osqzss / bladegps Goto Github PK

Thanks for your gpr-sdr-sim!
bladeRF 2.0 micro xA4 ,when using gps-sdr-sim to generate data (https://github.com/osqzss/gps-sdr-sim ,or https://github.com/osqzss/bladeGPS),send data by bladeRF-cli or bladeGPS, the parameter of bladeRF -cli is :
set frequency tx 1575.42M
set frequency rx 1573.42M
set samplerate 2.6M
set bandwidth 2.5M
set txvga1 -25
cal lms
cal dc tx
tx config file=gpssim.bin format=bin
tx start
tx wait

when the bladeRF -cli starting, Program display:" Error (bladerf.script:4): Invalid operation or parameter".May I ask what is the cause?

I was reading this issue Nuand/bladeRF#414 and I was wondering if bladeGPS is able to use a 1PPS or 10MHz inputs (1.8V) via J71-1 for better accuracy. If so, had you been using a device to do this? I am new to this world, so maybe this isn't even applicable here.

I have tried the interactive mode and that works well. Seems to loop the same location unless you move using the keyboard. If I were to use a dynamic mode file, would it be simple to add a pause function that would loop cause the application to pause the file and loop my current location?

I'm still learning about the bladerf, so I apologize for the potential newbie question. :-)

I assume that the rinex file is loaded only once when the command starts the application. If I were updating the rinex file with a newer file version, but kept the same name while the application is running, triggering a reload of the file, could that be a simpler way to generate closer to real-time date/time information?

Hi,

I am working with v0.1 of bladeGPS rather than v0.2 because of #13.

I have edited the brdc (it was originally from 2016-05-31) to have today's date in it (2016-07-26). I am running with the following command line:

./bladegps -e dave.16n -l 30.286502,120.032669,100 -t 2016/07/26,01:00:00

I would expect the GPS date to be 2016-07-26.

But instead I am receiving 2016-05-31 as the date when viewed in cgps (part of the GPSd library). Though the time aspect matches the command line.

Please see the following screenshot:

• On the left is the brdc file.
• Top right is the bladegps script running.
• The bottom right is the output of cgps

gpssim.c uses conio.h, which from my googling is Windows only. When you run make on linux you get the following error:

user@ubuntu:~/bladeGPS$ make
gcc -O3 -Wall -I../bladeRF/host/libraries/libbladeRF/include   -c -o gpssim.o gpssim.c
gpssim.c:19:19: fatal error: conio.h: No such file or directory
compilation terminated.
<builtin>: recipe for target 'gpssim.o' failed
make: *** [gpssim.o] Error 1

Hi,

I was trying to use the almanac option to hopefully get better simulation results for future dates, in the limits of the almanac of course, but I received an error with the almanac file from here and the rinex from here. When reading through the internet I found out that this may be related to the week rollover that happened last weekend.
The error I get is:
ERROR: Invalid time of almanac.
1028
2052
Abort.
(Where the two numbers are something I added in to find out what time it reads - first number: time of the almanac (gps week number); second number: time of ephemeris file (gps week number))

Would this issue be solved by adding another 1024 to the coefficient in gpssim.c line 1041 ? Or would it be worth putting this into a constant for easier finding?

Thanks

Max

Hi @osqzss - thanks so much for building this! With a few small tweaks it seems to work great on Ubuntu 16.04.

A quick question for you: Is there a particular reason for the 86400 second (24 hour) limit? Would there be any problems with running this without a time limit?

Hello

I'm trying to use this simulator in real time with bladeRF but I'm having some problems ..
I've done the "Building libbladeRF for Windows" step by step and I managed to do so.
Now I've done the "Build on Windows with Visual Studio" of the bladeGPS simulator step by step and I also managed to do it, but now I run the executable and I get the error "Failed to set TX frequency: Invalid operation or parameter".
Can you explain what the problem might be?

HI, All
I was trying to run bladegps on a Bladerf micro xA4. But bladegps.c complains about bladerf_channel is undefined.

The code line is: bladerf_channel tx_channel = BLADERF_CHANNEL_TX(0);

Any help would be appreciated.

Dear,
Thank you for sharing your code. Could you help me? When I run 'make' of this source code on Ubuntu 20.04, 'Make: nothing to be done for 'all' is shown. I tried many times but I can run on Ubuntu. Please help me! Thanks so much!

I have a project I am working on I generate positions on Microcontroller and need to convert these digital data into RF data as the transmitted from GPS because my other device only gets GPS data in form of RF as it contains internal GPS receiver. So I want to know is it possible using your library to generate GPS that is changeable in real time using bladeRF?
Thanks in advance.

I have a crude antenna built, but I believe the signal is pretty messy. Any suggestions on a proper antenna to buy?

I used a user motion file to try and move the location. The first location in the user motion file is the only one that is used and it doesn't move around to the other locations in the file.

Hi,

I have a bladeRF A5 that can TX a GPS location that my GPS receiver can lock on to, but the issue is that the signal will periodically turn off for a few minutes, then turn back on. This does not happen on a bladeRF A4.

Ubuntu 20.04
Latest A5 firmware

Are there any plans to support hackrf devices?

I've been using Mictronics multi-sdr-sim(https://github.com/Mictronics/multi-sdr-gps-sim) but his version does not work with all GPS receivers. Some receivers have a very difficult time getting a fix and the fix is very unstable, while with your version they have a good fix within a minute.

Hi!
I was able to build the gps-sdr-sim using Visual Studio, but I'm struggling to get this to build. I must be missing a small step. Any additional instructions would be very much appreciated, thanks!