and bias-t? Why do you have such strange sampling frequency? Are you sure it is correct value? SignalSource.sampling_frequency=2000009.28
— You are receiving this because you authored the thread. Reply to this email directly, view it on GitHubhttps://github.com/gnss-sdr/gnss-sdr/issues/194#issuecomment-408417909, or mute the threadhttps://github.com/notifications/unsubscribe-auth/AKvK4KzRZQmIQsDQmcqOSPmPgJFSlEHQks5uKxUbgaJpZM4VMzbp.
klyg666
commented
2 years ago Sir,I also encountered this problem（Loss of lock in channel 2！） with RTLSDR Dongle 2838U. How do you solve this problem？
YHao29
commented
1 year ago I have the same issue when I use USRP. Is there any solutions?
Dear All, Currently,I have installed gnss-sdr on Ubuntu 16.04 LTS version and using Windows 10 on same system.
I am trying to get realtime GPS Signal using gnss-sdr. Tried to install gnss-sdr on multiple systems multiple times but getting loss of lock errors.
Previously i was able to capture realtime signal, but don't know what's happeing now.
After every thing setup correctly using osmo-sdr here's my log:
After this nothing happen and sdr does'nt stop
Here's my configuration file:
; This is a GNSS-SDR configuration file ; The configuration API is described at https://gnss-sdr.org/docs/sp-blocks/
; You can define your own receiver and invoke it by doing ; gnss-sdr --config_file=my_GNSS_SDR_configuration.conf ;
[GNSS-SDR]
;######### GLOBAL OPTIONS ################## ;internal_fs_sps: Internal signal sampling frequency after the signal conditioning stage [samples per second]. ;FOR USE GNSS-SDR WITH RTLSDR DONGLES USER MUST SET THE CALIBRATED SAMPLE RATE HERE ; i.e. using front-end-cal as reported here:http://www.cttc.es/publication/turning-a-television-into-a-gnss-receiver/ GNSS-SDR.internal_fs_sps=2000009.28
;######### SUPL RRLP GPS assistance configuration ##### ; Check http://www.mcc-mnc.com/ ; On Android: https://play.google.com/store/apps/details?id=net.its_here.cellidinfo&hl=en GNSS-SDR.SUPL_gps_enabled=false GNSS-SDR.SUPL_read_gps_assistance_xml=false GNSS-SDR.SUPL_gps_ephemeris_server=supl.google.com GNSS-SDR.SUPL_gps_ephemeris_port=7275 GNSS-SDR.SUPL_gps_acquisition_server=supl.google.com GNSS-SDR.SUPL_gps_acquisition_port=7275 GNSS-SDR.SUPL_MCC=244 GNSS-SDR.SUPL_MNS=5 GNSS-SDR.SUPL_LAC=0x59e2 GNSS-SDR.SUPL_CI=0x31b0
;######### SIGNAL_SOURCE CONFIG ############ SignalSource.implementation=Osmosdr_Signal_Source SignalSource.item_type=gr_complex ; FOR USE GNSS-SDR WITH RTLSDR DONGLES USER MUST SET THE CALIBRATED SAMPLE RATE HERE ; i.e. using front-end-cal as reported here:http://www.cttc.es/publication/turning-a-television-into-a-gnss-receiver/ SignalSource.sampling_frequency=2000009.28 SignalSource.freq=1575420000 SignalSource.gain=40 SignalSource.rf_gain=40 SignalSource.if_gain=30 SignalSource.AGC_enabled = true SignalSource.samples=0 SignalSource.repeat=false SignalSource.dump=false SignalSource.dump_filename=../data/signal_source.dat SignalSource.enable_throttle_control=false
;# Please note that the new RTL-SDR Blog V3 dongles ship a < 1 PPM ;# temperature compensated oscillator (TCXO), which is well suited for GNSS ;# signal processing, and a 4.5 V powered bias-tee to feed an active antenna. ;# Whether the bias-tee is turned off before reception depends on which version ;# of gr-osmosdr was used when compiling GNSS-SDR. With an old version ;# (for example, v0.1.4-8), the utility rtl_biast may be used to switch the ;# bias-tee, and then call gnss-sdr. ;# See https://github.com/rtlsdrblog/rtl_biast ;# After reception the bias-tee is switched off automatically by the program. ;# With newer versions of gr-osmosdr (>= 0.1.4-13), the bias-tee can be ;# activated by uncommenting the following line: SignalSource.osmosdr_args=rtl,bias=1
;######### SIGNAL_CONDITIONER CONFIG ############ SignalConditioner.implementation=Signal_Conditioner
;######### DATA_TYPE_ADAPTER CONFIG ############ DataTypeAdapter.implementation=Pass_Through
;######### INPUT_FILTER CONFIG ############ InputFilter.implementation=Freq_Xlating_Fir_Filter InputFilter.dump=false InputFilter.dump_filename=../data/input_filter.dat InputFilter.input_item_type=gr_complex InputFilter.output_item_type=gr_complex InputFilter.taps_item_type=float InputFilter.number_of_taps=5 InputFilter.number_of_bands=2 InputFilter.band1_begin=0.0 InputFilter.band1_end=0.45 InputFilter.band2_begin=0.55 InputFilter.band2_end=1.0 InputFilter.ampl1_begin=1.0 InputFilter.ampl1_end=1.0 InputFilter.ampl2_begin=0.0 InputFilter.ampl2_end=0.0 InputFilter.band1_error=1.0 InputFilter.band2_error=1.0 InputFilter.filter_type=bandpass InputFilter.grid_density=16 ;FOR USE GNSS-SDR WITH RTLSDR DONGLES USER MUST SET THE CALIBRATED SAMPLE RATE HERE ; i.e. using front-end-cal as reported here:http://www.cttc.es/publication/turning-a-television-into-a-gnss-receiver/ InputFilter.sampling_frequency=2000009.28 InputFilter.IF=-7309.37 ;IF deviation due to front-end LO inaccuracies [Hz]
;######### RESAMPLER CONFIG ############ Resampler.implementation=Pass_Through
;######### CHANNELS GLOBAL CONFIG ############ Channels_1C.count=4 Channels.in_acquisition=1 Channel.signal=1C
;######### ACQUISITION GLOBAL CONFIG ############ Acquisition_1C.implementation=GPS_L1_CA_PCPS_Acquisition_Fine_Doppler Acquisition_1C.item_type=gr_complex Acquisition_1C.coherent_integration_time_ms=1 Acquisition_1C.threshold=0.015 ;Acquisition_1C.pfa=0.0001 Acquisition_1C.doppler_max=10000 Acquisition_1C.doppler_min=-10000 Acquisition_1C.doppler_step=500 Acquisition_1C.max_dwells=15 Acquisition_1C.dump=false Acquisition_1C.dump_filename=./acq_dump.dat
;######### TRACKING GLOBAL CONFIG ############ Tracking_1C.implementation=GPS_L1_CA_DLL_PLL_Tracking Tracking_1C.item_type=gr_complex Tracking_1C.dump=false Tracking_1C.dump_filename=./trackingch Tracking_1C.pll_bw_hz=40.0; Tracking_1C.dll_bw_hz=2.0; Tracking_1C.order=3; Tracking_1C.early_late_space_chips=0.5;
;######### TELEMETRY DECODER GPS CONFIG ############ TelemetryDecoder_1C.implementation=GPS_L1_CA_Telemetry_Decoder TelemetryDecoder_1C.dump=false
;######### OBSERVABLES CONFIG ############ Observables.implementation=Hybrid_Observables Observables.dump=false Observables.dump_filename=./observables.dat
;######### PVT CONFIG ############ PVT.implementation=RTKLIB_PVT PVT.positioning_mode=PPP_Static ; options: Single, Static, Kinematic, PPP_Static, PPP_Kinematic PVT.iono_model=Broadcast ; options: OFF, Broadcast, SBAS, Iono-Free-LC, Estimate_STEC, IONEX PVT.trop_model=Saastamoinen ; options: OFF, Saastamoinen, SBAS, Estimate_ZTD, Estimate_ZTD_Grad PVT.output_rate_ms=100 PVT.display_rate_ms=500 PVT.dump_filename=./PVT PVT.nmea_dump_filename=./gnss_sdr_pvt.nmea; PVT.flag_nmea_tty_port=false; PVT.nmea_dump_devname=/dev/pts/4 PVT.dump=false PVT.flag_rtcm_server=false PVT.flag_rtcm_tty_port=false PVT.rtcm_dump_devname=/dev/pts/1
Please, help me with this i'll be very thankful.
Regards, Shujjah