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osqzss / gps-sdr-sim

Software-Defined GPS Signal Simulator
MIT License
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Problems getting devices to lock using Adalm-Pluto #225

Open toppharley opened 4 years ago

toppharley commented 4 years ago

Hi,

I'm having some trouble to get any tested device to lock on simulated location, using Adalm-Pluto:

Linux pluto 4.14.0-41915-gc2041af #279 SMP PREEMPT Mon Jan 14 13:13:47 CET 2019 armv7l GNU/Linux Machine model: Analog Devices PlutoSDR Rev.B (Z7010/AD9363)

1) File to be played:

pi@raspberrypi:~ $ ./gps-sdr-sim/gps-sdr-sim -e ./brdc.n -l 41.661636,-4.7446656,630 -t 2019/12/24,12:00:00 -o ./gpssim2.bin -s 10e6 -b 8 -v Using static location mode. 8.382e-09 -1.490e-08 -5.960e-08 1.192e-07 9.421e+04 -1.311e+05 -1.311e+05 8.520e+05 3.72529029846e-09 6.21724893790e-15 405504 2085 18 Start time = 2019/12/24,12:00:00 (2085:216000) Duration = 300.0 [sec] 02 221.6 30.5 22691094.9 3.7 05 304.7 66.5 20530759.3 2.2 06 185.6 9.3 24752200.0 6.5 07 53.0 46.3 21876248.5 2.8 09 79.7 11.2 24550751.8 5.9 13 274.8 39.4 21957357.0 3.0 15 274.5 7.6 24660240.1 5.2 28 141.6 15.4 23932301.2 5.8 30 103.4 75.9 20424508.4 2.1 Time into run = 30.0 02 221.4 30.3 22705012.0 3.7 05 304.5 66.8 20523720.9 2.2 06 185.5 9.1 24773209.5 6.6 07 52.9 46.1 21887898.0 2.8 09 79.9 11.1 24567389.4 5.9 13 275.0 39.6 21944882.8 3.0 15 274.6 7.8 24642381.9 5.2 28 141.4 15.6 23915663.7 5.7 30 102.4 75.9 20424895.2 2.1 Time into run = 60.0 02 221.3 30.1 22718988.0 3.7 05 304.3 67.0 20516768.1 2.2 06 185.5 8.9 24794211.0 6.6 07 52.8 45.9 21899612.3 2.8 09 80.0 10.9 24584032.7 5.9 13 275.2 39.7 21932449.8 2.9 15 274.8 7.9 24624533.9 5.1 28 141.3 15.8 23899048.3 5.7 30 101.4 75.8 20425381.8 2.1 Time into run = 63.8 ^C

2) Playing the file: pi@raspberrypi:~ $ ./gps-sdr-sim/player/plutoplayer -t ./gpssim2.bin

Transmit file size: 1.187 GB Acquiring IIO context Found (Analog Devices Inc. PlutoSDR (ADALM-PLUTO)) Acquiring devices Context has 5 device(s). Acquiring TX device Initializing streaming channels Enabling IIO streaming channels Creating TX buffer Transmit starts... Done.

3) Taking a look ./retrogram-plutosdr --rate 5e6 --bw 3e6 --freq 1575.42e6 --step 0.01e6 --ref-lvl 0 --uri usb:1.7.5 ( no profile change)

4) Also, getting no locks either when using other software: pi@raspberrypi:~ $ pluto-gps-sim/pluto-gps-sim -e ./brdc.n -B 3.0 -A -30 -l 41.661636,-4.7446656,0 -U usb:1.7.5 -t 2019/12/24,12:00:00 -v Using static location mode. 8.382e-09 -1.490e-08 -5.960e-08 1.192e-07 9.421e+04 -1.311e+05 -1.311e+05 8.520e+05 3.72529029846e-09 6.21724893790e-15 405504 2085 18 Gain: -30.0dB RINEX date = 24-DEC-19 06:42 Start time = 2019/12/24,12:00:00 (2085:216000) PRN Az El Range Iono 02 221.6 30.5 22691415.0 3.7 05 304.7 66.5 20531337.2 2.2 06 185.6 9.3 24752301.5 6.5 07 53.0 46.3 21876703.7 2.8 09 79.7 11.2 24550874.3 5.9 13 274.8 39.4 21957756.8 3.0 15 274.5 7.6 24660323.6 5.2 28 141.6 15.4 23932468.9 5.8 30 103.4 75.9 20425119.5 2.1

I'm stumped,... any help would be greatly appreciated.

Cheers!

Mictronics commented 4 years ago

I assume with device you mean a mobile. Are you aware that on modern mobile device GPS is only one of several services to obtain the device location. Also, real GPS has very low guaranteed signal strength everywhere on earth. Your device may include jamming detection by strong signals and therefore doesn't consider the Pluto signal being valid.

Narhog commented 4 years ago

I've the same issue. But then my attenuation is higher than -55.0 dB, the regular GPS-signals get jammed. And as far as i know, my mobile has no jamming detection.

jamesl-dm commented 4 years ago

Try turning off your pluto's xo_correction (fw_setenv xo_correction 40000000 on console), and use a baseband data rate of 4 MHz. Set the attenuation to 80 dB, and put the receiver within 30 cm of the pluto.

atchyuth-rao commented 3 years ago

I am not getting a position fix with the PLUTO SDR card, I have generated a signal with a -100dbm signal power using PLUTO SDR and fed to U-Blox8 GNSS Receiver, satelliteS are acquired but their C/N Ratios are changes gradually i.e. not constant C/N ratio, I am getting position fix and gone

can you help me out to resolve the issue

jamesl-dm commented 3 years ago

Try this .grc file in gnuradio companion. You need to disable xo_correction on your Pluto, then tweak the value in the ppmOutTarget variable of the grc file.

gps-sdr-sim.zip

atchyuth-rao commented 3 years ago

thank you so much for your response,

I am not using gnu radio, I am having plutoplayer.c code which is linux compatible, using this plutoplayer.c code I am generating RF signal by following the commands in gps-sdr-sim.zip file

please helpme out to resolve the issue

jamesl-dm commented 3 years ago

I suggest you install gnuradio. Disabling xo_correction will probably be enough though, so long as your GPS receiver can tune in the remaining ppm on its own.

atchyuth-rao commented 3 years ago

thank you for your response

I will try and let you know

atchyuth-rao commented 3 years ago

is there any other way to solve this problem?

On Tue, Mar 9, 2021 at 10:26 AM jamesl-dm notifications@github.com wrote:

I suggest you install gnuradio. Disabling xo_correction will probably be enough though, so long as your GPS receiver can tune in the remaining ppm on its own.

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Mictronics commented 3 years ago

fw_setenv xo_correction 40000000

This will not turn off XO correction but overwrites the factory calibration value of the oscillator. Keep in mind: The output frequency will be generated by multiplication from reference frequency (40000000 Hz). Any offset in reference will be multiplied at the output. Setting 4000000 Hz as (assumed) fix reference might create a difference to the real TCXO/OCXO frequency. This difference is then multiplied and a visible offset at 1575 MHz.

My two Pluto using 40000017 and 40000004 to create a precise output at 1575.42 MHz.

jamesl-dm commented 3 years ago

The issue is, if you use the xo_correction the relationship between the RF center frequency and the baseband sample rate gets recalculated and quantized according to a complex algorithm in the Pluto driver. And if you're unlucky, the quantized values will be so far off that the baseband sample rate will slip in and out of phase coherence with what the GPS receiver is expecting based on the center frequency. This causes the signal strengths reported by the receiver to oscillate, and the receiver loses lock. So my solution is to set xo_correction to nominal, and account for the quantization and ppm correction in software. You even have to account for the gnuradio resampler block quantizing its arguments into a single precision float - the GPS receiver is that sensitive!

atchyuth-rao commented 3 years ago

Hello James,

Earlier I have Generated GPS signal samples with 2.6MHz sampling frequency using Pluto SDR, with that sampling frequency satellite C/N ratios are oscillates very frequently in GNSS Receiver

Later I have changed sampling frequency to 2.5MHz with this sampling frequency I am getting constant 2D fix in GNSS Receiver, I am not getting 3D fix

I have done nothing regarding xo_correction for Pluto in GNU radio

On Wed, Mar 10, 2021, 07:13 jamesl-dm notifications@github.com wrote:

The issue is, if you use the xo_correction the relationship between the RF center frequency and the baseband sample rate gets recalculated and quantized according to a complex algorithm in the Pluto driver. And if you're unlucky, the quantized values will be so far off that the baseband sample rate will slip in and out of phase coherence with what the GPS receiver is expecting based on the center frequency. This causes the signal strengths reported by the receiver to oscillate, and the receiver loses lock. So my solution is to set xo_correction to nominal, and account for the quantization and ppm correction in software. You even have to account for the gnuradio resampler block quantizing its arguments into a single precision float - the GPS receiver is that sensitive!

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jamesl-dm commented 3 years ago

The .grc file I posted is configured for a 4 MHz sample rate, and the xo_correction set to 40000000. That's all the help I can offer - I'm unsubscribing from this thread now.

atchyuth-rao commented 3 years ago

Dear james and mictronics,

i have modified xo_correction to 40MHz of pluto sdr in config.txt file which was given by pluto SDR mass storage

[image: image.png]

GPS IQ Samples Generation: [image: image.png]

U-blox GNSS receiver Results: [image: image.png] i am getting constant 2D fix, i am not getting 3D fix , can you help me out where is the issue.

On Wed, Mar 10, 2021 at 8:37 AM jamesl-dm @.***> wrote:

The .grc file I posted is configured for a 4 MHz sample rate, and the xo_correction set to 40000000. That's all the help I can offer - I'm unsubscribing from this thread now.

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atchyuth-rao commented 3 years ago

xo_correction 2d_fix gpssim bin_creation xo_correction

Mictronics commented 3 years ago

In u-center open message view (F9), check if your receiver supports UBX-RXM-MEASX message. In case yes, check that MP is indicated low or medium for the simulated satellites. When MP is high increase the attenuation (-a option). You can also check the UBX-MON-HW message. Noise level should be as low as possible, same for CW jamming indicator. AGC somewhere in the middle.

What is your setup? Is that a direct cable connection or via antenna?

atchyuth-rao commented 3 years ago

Thanks for your reply,

Pluto SDR TX is connected to Ublox receiver with -90dbm attentuation (-50dbm as Pluto attentuation and -40 external attentuator)

I have Generated 12 satellites out of 12 I am getting atmost 5-6 only and I am not getting 3D-fix

Is there any hardaware/configurations modifications still I need to do further, I have generated GPS IQ streams from GPS-SDR-SIM with 2.5Msps sampling rate.

Please share your views for getting proper 3D fix with Pluto SDR

On Thu, Mar 18, 2021, 20:28 Mictronics @.***> wrote:

In u-center open message view (F9), check if your receiver supports UBX-RXM-MEASX message. In case yes, check that MP is indicated low or medium for the simulated satellites. When MP is high increase the attenuation (-a option). You can also check the UBX-MON-HW message. Noise level should be as low as possible, same for CW jamming indicator. AGC somewhere in the middle.

What is your setup? Is that a direct cable connection or via antenna?

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Mictronics commented 3 years ago

1 image Code: https://github.com/Mictronics/multi-sdr-gps-sim Setup PlutoSdr (with OCXO) -> 10dB attenuator -> ublox M8T Commandline: gps-sim -g-80 -f -l -12.0,-16.0,400 -e rinex2.gz -snow -v --radio=plutosdr

Ephemeris and almanac for all satellites image

atchyuth-rao commented 3 years ago

Thanks for your response.

I will try with above mentioned procedure

Only concern is for me I have done nothing regarding TCXO modification of Pluto SDR.

On Fri, Mar 19, 2021, 01:26 Mictronics @.***> wrote:

[image: 1] https://user-images.githubusercontent.com/11965780/111688031-4fe04080-882b-11eb-9986-a37e48556ebe.png [image: image] https://user-images.githubusercontent.com/11965780/111688174-671f2e00-882b-11eb-8a93-5f5e32374ce2.png Code: https://github.com/Mictronics/multi-sdr-gps-sim Setup PlutoSdr (with OCXO) -> 10dB attenuator -> ublox M8T Commandline: gps-sim -g-80 -f -l -12.0,-16.0,400 -e rinex2.gz -snow -v --radio=plutosdr

Ephemeris and almanac for all satellites [image: image] https://user-images.githubusercontent.com/11965780/111689310-28d63e80-882c-11eb-89e0-5fd07e05cded.png

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atchyuth-rao commented 3 years ago

Dear mictronics,

I have followed the procedure as you mentioned in the mail, my pluto SDR device is not recognized, please go through the below screenshots once.

gps-sim Executable_Creation: [image: image.png]

running command: [image: image.png]

TUI terminal Screenshots:

[image: image.png] [image: image.png] [image: image.png] [image: image.png]

what should i modify please let me knoww

On Fri, Mar 19, 2021 at 1:26 AM Mictronics @.***> wrote:

[image: 1] https://user-images.githubusercontent.com/11965780/111688031-4fe04080-882b-11eb-9986-a37e48556ebe.png [image: image] https://user-images.githubusercontent.com/11965780/111688174-671f2e00-882b-11eb-8a93-5f5e32374ce2.png Code: https://github.com/Mictronics/multi-sdr-gps-sim Setup PlutoSdr (with OCXO) -> 10dB attenuator -> ublox M8T Commandline: gps-sim -g-80 -f -l -12.0,-16.0,400 -e rinex2.gz -snow -v --radio=plutosdr

Ephemeris and almanac for all satellites [image: image] https://user-images.githubusercontent.com/11965780/111689310-28d63e80-882c-11eb-89e0-5fd07e05cded.png

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atchyuth-rao commented 3 years ago

small modification,

i am using this command:

gps-sim -g-80 -f -l -12.0,-16.0,400 -e rinex2.gz -snow -v --radio=plutosdr

On Sat, Mar 20, 2021 at 1:15 PM Kintada Atchyutarao < @.***> wrote:

Dear mictronics,

I have followed the procedure as you mentioned in the mail, my pluto SDR device is not recognized, please go through the below screenshots once.

gps-sim Executable_Creation: [image: image.png]

running command: [image: image.png]

TUI terminal Screenshots:

[image: image.png] [image: image.png] [image: image.png] [image: image.png]

what should i modify please let me knoww

On Fri, Mar 19, 2021 at 1:26 AM Mictronics @.***> wrote:

[image: 1] https://user-images.githubusercontent.com/11965780/111688031-4fe04080-882b-11eb-9986-a37e48556ebe.png [image: image] https://user-images.githubusercontent.com/11965780/111688174-671f2e00-882b-11eb-8a93-5f5e32374ce2.png Code: https://github.com/Mictronics/multi-sdr-gps-sim Setup PlutoSdr (with OCXO) -> 10dB attenuator -> ublox M8T Commandline: gps-sim -g-80 -f -l -12.0,-16.0,400 -e rinex2.gz -snow -v --radio=plutosdr

Ephemeris and almanac for all satellites [image: image] https://user-images.githubusercontent.com/11965780/111689310-28d63e80-882c-11eb-89e0-5fd07e05cded.png

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Mictronics commented 3 years ago

Images are not shown.

atchyuth-rao commented 3 years ago

I have attached screenshots in an earlier mail, for your reference I am sending again

On Fri, Mar 19, 2021 at 1:26 AM Mictronics @.***> wrote:

[image: 1] https://user-images.githubusercontent.com/11965780/111688031-4fe04080-882b-11eb-9986-a37e48556ebe.png [image: image] https://user-images.githubusercontent.com/11965780/111688174-671f2e00-882b-11eb-8a93-5f5e32374ce2.png Code: https://github.com/Mictronics/multi-sdr-gps-sim Setup PlutoSdr (with OCXO) -> 10dB attenuator -> ublox M8T Commandline: gps-sim -g-80 -f -l -12.0,-16.0,400 -e rinex2.gz -snow -v --radio=plutosdr

Ephemeris and almanac for all satellites [image: image] https://user-images.githubusercontent.com/11965780/111689310-28d63e80-882c-11eb-89e0-5fd07e05cded.png

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Mictronics commented 3 years ago 
gps-sim Executable_Creation:
[image: image.png]

running command:
[image: image.png]

TUI terminal Screenshots:

[image: image.png]
[image: image.png]
[image: image.png]
[image: image.png]

No images....

can you help me out faster, i have tucked with PLUTO SDR since 15-20 days

Everyone wants everything faster. Complain when you work 15-20 month on this.

atchyuth-rao commented 3 years ago

PFA,

On Sat, Mar 20, 2021, 22:40 Mictronics @.***> wrote:

gps-sim Executable_Creation: [image: image.png]

running command: [image: image.png]

TUI terminal Screenshots:

[image: image.png] [image: image.png] [image: image.png] [image: image.png]

No images....

can you help me out faster, i have tucked with PLUTO SDR since 15-20 days Everyone wants everything faster. Complain when you work 15-20 month on this.

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atchyuth-rao commented 3 years ago

hi Micronics,

have you received Images??

On Sat, Mar 20, 2021 at 10:52 PM Kintada Atchyutarao < @.***> wrote:

PFA,

On Sat, Mar 20, 2021, 22:40 Mictronics @.***> wrote:

gps-sim Executable_Creation: [image: image.png]

running command: [image: image.png]

TUI terminal Screenshots:

[image: image.png] [image: image.png] [image: image.png] [image: image.png]

No images....

can you help me out faster, i have tucked with PLUTO SDR since 15-20 days Everyone wants everything faster. Complain when you work 15-20 month on this.

— You are receiving this because you commented. Reply to this email directly, view it on GitHub https://github.com/osqzss/gps-sdr-sim/issues/225#issuecomment-803420523, or unsubscribe https://github.com/notifications/unsubscribe-auth/ATEFFY55F3THE4GIVJMEWXDTETJHZANCNFSM4J7J4FKQ .

Mictronics commented 3 years ago

Received? No. What's the problem with attaching them to this PR? Simple copy and past or upload works for me. Maybe you stop quote reply.

atchyuth-rao commented 3 years ago

No I am sending again for you...but I don't know what's happening, it's ok again I will send you

On Mon, Mar 22, 2021, 19:15 Mictronics @.***> wrote:

Received? No. What's the problem with attaching them to this PR? Simple copy and past or upload works for me. Maybe you stop quote reply.

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Mictronics commented 3 years ago

You just reply to notification Emails from Github, right? Did you check where that goes? I guess you can send your images a hundred times, they will not care. m(

atchyuth-rao commented 3 years ago

executable_creation

atchyuth-rao commented 3 years ago

![Uploading simulator_setup.png…]()

atchyuth-rao commented 3 years ago

simulation_status

atchyuth-rao commented 3 years ago

![Uploading running_command.png…]()

Mictronics commented 3 years ago

It seems this is way over your head. Try a more simple project... You compiled the code without PlutoSDR support. The README says:

With ADLAM-PLUTO support: make all PLUTOSDR=yes (depends on libiio and libad9361-iio)

You need to build and install library dependencies before if not already done.

atchyuth-rao commented 3 years ago

Yes I already run that command, but my Pluto SDR is not connected

On Mon, Mar 22, 2021, 22:11 Mictronics @.***> wrote:

It seems this is way over your head. Try a more simple project... You compiled the code without PlutoSDR support. The README says:

With ADLAM-PLUTO support: make all PLUTOSDR=yes (depends on libiio and libad9361-iio)

You need to build and install library dependencies before if not already done.

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atchyuth-rao commented 3 years ago

hi mictronics, i am getting position fix, i have uninstalled all librararies and follow your Multi-SDR-GPS-SIM i am getting 3D position fix but i have a 3 things to discuss with you 3D-fix

atchyuth-rao commented 3 years ago

Things which i need to understand deeper and need to be resolved

  1. Rinex2 file pulling error issue rinex_pulling

when i run the gps-sim -g-80 -f -l -12.0,-16.0,400 -e rinex2.gz -snow -v --radio=plutosdr some times rinex pulling error came.

2.Once 3D-Fix came it is stable, but one concern is when i stop IQ streaming(after 3D fix) and again when i am running the command i am not getting 3D-Fix.

3.when i added different coordinates in running command i am not getting 3D fix even once,but some times all satellite C/N ratios are stable(satellite bars are blue always in ublox receiver). ![Uploading UBX-RXM-Message.PNG…]()

atchyuth-rao commented 3 years ago

![Uploading UBX-RXM-Message.PNG…]()

Mictronics commented 3 years ago

1) Unless you specify a specific station with --station, the -f command uses a random station while pulling the Rinex file. However, not all stations provide such file for the actual hour. Depends on time zone, local time etc. Stations are listed in gps.c.

2) & 3) Getting a 3D fix with new coordinates takes more time when the receiver already knows the almanac and has seen a fix. Be patient and wait a significant time or cold start your GPS receiver.

atchyuth-rao commented 3 years ago

1.I haven't changed any TCXO modification of my Pluto I think that is the one thing which I need to modify.

  1. I want to repeat the same experiment with the dynamic coordinates(i.e.i want to simulate particular trajectory (path)).

For the above thing how should I Generate dynamic coordinates and how can I apply this coordinates to multi-sdr-gps-sim application

atchyuth-rao commented 3 years ago

hi Micronics,

I am getting position fix with user motion file(user motion file is created with the help of satgen free software) but I have two things I need inputs from you

1.When we test with user motion the max duration is 300sec, can we increase this to max extend like for Static coordinates we can run up to 86400 sec, give me some inputs i will try. 2.I want test mutli-sdr-gps-sim on mobile phones,

I have generated GPS Signal with the help of Pluto SDR Tx connected with antenna and Trnamitted into free space,I turned ON my mobile phone location, I am getting fix with U-blox Receiver but my mobile cant changes its position.

Mictronics commented 3 years ago

Simulation works for me with and dynamic on Samsung Galaxy S2 Tab and Motorola G6. However time to first fix depends on what position the device has seen before, relative to simulated coordinates.

atchyuth-rao commented 3 years ago

Thanks man for your response

Forget about 3-D fix my mobile didn't get any Satellies(atleast PRN code-- blue colour bars), I have connected one antenna(came with PLUTO) to Pluto SDR and Generated GPS signal, in my phone I have disabled sim card.

And one more thing can we simulate user motion more than 5 minutes, with present alogorithm we can simulate max 5 min(for user motion)

On Tue, Mar 30, 2021, 21:47 Mictronics @.***> wrote:

Simulation works for me with and dynamic on Samsung Galaxy S2 Tab and Motorola G6. However time to first fix depends on what position the device has seen before, relative to simulated coordinates.

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Mictronics commented 3 years ago

I don't know why you spam open PR's with your questions but to answer you last one: Yes the user motion can be extended, length is defined by USER_MOTION_SIZE.

atchyuth-rao commented 3 years ago

I am getting output for user motion with more than 5 minutes.

1.i have only one pending work that is need to get mobile fix with Mobile phones.

I will try and let you know.

On Wed, Mar 31, 2021, 18:25 Mictronics @.***> wrote:

I don't know why you spam open PR's with your questions but to answer you last one: Yes the user motion can be extended, length is defined by USER_MOTION_SIZE.

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atchyuth-rao commented 3 years ago

hi mictronics,

i am getting following error while running the simulation commands

"invalid time of alamanac"

1620736708545 1620736708228

"exit gps thread"

Mictronics commented 3 years ago

Your almanac is outdated. Older than 4 weeks?

atchyuth-rao commented 3 years ago

I have tested with today brdc file from naasa website

On Tue, May 11, 2021, 19:56 Mictronics @.***> wrote:

Your almanac is outdated. Older than 4 weeks?

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Mictronics commented 3 years ago

Can you provide me the file?

atchyuth-rao commented 3 years ago

brdc1320.21n.gz